[1] Longitudinal waves and Transverse waves are types of -
A.
Mechanical waves
B.
Non-Mechanical waves
C.
Both of above
D.
None of Above
Ans:
Mechanical waves
Explanation :
Mechanical Waves are waves which propagate through a material medium (solid, liquid, or gas) at a wave speed which depends on the elastic and inertial properties of that medium.
[2] Due to rusting the weight of iron -
A.
Decreases
B.
Increases
C.
Remains the same
D.
Uncertain
Ans:
Increases
Explanation :
Corrosion of a block of metal - Iron to Iron Oxide (rust), Aluminum to Bauxite, Cooper to Cupric-oxide, or otherwise - does not change the weight of the metal in the system.
[3] Water will not be vaporized if –
A.
the temperature is 0°C
B.
the humidity is 0%
C.
the humidity is 100%
D.
the temperature is 100°C
Ans:
the humidity is 100%
Explanation :
If the relative humidity is 100 percent, water will not evaporate as the air is already saturated with moisture. When relative humidity approaches 100 percent, condensation can occur. The lower the relative humidity, the easier it is for moisture to evaporate.
[4] Which of the following is not a part of a CRT?
A.
Phosphor screen
B.
Shadow mask
C.
Electron gun
D.
Gas plasma
Ans:
Gas plasma
Explanation :
The cathode ray tube (CRT) is a vacuum tube containing an electron gun (a source of electrons or electron emitter) and a fluorescent screen used to view images. Colour tubes use three different phosphors which emit red, green, and blue light respectively. They are packed together in stripes (as in aperture grille designs) or clusters called "triads" (as in shadow mask CRTs).
[5] Decibel is a term connected with :
A.
air
B.
water
C.
sound
D.
soil
Ans:
sound
Explanation :
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in, decibels is ten times the logarithm to base 10 of the ratio of two power quantities.
[6] As we go from Equator to North pole the value of `g’, the acceleration due to gravity –
A.
remains the same
B.
decreases
C.
increases
D.
None of the above
Ans:
increases
Explanation :
The acceleration due to gravity of earth is the rate of increase of velocity of a body falling freely towards the earth. At a given place, the value of acceleration due to gravity is constant but it varies from one place to another place on the earth surface. It is due to this fact that earth is not a perfect sphere. It is flattened at the poles and bulges out at the equator. The value of 'g' is minimum at the equator and maximum at the poles.
[7] The best conductor of electricity among the following is :
A.
Copper
B.
Iron
C.
Aluminium
D.
Silver
Ans:
Silver
Explanation :
Copper: 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[8] Flight Recorder is technically called :
A.
Dark box
B.
Blind box
C.
Black box
D.
Altitude meter
Ans:
Black box
Explanation :
A flight data recorder (FDR) is an electronic device employed to record any instructions sent to any electronic systems on an aircraft. Another kind of flight recorder is the cockpit voice recorder which records conversation in the cockpit, radio Communications between the cockpit crew and others (including conversation with air traffic control personnel), as well as ambient sounds.
[9] The part of the eye having the largest refractive index is -
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
Like a camera, the human eye uses a convex lens system to form a small, inverted, real image of an object in front of it. Lens is the part of the eye having the largest refractive index.
[10] The centre of gravity of a sprinter during the race lies –
A.
Ahead of his feet
B.
Behind his feet
C.
At the centre of the body
D.
To the left side of the body
Ans:
Ahead of his feet
Explanation :
Running is a means of terrestrial locomotion allowing humans and other animals to move rapidly on foot. It is simply defined in athletics terms as a gait in which at regular points during the running cycle both feel are off the ground. This is in contrast to walking, where one foot is always in contact with the ground, the legs are kept mostly straight and the center of gravity vaults over the legs in an inverted pendulum fashion.
[11] Which of the following liquids has the least density?
A.
Fresh water
B.
Salt water
C.
Petrol
D.
Mercury
Ans:
Petrol
Explanation :
Gasoline or petrol is a transparent, petroleum-derived liquid that is used primarily as a fuel in internal Combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives.
[12] The hair of shaving brush clings together when removed from water due to –
A.
Surface tension
B.
Viscosity
C.
Elasticity
D.
Friction
Ans:
Surface tension
Explanation :
Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. It is revealed, for example, in the floating of some objects on the surface of water, even though they are denser than water, and in the ability of some insects (e.g. water striders) to run on the water surface. This property is caused by cohesion of similar molecules, and is responsible for many of the behaviors of liquids.
[13] If a current of 1.5 A is maintained in a resistor of 10 2, then the energy dissipated in the resistor in 1 minute will be :
A.
15 W
B.
22.5 W
C.
135 W
D.
1350 W
Ans:
1350 W
Explanation :
The potential difference or voltage, V, across two points is defined as the energy, E dissipated or transferred by a coulomb of charge 9, that moves through two points.
[14] Submerged objects can be located using –
A.
Radar
B.
Sonar
C.
Quasar
D.
Pulsar
Ans:
Sonar
Explanation :
Sonar (originally an acronym for Sound Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.
[15] A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will -
A.
Increase
B.
decrease
C.
remain unaffected
D.
have its shape changed
Ans:
Increase
Explanation :
The metal ball can be considered to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e, the volume of the hollow portion will also increase.
[16] Where are mesons found?
A.
Cosmic rays
B.
X-rays
C.
Gamma rays
D.
Laser beam
Ans:
Cosmic rays
Explanation :
Mesons are not produced by radioactive decay, but appear in nature only as short-lived products of very high-energy interactions in matter, between particles made of quarks. In cosmic ray interactions, for example, suchparticles are ordinary protons and neutrons. Mesons are hadronic subatomic particles composed of one quark and one anti-quark, bound together by the strong interaction.
[17] A larger force on a rotating body results in larger _.
A.
Mass
B.
Torque
C.
Axis of rotation
D.
Centre of mass
Ans:
Axis of rotation
Explanation :
[18] Which of the following is used in oven?
A.
X-rays
B.
UV rays
C.
Microwaves
D.
Radiowaves
Ans:
Microwaves
Explanation :
An oven that uses micro radiation waves as a source of heat in order to cook food as opposed to a fire source. Conceptualized in 1946, Dr. Perry Spencer allegedly discovered the heating properties of microwaves while studying the magnetron. A microwave oven, often colloquially shortened to microwave, is a kitchen appliance that heats food by dielectric heating accomplished with radiation used to heat polarized molecules in food.
[19] The instrument used to see the distant objects on the Earth is –
A.
Terrestrial telescope
B.
Astronomical telescope
C.
Compound microscope
D.
Simple microscope
Ans:
Terrestrial telescope
Explanation :
A telescope assists the eye chiefly in two way by enlarging the visual angle under which a distant object is seen, and thus magnifying that object; and. secondly, by collecting, and conveying to the eye, a larger beam of light than would enter the naked organ, thus rendering objects distinct and visible which would otherwise be indistinct and or invisible.
[20] Which of the following principle is used to produce low-temperatures'?
A.
Super conductivity
B.
Joule-Kelvin effect
C.
Thermo-electric effect
D.
Adiabatic demagnetization
Ans:
Adiabatic demagnetization
Explanation :
Magnetic refrigeration is a cooling technology based on the magneto-caloiic effect. This technique can be used to attain extremely low temperatures, as well as the ranges used in common refrigerators, depending on the design of the system. The magneto-caloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a change in temperature of a suitable material is caused by exposing the material to a changing magnetic field.
[21] A current carrying conductor is associated with –
A.
a magnetic field
B.
an electric field
C.
an electro-magnetic field
D.
an electrostatic field
Ans:
an electro-magnetic field
Explanation :
A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles.
[22] The weakest of all fundamental forces is –
A.
Gravitational force
B.
Electrostatic force
C.
Magnetic force
D.
Nuclear force
Ans:
Gravitational force
Explanation :
In particle physics, fundamental interactions (sometimes called interactive forces or fundamental forces) are the ways that elementary particles interact with one another. An interaction is fundamental when it cannot be described in terms of other interactions. The four known fundamental interactions are electromagnetism, strong interaction ("strong nuclear force"), weak interaction ("weak nuclear force"), and gravitation. All are non-contact forces.
[23] Which of the following instruments is used to measure humidity?
A.
Kata Thermometer
B.
Anemometer
C.
Sling Psychrometer
D.
Clinical Thermometer
Ans:
Sling Psychrometer
Explanation :
A psychrometer consists of two thermometers, one which is dry and one which is kept moist with distilled water on a sock or wick. The two thermometers are thus called the dry-bulb and the wet-bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. The sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes, is sometimes used for field measurements, but is being replaced by more convenient electronic sensors.
[24] A micron is equal to –
A.
0.1 ram
B.
0.01 mm
C.
0.001 mm
D.
0.0001 mm
Ans:
0.001 mm
Explanation :
1 micron = 0.001 millimeters. A micrometre (micron) is one-millionth of a metre (or one-thousandth of a millimetre, 0.001 mm). Its unit symbol in the International System of Units (SI) is µm. It is a common unit of measurement for wavelengths of infrared radiation as well as sizes of cells and bacteria.
[25] Persons suffering from myopia are advised to use –
A.
convex lens
B.
concave lens
C.
piano-convex lens
D.
plano-concave lens
Ans:
concave lens
Explanation :
A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.
Explanation :
Mechanical Waves are waves which propagate through a material medium (solid, liquid, or gas) at a wave speed which depends on the elastic and inertial properties of that medium.
[2] Due to rusting the weight of iron -
A.
Decreases
B.
Increases
C.
Remains the same
D.
Uncertain
Ans:
Increases
Explanation :
Corrosion of a block of metal - Iron to Iron Oxide (rust), Aluminum to Bauxite, Cooper to Cupric-oxide, or otherwise - does not change the weight of the metal in the system.
[3] Water will not be vaporized if –
A.
the temperature is 0°C
B.
the humidity is 0%
C.
the humidity is 100%
D.
the temperature is 100°C
Ans:
the humidity is 100%
Explanation :
If the relative humidity is 100 percent, water will not evaporate as the air is already saturated with moisture. When relative humidity approaches 100 percent, condensation can occur. The lower the relative humidity, the easier it is for moisture to evaporate.
[4] Which of the following is not a part of a CRT?
A.
Phosphor screen
B.
Shadow mask
C.
Electron gun
D.
Gas plasma
Ans:
Gas plasma
Explanation :
The cathode ray tube (CRT) is a vacuum tube containing an electron gun (a source of electrons or electron emitter) and a fluorescent screen used to view images. Colour tubes use three different phosphors which emit red, green, and blue light respectively. They are packed together in stripes (as in aperture grille designs) or clusters called "triads" (as in shadow mask CRTs).
[5] Decibel is a term connected with :
A.
air
B.
water
C.
sound
D.
soil
Ans:
sound
Explanation :
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in, decibels is ten times the logarithm to base 10 of the ratio of two power quantities.
[6] As we go from Equator to North pole the value of `g’, the acceleration due to gravity –
A.
remains the same
B.
decreases
C.
increases
D.
None of the above
Ans:
increases
Explanation :
The acceleration due to gravity of earth is the rate of increase of velocity of a body falling freely towards the earth. At a given place, the value of acceleration due to gravity is constant but it varies from one place to another place on the earth surface. It is due to this fact that earth is not a perfect sphere. It is flattened at the poles and bulges out at the equator. The value of 'g' is minimum at the equator and maximum at the poles.
[7] The best conductor of electricity among the following is :
A.
Copper
B.
Iron
C.
Aluminium
D.
Silver
Ans:
Silver
Explanation :
Copper: 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[8] Flight Recorder is technically called :
A.
Dark box
B.
Blind box
C.
Black box
D.
Altitude meter
Ans:
Black box
Explanation :
A flight data recorder (FDR) is an electronic device employed to record any instructions sent to any electronic systems on an aircraft. Another kind of flight recorder is the cockpit voice recorder which records conversation in the cockpit, radio Communications between the cockpit crew and others (including conversation with air traffic control personnel), as well as ambient sounds.
[9] The part of the eye having the largest refractive index is -
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
Like a camera, the human eye uses a convex lens system to form a small, inverted, real image of an object in front of it. Lens is the part of the eye having the largest refractive index.
[10] The centre of gravity of a sprinter during the race lies –
A.
Ahead of his feet
B.
Behind his feet
C.
At the centre of the body
D.
To the left side of the body
Ans:
Ahead of his feet
Explanation :
Running is a means of terrestrial locomotion allowing humans and other animals to move rapidly on foot. It is simply defined in athletics terms as a gait in which at regular points during the running cycle both feel are off the ground. This is in contrast to walking, where one foot is always in contact with the ground, the legs are kept mostly straight and the center of gravity vaults over the legs in an inverted pendulum fashion.
[11] Which of the following liquids has the least density?
A.
Fresh water
B.
Salt water
C.
Petrol
D.
Mercury
Ans:
Petrol
Explanation :
Gasoline or petrol is a transparent, petroleum-derived liquid that is used primarily as a fuel in internal Combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives.
[12] The hair of shaving brush clings together when removed from water due to –
A.
Surface tension
B.
Viscosity
C.
Elasticity
D.
Friction
Ans:
Surface tension
Explanation :
Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. It is revealed, for example, in the floating of some objects on the surface of water, even though they are denser than water, and in the ability of some insects (e.g. water striders) to run on the water surface. This property is caused by cohesion of similar molecules, and is responsible for many of the behaviors of liquids.
[13] If a current of 1.5 A is maintained in a resistor of 10 2, then the energy dissipated in the resistor in 1 minute will be :
A.
15 W
B.
22.5 W
C.
135 W
D.
1350 W
Ans:
1350 W
Explanation :
The potential difference or voltage, V, across two points is defined as the energy, E dissipated or transferred by a coulomb of charge 9, that moves through two points.
[14] Submerged objects can be located using –
A.
Radar
B.
Sonar
C.
Quasar
D.
Pulsar
Ans:
Sonar
Explanation :
Sonar (originally an acronym for Sound Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.
[15] A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will -
A.
Increase
B.
decrease
C.
remain unaffected
D.
have its shape changed
Ans:
Increase
Explanation :
The metal ball can be considered to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e, the volume of the hollow portion will also increase.
[16] Where are mesons found?
A.
Cosmic rays
B.
X-rays
C.
Gamma rays
D.
Laser beam
Ans:
Cosmic rays
Explanation :
Mesons are not produced by radioactive decay, but appear in nature only as short-lived products of very high-energy interactions in matter, between particles made of quarks. In cosmic ray interactions, for example, suchparticles are ordinary protons and neutrons. Mesons are hadronic subatomic particles composed of one quark and one anti-quark, bound together by the strong interaction.
[17] A larger force on a rotating body results in larger _.
A.
Mass
B.
Torque
C.
Axis of rotation
D.
Centre of mass
Ans:
Axis of rotation
Explanation :
[18] Which of the following is used in oven?
A.
X-rays
B.
UV rays
C.
Microwaves
D.
Radiowaves
Ans:
Microwaves
Explanation :
An oven that uses micro radiation waves as a source of heat in order to cook food as opposed to a fire source. Conceptualized in 1946, Dr. Perry Spencer allegedly discovered the heating properties of microwaves while studying the magnetron. A microwave oven, often colloquially shortened to microwave, is a kitchen appliance that heats food by dielectric heating accomplished with radiation used to heat polarized molecules in food.
[19] The instrument used to see the distant objects on the Earth is –
A.
Terrestrial telescope
B.
Astronomical telescope
C.
Compound microscope
D.
Simple microscope
Ans:
Terrestrial telescope
Explanation :
A telescope assists the eye chiefly in two way by enlarging the visual angle under which a distant object is seen, and thus magnifying that object; and. secondly, by collecting, and conveying to the eye, a larger beam of light than would enter the naked organ, thus rendering objects distinct and visible which would otherwise be indistinct and or invisible.
[20] Which of the following principle is used to produce low-temperatures'?
A.
Super conductivity
B.
Joule-Kelvin effect
C.
Thermo-electric effect
D.
Adiabatic demagnetization
Ans:
Adiabatic demagnetization
Explanation :
Magnetic refrigeration is a cooling technology based on the magneto-caloiic effect. This technique can be used to attain extremely low temperatures, as well as the ranges used in common refrigerators, depending on the design of the system. The magneto-caloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a change in temperature of a suitable material is caused by exposing the material to a changing magnetic field.
[21] A current carrying conductor is associated with –
A.
a magnetic field
B.
an electric field
C.
an electro-magnetic field
D.
an electrostatic field
Ans:
an electro-magnetic field
Explanation :
A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles.
[22] The weakest of all fundamental forces is –
A.
Gravitational force
B.
Electrostatic force
C.
Magnetic force
D.
Nuclear force
Ans:
Gravitational force
Explanation :
In particle physics, fundamental interactions (sometimes called interactive forces or fundamental forces) are the ways that elementary particles interact with one another. An interaction is fundamental when it cannot be described in terms of other interactions. The four known fundamental interactions are electromagnetism, strong interaction ("strong nuclear force"), weak interaction ("weak nuclear force"), and gravitation. All are non-contact forces.
[23] Which of the following instruments is used to measure humidity?
A.
Kata Thermometer
B.
Anemometer
C.
Sling Psychrometer
D.
Clinical Thermometer
Ans:
Sling Psychrometer
Explanation :
A psychrometer consists of two thermometers, one which is dry and one which is kept moist with distilled water on a sock or wick. The two thermometers are thus called the dry-bulb and the wet-bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. The sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes, is sometimes used for field measurements, but is being replaced by more convenient electronic sensors.
[24] A micron is equal to –
A.
0.1 ram
B.
0.01 mm
C.
0.001 mm
D.
0.0001 mm
Ans:
0.001 mm
Explanation :
1 micron = 0.001 millimeters. A micrometre (micron) is one-millionth of a metre (or one-thousandth of a millimetre, 0.001 mm). Its unit symbol in the International System of Units (SI) is µm. It is a common unit of measurement for wavelengths of infrared radiation as well as sizes of cells and bacteria.
[25] Persons suffering from myopia are advised to use –
A.
convex lens
B.
concave lens
C.
piano-convex lens
D.
plano-concave lens
Ans:
concave lens
Explanation :
A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.
Explanation :
If the relative humidity is 100 percent, water will not evaporate as the air is already saturated with moisture. When relative humidity approaches 100 percent, condensation can occur. The lower the relative humidity, the easier it is for moisture to evaporate.
[4] Which of the following is not a part of a CRT?
A.
Phosphor screen
B.
Shadow mask
C.
Electron gun
D.
Gas plasma
Ans:
Gas plasma
Explanation :
The cathode ray tube (CRT) is a vacuum tube containing an electron gun (a source of electrons or electron emitter) and a fluorescent screen used to view images. Colour tubes use three different phosphors which emit red, green, and blue light respectively. They are packed together in stripes (as in aperture grille designs) or clusters called "triads" (as in shadow mask CRTs).
[5] Decibel is a term connected with :
A.
air
B.
water
C.
sound
D.
soil
Ans:
sound
Explanation :
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in, decibels is ten times the logarithm to base 10 of the ratio of two power quantities.
[6] As we go from Equator to North pole the value of `g’, the acceleration due to gravity –
A.
remains the same
B.
decreases
C.
increases
D.
None of the above
Ans:
increases
Explanation :
The acceleration due to gravity of earth is the rate of increase of velocity of a body falling freely towards the earth. At a given place, the value of acceleration due to gravity is constant but it varies from one place to another place on the earth surface. It is due to this fact that earth is not a perfect sphere. It is flattened at the poles and bulges out at the equator. The value of 'g' is minimum at the equator and maximum at the poles.
[7] The best conductor of electricity among the following is :
A.
Copper
B.
Iron
C.
Aluminium
D.
Silver
Ans:
Silver
Explanation :
Copper: 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[8] Flight Recorder is technically called :
A.
Dark box
B.
Blind box
C.
Black box
D.
Altitude meter
Ans:
Black box
Explanation :
A flight data recorder (FDR) is an electronic device employed to record any instructions sent to any electronic systems on an aircraft. Another kind of flight recorder is the cockpit voice recorder which records conversation in the cockpit, radio Communications between the cockpit crew and others (including conversation with air traffic control personnel), as well as ambient sounds.
[9] The part of the eye having the largest refractive index is -
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
Like a camera, the human eye uses a convex lens system to form a small, inverted, real image of an object in front of it. Lens is the part of the eye having the largest refractive index.
[10] The centre of gravity of a sprinter during the race lies –
A.
Ahead of his feet
B.
Behind his feet
C.
At the centre of the body
D.
To the left side of the body
Ans:
Ahead of his feet
Explanation :
Running is a means of terrestrial locomotion allowing humans and other animals to move rapidly on foot. It is simply defined in athletics terms as a gait in which at regular points during the running cycle both feel are off the ground. This is in contrast to walking, where one foot is always in contact with the ground, the legs are kept mostly straight and the center of gravity vaults over the legs in an inverted pendulum fashion.
[11] Which of the following liquids has the least density?
A.
Fresh water
B.
Salt water
C.
Petrol
D.
Mercury
Ans:
Petrol
Explanation :
Gasoline or petrol is a transparent, petroleum-derived liquid that is used primarily as a fuel in internal Combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives.
[12] The hair of shaving brush clings together when removed from water due to –
A.
Surface tension
B.
Viscosity
C.
Elasticity
D.
Friction
Ans:
Surface tension
Explanation :
Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. It is revealed, for example, in the floating of some objects on the surface of water, even though they are denser than water, and in the ability of some insects (e.g. water striders) to run on the water surface. This property is caused by cohesion of similar molecules, and is responsible for many of the behaviors of liquids.
[13] If a current of 1.5 A is maintained in a resistor of 10 2, then the energy dissipated in the resistor in 1 minute will be :
A.
15 W
B.
22.5 W
C.
135 W
D.
1350 W
Ans:
1350 W
Explanation :
The potential difference or voltage, V, across two points is defined as the energy, E dissipated or transferred by a coulomb of charge 9, that moves through two points.
[14] Submerged objects can be located using –
A.
Radar
B.
Sonar
C.
Quasar
D.
Pulsar
Ans:
Sonar
Explanation :
Sonar (originally an acronym for Sound Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.
[15] A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will -
A.
Increase
B.
decrease
C.
remain unaffected
D.
have its shape changed
Ans:
Increase
Explanation :
The metal ball can be considered to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e, the volume of the hollow portion will also increase.
[16] Where are mesons found?
A.
Cosmic rays
B.
X-rays
C.
Gamma rays
D.
Laser beam
Ans:
Cosmic rays
Explanation :
Mesons are not produced by radioactive decay, but appear in nature only as short-lived products of very high-energy interactions in matter, between particles made of quarks. In cosmic ray interactions, for example, suchparticles are ordinary protons and neutrons. Mesons are hadronic subatomic particles composed of one quark and one anti-quark, bound together by the strong interaction.
[17] A larger force on a rotating body results in larger _.
A.
Mass
B.
Torque
C.
Axis of rotation
D.
Centre of mass
Ans:
Axis of rotation
Explanation :
[18] Which of the following is used in oven?
A.
X-rays
B.
UV rays
C.
Microwaves
D.
Radiowaves
Ans:
Microwaves
Explanation :
An oven that uses micro radiation waves as a source of heat in order to cook food as opposed to a fire source. Conceptualized in 1946, Dr. Perry Spencer allegedly discovered the heating properties of microwaves while studying the magnetron. A microwave oven, often colloquially shortened to microwave, is a kitchen appliance that heats food by dielectric heating accomplished with radiation used to heat polarized molecules in food.
[19] The instrument used to see the distant objects on the Earth is –
A.
Terrestrial telescope
B.
Astronomical telescope
C.
Compound microscope
D.
Simple microscope
Ans:
Terrestrial telescope
Explanation :
A telescope assists the eye chiefly in two way by enlarging the visual angle under which a distant object is seen, and thus magnifying that object; and. secondly, by collecting, and conveying to the eye, a larger beam of light than would enter the naked organ, thus rendering objects distinct and visible which would otherwise be indistinct and or invisible.
[20] Which of the following principle is used to produce low-temperatures'?
A.
Super conductivity
B.
Joule-Kelvin effect
C.
Thermo-electric effect
D.
Adiabatic demagnetization
Ans:
Adiabatic demagnetization
Explanation :
Magnetic refrigeration is a cooling technology based on the magneto-caloiic effect. This technique can be used to attain extremely low temperatures, as well as the ranges used in common refrigerators, depending on the design of the system. The magneto-caloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a change in temperature of a suitable material is caused by exposing the material to a changing magnetic field.
[21] A current carrying conductor is associated with –
A.
a magnetic field
B.
an electric field
C.
an electro-magnetic field
D.
an electrostatic field
Ans:
an electro-magnetic field
Explanation :
A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles.
[22] The weakest of all fundamental forces is –
A.
Gravitational force
B.
Electrostatic force
C.
Magnetic force
D.
Nuclear force
Ans:
Gravitational force
Explanation :
In particle physics, fundamental interactions (sometimes called interactive forces or fundamental forces) are the ways that elementary particles interact with one another. An interaction is fundamental when it cannot be described in terms of other interactions. The four known fundamental interactions are electromagnetism, strong interaction ("strong nuclear force"), weak interaction ("weak nuclear force"), and gravitation. All are non-contact forces.
[23] Which of the following instruments is used to measure humidity?
A.
Kata Thermometer
B.
Anemometer
C.
Sling Psychrometer
D.
Clinical Thermometer
Ans:
Sling Psychrometer
Explanation :
A psychrometer consists of two thermometers, one which is dry and one which is kept moist with distilled water on a sock or wick. The two thermometers are thus called the dry-bulb and the wet-bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. The sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes, is sometimes used for field measurements, but is being replaced by more convenient electronic sensors.
[24] A micron is equal to –
A.
0.1 ram
B.
0.01 mm
C.
0.001 mm
D.
0.0001 mm
Ans:
0.001 mm
Explanation :
1 micron = 0.001 millimeters. A micrometre (micron) is one-millionth of a metre (or one-thousandth of a millimetre, 0.001 mm). Its unit symbol in the International System of Units (SI) is µm. It is a common unit of measurement for wavelengths of infrared radiation as well as sizes of cells and bacteria.
[25] Persons suffering from myopia are advised to use –
A.
convex lens
B.
concave lens
C.
piano-convex lens
D.
plano-concave lens
Ans:
concave lens
Explanation :
A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.
Explanation :
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in, decibels is ten times the logarithm to base 10 of the ratio of two power quantities.
[6] As we go from Equator to North pole the value of `g’, the acceleration due to gravity –
A.
remains the same
B.
decreases
C.
increases
D.
None of the above
Ans:
increases
Explanation :
The acceleration due to gravity of earth is the rate of increase of velocity of a body falling freely towards the earth. At a given place, the value of acceleration due to gravity is constant but it varies from one place to another place on the earth surface. It is due to this fact that earth is not a perfect sphere. It is flattened at the poles and bulges out at the equator. The value of 'g' is minimum at the equator and maximum at the poles.
[7] The best conductor of electricity among the following is :
A.
Copper
B.
Iron
C.
Aluminium
D.
Silver
Ans:
Silver
Explanation :
Copper: 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[8] Flight Recorder is technically called :
A.
Dark box
B.
Blind box
C.
Black box
D.
Altitude meter
Ans:
Black box
Explanation :
A flight data recorder (FDR) is an electronic device employed to record any instructions sent to any electronic systems on an aircraft. Another kind of flight recorder is the cockpit voice recorder which records conversation in the cockpit, radio Communications between the cockpit crew and others (including conversation with air traffic control personnel), as well as ambient sounds.
[9] The part of the eye having the largest refractive index is -
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
Like a camera, the human eye uses a convex lens system to form a small, inverted, real image of an object in front of it. Lens is the part of the eye having the largest refractive index.
[10] The centre of gravity of a sprinter during the race lies –
A.
Ahead of his feet
B.
Behind his feet
C.
At the centre of the body
D.
To the left side of the body
Ans:
Ahead of his feet
Explanation :
Running is a means of terrestrial locomotion allowing humans and other animals to move rapidly on foot. It is simply defined in athletics terms as a gait in which at regular points during the running cycle both feel are off the ground. This is in contrast to walking, where one foot is always in contact with the ground, the legs are kept mostly straight and the center of gravity vaults over the legs in an inverted pendulum fashion.
[11] Which of the following liquids has the least density?
A.
Fresh water
B.
Salt water
C.
Petrol
D.
Mercury
Ans:
Petrol
Explanation :
Gasoline or petrol is a transparent, petroleum-derived liquid that is used primarily as a fuel in internal Combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives.
[12] The hair of shaving brush clings together when removed from water due to –
A.
Surface tension
B.
Viscosity
C.
Elasticity
D.
Friction
Ans:
Surface tension
Explanation :
Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. It is revealed, for example, in the floating of some objects on the surface of water, even though they are denser than water, and in the ability of some insects (e.g. water striders) to run on the water surface. This property is caused by cohesion of similar molecules, and is responsible for many of the behaviors of liquids.
[13] If a current of 1.5 A is maintained in a resistor of 10 2, then the energy dissipated in the resistor in 1 minute will be :
A.
15 W
B.
22.5 W
C.
135 W
D.
1350 W
Ans:
1350 W
Explanation :
The potential difference or voltage, V, across two points is defined as the energy, E dissipated or transferred by a coulomb of charge 9, that moves through two points.
[14] Submerged objects can be located using –
A.
Radar
B.
Sonar
C.
Quasar
D.
Pulsar
Ans:
Sonar
Explanation :
Sonar (originally an acronym for Sound Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.
[15] A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will -
A.
Increase
B.
decrease
C.
remain unaffected
D.
have its shape changed
Ans:
Increase
Explanation :
The metal ball can be considered to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e, the volume of the hollow portion will also increase.
[16] Where are mesons found?
A.
Cosmic rays
B.
X-rays
C.
Gamma rays
D.
Laser beam
Ans:
Cosmic rays
Explanation :
Mesons are not produced by radioactive decay, but appear in nature only as short-lived products of very high-energy interactions in matter, between particles made of quarks. In cosmic ray interactions, for example, suchparticles are ordinary protons and neutrons. Mesons are hadronic subatomic particles composed of one quark and one anti-quark, bound together by the strong interaction.
[17] A larger force on a rotating body results in larger _.
A.
Mass
B.
Torque
C.
Axis of rotation
D.
Centre of mass
Ans:
Axis of rotation
Explanation :
[18] Which of the following is used in oven?
A.
X-rays
B.
UV rays
C.
Microwaves
D.
Radiowaves
Ans:
Microwaves
Explanation :
An oven that uses micro radiation waves as a source of heat in order to cook food as opposed to a fire source. Conceptualized in 1946, Dr. Perry Spencer allegedly discovered the heating properties of microwaves while studying the magnetron. A microwave oven, often colloquially shortened to microwave, is a kitchen appliance that heats food by dielectric heating accomplished with radiation used to heat polarized molecules in food.
[19] The instrument used to see the distant objects on the Earth is –
A.
Terrestrial telescope
B.
Astronomical telescope
C.
Compound microscope
D.
Simple microscope
Ans:
Terrestrial telescope
Explanation :
A telescope assists the eye chiefly in two way by enlarging the visual angle under which a distant object is seen, and thus magnifying that object; and. secondly, by collecting, and conveying to the eye, a larger beam of light than would enter the naked organ, thus rendering objects distinct and visible which would otherwise be indistinct and or invisible.
[20] Which of the following principle is used to produce low-temperatures'?
A.
Super conductivity
B.
Joule-Kelvin effect
C.
Thermo-electric effect
D.
Adiabatic demagnetization
Ans:
Adiabatic demagnetization
Explanation :
Magnetic refrigeration is a cooling technology based on the magneto-caloiic effect. This technique can be used to attain extremely low temperatures, as well as the ranges used in common refrigerators, depending on the design of the system. The magneto-caloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a change in temperature of a suitable material is caused by exposing the material to a changing magnetic field.
[21] A current carrying conductor is associated with –
A.
a magnetic field
B.
an electric field
C.
an electro-magnetic field
D.
an electrostatic field
Ans:
an electro-magnetic field
Explanation :
A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles.
[22] The weakest of all fundamental forces is –
A.
Gravitational force
B.
Electrostatic force
C.
Magnetic force
D.
Nuclear force
Ans:
Gravitational force
Explanation :
In particle physics, fundamental interactions (sometimes called interactive forces or fundamental forces) are the ways that elementary particles interact with one another. An interaction is fundamental when it cannot be described in terms of other interactions. The four known fundamental interactions are electromagnetism, strong interaction ("strong nuclear force"), weak interaction ("weak nuclear force"), and gravitation. All are non-contact forces.
[23] Which of the following instruments is used to measure humidity?
A.
Kata Thermometer
B.
Anemometer
C.
Sling Psychrometer
D.
Clinical Thermometer
Ans:
Sling Psychrometer
Explanation :
A psychrometer consists of two thermometers, one which is dry and one which is kept moist with distilled water on a sock or wick. The two thermometers are thus called the dry-bulb and the wet-bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. The sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes, is sometimes used for field measurements, but is being replaced by more convenient electronic sensors.
[24] A micron is equal to –
A.
0.1 ram
B.
0.01 mm
C.
0.001 mm
D.
0.0001 mm
Ans:
0.001 mm
Explanation :
1 micron = 0.001 millimeters. A micrometre (micron) is one-millionth of a metre (or one-thousandth of a millimetre, 0.001 mm). Its unit symbol in the International System of Units (SI) is µm. It is a common unit of measurement for wavelengths of infrared radiation as well as sizes of cells and bacteria.
[25] Persons suffering from myopia are advised to use –
A.
convex lens
B.
concave lens
C.
piano-convex lens
D.
plano-concave lens
Ans:
concave lens
Explanation :
A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.
Explanation :
Copper: 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[8] Flight Recorder is technically called :
A.
Dark box
B.
Blind box
C.
Black box
D.
Altitude meter
Ans:
Black box
Explanation :
A flight data recorder (FDR) is an electronic device employed to record any instructions sent to any electronic systems on an aircraft. Another kind of flight recorder is the cockpit voice recorder which records conversation in the cockpit, radio Communications between the cockpit crew and others (including conversation with air traffic control personnel), as well as ambient sounds.
[9] The part of the eye having the largest refractive index is -
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
Like a camera, the human eye uses a convex lens system to form a small, inverted, real image of an object in front of it. Lens is the part of the eye having the largest refractive index.
[10] The centre of gravity of a sprinter during the race lies –
A.
Ahead of his feet
B.
Behind his feet
C.
At the centre of the body
D.
To the left side of the body
Ans:
Ahead of his feet
Explanation :
Running is a means of terrestrial locomotion allowing humans and other animals to move rapidly on foot. It is simply defined in athletics terms as a gait in which at regular points during the running cycle both feel are off the ground. This is in contrast to walking, where one foot is always in contact with the ground, the legs are kept mostly straight and the center of gravity vaults over the legs in an inverted pendulum fashion.
[11] Which of the following liquids has the least density?
A.
Fresh water
B.
Salt water
C.
Petrol
D.
Mercury
Ans:
Petrol
Explanation :
Gasoline or petrol is a transparent, petroleum-derived liquid that is used primarily as a fuel in internal Combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives.
[12] The hair of shaving brush clings together when removed from water due to –
A.
Surface tension
B.
Viscosity
C.
Elasticity
D.
Friction
Ans:
Surface tension
Explanation :
Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. It is revealed, for example, in the floating of some objects on the surface of water, even though they are denser than water, and in the ability of some insects (e.g. water striders) to run on the water surface. This property is caused by cohesion of similar molecules, and is responsible for many of the behaviors of liquids.
[13] If a current of 1.5 A is maintained in a resistor of 10 2, then the energy dissipated in the resistor in 1 minute will be :
A.
15 W
B.
22.5 W
C.
135 W
D.
1350 W
Ans:
1350 W
Explanation :
The potential difference or voltage, V, across two points is defined as the energy, E dissipated or transferred by a coulomb of charge 9, that moves through two points.
[14] Submerged objects can be located using –
A.
Radar
B.
Sonar
C.
Quasar
D.
Pulsar
Ans:
Sonar
Explanation :
Sonar (originally an acronym for Sound Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.
[15] A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will -
A.
Increase
B.
decrease
C.
remain unaffected
D.
have its shape changed
Ans:
Increase
Explanation :
The metal ball can be considered to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e, the volume of the hollow portion will also increase.
[16] Where are mesons found?
A.
Cosmic rays
B.
X-rays
C.
Gamma rays
D.
Laser beam
Ans:
Cosmic rays
Explanation :
Mesons are not produced by radioactive decay, but appear in nature only as short-lived products of very high-energy interactions in matter, between particles made of quarks. In cosmic ray interactions, for example, suchparticles are ordinary protons and neutrons. Mesons are hadronic subatomic particles composed of one quark and one anti-quark, bound together by the strong interaction.
[17] A larger force on a rotating body results in larger _.
A.
Mass
B.
Torque
C.
Axis of rotation
D.
Centre of mass
Ans:
Axis of rotation
Explanation :
[18] Which of the following is used in oven?
A.
X-rays
B.
UV rays
C.
Microwaves
D.
Radiowaves
Ans:
Microwaves
Explanation :
An oven that uses micro radiation waves as a source of heat in order to cook food as opposed to a fire source. Conceptualized in 1946, Dr. Perry Spencer allegedly discovered the heating properties of microwaves while studying the magnetron. A microwave oven, often colloquially shortened to microwave, is a kitchen appliance that heats food by dielectric heating accomplished with radiation used to heat polarized molecules in food.
[19] The instrument used to see the distant objects on the Earth is –
A.
Terrestrial telescope
B.
Astronomical telescope
C.
Compound microscope
D.
Simple microscope
Ans:
Terrestrial telescope
Explanation :
A telescope assists the eye chiefly in two way by enlarging the visual angle under which a distant object is seen, and thus magnifying that object; and. secondly, by collecting, and conveying to the eye, a larger beam of light than would enter the naked organ, thus rendering objects distinct and visible which would otherwise be indistinct and or invisible.
[20] Which of the following principle is used to produce low-temperatures'?
A.
Super conductivity
B.
Joule-Kelvin effect
C.
Thermo-electric effect
D.
Adiabatic demagnetization
Ans:
Adiabatic demagnetization
Explanation :
Magnetic refrigeration is a cooling technology based on the magneto-caloiic effect. This technique can be used to attain extremely low temperatures, as well as the ranges used in common refrigerators, depending on the design of the system. The magneto-caloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a change in temperature of a suitable material is caused by exposing the material to a changing magnetic field.
[21] A current carrying conductor is associated with –
A.
a magnetic field
B.
an electric field
C.
an electro-magnetic field
D.
an electrostatic field
Ans:
an electro-magnetic field
Explanation :
A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles.
[22] The weakest of all fundamental forces is –
A.
Gravitational force
B.
Electrostatic force
C.
Magnetic force
D.
Nuclear force
Ans:
Gravitational force
Explanation :
In particle physics, fundamental interactions (sometimes called interactive forces or fundamental forces) are the ways that elementary particles interact with one another. An interaction is fundamental when it cannot be described in terms of other interactions. The four known fundamental interactions are electromagnetism, strong interaction ("strong nuclear force"), weak interaction ("weak nuclear force"), and gravitation. All are non-contact forces.
[23] Which of the following instruments is used to measure humidity?
A.
Kata Thermometer
B.
Anemometer
C.
Sling Psychrometer
D.
Clinical Thermometer
Ans:
Sling Psychrometer
Explanation :
A psychrometer consists of two thermometers, one which is dry and one which is kept moist with distilled water on a sock or wick. The two thermometers are thus called the dry-bulb and the wet-bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. The sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes, is sometimes used for field measurements, but is being replaced by more convenient electronic sensors.
[24] A micron is equal to –
A.
0.1 ram
B.
0.01 mm
C.
0.001 mm
D.
0.0001 mm
Ans:
0.001 mm
Explanation :
1 micron = 0.001 millimeters. A micrometre (micron) is one-millionth of a metre (or one-thousandth of a millimetre, 0.001 mm). Its unit symbol in the International System of Units (SI) is µm. It is a common unit of measurement for wavelengths of infrared radiation as well as sizes of cells and bacteria.
[25] Persons suffering from myopia are advised to use –
A.
convex lens
B.
concave lens
C.
piano-convex lens
D.
plano-concave lens
Ans:
concave lens
Explanation :
A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.
Explanation :
Like a camera, the human eye uses a convex lens system to form a small, inverted, real image of an object in front of it. Lens is the part of the eye having the largest refractive index.
[10] The centre of gravity of a sprinter during the race lies –
A.
Ahead of his feet
B.
Behind his feet
C.
At the centre of the body
D.
To the left side of the body
Ans:
Ahead of his feet
Explanation :
Running is a means of terrestrial locomotion allowing humans and other animals to move rapidly on foot. It is simply defined in athletics terms as a gait in which at regular points during the running cycle both feel are off the ground. This is in contrast to walking, where one foot is always in contact with the ground, the legs are kept mostly straight and the center of gravity vaults over the legs in an inverted pendulum fashion.
[11] Which of the following liquids has the least density?
A.
Fresh water
B.
Salt water
C.
Petrol
D.
Mercury
Ans:
Petrol
Explanation :
Gasoline or petrol is a transparent, petroleum-derived liquid that is used primarily as a fuel in internal Combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives.
[12] The hair of shaving brush clings together when removed from water due to –
A.
Surface tension
B.
Viscosity
C.
Elasticity
D.
Friction
Ans:
Surface tension
Explanation :
Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. It is revealed, for example, in the floating of some objects on the surface of water, even though they are denser than water, and in the ability of some insects (e.g. water striders) to run on the water surface. This property is caused by cohesion of similar molecules, and is responsible for many of the behaviors of liquids.
[13] If a current of 1.5 A is maintained in a resistor of 10 2, then the energy dissipated in the resistor in 1 minute will be :
A.
15 W
B.
22.5 W
C.
135 W
D.
1350 W
Ans:
1350 W
Explanation :
The potential difference or voltage, V, across two points is defined as the energy, E dissipated or transferred by a coulomb of charge 9, that moves through two points.
[14] Submerged objects can be located using –
A.
Radar
B.
Sonar
C.
Quasar
D.
Pulsar
Ans:
Sonar
Explanation :
Sonar (originally an acronym for Sound Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.
[15] A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will -
A.
Increase
B.
decrease
C.
remain unaffected
D.
have its shape changed
Ans:
Increase
Explanation :
The metal ball can be considered to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e, the volume of the hollow portion will also increase.
[16] Where are mesons found?
A.
Cosmic rays
B.
X-rays
C.
Gamma rays
D.
Laser beam
Ans:
Cosmic rays
Explanation :
Mesons are not produced by radioactive decay, but appear in nature only as short-lived products of very high-energy interactions in matter, between particles made of quarks. In cosmic ray interactions, for example, suchparticles are ordinary protons and neutrons. Mesons are hadronic subatomic particles composed of one quark and one anti-quark, bound together by the strong interaction.
[17] A larger force on a rotating body results in larger _.
A.
Mass
B.
Torque
C.
Axis of rotation
D.
Centre of mass
Ans:
Axis of rotation
Explanation :
[18] Which of the following is used in oven?
A.
X-rays
B.
UV rays
C.
Microwaves
D.
Radiowaves
Ans:
Microwaves
Explanation :
An oven that uses micro radiation waves as a source of heat in order to cook food as opposed to a fire source. Conceptualized in 1946, Dr. Perry Spencer allegedly discovered the heating properties of microwaves while studying the magnetron. A microwave oven, often colloquially shortened to microwave, is a kitchen appliance that heats food by dielectric heating accomplished with radiation used to heat polarized molecules in food.
[19] The instrument used to see the distant objects on the Earth is –
A.
Terrestrial telescope
B.
Astronomical telescope
C.
Compound microscope
D.
Simple microscope
Ans:
Terrestrial telescope
Explanation :
A telescope assists the eye chiefly in two way by enlarging the visual angle under which a distant object is seen, and thus magnifying that object; and. secondly, by collecting, and conveying to the eye, a larger beam of light than would enter the naked organ, thus rendering objects distinct and visible which would otherwise be indistinct and or invisible.
[20] Which of the following principle is used to produce low-temperatures'?
A.
Super conductivity
B.
Joule-Kelvin effect
C.
Thermo-electric effect
D.
Adiabatic demagnetization
Ans:
Adiabatic demagnetization
Explanation :
Magnetic refrigeration is a cooling technology based on the magneto-caloiic effect. This technique can be used to attain extremely low temperatures, as well as the ranges used in common refrigerators, depending on the design of the system. The magneto-caloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a change in temperature of a suitable material is caused by exposing the material to a changing magnetic field.
[21] A current carrying conductor is associated with –
A.
a magnetic field
B.
an electric field
C.
an electro-magnetic field
D.
an electrostatic field
Ans:
an electro-magnetic field
Explanation :
A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles.
[22] The weakest of all fundamental forces is –
A.
Gravitational force
B.
Electrostatic force
C.
Magnetic force
D.
Nuclear force
Ans:
Gravitational force
Explanation :
In particle physics, fundamental interactions (sometimes called interactive forces or fundamental forces) are the ways that elementary particles interact with one another. An interaction is fundamental when it cannot be described in terms of other interactions. The four known fundamental interactions are electromagnetism, strong interaction ("strong nuclear force"), weak interaction ("weak nuclear force"), and gravitation. All are non-contact forces.
[23] Which of the following instruments is used to measure humidity?
A.
Kata Thermometer
B.
Anemometer
C.
Sling Psychrometer
D.
Clinical Thermometer
Ans:
Sling Psychrometer
Explanation :
A psychrometer consists of two thermometers, one which is dry and one which is kept moist with distilled water on a sock or wick. The two thermometers are thus called the dry-bulb and the wet-bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. The sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes, is sometimes used for field measurements, but is being replaced by more convenient electronic sensors.
[24] A micron is equal to –
A.
0.1 ram
B.
0.01 mm
C.
0.001 mm
D.
0.0001 mm
Ans:
0.001 mm
Explanation :
1 micron = 0.001 millimeters. A micrometre (micron) is one-millionth of a metre (or one-thousandth of a millimetre, 0.001 mm). Its unit symbol in the International System of Units (SI) is µm. It is a common unit of measurement for wavelengths of infrared radiation as well as sizes of cells and bacteria.
[25] Persons suffering from myopia are advised to use –
A.
convex lens
B.
concave lens
C.
piano-convex lens
D.
plano-concave lens
Ans:
concave lens
Explanation :
A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.
Explanation :
Gasoline or petrol is a transparent, petroleum-derived liquid that is used primarily as a fuel in internal Combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives.
[12] The hair of shaving brush clings together when removed from water due to –
A.
Surface tension
B.
Viscosity
C.
Elasticity
D.
Friction
Ans:
Surface tension
Explanation :
Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. It is revealed, for example, in the floating of some objects on the surface of water, even though they are denser than water, and in the ability of some insects (e.g. water striders) to run on the water surface. This property is caused by cohesion of similar molecules, and is responsible for many of the behaviors of liquids.
[13] If a current of 1.5 A is maintained in a resistor of 10 2, then the energy dissipated in the resistor in 1 minute will be :
A.
15 W
B.
22.5 W
C.
135 W
D.
1350 W
Ans:
1350 W
Explanation :
The potential difference or voltage, V, across two points is defined as the energy, E dissipated or transferred by a coulomb of charge 9, that moves through two points.
[14] Submerged objects can be located using –
A.
Radar
B.
Sonar
C.
Quasar
D.
Pulsar
Ans:
Sonar
Explanation :
Sonar (originally an acronym for Sound Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.
[15] A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will -
A.
Increase
B.
decrease
C.
remain unaffected
D.
have its shape changed
Ans:
Increase
Explanation :
The metal ball can be considered to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e, the volume of the hollow portion will also increase.
[16] Where are mesons found?
A.
Cosmic rays
B.
X-rays
C.
Gamma rays
D.
Laser beam
Ans:
Cosmic rays
Explanation :
Mesons are not produced by radioactive decay, but appear in nature only as short-lived products of very high-energy interactions in matter, between particles made of quarks. In cosmic ray interactions, for example, suchparticles are ordinary protons and neutrons. Mesons are hadronic subatomic particles composed of one quark and one anti-quark, bound together by the strong interaction.
[17] A larger force on a rotating body results in larger _.
A.
Mass
B.
Torque
C.
Axis of rotation
D.
Centre of mass
Ans:
Axis of rotation
Explanation :
[18] Which of the following is used in oven?
A.
X-rays
B.
UV rays
C.
Microwaves
D.
Radiowaves
Ans:
Microwaves
Explanation :
An oven that uses micro radiation waves as a source of heat in order to cook food as opposed to a fire source. Conceptualized in 1946, Dr. Perry Spencer allegedly discovered the heating properties of microwaves while studying the magnetron. A microwave oven, often colloquially shortened to microwave, is a kitchen appliance that heats food by dielectric heating accomplished with radiation used to heat polarized molecules in food.
[19] The instrument used to see the distant objects on the Earth is –
A.
Terrestrial telescope
B.
Astronomical telescope
C.
Compound microscope
D.
Simple microscope
Ans:
Terrestrial telescope
Explanation :
A telescope assists the eye chiefly in two way by enlarging the visual angle under which a distant object is seen, and thus magnifying that object; and. secondly, by collecting, and conveying to the eye, a larger beam of light than would enter the naked organ, thus rendering objects distinct and visible which would otherwise be indistinct and or invisible.
[20] Which of the following principle is used to produce low-temperatures'?
A.
Super conductivity
B.
Joule-Kelvin effect
C.
Thermo-electric effect
D.
Adiabatic demagnetization
Ans:
Adiabatic demagnetization
Explanation :
Magnetic refrigeration is a cooling technology based on the magneto-caloiic effect. This technique can be used to attain extremely low temperatures, as well as the ranges used in common refrigerators, depending on the design of the system. The magneto-caloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a change in temperature of a suitable material is caused by exposing the material to a changing magnetic field.
[21] A current carrying conductor is associated with –
A.
a magnetic field
B.
an electric field
C.
an electro-magnetic field
D.
an electrostatic field
Ans:
an electro-magnetic field
Explanation :
A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles.
[22] The weakest of all fundamental forces is –
A.
Gravitational force
B.
Electrostatic force
C.
Magnetic force
D.
Nuclear force
Ans:
Gravitational force
Explanation :
In particle physics, fundamental interactions (sometimes called interactive forces or fundamental forces) are the ways that elementary particles interact with one another. An interaction is fundamental when it cannot be described in terms of other interactions. The four known fundamental interactions are electromagnetism, strong interaction ("strong nuclear force"), weak interaction ("weak nuclear force"), and gravitation. All are non-contact forces.
[23] Which of the following instruments is used to measure humidity?
A.
Kata Thermometer
B.
Anemometer
C.
Sling Psychrometer
D.
Clinical Thermometer
Ans:
Sling Psychrometer
Explanation :
A psychrometer consists of two thermometers, one which is dry and one which is kept moist with distilled water on a sock or wick. The two thermometers are thus called the dry-bulb and the wet-bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. The sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes, is sometimes used for field measurements, but is being replaced by more convenient electronic sensors.
[24] A micron is equal to –
A.
0.1 ram
B.
0.01 mm
C.
0.001 mm
D.
0.0001 mm
Ans:
0.001 mm
Explanation :
1 micron = 0.001 millimeters. A micrometre (micron) is one-millionth of a metre (or one-thousandth of a millimetre, 0.001 mm). Its unit symbol in the International System of Units (SI) is µm. It is a common unit of measurement for wavelengths of infrared radiation as well as sizes of cells and bacteria.
[25] Persons suffering from myopia are advised to use –
A.
convex lens
B.
concave lens
C.
piano-convex lens
D.
plano-concave lens
Ans:
concave lens
Explanation :
A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.
Explanation :
The potential difference or voltage, V, across two points is defined as the energy, E dissipated or transferred by a coulomb of charge 9, that moves through two points.
[14] Submerged objects can be located using –
A.
Radar
B.
Sonar
C.
Quasar
D.
Pulsar
Ans:
Sonar
Explanation :
Sonar (originally an acronym for Sound Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.
[15] A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will -
A.
Increase
B.
decrease
C.
remain unaffected
D.
have its shape changed
Ans:
Increase
Explanation :
The metal ball can be considered to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e, the volume of the hollow portion will also increase.
[16] Where are mesons found?
A.
Cosmic rays
B.
X-rays
C.
Gamma rays
D.
Laser beam
Ans:
Cosmic rays
Explanation :
Mesons are not produced by radioactive decay, but appear in nature only as short-lived products of very high-energy interactions in matter, between particles made of quarks. In cosmic ray interactions, for example, suchparticles are ordinary protons and neutrons. Mesons are hadronic subatomic particles composed of one quark and one anti-quark, bound together by the strong interaction.
[17] A larger force on a rotating body results in larger _.
A.
Mass
B.
Torque
C.
Axis of rotation
D.
Centre of mass
Ans:
Axis of rotation
Explanation :
[18] Which of the following is used in oven?
A.
X-rays
B.
UV rays
C.
Microwaves
D.
Radiowaves
Ans:
Microwaves
Explanation :
An oven that uses micro radiation waves as a source of heat in order to cook food as opposed to a fire source. Conceptualized in 1946, Dr. Perry Spencer allegedly discovered the heating properties of microwaves while studying the magnetron. A microwave oven, often colloquially shortened to microwave, is a kitchen appliance that heats food by dielectric heating accomplished with radiation used to heat polarized molecules in food.
[19] The instrument used to see the distant objects on the Earth is –
A.
Terrestrial telescope
B.
Astronomical telescope
C.
Compound microscope
D.
Simple microscope
Ans:
Terrestrial telescope
Explanation :
A telescope assists the eye chiefly in two way by enlarging the visual angle under which a distant object is seen, and thus magnifying that object; and. secondly, by collecting, and conveying to the eye, a larger beam of light than would enter the naked organ, thus rendering objects distinct and visible which would otherwise be indistinct and or invisible.
[20] Which of the following principle is used to produce low-temperatures'?
A.
Super conductivity
B.
Joule-Kelvin effect
C.
Thermo-electric effect
D.
Adiabatic demagnetization
Ans:
Adiabatic demagnetization
Explanation :
Magnetic refrigeration is a cooling technology based on the magneto-caloiic effect. This technique can be used to attain extremely low temperatures, as well as the ranges used in common refrigerators, depending on the design of the system. The magneto-caloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a change in temperature of a suitable material is caused by exposing the material to a changing magnetic field.
[21] A current carrying conductor is associated with –
A.
a magnetic field
B.
an electric field
C.
an electro-magnetic field
D.
an electrostatic field
Ans:
an electro-magnetic field
Explanation :
A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles.
[22] The weakest of all fundamental forces is –
A.
Gravitational force
B.
Electrostatic force
C.
Magnetic force
D.
Nuclear force
Ans:
Gravitational force
Explanation :
In particle physics, fundamental interactions (sometimes called interactive forces or fundamental forces) are the ways that elementary particles interact with one another. An interaction is fundamental when it cannot be described in terms of other interactions. The four known fundamental interactions are electromagnetism, strong interaction ("strong nuclear force"), weak interaction ("weak nuclear force"), and gravitation. All are non-contact forces.
[23] Which of the following instruments is used to measure humidity?
A.
Kata Thermometer
B.
Anemometer
C.
Sling Psychrometer
D.
Clinical Thermometer
Ans:
Sling Psychrometer
Explanation :
A psychrometer consists of two thermometers, one which is dry and one which is kept moist with distilled water on a sock or wick. The two thermometers are thus called the dry-bulb and the wet-bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. The sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes, is sometimes used for field measurements, but is being replaced by more convenient electronic sensors.
[24] A micron is equal to –
A.
0.1 ram
B.
0.01 mm
C.
0.001 mm
D.
0.0001 mm
Ans:
0.001 mm
Explanation :
1 micron = 0.001 millimeters. A micrometre (micron) is one-millionth of a metre (or one-thousandth of a millimetre, 0.001 mm). Its unit symbol in the International System of Units (SI) is µm. It is a common unit of measurement for wavelengths of infrared radiation as well as sizes of cells and bacteria.
[25] Persons suffering from myopia are advised to use –
A.
convex lens
B.
concave lens
C.
piano-convex lens
D.
plano-concave lens
Ans:
concave lens
Explanation :
A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.
Explanation :
The metal ball can be considered to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e, the volume of the hollow portion will also increase.
[16] Where are mesons found?
A.
Cosmic rays
B.
X-rays
C.
Gamma rays
D.
Laser beam
Ans:
Cosmic rays
Explanation :
Mesons are not produced by radioactive decay, but appear in nature only as short-lived products of very high-energy interactions in matter, between particles made of quarks. In cosmic ray interactions, for example, suchparticles are ordinary protons and neutrons. Mesons are hadronic subatomic particles composed of one quark and one anti-quark, bound together by the strong interaction.
[17] A larger force on a rotating body results in larger _.
A.
Mass
B.
Torque
C.
Axis of rotation
D.
Centre of mass
Ans:
Axis of rotation
Explanation :
[18] Which of the following is used in oven?
A.
X-rays
B.
UV rays
C.
Microwaves
D.
Radiowaves
Ans:
Microwaves
Explanation :
An oven that uses micro radiation waves as a source of heat in order to cook food as opposed to a fire source. Conceptualized in 1946, Dr. Perry Spencer allegedly discovered the heating properties of microwaves while studying the magnetron. A microwave oven, often colloquially shortened to microwave, is a kitchen appliance that heats food by dielectric heating accomplished with radiation used to heat polarized molecules in food.
[19] The instrument used to see the distant objects on the Earth is –
A.
Terrestrial telescope
B.
Astronomical telescope
C.
Compound microscope
D.
Simple microscope
Ans:
Terrestrial telescope
Explanation :
A telescope assists the eye chiefly in two way by enlarging the visual angle under which a distant object is seen, and thus magnifying that object; and. secondly, by collecting, and conveying to the eye, a larger beam of light than would enter the naked organ, thus rendering objects distinct and visible which would otherwise be indistinct and or invisible.
[20] Which of the following principle is used to produce low-temperatures'?
A.
Super conductivity
B.
Joule-Kelvin effect
C.
Thermo-electric effect
D.
Adiabatic demagnetization
Ans:
Adiabatic demagnetization
Explanation :
Magnetic refrigeration is a cooling technology based on the magneto-caloiic effect. This technique can be used to attain extremely low temperatures, as well as the ranges used in common refrigerators, depending on the design of the system. The magneto-caloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a change in temperature of a suitable material is caused by exposing the material to a changing magnetic field.
[21] A current carrying conductor is associated with –
A.
a magnetic field
B.
an electric field
C.
an electro-magnetic field
D.
an electrostatic field
Ans:
an electro-magnetic field
Explanation :
A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles.
[22] The weakest of all fundamental forces is –
A.
Gravitational force
B.
Electrostatic force
C.
Magnetic force
D.
Nuclear force
Ans:
Gravitational force
Explanation :
In particle physics, fundamental interactions (sometimes called interactive forces or fundamental forces) are the ways that elementary particles interact with one another. An interaction is fundamental when it cannot be described in terms of other interactions. The four known fundamental interactions are electromagnetism, strong interaction ("strong nuclear force"), weak interaction ("weak nuclear force"), and gravitation. All are non-contact forces.
[23] Which of the following instruments is used to measure humidity?
A.
Kata Thermometer
B.
Anemometer
C.
Sling Psychrometer
D.
Clinical Thermometer
Ans:
Sling Psychrometer
Explanation :
A psychrometer consists of two thermometers, one which is dry and one which is kept moist with distilled water on a sock or wick. The two thermometers are thus called the dry-bulb and the wet-bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. The sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes, is sometimes used for field measurements, but is being replaced by more convenient electronic sensors.
[24] A micron is equal to –
A.
0.1 ram
B.
0.01 mm
C.
0.001 mm
D.
0.0001 mm
Ans:
0.001 mm
Explanation :
1 micron = 0.001 millimeters. A micrometre (micron) is one-millionth of a metre (or one-thousandth of a millimetre, 0.001 mm). Its unit symbol in the International System of Units (SI) is µm. It is a common unit of measurement for wavelengths of infrared radiation as well as sizes of cells and bacteria.
[25] Persons suffering from myopia are advised to use –
A.
convex lens
B.
concave lens
C.
piano-convex lens
D.
plano-concave lens
Ans:
concave lens
Explanation :
A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.
Explanation :
[18] Which of the following is used in oven?
A.
X-rays
B.
UV rays
C.
Microwaves
D.
Radiowaves
Ans:
Microwaves
Explanation :
An oven that uses micro radiation waves as a source of heat in order to cook food as opposed to a fire source. Conceptualized in 1946, Dr. Perry Spencer allegedly discovered the heating properties of microwaves while studying the magnetron. A microwave oven, often colloquially shortened to microwave, is a kitchen appliance that heats food by dielectric heating accomplished with radiation used to heat polarized molecules in food.
[19] The instrument used to see the distant objects on the Earth is –
A.
Terrestrial telescope
B.
Astronomical telescope
C.
Compound microscope
D.
Simple microscope
Ans:
Terrestrial telescope
Explanation :
A telescope assists the eye chiefly in two way by enlarging the visual angle under which a distant object is seen, and thus magnifying that object; and. secondly, by collecting, and conveying to the eye, a larger beam of light than would enter the naked organ, thus rendering objects distinct and visible which would otherwise be indistinct and or invisible.
[20] Which of the following principle is used to produce low-temperatures'?
A.
Super conductivity
B.
Joule-Kelvin effect
C.
Thermo-electric effect
D.
Adiabatic demagnetization
Ans:
Adiabatic demagnetization
Explanation :
Magnetic refrigeration is a cooling technology based on the magneto-caloiic effect. This technique can be used to attain extremely low temperatures, as well as the ranges used in common refrigerators, depending on the design of the system. The magneto-caloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a change in temperature of a suitable material is caused by exposing the material to a changing magnetic field.
[21] A current carrying conductor is associated with –
A.
a magnetic field
B.
an electric field
C.
an electro-magnetic field
D.
an electrostatic field
Ans:
an electro-magnetic field
Explanation :
A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles.
[22] The weakest of all fundamental forces is –
A.
Gravitational force
B.
Electrostatic force
C.
Magnetic force
D.
Nuclear force
Ans:
Gravitational force
Explanation :
In particle physics, fundamental interactions (sometimes called interactive forces or fundamental forces) are the ways that elementary particles interact with one another. An interaction is fundamental when it cannot be described in terms of other interactions. The four known fundamental interactions are electromagnetism, strong interaction ("strong nuclear force"), weak interaction ("weak nuclear force"), and gravitation. All are non-contact forces.
[23] Which of the following instruments is used to measure humidity?
A.
Kata Thermometer
B.
Anemometer
C.
Sling Psychrometer
D.
Clinical Thermometer
Ans:
Sling Psychrometer
Explanation :
A psychrometer consists of two thermometers, one which is dry and one which is kept moist with distilled water on a sock or wick. The two thermometers are thus called the dry-bulb and the wet-bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. The sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes, is sometimes used for field measurements, but is being replaced by more convenient electronic sensors.
[24] A micron is equal to –
A.
0.1 ram
B.
0.01 mm
C.
0.001 mm
D.
0.0001 mm
Ans:
0.001 mm
Explanation :
1 micron = 0.001 millimeters. A micrometre (micron) is one-millionth of a metre (or one-thousandth of a millimetre, 0.001 mm). Its unit symbol in the International System of Units (SI) is µm. It is a common unit of measurement for wavelengths of infrared radiation as well as sizes of cells and bacteria.
[25] Persons suffering from myopia are advised to use –
A.
convex lens
B.
concave lens
C.
piano-convex lens
D.
plano-concave lens
Ans:
concave lens
Explanation :
A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.
Explanation :
A telescope assists the eye chiefly in two way by enlarging the visual angle under which a distant object is seen, and thus magnifying that object; and. secondly, by collecting, and conveying to the eye, a larger beam of light than would enter the naked organ, thus rendering objects distinct and visible which would otherwise be indistinct and or invisible.
[20] Which of the following principle is used to produce low-temperatures'?
A.
Super conductivity
B.
Joule-Kelvin effect
C.
Thermo-electric effect
D.
Adiabatic demagnetization
Ans:
Adiabatic demagnetization
Explanation :
Magnetic refrigeration is a cooling technology based on the magneto-caloiic effect. This technique can be used to attain extremely low temperatures, as well as the ranges used in common refrigerators, depending on the design of the system. The magneto-caloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a change in temperature of a suitable material is caused by exposing the material to a changing magnetic field.
[21] A current carrying conductor is associated with –
A.
a magnetic field
B.
an electric field
C.
an electro-magnetic field
D.
an electrostatic field
Ans:
an electro-magnetic field
Explanation :
A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles.
[22] The weakest of all fundamental forces is –
A.
Gravitational force
B.
Electrostatic force
C.
Magnetic force
D.
Nuclear force
Ans:
Gravitational force
Explanation :
In particle physics, fundamental interactions (sometimes called interactive forces or fundamental forces) are the ways that elementary particles interact with one another. An interaction is fundamental when it cannot be described in terms of other interactions. The four known fundamental interactions are electromagnetism, strong interaction ("strong nuclear force"), weak interaction ("weak nuclear force"), and gravitation. All are non-contact forces.
[23] Which of the following instruments is used to measure humidity?
A.
Kata Thermometer
B.
Anemometer
C.
Sling Psychrometer
D.
Clinical Thermometer
Ans:
Sling Psychrometer
Explanation :
A psychrometer consists of two thermometers, one which is dry and one which is kept moist with distilled water on a sock or wick. The two thermometers are thus called the dry-bulb and the wet-bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. The sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes, is sometimes used for field measurements, but is being replaced by more convenient electronic sensors.
[24] A micron is equal to –
A.
0.1 ram
B.
0.01 mm
C.
0.001 mm
D.
0.0001 mm
Ans:
0.001 mm
Explanation :
1 micron = 0.001 millimeters. A micrometre (micron) is one-millionth of a metre (or one-thousandth of a millimetre, 0.001 mm). Its unit symbol in the International System of Units (SI) is µm. It is a common unit of measurement for wavelengths of infrared radiation as well as sizes of cells and bacteria.
[25] Persons suffering from myopia are advised to use –
A.
convex lens
B.
concave lens
C.
piano-convex lens
D.
plano-concave lens
Ans:
concave lens
Explanation :
A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.
Explanation :
A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles.
[22] The weakest of all fundamental forces is –
A.
Gravitational force
B.
Electrostatic force
C.
Magnetic force
D.
Nuclear force
Ans:
Gravitational force
Explanation :
In particle physics, fundamental interactions (sometimes called interactive forces or fundamental forces) are the ways that elementary particles interact with one another. An interaction is fundamental when it cannot be described in terms of other interactions. The four known fundamental interactions are electromagnetism, strong interaction ("strong nuclear force"), weak interaction ("weak nuclear force"), and gravitation. All are non-contact forces.
[23] Which of the following instruments is used to measure humidity?
A.
Kata Thermometer
B.
Anemometer
C.
Sling Psychrometer
D.
Clinical Thermometer
Ans:
Sling Psychrometer
Explanation :
A psychrometer consists of two thermometers, one which is dry and one which is kept moist with distilled water on a sock or wick. The two thermometers are thus called the dry-bulb and the wet-bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. The sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes, is sometimes used for field measurements, but is being replaced by more convenient electronic sensors.
[24] A micron is equal to –
A.
0.1 ram
B.
0.01 mm
C.
0.001 mm
D.
0.0001 mm
Ans:
0.001 mm
Explanation :
1 micron = 0.001 millimeters. A micrometre (micron) is one-millionth of a metre (or one-thousandth of a millimetre, 0.001 mm). Its unit symbol in the International System of Units (SI) is µm. It is a common unit of measurement for wavelengths of infrared radiation as well as sizes of cells and bacteria.
[25] Persons suffering from myopia are advised to use –
A.
convex lens
B.
concave lens
C.
piano-convex lens
D.
plano-concave lens
Ans:
concave lens
Explanation :
A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.
Explanation :
A psychrometer consists of two thermometers, one which is dry and one which is kept moist with distilled water on a sock or wick. The two thermometers are thus called the dry-bulb and the wet-bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. The sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes, is sometimes used for field measurements, but is being replaced by more convenient electronic sensors.
[24] A micron is equal to –
A.
0.1 ram
B.
0.01 mm
C.
0.001 mm
D.
0.0001 mm
Ans:
0.001 mm
Explanation :
1 micron = 0.001 millimeters. A micrometre (micron) is one-millionth of a metre (or one-thousandth of a millimetre, 0.001 mm). Its unit symbol in the International System of Units (SI) is µm. It is a common unit of measurement for wavelengths of infrared radiation as well as sizes of cells and bacteria.
[25] Persons suffering from myopia are advised to use –
A.
convex lens
B.
concave lens
C.
piano-convex lens
D.
plano-concave lens
Ans:
concave lens
Explanation :
A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.
Explanation :
A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.