[1] Intensity of any wave is proportional to which of the following?
A.
Amplitude
B.
Square of amplitude
C.
Square root of amplitude
D.
Cube of amplitude
Ans:
Square of amplitude
Explanation :
The energy of a wave is proportional to the square of its amplitude. Therefore, the intensity of a wave is also proportional to the square of its amplitude.
[2] The large collection of stars, dust and gas held together by gravitational attraction between components is known as –
A.
Cluster
B.
Atmosphere
C.
Galaxy
D.
Sun Family
Ans:
Galaxy
Explanation :
The term galaxy refers to a large collection of stars, dust, and has clouds which are held together by gravitational attraction. The smallest galaxies may contain only a few hundred thousand stars, while the largest galaxies have thousands of billions of stars. The Milky Way galaxy contains our solar system.
[3] The working of a rocket is based on the principle of:
A.
Conservation of momentum
B.
Conservation of mass
C.
Conservation of energy
D.
Conservation of angular momentum
Ans:
Conservation of momentum
Explanation :
The operation of a rocket illustrates the conservation of momentum. Just before launching, the momentum of the rocket is zero. When the rocket is fired, it forces a jet of hot gases with a high velocity through the nozzle. The jet of gases acquires a momentum downwards. Hence, the rocket acquires a momentum of equal magnitude in opposite direction. Thus the rocket moves upwards.
[4] Light waves projected on oil surface show seven colours due to the phenomenon of -
A.
polarisation
B.
refraction
C.
reflection
D.
interference
Ans:
interference
Explanation :
In physics, interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude.
[5] Which of the following has the maximum specific heat capacity?
A.
water
B.
piece of iron
C.
piece of gold
D.
chloroform
Ans:
water
Explanation :
Heat capacity (usually denoted by a capital C, often with subscripts), or thermal capacity, is the measurable physical quantity that characterizes the amount of heat required to change a substance’s temperature by a given amount. In the International System of Units (SI), heat capacity is expressed in units of joule(s) (J) per Kelvin (K). Among iron piece, water, gold piece and benzene; water has the maximum heat capacity i.e. 4.1813 j/g.k.
[6] Which variety of glass is heat resistant?
A.
Hard glass
B.
Flint glass
C.
Pyrex glass
D.
Bottle glas
Ans:
Pyrex glass
Explanation :
Older clear-glass Pyrex manufactured by Corning, Arc International's Pyrex products, and Pyrex laboratory glassware are made of borosilicate glass.
[7] The waves used in sonography are –
A.
Micro waves
B.
Infra-red waves
C.
Sound waves
D.
Ultrasonic waves
Ans:
Ultrasonic waves
Explanation :
Sonography is an ultrasound-based diagnostic imaging technique used for visualizing internal body structures including tendons, muscles, joints, vessels and internal organs for possible pathology or lesions.
[8] Which of the following is a scalar quantity?
A.
Velocity
B.
Force
C.
Angular momentum
D.
Electrostatic potential
Ans:
Electrostatic potential
Explanation :
The electrostatic potential at any point in an electric field is defined as the work done in bringing a unit positive charge from infinity to that point against the electric force of the field. It is given by, V = W/q, where V is the potential, W is work done, and q the charge. Because work and charge both are scalar quantity, electrostatic potential is also a scalar quantity
[9] The sky appears blue due to –
A.
Rayleigh scattering
B.
Mie scattering
C.
Back scattering
D.
None of the above
Ans:
Rayleigh scattering
Explanation :
The blue colour of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky.
[10] The device used to convert solar energy into electricity is –
A.
Photovoltaic cell
B.
Daniell cell
C.
Electrochemical cell
D.
Galvanic cell
Ans:
Photovoltaic cell
Explanation :
Sunlight is converted into electricity using photovoltaics (PV). A photovoltaic system employs solar panels composed of a number of solar cells to supply usable solar power.
[11] If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same -
A.
velocity
B.
momentum
C.
acceleration
D.
kinetic energy
Ans:
momentum
Explanation :
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same momentum.
[12] The absorption of ink by blotting paper involves -
A.
capillary action phenomenon
B.
viscosity of ink
C.
siphon action
D.
diffusion of ink through the blotting
Ans:
capillary action phenomenon
Explanation :
The ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.
[13] A fuse wire is made of:
A.
an alloy of tin and copper
B.
an alloy of tin and lead
C.
an alloy of tin and aluminium
D.
an alloy of nickel and chromium
Ans:
an alloy of tin and lead
Explanation :
Electric fuse wire is an alloy made of tin (63 % lead 37 %. The cross sectional area determines the melting point at a certain current. Alloys (e.g. tin/ lead) are used due to their 'eutectic' action -i.e. the resulting combination of good conductivity (due to the tin) with a low melting point due to the lead).
[14] Ultra violet light of Sun's radiation is prevented from reaching the earth's atmosphere by the layer of –
A.
Oxygen
B.
Hydrogen
C.
Ozone
D.
Helium
Ans:
Ozone
Explanation :
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03). The layer absorbs 97-99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth.
[15] Which instrument is used to measure depth of ocean?
A.
Galvanometer
B.
Fluxmeter
C.
Endoscope
D.
Fathometer
Ans:
Fathometer
Explanation :
Galvanometer - measures electric current, Fluxmeter - measures magnetic flux, Endoscope - used to examine internal parts of the body.
[16] When a running car stops suddenly, the passengers tends to lean forward because of:
A.
centrifugal force
B.
inertia of rest
C.
inertia of motion
D.
gravitational force
Ans:
inertia of motion
Explanation :
When a running car stops suddenly, the passengers tend to lean forward due to inertia of motion. Inertia is that property of a body due to which it resists a change in its state of rest or of uniform motion.
[17] Why the Earth is having its own atmosphere?
A.
Winds
B.
Clouds
C.
Gravity
D.
Rotation of the Earth
Ans:
Gravity
Explanation :
Due to gravity, our Earth has an atmosphere. Gravity causes the gases to be held close to the earth instead of escaping into outer space. Besides, gravity makes the atmosphere denser closer to the Earth – the upper layers push down against the lower layers.
[18] A ray of white light strikes the surface of an object. If all the colours are reflected, the surface would appear
A.
Black
B.
White
C.
Grey
D.
Opaque
Ans:
White
Explanation :
Objects do not have any colour of their own. When light hits a surface, some of it is absorbed and some of it is reflected. The light that is reflected is the colour of the object in that light. Objects appear white when they reflect all the wavelengths; they appear black when they absorb all visible wavelengths.
[19] It is difficult to walk on ice because of .
A.
absence of friction
B.
less inertia
C.
more inertia
D.
more mass
Ans:
absence of friction
Explanation :
It's difficult to walk on ice because there's very little friction between the bottoms of your shoes and the ice. Friction is a force that opposes motion.
[20] One bar is equal to –
A.
10³ Pa
B.
1003 Pa
C.
10⁵ Pa
D.
10⁴ Pa
Ans:
10⁵ Pa
Explanation :
The bar is a non-Si unit of pressure. It is defined by the IUPAC as exactly equal to 100,000 Pa or 1O Pa.
[21] A NOT gate can be implemented by:
A.
a single diode
B.
two diodes
C.
a single resistor
D.
a single transistor
Ans:
a single transistor
Explanation :
In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. An inverter circuit outputs a voltage representing the opposite logic-level to its input. Inverters can be constructed using a single NMOS transistor or a single PMOS transistor coupled with a resistor.
[22] Persistence of vision is the Principle behind:
A.
Binocular
B.
Cinema
C.
Periscope
D.
Camera
Ans:
Cinema
Explanation :
Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. In the early days of cinema, it was scientifically determined that a frame rate of less than 16 frames per second (frame/s) caused the mind to see flashing images.
[23] Sudden fall in barometer is indication of -
A.
Storm
B.
Rain
C.
Tide
D.
Clear weather
Ans:
Tide
Explanation :
Sudden fall in barometer is indication of Storm. A barometer measures air pressure: A "rising" barometer indicates increasing air pressure; a "falling" barometer indicates decreasing air pressure.
[24] If in a motion, the axis of the rotation does not pass through the object, then the motion is called -
A.
Spin motion
B.
Oscillatory motion
C.
Translatory motion
D.
Orbital motion
Ans:
Orbital motion
Explanation :
The axis of the rotation does not pass through the object in orbital motion. It involves the quantum mechanical motion of rigid particles (such as electrons) about some other mass, or about themselves.
[25] Who among the following evolved the concept of relationship between mass and energy?
A.
Einstein
B.
Planck
C.
Dalton
D.
Rutherford
Ans:
Einstein
Explanation :
Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics.
Explanation :
The energy of a wave is proportional to the square of its amplitude. Therefore, the intensity of a wave is also proportional to the square of its amplitude.
[2] The large collection of stars, dust and gas held together by gravitational attraction between components is known as –
A.
Cluster
B.
Atmosphere
C.
Galaxy
D.
Sun Family
Ans:
Galaxy
Explanation :
The term galaxy refers to a large collection of stars, dust, and has clouds which are held together by gravitational attraction. The smallest galaxies may contain only a few hundred thousand stars, while the largest galaxies have thousands of billions of stars. The Milky Way galaxy contains our solar system.
[3] The working of a rocket is based on the principle of:
A.
Conservation of momentum
B.
Conservation of mass
C.
Conservation of energy
D.
Conservation of angular momentum
Ans:
Conservation of momentum
Explanation :
The operation of a rocket illustrates the conservation of momentum. Just before launching, the momentum of the rocket is zero. When the rocket is fired, it forces a jet of hot gases with a high velocity through the nozzle. The jet of gases acquires a momentum downwards. Hence, the rocket acquires a momentum of equal magnitude in opposite direction. Thus the rocket moves upwards.
[4] Light waves projected on oil surface show seven colours due to the phenomenon of -
A.
polarisation
B.
refraction
C.
reflection
D.
interference
Ans:
interference
Explanation :
In physics, interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude.
[5] Which of the following has the maximum specific heat capacity?
A.
water
B.
piece of iron
C.
piece of gold
D.
chloroform
Ans:
water
Explanation :
Heat capacity (usually denoted by a capital C, often with subscripts), or thermal capacity, is the measurable physical quantity that characterizes the amount of heat required to change a substance’s temperature by a given amount. In the International System of Units (SI), heat capacity is expressed in units of joule(s) (J) per Kelvin (K). Among iron piece, water, gold piece and benzene; water has the maximum heat capacity i.e. 4.1813 j/g.k.
[6] Which variety of glass is heat resistant?
A.
Hard glass
B.
Flint glass
C.
Pyrex glass
D.
Bottle glas
Ans:
Pyrex glass
Explanation :
Older clear-glass Pyrex manufactured by Corning, Arc International's Pyrex products, and Pyrex laboratory glassware are made of borosilicate glass.
[7] The waves used in sonography are –
A.
Micro waves
B.
Infra-red waves
C.
Sound waves
D.
Ultrasonic waves
Ans:
Ultrasonic waves
Explanation :
Sonography is an ultrasound-based diagnostic imaging technique used for visualizing internal body structures including tendons, muscles, joints, vessels and internal organs for possible pathology or lesions.
[8] Which of the following is a scalar quantity?
A.
Velocity
B.
Force
C.
Angular momentum
D.
Electrostatic potential
Ans:
Electrostatic potential
Explanation :
The electrostatic potential at any point in an electric field is defined as the work done in bringing a unit positive charge from infinity to that point against the electric force of the field. It is given by, V = W/q, where V is the potential, W is work done, and q the charge. Because work and charge both are scalar quantity, electrostatic potential is also a scalar quantity
[9] The sky appears blue due to –
A.
Rayleigh scattering
B.
Mie scattering
C.
Back scattering
D.
None of the above
Ans:
Rayleigh scattering
Explanation :
The blue colour of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky.
[10] The device used to convert solar energy into electricity is –
A.
Photovoltaic cell
B.
Daniell cell
C.
Electrochemical cell
D.
Galvanic cell
Ans:
Photovoltaic cell
Explanation :
Sunlight is converted into electricity using photovoltaics (PV). A photovoltaic system employs solar panels composed of a number of solar cells to supply usable solar power.
[11] If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same -
A.
velocity
B.
momentum
C.
acceleration
D.
kinetic energy
Ans:
momentum
Explanation :
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same momentum.
[12] The absorption of ink by blotting paper involves -
A.
capillary action phenomenon
B.
viscosity of ink
C.
siphon action
D.
diffusion of ink through the blotting
Ans:
capillary action phenomenon
Explanation :
The ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.
[13] A fuse wire is made of:
A.
an alloy of tin and copper
B.
an alloy of tin and lead
C.
an alloy of tin and aluminium
D.
an alloy of nickel and chromium
Ans:
an alloy of tin and lead
Explanation :
Electric fuse wire is an alloy made of tin (63 % lead 37 %. The cross sectional area determines the melting point at a certain current. Alloys (e.g. tin/ lead) are used due to their 'eutectic' action -i.e. the resulting combination of good conductivity (due to the tin) with a low melting point due to the lead).
[14] Ultra violet light of Sun's radiation is prevented from reaching the earth's atmosphere by the layer of –
A.
Oxygen
B.
Hydrogen
C.
Ozone
D.
Helium
Ans:
Ozone
Explanation :
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03). The layer absorbs 97-99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth.
[15] Which instrument is used to measure depth of ocean?
A.
Galvanometer
B.
Fluxmeter
C.
Endoscope
D.
Fathometer
Ans:
Fathometer
Explanation :
Galvanometer - measures electric current, Fluxmeter - measures magnetic flux, Endoscope - used to examine internal parts of the body.
[16] When a running car stops suddenly, the passengers tends to lean forward because of:
A.
centrifugal force
B.
inertia of rest
C.
inertia of motion
D.
gravitational force
Ans:
inertia of motion
Explanation :
When a running car stops suddenly, the passengers tend to lean forward due to inertia of motion. Inertia is that property of a body due to which it resists a change in its state of rest or of uniform motion.
[17] Why the Earth is having its own atmosphere?
A.
Winds
B.
Clouds
C.
Gravity
D.
Rotation of the Earth
Ans:
Gravity
Explanation :
Due to gravity, our Earth has an atmosphere. Gravity causes the gases to be held close to the earth instead of escaping into outer space. Besides, gravity makes the atmosphere denser closer to the Earth – the upper layers push down against the lower layers.
[18] A ray of white light strikes the surface of an object. If all the colours are reflected, the surface would appear
A.
Black
B.
White
C.
Grey
D.
Opaque
Ans:
White
Explanation :
Objects do not have any colour of their own. When light hits a surface, some of it is absorbed and some of it is reflected. The light that is reflected is the colour of the object in that light. Objects appear white when they reflect all the wavelengths; they appear black when they absorb all visible wavelengths.
[19] It is difficult to walk on ice because of .
A.
absence of friction
B.
less inertia
C.
more inertia
D.
more mass
Ans:
absence of friction
Explanation :
It's difficult to walk on ice because there's very little friction between the bottoms of your shoes and the ice. Friction is a force that opposes motion.
[20] One bar is equal to –
A.
10³ Pa
B.
1003 Pa
C.
10⁵ Pa
D.
10⁴ Pa
Ans:
10⁵ Pa
Explanation :
The bar is a non-Si unit of pressure. It is defined by the IUPAC as exactly equal to 100,000 Pa or 1O Pa.
[21] A NOT gate can be implemented by:
A.
a single diode
B.
two diodes
C.
a single resistor
D.
a single transistor
Ans:
a single transistor
Explanation :
In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. An inverter circuit outputs a voltage representing the opposite logic-level to its input. Inverters can be constructed using a single NMOS transistor or a single PMOS transistor coupled with a resistor.
[22] Persistence of vision is the Principle behind:
A.
Binocular
B.
Cinema
C.
Periscope
D.
Camera
Ans:
Cinema
Explanation :
Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. In the early days of cinema, it was scientifically determined that a frame rate of less than 16 frames per second (frame/s) caused the mind to see flashing images.
[23] Sudden fall in barometer is indication of -
A.
Storm
B.
Rain
C.
Tide
D.
Clear weather
Ans:
Tide
Explanation :
Sudden fall in barometer is indication of Storm. A barometer measures air pressure: A "rising" barometer indicates increasing air pressure; a "falling" barometer indicates decreasing air pressure.
[24] If in a motion, the axis of the rotation does not pass through the object, then the motion is called -
A.
Spin motion
B.
Oscillatory motion
C.
Translatory motion
D.
Orbital motion
Ans:
Orbital motion
Explanation :
The axis of the rotation does not pass through the object in orbital motion. It involves the quantum mechanical motion of rigid particles (such as electrons) about some other mass, or about themselves.
[25] Who among the following evolved the concept of relationship between mass and energy?
A.
Einstein
B.
Planck
C.
Dalton
D.
Rutherford
Ans:
Einstein
Explanation :
Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics.
Explanation :
The operation of a rocket illustrates the conservation of momentum. Just before launching, the momentum of the rocket is zero. When the rocket is fired, it forces a jet of hot gases with a high velocity through the nozzle. The jet of gases acquires a momentum downwards. Hence, the rocket acquires a momentum of equal magnitude in opposite direction. Thus the rocket moves upwards.
[4] Light waves projected on oil surface show seven colours due to the phenomenon of -
A.
polarisation
B.
refraction
C.
reflection
D.
interference
Ans:
interference
Explanation :
In physics, interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude.
[5] Which of the following has the maximum specific heat capacity?
A.
water
B.
piece of iron
C.
piece of gold
D.
chloroform
Ans:
water
Explanation :
Heat capacity (usually denoted by a capital C, often with subscripts), or thermal capacity, is the measurable physical quantity that characterizes the amount of heat required to change a substance’s temperature by a given amount. In the International System of Units (SI), heat capacity is expressed in units of joule(s) (J) per Kelvin (K). Among iron piece, water, gold piece and benzene; water has the maximum heat capacity i.e. 4.1813 j/g.k.
[6] Which variety of glass is heat resistant?
A.
Hard glass
B.
Flint glass
C.
Pyrex glass
D.
Bottle glas
Ans:
Pyrex glass
Explanation :
Older clear-glass Pyrex manufactured by Corning, Arc International's Pyrex products, and Pyrex laboratory glassware are made of borosilicate glass.
[7] The waves used in sonography are –
A.
Micro waves
B.
Infra-red waves
C.
Sound waves
D.
Ultrasonic waves
Ans:
Ultrasonic waves
Explanation :
Sonography is an ultrasound-based diagnostic imaging technique used for visualizing internal body structures including tendons, muscles, joints, vessels and internal organs for possible pathology or lesions.
[8] Which of the following is a scalar quantity?
A.
Velocity
B.
Force
C.
Angular momentum
D.
Electrostatic potential
Ans:
Electrostatic potential
Explanation :
The electrostatic potential at any point in an electric field is defined as the work done in bringing a unit positive charge from infinity to that point against the electric force of the field. It is given by, V = W/q, where V is the potential, W is work done, and q the charge. Because work and charge both are scalar quantity, electrostatic potential is also a scalar quantity
[9] The sky appears blue due to –
A.
Rayleigh scattering
B.
Mie scattering
C.
Back scattering
D.
None of the above
Ans:
Rayleigh scattering
Explanation :
The blue colour of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky.
[10] The device used to convert solar energy into electricity is –
A.
Photovoltaic cell
B.
Daniell cell
C.
Electrochemical cell
D.
Galvanic cell
Ans:
Photovoltaic cell
Explanation :
Sunlight is converted into electricity using photovoltaics (PV). A photovoltaic system employs solar panels composed of a number of solar cells to supply usable solar power.
[11] If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same -
A.
velocity
B.
momentum
C.
acceleration
D.
kinetic energy
Ans:
momentum
Explanation :
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same momentum.
[12] The absorption of ink by blotting paper involves -
A.
capillary action phenomenon
B.
viscosity of ink
C.
siphon action
D.
diffusion of ink through the blotting
Ans:
capillary action phenomenon
Explanation :
The ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.
[13] A fuse wire is made of:
A.
an alloy of tin and copper
B.
an alloy of tin and lead
C.
an alloy of tin and aluminium
D.
an alloy of nickel and chromium
Ans:
an alloy of tin and lead
Explanation :
Electric fuse wire is an alloy made of tin (63 % lead 37 %. The cross sectional area determines the melting point at a certain current. Alloys (e.g. tin/ lead) are used due to their 'eutectic' action -i.e. the resulting combination of good conductivity (due to the tin) with a low melting point due to the lead).
[14] Ultra violet light of Sun's radiation is prevented from reaching the earth's atmosphere by the layer of –
A.
Oxygen
B.
Hydrogen
C.
Ozone
D.
Helium
Ans:
Ozone
Explanation :
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03). The layer absorbs 97-99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth.
[15] Which instrument is used to measure depth of ocean?
A.
Galvanometer
B.
Fluxmeter
C.
Endoscope
D.
Fathometer
Ans:
Fathometer
Explanation :
Galvanometer - measures electric current, Fluxmeter - measures magnetic flux, Endoscope - used to examine internal parts of the body.
[16] When a running car stops suddenly, the passengers tends to lean forward because of:
A.
centrifugal force
B.
inertia of rest
C.
inertia of motion
D.
gravitational force
Ans:
inertia of motion
Explanation :
When a running car stops suddenly, the passengers tend to lean forward due to inertia of motion. Inertia is that property of a body due to which it resists a change in its state of rest or of uniform motion.
[17] Why the Earth is having its own atmosphere?
A.
Winds
B.
Clouds
C.
Gravity
D.
Rotation of the Earth
Ans:
Gravity
Explanation :
Due to gravity, our Earth has an atmosphere. Gravity causes the gases to be held close to the earth instead of escaping into outer space. Besides, gravity makes the atmosphere denser closer to the Earth – the upper layers push down against the lower layers.
[18] A ray of white light strikes the surface of an object. If all the colours are reflected, the surface would appear
A.
Black
B.
White
C.
Grey
D.
Opaque
Ans:
White
Explanation :
Objects do not have any colour of their own. When light hits a surface, some of it is absorbed and some of it is reflected. The light that is reflected is the colour of the object in that light. Objects appear white when they reflect all the wavelengths; they appear black when they absorb all visible wavelengths.
[19] It is difficult to walk on ice because of .
A.
absence of friction
B.
less inertia
C.
more inertia
D.
more mass
Ans:
absence of friction
Explanation :
It's difficult to walk on ice because there's very little friction between the bottoms of your shoes and the ice. Friction is a force that opposes motion.
[20] One bar is equal to –
A.
10³ Pa
B.
1003 Pa
C.
10⁵ Pa
D.
10⁴ Pa
Ans:
10⁵ Pa
Explanation :
The bar is a non-Si unit of pressure. It is defined by the IUPAC as exactly equal to 100,000 Pa or 1O Pa.
[21] A NOT gate can be implemented by:
A.
a single diode
B.
two diodes
C.
a single resistor
D.
a single transistor
Ans:
a single transistor
Explanation :
In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. An inverter circuit outputs a voltage representing the opposite logic-level to its input. Inverters can be constructed using a single NMOS transistor or a single PMOS transistor coupled with a resistor.
[22] Persistence of vision is the Principle behind:
A.
Binocular
B.
Cinema
C.
Periscope
D.
Camera
Ans:
Cinema
Explanation :
Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. In the early days of cinema, it was scientifically determined that a frame rate of less than 16 frames per second (frame/s) caused the mind to see flashing images.
[23] Sudden fall in barometer is indication of -
A.
Storm
B.
Rain
C.
Tide
D.
Clear weather
Ans:
Tide
Explanation :
Sudden fall in barometer is indication of Storm. A barometer measures air pressure: A "rising" barometer indicates increasing air pressure; a "falling" barometer indicates decreasing air pressure.
[24] If in a motion, the axis of the rotation does not pass through the object, then the motion is called -
A.
Spin motion
B.
Oscillatory motion
C.
Translatory motion
D.
Orbital motion
Ans:
Orbital motion
Explanation :
The axis of the rotation does not pass through the object in orbital motion. It involves the quantum mechanical motion of rigid particles (such as electrons) about some other mass, or about themselves.
[25] Who among the following evolved the concept of relationship between mass and energy?
A.
Einstein
B.
Planck
C.
Dalton
D.
Rutherford
Ans:
Einstein
Explanation :
Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics.
Explanation :
Heat capacity (usually denoted by a capital C, often with subscripts), or thermal capacity, is the measurable physical quantity that characterizes the amount of heat required to change a substance’s temperature by a given amount. In the International System of Units (SI), heat capacity is expressed in units of joule(s) (J) per Kelvin (K). Among iron piece, water, gold piece and benzene; water has the maximum heat capacity i.e. 4.1813 j/g.k.
[6] Which variety of glass is heat resistant?
A.
Hard glass
B.
Flint glass
C.
Pyrex glass
D.
Bottle glas
Ans:
Pyrex glass
Explanation :
Older clear-glass Pyrex manufactured by Corning, Arc International's Pyrex products, and Pyrex laboratory glassware are made of borosilicate glass.
[7] The waves used in sonography are –
A.
Micro waves
B.
Infra-red waves
C.
Sound waves
D.
Ultrasonic waves
Ans:
Ultrasonic waves
Explanation :
Sonography is an ultrasound-based diagnostic imaging technique used for visualizing internal body structures including tendons, muscles, joints, vessels and internal organs for possible pathology or lesions.
[8] Which of the following is a scalar quantity?
A.
Velocity
B.
Force
C.
Angular momentum
D.
Electrostatic potential
Ans:
Electrostatic potential
Explanation :
The electrostatic potential at any point in an electric field is defined as the work done in bringing a unit positive charge from infinity to that point against the electric force of the field. It is given by, V = W/q, where V is the potential, W is work done, and q the charge. Because work and charge both are scalar quantity, electrostatic potential is also a scalar quantity
[9] The sky appears blue due to –
A.
Rayleigh scattering
B.
Mie scattering
C.
Back scattering
D.
None of the above
Ans:
Rayleigh scattering
Explanation :
The blue colour of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky.
[10] The device used to convert solar energy into electricity is –
A.
Photovoltaic cell
B.
Daniell cell
C.
Electrochemical cell
D.
Galvanic cell
Ans:
Photovoltaic cell
Explanation :
Sunlight is converted into electricity using photovoltaics (PV). A photovoltaic system employs solar panels composed of a number of solar cells to supply usable solar power.
[11] If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same -
A.
velocity
B.
momentum
C.
acceleration
D.
kinetic energy
Ans:
momentum
Explanation :
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same momentum.
[12] The absorption of ink by blotting paper involves -
A.
capillary action phenomenon
B.
viscosity of ink
C.
siphon action
D.
diffusion of ink through the blotting
Ans:
capillary action phenomenon
Explanation :
The ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.
[13] A fuse wire is made of:
A.
an alloy of tin and copper
B.
an alloy of tin and lead
C.
an alloy of tin and aluminium
D.
an alloy of nickel and chromium
Ans:
an alloy of tin and lead
Explanation :
Electric fuse wire is an alloy made of tin (63 % lead 37 %. The cross sectional area determines the melting point at a certain current. Alloys (e.g. tin/ lead) are used due to their 'eutectic' action -i.e. the resulting combination of good conductivity (due to the tin) with a low melting point due to the lead).
[14] Ultra violet light of Sun's radiation is prevented from reaching the earth's atmosphere by the layer of –
A.
Oxygen
B.
Hydrogen
C.
Ozone
D.
Helium
Ans:
Ozone
Explanation :
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03). The layer absorbs 97-99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth.
[15] Which instrument is used to measure depth of ocean?
A.
Galvanometer
B.
Fluxmeter
C.
Endoscope
D.
Fathometer
Ans:
Fathometer
Explanation :
Galvanometer - measures electric current, Fluxmeter - measures magnetic flux, Endoscope - used to examine internal parts of the body.
[16] When a running car stops suddenly, the passengers tends to lean forward because of:
A.
centrifugal force
B.
inertia of rest
C.
inertia of motion
D.
gravitational force
Ans:
inertia of motion
Explanation :
When a running car stops suddenly, the passengers tend to lean forward due to inertia of motion. Inertia is that property of a body due to which it resists a change in its state of rest or of uniform motion.
[17] Why the Earth is having its own atmosphere?
A.
Winds
B.
Clouds
C.
Gravity
D.
Rotation of the Earth
Ans:
Gravity
Explanation :
Due to gravity, our Earth has an atmosphere. Gravity causes the gases to be held close to the earth instead of escaping into outer space. Besides, gravity makes the atmosphere denser closer to the Earth – the upper layers push down against the lower layers.
[18] A ray of white light strikes the surface of an object. If all the colours are reflected, the surface would appear
A.
Black
B.
White
C.
Grey
D.
Opaque
Ans:
White
Explanation :
Objects do not have any colour of their own. When light hits a surface, some of it is absorbed and some of it is reflected. The light that is reflected is the colour of the object in that light. Objects appear white when they reflect all the wavelengths; they appear black when they absorb all visible wavelengths.
[19] It is difficult to walk on ice because of .
A.
absence of friction
B.
less inertia
C.
more inertia
D.
more mass
Ans:
absence of friction
Explanation :
It's difficult to walk on ice because there's very little friction between the bottoms of your shoes and the ice. Friction is a force that opposes motion.
[20] One bar is equal to –
A.
10³ Pa
B.
1003 Pa
C.
10⁵ Pa
D.
10⁴ Pa
Ans:
10⁵ Pa
Explanation :
The bar is a non-Si unit of pressure. It is defined by the IUPAC as exactly equal to 100,000 Pa or 1O Pa.
[21] A NOT gate can be implemented by:
A.
a single diode
B.
two diodes
C.
a single resistor
D.
a single transistor
Ans:
a single transistor
Explanation :
In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. An inverter circuit outputs a voltage representing the opposite logic-level to its input. Inverters can be constructed using a single NMOS transistor or a single PMOS transistor coupled with a resistor.
[22] Persistence of vision is the Principle behind:
A.
Binocular
B.
Cinema
C.
Periscope
D.
Camera
Ans:
Cinema
Explanation :
Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. In the early days of cinema, it was scientifically determined that a frame rate of less than 16 frames per second (frame/s) caused the mind to see flashing images.
[23] Sudden fall in barometer is indication of -
A.
Storm
B.
Rain
C.
Tide
D.
Clear weather
Ans:
Tide
Explanation :
Sudden fall in barometer is indication of Storm. A barometer measures air pressure: A "rising" barometer indicates increasing air pressure; a "falling" barometer indicates decreasing air pressure.
[24] If in a motion, the axis of the rotation does not pass through the object, then the motion is called -
A.
Spin motion
B.
Oscillatory motion
C.
Translatory motion
D.
Orbital motion
Ans:
Orbital motion
Explanation :
The axis of the rotation does not pass through the object in orbital motion. It involves the quantum mechanical motion of rigid particles (such as electrons) about some other mass, or about themselves.
[25] Who among the following evolved the concept of relationship between mass and energy?
A.
Einstein
B.
Planck
C.
Dalton
D.
Rutherford
Ans:
Einstein
Explanation :
Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics.
Explanation :
Sonography is an ultrasound-based diagnostic imaging technique used for visualizing internal body structures including tendons, muscles, joints, vessels and internal organs for possible pathology or lesions.
[8] Which of the following is a scalar quantity?
A.
Velocity
B.
Force
C.
Angular momentum
D.
Electrostatic potential
Ans:
Electrostatic potential
Explanation :
The electrostatic potential at any point in an electric field is defined as the work done in bringing a unit positive charge from infinity to that point against the electric force of the field. It is given by, V = W/q, where V is the potential, W is work done, and q the charge. Because work and charge both are scalar quantity, electrostatic potential is also a scalar quantity
[9] The sky appears blue due to –
A.
Rayleigh scattering
B.
Mie scattering
C.
Back scattering
D.
None of the above
Ans:
Rayleigh scattering
Explanation :
The blue colour of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky.
[10] The device used to convert solar energy into electricity is –
A.
Photovoltaic cell
B.
Daniell cell
C.
Electrochemical cell
D.
Galvanic cell
Ans:
Photovoltaic cell
Explanation :
Sunlight is converted into electricity using photovoltaics (PV). A photovoltaic system employs solar panels composed of a number of solar cells to supply usable solar power.
[11] If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same -
A.
velocity
B.
momentum
C.
acceleration
D.
kinetic energy
Ans:
momentum
Explanation :
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same momentum.
[12] The absorption of ink by blotting paper involves -
A.
capillary action phenomenon
B.
viscosity of ink
C.
siphon action
D.
diffusion of ink through the blotting
Ans:
capillary action phenomenon
Explanation :
The ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.
[13] A fuse wire is made of:
A.
an alloy of tin and copper
B.
an alloy of tin and lead
C.
an alloy of tin and aluminium
D.
an alloy of nickel and chromium
Ans:
an alloy of tin and lead
Explanation :
Electric fuse wire is an alloy made of tin (63 % lead 37 %. The cross sectional area determines the melting point at a certain current. Alloys (e.g. tin/ lead) are used due to their 'eutectic' action -i.e. the resulting combination of good conductivity (due to the tin) with a low melting point due to the lead).
[14] Ultra violet light of Sun's radiation is prevented from reaching the earth's atmosphere by the layer of –
A.
Oxygen
B.
Hydrogen
C.
Ozone
D.
Helium
Ans:
Ozone
Explanation :
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03). The layer absorbs 97-99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth.
[15] Which instrument is used to measure depth of ocean?
A.
Galvanometer
B.
Fluxmeter
C.
Endoscope
D.
Fathometer
Ans:
Fathometer
Explanation :
Galvanometer - measures electric current, Fluxmeter - measures magnetic flux, Endoscope - used to examine internal parts of the body.
[16] When a running car stops suddenly, the passengers tends to lean forward because of:
A.
centrifugal force
B.
inertia of rest
C.
inertia of motion
D.
gravitational force
Ans:
inertia of motion
Explanation :
When a running car stops suddenly, the passengers tend to lean forward due to inertia of motion. Inertia is that property of a body due to which it resists a change in its state of rest or of uniform motion.
[17] Why the Earth is having its own atmosphere?
A.
Winds
B.
Clouds
C.
Gravity
D.
Rotation of the Earth
Ans:
Gravity
Explanation :
Due to gravity, our Earth has an atmosphere. Gravity causes the gases to be held close to the earth instead of escaping into outer space. Besides, gravity makes the atmosphere denser closer to the Earth – the upper layers push down against the lower layers.
[18] A ray of white light strikes the surface of an object. If all the colours are reflected, the surface would appear
A.
Black
B.
White
C.
Grey
D.
Opaque
Ans:
White
Explanation :
Objects do not have any colour of their own. When light hits a surface, some of it is absorbed and some of it is reflected. The light that is reflected is the colour of the object in that light. Objects appear white when they reflect all the wavelengths; they appear black when they absorb all visible wavelengths.
[19] It is difficult to walk on ice because of .
A.
absence of friction
B.
less inertia
C.
more inertia
D.
more mass
Ans:
absence of friction
Explanation :
It's difficult to walk on ice because there's very little friction between the bottoms of your shoes and the ice. Friction is a force that opposes motion.
[20] One bar is equal to –
A.
10³ Pa
B.
1003 Pa
C.
10⁵ Pa
D.
10⁴ Pa
Ans:
10⁵ Pa
Explanation :
The bar is a non-Si unit of pressure. It is defined by the IUPAC as exactly equal to 100,000 Pa or 1O Pa.
[21] A NOT gate can be implemented by:
A.
a single diode
B.
two diodes
C.
a single resistor
D.
a single transistor
Ans:
a single transistor
Explanation :
In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. An inverter circuit outputs a voltage representing the opposite logic-level to its input. Inverters can be constructed using a single NMOS transistor or a single PMOS transistor coupled with a resistor.
[22] Persistence of vision is the Principle behind:
A.
Binocular
B.
Cinema
C.
Periscope
D.
Camera
Ans:
Cinema
Explanation :
Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. In the early days of cinema, it was scientifically determined that a frame rate of less than 16 frames per second (frame/s) caused the mind to see flashing images.
[23] Sudden fall in barometer is indication of -
A.
Storm
B.
Rain
C.
Tide
D.
Clear weather
Ans:
Tide
Explanation :
Sudden fall in barometer is indication of Storm. A barometer measures air pressure: A "rising" barometer indicates increasing air pressure; a "falling" barometer indicates decreasing air pressure.
[24] If in a motion, the axis of the rotation does not pass through the object, then the motion is called -
A.
Spin motion
B.
Oscillatory motion
C.
Translatory motion
D.
Orbital motion
Ans:
Orbital motion
Explanation :
The axis of the rotation does not pass through the object in orbital motion. It involves the quantum mechanical motion of rigid particles (such as electrons) about some other mass, or about themselves.
[25] Who among the following evolved the concept of relationship between mass and energy?
A.
Einstein
B.
Planck
C.
Dalton
D.
Rutherford
Ans:
Einstein
Explanation :
Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics.
Explanation :
The blue colour of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky.
[10] The device used to convert solar energy into electricity is –
A.
Photovoltaic cell
B.
Daniell cell
C.
Electrochemical cell
D.
Galvanic cell
Ans:
Photovoltaic cell
Explanation :
Sunlight is converted into electricity using photovoltaics (PV). A photovoltaic system employs solar panels composed of a number of solar cells to supply usable solar power.
[11] If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same -
A.
velocity
B.
momentum
C.
acceleration
D.
kinetic energy
Ans:
momentum
Explanation :
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same momentum.
[12] The absorption of ink by blotting paper involves -
A.
capillary action phenomenon
B.
viscosity of ink
C.
siphon action
D.
diffusion of ink through the blotting
Ans:
capillary action phenomenon
Explanation :
The ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.
[13] A fuse wire is made of:
A.
an alloy of tin and copper
B.
an alloy of tin and lead
C.
an alloy of tin and aluminium
D.
an alloy of nickel and chromium
Ans:
an alloy of tin and lead
Explanation :
Electric fuse wire is an alloy made of tin (63 % lead 37 %. The cross sectional area determines the melting point at a certain current. Alloys (e.g. tin/ lead) are used due to their 'eutectic' action -i.e. the resulting combination of good conductivity (due to the tin) with a low melting point due to the lead).
[14] Ultra violet light of Sun's radiation is prevented from reaching the earth's atmosphere by the layer of –
A.
Oxygen
B.
Hydrogen
C.
Ozone
D.
Helium
Ans:
Ozone
Explanation :
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03). The layer absorbs 97-99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth.
[15] Which instrument is used to measure depth of ocean?
A.
Galvanometer
B.
Fluxmeter
C.
Endoscope
D.
Fathometer
Ans:
Fathometer
Explanation :
Galvanometer - measures electric current, Fluxmeter - measures magnetic flux, Endoscope - used to examine internal parts of the body.
[16] When a running car stops suddenly, the passengers tends to lean forward because of:
A.
centrifugal force
B.
inertia of rest
C.
inertia of motion
D.
gravitational force
Ans:
inertia of motion
Explanation :
When a running car stops suddenly, the passengers tend to lean forward due to inertia of motion. Inertia is that property of a body due to which it resists a change in its state of rest or of uniform motion.
[17] Why the Earth is having its own atmosphere?
A.
Winds
B.
Clouds
C.
Gravity
D.
Rotation of the Earth
Ans:
Gravity
Explanation :
Due to gravity, our Earth has an atmosphere. Gravity causes the gases to be held close to the earth instead of escaping into outer space. Besides, gravity makes the atmosphere denser closer to the Earth – the upper layers push down against the lower layers.
[18] A ray of white light strikes the surface of an object. If all the colours are reflected, the surface would appear
A.
Black
B.
White
C.
Grey
D.
Opaque
Ans:
White
Explanation :
Objects do not have any colour of their own. When light hits a surface, some of it is absorbed and some of it is reflected. The light that is reflected is the colour of the object in that light. Objects appear white when they reflect all the wavelengths; they appear black when they absorb all visible wavelengths.
[19] It is difficult to walk on ice because of .
A.
absence of friction
B.
less inertia
C.
more inertia
D.
more mass
Ans:
absence of friction
Explanation :
It's difficult to walk on ice because there's very little friction between the bottoms of your shoes and the ice. Friction is a force that opposes motion.
[20] One bar is equal to –
A.
10³ Pa
B.
1003 Pa
C.
10⁵ Pa
D.
10⁴ Pa
Ans:
10⁵ Pa
Explanation :
The bar is a non-Si unit of pressure. It is defined by the IUPAC as exactly equal to 100,000 Pa or 1O Pa.
[21] A NOT gate can be implemented by:
A.
a single diode
B.
two diodes
C.
a single resistor
D.
a single transistor
Ans:
a single transistor
Explanation :
In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. An inverter circuit outputs a voltage representing the opposite logic-level to its input. Inverters can be constructed using a single NMOS transistor or a single PMOS transistor coupled with a resistor.
[22] Persistence of vision is the Principle behind:
A.
Binocular
B.
Cinema
C.
Periscope
D.
Camera
Ans:
Cinema
Explanation :
Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. In the early days of cinema, it was scientifically determined that a frame rate of less than 16 frames per second (frame/s) caused the mind to see flashing images.
[23] Sudden fall in barometer is indication of -
A.
Storm
B.
Rain
C.
Tide
D.
Clear weather
Ans:
Tide
Explanation :
Sudden fall in barometer is indication of Storm. A barometer measures air pressure: A "rising" barometer indicates increasing air pressure; a "falling" barometer indicates decreasing air pressure.
[24] If in a motion, the axis of the rotation does not pass through the object, then the motion is called -
A.
Spin motion
B.
Oscillatory motion
C.
Translatory motion
D.
Orbital motion
Ans:
Orbital motion
Explanation :
The axis of the rotation does not pass through the object in orbital motion. It involves the quantum mechanical motion of rigid particles (such as electrons) about some other mass, or about themselves.
[25] Who among the following evolved the concept of relationship between mass and energy?
A.
Einstein
B.
Planck
C.
Dalton
D.
Rutherford
Ans:
Einstein
Explanation :
Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics.
Explanation :
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same momentum.
[12] The absorption of ink by blotting paper involves -
A.
capillary action phenomenon
B.
viscosity of ink
C.
siphon action
D.
diffusion of ink through the blotting
Ans:
capillary action phenomenon
Explanation :
The ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.
[13] A fuse wire is made of:
A.
an alloy of tin and copper
B.
an alloy of tin and lead
C.
an alloy of tin and aluminium
D.
an alloy of nickel and chromium
Ans:
an alloy of tin and lead
Explanation :
Electric fuse wire is an alloy made of tin (63 % lead 37 %. The cross sectional area determines the melting point at a certain current. Alloys (e.g. tin/ lead) are used due to their 'eutectic' action -i.e. the resulting combination of good conductivity (due to the tin) with a low melting point due to the lead).
[14] Ultra violet light of Sun's radiation is prevented from reaching the earth's atmosphere by the layer of –
A.
Oxygen
B.
Hydrogen
C.
Ozone
D.
Helium
Ans:
Ozone
Explanation :
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03). The layer absorbs 97-99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth.
[15] Which instrument is used to measure depth of ocean?
A.
Galvanometer
B.
Fluxmeter
C.
Endoscope
D.
Fathometer
Ans:
Fathometer
Explanation :
Galvanometer - measures electric current, Fluxmeter - measures magnetic flux, Endoscope - used to examine internal parts of the body.
[16] When a running car stops suddenly, the passengers tends to lean forward because of:
A.
centrifugal force
B.
inertia of rest
C.
inertia of motion
D.
gravitational force
Ans:
inertia of motion
Explanation :
When a running car stops suddenly, the passengers tend to lean forward due to inertia of motion. Inertia is that property of a body due to which it resists a change in its state of rest or of uniform motion.
[17] Why the Earth is having its own atmosphere?
A.
Winds
B.
Clouds
C.
Gravity
D.
Rotation of the Earth
Ans:
Gravity
Explanation :
Due to gravity, our Earth has an atmosphere. Gravity causes the gases to be held close to the earth instead of escaping into outer space. Besides, gravity makes the atmosphere denser closer to the Earth – the upper layers push down against the lower layers.
[18] A ray of white light strikes the surface of an object. If all the colours are reflected, the surface would appear
A.
Black
B.
White
C.
Grey
D.
Opaque
Ans:
White
Explanation :
Objects do not have any colour of their own. When light hits a surface, some of it is absorbed and some of it is reflected. The light that is reflected is the colour of the object in that light. Objects appear white when they reflect all the wavelengths; they appear black when they absorb all visible wavelengths.
[19] It is difficult to walk on ice because of .
A.
absence of friction
B.
less inertia
C.
more inertia
D.
more mass
Ans:
absence of friction
Explanation :
It's difficult to walk on ice because there's very little friction between the bottoms of your shoes and the ice. Friction is a force that opposes motion.
[20] One bar is equal to –
A.
10³ Pa
B.
1003 Pa
C.
10⁵ Pa
D.
10⁴ Pa
Ans:
10⁵ Pa
Explanation :
The bar is a non-Si unit of pressure. It is defined by the IUPAC as exactly equal to 100,000 Pa or 1O Pa.
[21] A NOT gate can be implemented by:
A.
a single diode
B.
two diodes
C.
a single resistor
D.
a single transistor
Ans:
a single transistor
Explanation :
In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. An inverter circuit outputs a voltage representing the opposite logic-level to its input. Inverters can be constructed using a single NMOS transistor or a single PMOS transistor coupled with a resistor.
[22] Persistence of vision is the Principle behind:
A.
Binocular
B.
Cinema
C.
Periscope
D.
Camera
Ans:
Cinema
Explanation :
Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. In the early days of cinema, it was scientifically determined that a frame rate of less than 16 frames per second (frame/s) caused the mind to see flashing images.
[23] Sudden fall in barometer is indication of -
A.
Storm
B.
Rain
C.
Tide
D.
Clear weather
Ans:
Tide
Explanation :
Sudden fall in barometer is indication of Storm. A barometer measures air pressure: A "rising" barometer indicates increasing air pressure; a "falling" barometer indicates decreasing air pressure.
[24] If in a motion, the axis of the rotation does not pass through the object, then the motion is called -
A.
Spin motion
B.
Oscillatory motion
C.
Translatory motion
D.
Orbital motion
Ans:
Orbital motion
Explanation :
The axis of the rotation does not pass through the object in orbital motion. It involves the quantum mechanical motion of rigid particles (such as electrons) about some other mass, or about themselves.
[25] Who among the following evolved the concept of relationship between mass and energy?
A.
Einstein
B.
Planck
C.
Dalton
D.
Rutherford
Ans:
Einstein
Explanation :
Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics.
Explanation :
Electric fuse wire is an alloy made of tin (63 % lead 37 %. The cross sectional area determines the melting point at a certain current. Alloys (e.g. tin/ lead) are used due to their 'eutectic' action -i.e. the resulting combination of good conductivity (due to the tin) with a low melting point due to the lead).
[14] Ultra violet light of Sun's radiation is prevented from reaching the earth's atmosphere by the layer of –
A.
Oxygen
B.
Hydrogen
C.
Ozone
D.
Helium
Ans:
Ozone
Explanation :
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03). The layer absorbs 97-99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth.
[15] Which instrument is used to measure depth of ocean?
A.
Galvanometer
B.
Fluxmeter
C.
Endoscope
D.
Fathometer
Ans:
Fathometer
Explanation :
Galvanometer - measures electric current, Fluxmeter - measures magnetic flux, Endoscope - used to examine internal parts of the body.
[16] When a running car stops suddenly, the passengers tends to lean forward because of:
A.
centrifugal force
B.
inertia of rest
C.
inertia of motion
D.
gravitational force
Ans:
inertia of motion
Explanation :
When a running car stops suddenly, the passengers tend to lean forward due to inertia of motion. Inertia is that property of a body due to which it resists a change in its state of rest or of uniform motion.
[17] Why the Earth is having its own atmosphere?
A.
Winds
B.
Clouds
C.
Gravity
D.
Rotation of the Earth
Ans:
Gravity
Explanation :
Due to gravity, our Earth has an atmosphere. Gravity causes the gases to be held close to the earth instead of escaping into outer space. Besides, gravity makes the atmosphere denser closer to the Earth – the upper layers push down against the lower layers.
[18] A ray of white light strikes the surface of an object. If all the colours are reflected, the surface would appear
A.
Black
B.
White
C.
Grey
D.
Opaque
Ans:
White
Explanation :
Objects do not have any colour of their own. When light hits a surface, some of it is absorbed and some of it is reflected. The light that is reflected is the colour of the object in that light. Objects appear white when they reflect all the wavelengths; they appear black when they absorb all visible wavelengths.
[19] It is difficult to walk on ice because of .
A.
absence of friction
B.
less inertia
C.
more inertia
D.
more mass
Ans:
absence of friction
Explanation :
It's difficult to walk on ice because there's very little friction between the bottoms of your shoes and the ice. Friction is a force that opposes motion.
[20] One bar is equal to –
A.
10³ Pa
B.
1003 Pa
C.
10⁵ Pa
D.
10⁴ Pa
Ans:
10⁵ Pa
Explanation :
The bar is a non-Si unit of pressure. It is defined by the IUPAC as exactly equal to 100,000 Pa or 1O Pa.
[21] A NOT gate can be implemented by:
A.
a single diode
B.
two diodes
C.
a single resistor
D.
a single transistor
Ans:
a single transistor
Explanation :
In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. An inverter circuit outputs a voltage representing the opposite logic-level to its input. Inverters can be constructed using a single NMOS transistor or a single PMOS transistor coupled with a resistor.
[22] Persistence of vision is the Principle behind:
A.
Binocular
B.
Cinema
C.
Periscope
D.
Camera
Ans:
Cinema
Explanation :
Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. In the early days of cinema, it was scientifically determined that a frame rate of less than 16 frames per second (frame/s) caused the mind to see flashing images.
[23] Sudden fall in barometer is indication of -
A.
Storm
B.
Rain
C.
Tide
D.
Clear weather
Ans:
Tide
Explanation :
Sudden fall in barometer is indication of Storm. A barometer measures air pressure: A "rising" barometer indicates increasing air pressure; a "falling" barometer indicates decreasing air pressure.
[24] If in a motion, the axis of the rotation does not pass through the object, then the motion is called -
A.
Spin motion
B.
Oscillatory motion
C.
Translatory motion
D.
Orbital motion
Ans:
Orbital motion
Explanation :
The axis of the rotation does not pass through the object in orbital motion. It involves the quantum mechanical motion of rigid particles (such as electrons) about some other mass, or about themselves.
[25] Who among the following evolved the concept of relationship between mass and energy?
A.
Einstein
B.
Planck
C.
Dalton
D.
Rutherford
Ans:
Einstein
Explanation :
Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics.
Explanation :
Galvanometer - measures electric current, Fluxmeter - measures magnetic flux, Endoscope - used to examine internal parts of the body.
[16] When a running car stops suddenly, the passengers tends to lean forward because of:
A.
centrifugal force
B.
inertia of rest
C.
inertia of motion
D.
gravitational force
Ans:
inertia of motion
Explanation :
When a running car stops suddenly, the passengers tend to lean forward due to inertia of motion. Inertia is that property of a body due to which it resists a change in its state of rest or of uniform motion.
[17] Why the Earth is having its own atmosphere?
A.
Winds
B.
Clouds
C.
Gravity
D.
Rotation of the Earth
Ans:
Gravity
Explanation :
Due to gravity, our Earth has an atmosphere. Gravity causes the gases to be held close to the earth instead of escaping into outer space. Besides, gravity makes the atmosphere denser closer to the Earth – the upper layers push down against the lower layers.
[18] A ray of white light strikes the surface of an object. If all the colours are reflected, the surface would appear
A.
Black
B.
White
C.
Grey
D.
Opaque
Ans:
White
Explanation :
Objects do not have any colour of their own. When light hits a surface, some of it is absorbed and some of it is reflected. The light that is reflected is the colour of the object in that light. Objects appear white when they reflect all the wavelengths; they appear black when they absorb all visible wavelengths.
[19] It is difficult to walk on ice because of .
A.
absence of friction
B.
less inertia
C.
more inertia
D.
more mass
Ans:
absence of friction
Explanation :
It's difficult to walk on ice because there's very little friction between the bottoms of your shoes and the ice. Friction is a force that opposes motion.
[20] One bar is equal to –
A.
10³ Pa
B.
1003 Pa
C.
10⁵ Pa
D.
10⁴ Pa
Ans:
10⁵ Pa
Explanation :
The bar is a non-Si unit of pressure. It is defined by the IUPAC as exactly equal to 100,000 Pa or 1O Pa.
[21] A NOT gate can be implemented by:
A.
a single diode
B.
two diodes
C.
a single resistor
D.
a single transistor
Ans:
a single transistor
Explanation :
In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. An inverter circuit outputs a voltage representing the opposite logic-level to its input. Inverters can be constructed using a single NMOS transistor or a single PMOS transistor coupled with a resistor.
[22] Persistence of vision is the Principle behind:
A.
Binocular
B.
Cinema
C.
Periscope
D.
Camera
Ans:
Cinema
Explanation :
Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. In the early days of cinema, it was scientifically determined that a frame rate of less than 16 frames per second (frame/s) caused the mind to see flashing images.
[23] Sudden fall in barometer is indication of -
A.
Storm
B.
Rain
C.
Tide
D.
Clear weather
Ans:
Tide
Explanation :
Sudden fall in barometer is indication of Storm. A barometer measures air pressure: A "rising" barometer indicates increasing air pressure; a "falling" barometer indicates decreasing air pressure.
[24] If in a motion, the axis of the rotation does not pass through the object, then the motion is called -
A.
Spin motion
B.
Oscillatory motion
C.
Translatory motion
D.
Orbital motion
Ans:
Orbital motion
Explanation :
The axis of the rotation does not pass through the object in orbital motion. It involves the quantum mechanical motion of rigid particles (such as electrons) about some other mass, or about themselves.
[25] Who among the following evolved the concept of relationship between mass and energy?
A.
Einstein
B.
Planck
C.
Dalton
D.
Rutherford
Ans:
Einstein
Explanation :
Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics.
Explanation :
Due to gravity, our Earth has an atmosphere. Gravity causes the gases to be held close to the earth instead of escaping into outer space. Besides, gravity makes the atmosphere denser closer to the Earth – the upper layers push down against the lower layers.
[18] A ray of white light strikes the surface of an object. If all the colours are reflected, the surface would appear
A.
Black
B.
White
C.
Grey
D.
Opaque
Ans:
White
Explanation :
Objects do not have any colour of their own. When light hits a surface, some of it is absorbed and some of it is reflected. The light that is reflected is the colour of the object in that light. Objects appear white when they reflect all the wavelengths; they appear black when they absorb all visible wavelengths.
[19] It is difficult to walk on ice because of .
A.
absence of friction
B.
less inertia
C.
more inertia
D.
more mass
Ans:
absence of friction
Explanation :
It's difficult to walk on ice because there's very little friction between the bottoms of your shoes and the ice. Friction is a force that opposes motion.
[20] One bar is equal to –
A.
10³ Pa
B.
1003 Pa
C.
10⁵ Pa
D.
10⁴ Pa
Ans:
10⁵ Pa
Explanation :
The bar is a non-Si unit of pressure. It is defined by the IUPAC as exactly equal to 100,000 Pa or 1O Pa.
[21] A NOT gate can be implemented by:
A.
a single diode
B.
two diodes
C.
a single resistor
D.
a single transistor
Ans:
a single transistor
Explanation :
In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. An inverter circuit outputs a voltage representing the opposite logic-level to its input. Inverters can be constructed using a single NMOS transistor or a single PMOS transistor coupled with a resistor.
[22] Persistence of vision is the Principle behind:
A.
Binocular
B.
Cinema
C.
Periscope
D.
Camera
Ans:
Cinema
Explanation :
Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. In the early days of cinema, it was scientifically determined that a frame rate of less than 16 frames per second (frame/s) caused the mind to see flashing images.
[23] Sudden fall in barometer is indication of -
A.
Storm
B.
Rain
C.
Tide
D.
Clear weather
Ans:
Tide
Explanation :
Sudden fall in barometer is indication of Storm. A barometer measures air pressure: A "rising" barometer indicates increasing air pressure; a "falling" barometer indicates decreasing air pressure.
[24] If in a motion, the axis of the rotation does not pass through the object, then the motion is called -
A.
Spin motion
B.
Oscillatory motion
C.
Translatory motion
D.
Orbital motion
Ans:
Orbital motion
Explanation :
The axis of the rotation does not pass through the object in orbital motion. It involves the quantum mechanical motion of rigid particles (such as electrons) about some other mass, or about themselves.
[25] Who among the following evolved the concept of relationship between mass and energy?
A.
Einstein
B.
Planck
C.
Dalton
D.
Rutherford
Ans:
Einstein
Explanation :
Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics.
Explanation :
It's difficult to walk on ice because there's very little friction between the bottoms of your shoes and the ice. Friction is a force that opposes motion.
[20] One bar is equal to –
A.
10³ Pa
B.
1003 Pa
C.
10⁵ Pa
D.
10⁴ Pa
Ans:
10⁵ Pa
Explanation :
The bar is a non-Si unit of pressure. It is defined by the IUPAC as exactly equal to 100,000 Pa or 1O Pa.
[21] A NOT gate can be implemented by:
A.
a single diode
B.
two diodes
C.
a single resistor
D.
a single transistor
Ans:
a single transistor
Explanation :
In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. An inverter circuit outputs a voltage representing the opposite logic-level to its input. Inverters can be constructed using a single NMOS transistor or a single PMOS transistor coupled with a resistor.
[22] Persistence of vision is the Principle behind:
A.
Binocular
B.
Cinema
C.
Periscope
D.
Camera
Ans:
Cinema
Explanation :
Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. In the early days of cinema, it was scientifically determined that a frame rate of less than 16 frames per second (frame/s) caused the mind to see flashing images.
[23] Sudden fall in barometer is indication of -
A.
Storm
B.
Rain
C.
Tide
D.
Clear weather
Ans:
Tide
Explanation :
Sudden fall in barometer is indication of Storm. A barometer measures air pressure: A "rising" barometer indicates increasing air pressure; a "falling" barometer indicates decreasing air pressure.
[24] If in a motion, the axis of the rotation does not pass through the object, then the motion is called -
A.
Spin motion
B.
Oscillatory motion
C.
Translatory motion
D.
Orbital motion
Ans:
Orbital motion
Explanation :
The axis of the rotation does not pass through the object in orbital motion. It involves the quantum mechanical motion of rigid particles (such as electrons) about some other mass, or about themselves.
[25] Who among the following evolved the concept of relationship between mass and energy?
A.
Einstein
B.
Planck
C.
Dalton
D.
Rutherford
Ans:
Einstein
Explanation :
Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics.
Explanation :
In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. An inverter circuit outputs a voltage representing the opposite logic-level to its input. Inverters can be constructed using a single NMOS transistor or a single PMOS transistor coupled with a resistor.
[22] Persistence of vision is the Principle behind:
A.
Binocular
B.
Cinema
C.
Periscope
D.
Camera
Ans:
Cinema
Explanation :
Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. In the early days of cinema, it was scientifically determined that a frame rate of less than 16 frames per second (frame/s) caused the mind to see flashing images.
[23] Sudden fall in barometer is indication of -
A.
Storm
B.
Rain
C.
Tide
D.
Clear weather
Ans:
Tide
Explanation :
Sudden fall in barometer is indication of Storm. A barometer measures air pressure: A "rising" barometer indicates increasing air pressure; a "falling" barometer indicates decreasing air pressure.
[24] If in a motion, the axis of the rotation does not pass through the object, then the motion is called -
A.
Spin motion
B.
Oscillatory motion
C.
Translatory motion
D.
Orbital motion
Ans:
Orbital motion
Explanation :
The axis of the rotation does not pass through the object in orbital motion. It involves the quantum mechanical motion of rigid particles (such as electrons) about some other mass, or about themselves.
[25] Who among the following evolved the concept of relationship between mass and energy?
A.
Einstein
B.
Planck
C.
Dalton
D.
Rutherford
Ans:
Einstein
Explanation :
Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics.
Explanation :
Sudden fall in barometer is indication of Storm. A barometer measures air pressure: A "rising" barometer indicates increasing air pressure; a "falling" barometer indicates decreasing air pressure.
[24] If in a motion, the axis of the rotation does not pass through the object, then the motion is called -
A.
Spin motion
B.
Oscillatory motion
C.
Translatory motion
D.
Orbital motion
Ans:
Orbital motion
Explanation :
The axis of the rotation does not pass through the object in orbital motion. It involves the quantum mechanical motion of rigid particles (such as electrons) about some other mass, or about themselves.
[25] Who among the following evolved the concept of relationship between mass and energy?
A.
Einstein
B.
Planck
C.
Dalton
D.
Rutherford
Ans:
Einstein
Explanation :
Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics.
Explanation :
Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics.