[1] The period of revolution of a geostationary satellite is –
A.
365 days
B.
30 days
C.
24 hours
D.
changing continuously
Ans:
24 hours
Explanation :
A geosynchronous satellite is a satellite in geosynchronous orbit, with an orbital period the same as the Earth's rotation period. Such a satellite returns to the same position in the sky after each sidereal day, and over the course of a day traces out a path in the sky. A special case of geosynchronous satellite is the geostationary satellite, which has a geostationary orbit - a circular geosynchronous orbit directly above the Earth's equator.
[2] The device which converts sound energy into electrical enemy is called –
A.
Amplifier
B.
Speaker
C.
Microphone
D.
Transmitter
Ans:
Microphone
Explanation :
A microphone converts sound energy to electrical energy this energy level is used as an output using same energy level, amplified or it could be used to record those same energy output and pattern too be played again. Sound 'waves strike a plastic or thin metal diaphragm, causing in to move an attached coil within a strong magnetic field. The induced current duplicates the frequency of the sound wave.
[3] The light rays used for eliminating bacteria –
A.
X-rays
B.
infrared rays
C.
microwave radiation
D.
ultra-violet radiation
Ans:
ultra-violet radiation
Explanation :
Ultraviolet radiation is used to kill microorganisms, molds and fungus in various environmental applications. UV sterilization is used for air-purification systems, water purification, aquarium and pond maintenance, laboratory hygiene and food and beverage protection.
[4] The audio signals of TV are –
A.
Amplitude modulated
B.
Frequency modulated
C.
Unmodulated
D.
Velocity modulated
Ans:
Frequency modulated
Explanation :
In analogue television, the sound portion of a broadcast is invariably modulated separately from the video. Most commonly, the audio and video are combined at the transmitter before being presented to the antenna, but in some cases separate aural and visual antennas can be used. In almost all cases, standard wideband frequency modulation is used.
[5] Red light is used for signals because it has –
A.
long wavelength
B.
high intensity
C.
high frequency
D.
low refraction in the medium
Ans:
long wavelength
Explanation :
Red is the international colour of stop signs and stop lights on highways and intersections because it is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a colour. Red has the highest wavelength of all the colours and is able to travel the longest distance through fog, rain, and the alike.
[6] The washing machine works on the principle of -
A.
Dialysis
B.
Diffusion
C.
Reverse osmosis
D.
Centrifugation
Ans:
Centrifugation
Explanation :
Washing machines work on the principle of centrifugation. They are based on medium sized centrifuges that put an object in rotation around a fixed axis, applying force perpendicular to the axis. It uses the sedimentation principle, where the centripetal acceleration separates substances of greater and lesser density. Besides, it also makes use of the centrifugal force generated in the “spin cycle” of washing machines that throws the water out through the little holes of perforated drum so that the washed clothes end up much drier.
[7] Which zone of a candle flame is the hottest?
A.
Dark innermost zone
B.
Outermost zone
C.
Middle luminous zone
D.
Central zone
Ans:
Middle luminous zone
Explanation :
The outermost zone of the flame is blue in colour and it is the hottest part. The innermost zone is the least hot and black in colour.
[8] 'Hydraulic brakes' work on the principle of –
A.
Pascal's law
B.
Thomson's law
C.
Newton's law
D.
Bernoulli's theorem
Ans:
Pascal's law
Explanation :
Pascal's law states that when there is an increase in pressure at any point in a confined fluid, there is an equal increase at every other point in the container. According to Pascal's principle, in a hydraulic system a pressure exerted on a piston produces an equal increase in pressure on another piston in the system.
[9] The instrument for measuring intensity of earthquakes is called –
A.
Ediograph
B.
Pantagraph
C.
Ergograph
D.
Seismograph
Ans:
Seismograph
Explanation :
Seismometers are instrument that measures motion of the ground, including those of seismic waves generated by earthquakes, volcanic eruptions and other seismic sources. Records of seismic waves allow seismologists to map the interior of the earth and locate and measure the size of these different sources. Seismograph is another Greek term meaning to draw seismic waves.
[10] Which one of the following animals can hear ultrasonic sound?
A.
Rat
B.
Squirrel
C.
Cat
D.
Bat
Ans:
Bat
Explanation :
Ultrasound is a cyclic sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasound is thus not separated from "normal" (audible) sound based on differences in physical properties, only the fact that humans cannot hear it.
[11] ‘Therm' is the unit of –
A.
Power
B.
Heat
C.
Light
D.
Distance
Ans:
Heat
Explanation :
Therm is a non-SI unit of heat energy equal to 100,000 British thermal units (BTU). It is approximately the enemy equivalent of burning 100 cubic feet (often referred to as 1 CCF) of natural gas. Since (Natural Gas) meters measure volume and not energy content, a therm factor is used by (Natural) gas companies to convert the volume of gas used to its heat equivalent, and thus calculate the actual energy use.
[12] Newton's first law of motion gives the concept of –
A.
Energy
B.
Work
C.
Momentum
D.
Inertia
Ans:
Inertia
Explanation :
Newton's laws of motion are three physical laws that form the basis for classical mechanics. They describe the relationship between the forces acting on a body and its motion due to those forces. The first law states that if the net force (the vector sum of all forces acting on an object) is zero, then the velocity of the object is constant. Newton's first law is often referred to as the law of inertia.
[13] When heated from 0° to 10°C volume of a given mass of water will -
A.
Increase gradually
B.
Decrease gradually
C.
Increase and after will decrease
D.
Decrease and after will increase
Ans:
Decrease and after will increase
Explanation :
As water has maximum density at 40C. So going from 00C to 100C. First its volume decreases upto 40C, making density maximum and then increases to lower the density again.
[14] Which of the following is an example for cantilever beam?
A.
Diving board
B.
Bridge
C.
See-saw
D.
Common balance
Ans:
Bridge
Explanation :
A cantilever is a beam anchored at only one end. The beam carries the load to the support where it is resisted by moment and shear stress. Cantilever construction allows for overhanging structures without external bracing. Cantilevers can also be constructed with trusses or slabs. This is in contrast to a simply supported beam such as those found in a post and lintel system. A simply supported beam is supported at both ends with loads applied between the supports. Cantilevers are widely found in construction, notably in cantilever bridges.
[15] It is difficult to cook rice –
A.
at the top of a mountain
B.
at the sea level
C.
under a mine
D.
same anywhere
Ans:
at the top of a mountain
Explanation :
On a mountain top the air pressure is a little lower. At higher elevations, water boils at a little lower temp than 100 degrees C. On a mountain top cooking takes longer, because it is like cooking on medium heat, instead of leaving the burner on high. Either way it will cook, one will take longer than the other. The boiling point of water in mountainous areas is lower because of a decreased air pressure (compared to sea level) at higher altitudes.
[16] Angle of friction and angle of repose are –
A.
Equal to each other
B.
Not equal to each other
C.
Proportional to each other
D.
None of the above
Ans:
Equal to each other
Explanation :
The angle of repose or the critical angle of repose, of a granular material is the steepest angle of descent or dip of the slope relative to the horizontal plane when material on the slope face is on the verge of sliding. This angle is in the range 0°-90° .when bulk granular materials are poured onto a horizontal surface, a conical pile will form. The internal angle between the surface of the pile and the horizontal surface is known as the angle of repose and is related to the density, surface area and shapes of the particles, and the coefficient of friction of the material.
[17] If a boy sitting in a train, which is moving at a constant velocity, throws a ball straight up into the air, the ball will –
A.
Fall in front of him
B.
Fall behind him
C.
Fall into his hand
D.
None of the above
Ans:
Fall into his hand
Explanation :
If a person throws a ball vertically upwards in a moving train, it comes back to his hand. The moment the ball was thrown, the ball was also in motion alone with the person who had thrown the ball and the train. This is due to inertia of motion. So when the ball remains in the air, both the person and the ball move ahead by the same distance. This makes the ball to come back to his hand on its return.
[18] A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?
A.
Increase
B.
Decrease
C.
Remain constant
D.
Will increase first and then decrease
Ans:
Increase
Explanation :
Assuming the disc is uniform and isotropic (the same in different directions), the hole will expand in the same ratio as the metal. It is because the thermal expansion equation applies to all lengths associated with the metal, including the circumference of the hole, since the edge of the hole is made out of metal. And if the circumference of the hole expands, so does the diameter.
[19] Stars in the sky appear to twinkle due to –
A.
a series of refractions
B.
a series of reflections
C.
a surface tension phenomenon
D.
multiple diminishing brightness
Ans:
a series of refractions
Explanation :
The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. This means that some of the light reaches us directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.
[20] A pilot has to release the bomb to hit a target –
A.
right above the target
B.
beyond the target
C.
before the target
D.
None of these
Ans:
before the target
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it.
[21] Parabolic mirros are used in –
A.
Car headlights
B.
Driving mirrors
C.
Dentists mirros
D.
Shaving mirros
Ans:
Car headlights
Explanation :
A parabolic reflector (mirror) transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. Since the principles of reflection are reversible, parabolic reflectors can also be used to project energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights.
[22] Which atmospheric layer contains ozone layer?
A.
Genosphere
B.
Zonosphere
C.
Stratosphere
D.
Ionosphere
Ans:
Stratosphere
Explanation :
The ozone (O2) found in upper part of the atmosphere, i.e., Stratosphere, is Good ozone, since, it acts as a shield for absorbing UV-radiations from sun.
[23] Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid:
A.
increases
B.
decreases
C.
stays the same
D.
none of the above
Ans:
increases
Explanation :
0
[24] Which of the following is the best conductor of Electricity?
A.
Ordinary water
B.
Sea water
C.
Boiled water
D.
Distilled water
Ans:
Sea water
Explanation :
It sounds crazy, but it's true! This is because Sea water has Salt that is a good conductor of electricity. Salt molecules are made of sodium ions and chlorine ions.
[25] Rate of change of momentum is -
A.
Area
B.
Pressure
C.
Force
D.
Velocity
Ans:
Force
Explanation :
According to Newton’s Second Law of motion, the rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force.
Explanation :
A geosynchronous satellite is a satellite in geosynchronous orbit, with an orbital period the same as the Earth's rotation period. Such a satellite returns to the same position in the sky after each sidereal day, and over the course of a day traces out a path in the sky. A special case of geosynchronous satellite is the geostationary satellite, which has a geostationary orbit - a circular geosynchronous orbit directly above the Earth's equator.
[2] The device which converts sound energy into electrical enemy is called –
A.
Amplifier
B.
Speaker
C.
Microphone
D.
Transmitter
Ans:
Microphone
Explanation :
A microphone converts sound energy to electrical energy this energy level is used as an output using same energy level, amplified or it could be used to record those same energy output and pattern too be played again. Sound 'waves strike a plastic or thin metal diaphragm, causing in to move an attached coil within a strong magnetic field. The induced current duplicates the frequency of the sound wave.
[3] The light rays used for eliminating bacteria –
A.
X-rays
B.
infrared rays
C.
microwave radiation
D.
ultra-violet radiation
Ans:
ultra-violet radiation
Explanation :
Ultraviolet radiation is used to kill microorganisms, molds and fungus in various environmental applications. UV sterilization is used for air-purification systems, water purification, aquarium and pond maintenance, laboratory hygiene and food and beverage protection.
[4] The audio signals of TV are –
A.
Amplitude modulated
B.
Frequency modulated
C.
Unmodulated
D.
Velocity modulated
Ans:
Frequency modulated
Explanation :
In analogue television, the sound portion of a broadcast is invariably modulated separately from the video. Most commonly, the audio and video are combined at the transmitter before being presented to the antenna, but in some cases separate aural and visual antennas can be used. In almost all cases, standard wideband frequency modulation is used.
[5] Red light is used for signals because it has –
A.
long wavelength
B.
high intensity
C.
high frequency
D.
low refraction in the medium
Ans:
long wavelength
Explanation :
Red is the international colour of stop signs and stop lights on highways and intersections because it is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a colour. Red has the highest wavelength of all the colours and is able to travel the longest distance through fog, rain, and the alike.
[6] The washing machine works on the principle of -
A.
Dialysis
B.
Diffusion
C.
Reverse osmosis
D.
Centrifugation
Ans:
Centrifugation
Explanation :
Washing machines work on the principle of centrifugation. They are based on medium sized centrifuges that put an object in rotation around a fixed axis, applying force perpendicular to the axis. It uses the sedimentation principle, where the centripetal acceleration separates substances of greater and lesser density. Besides, it also makes use of the centrifugal force generated in the “spin cycle” of washing machines that throws the water out through the little holes of perforated drum so that the washed clothes end up much drier.
[7] Which zone of a candle flame is the hottest?
A.
Dark innermost zone
B.
Outermost zone
C.
Middle luminous zone
D.
Central zone
Ans:
Middle luminous zone
Explanation :
The outermost zone of the flame is blue in colour and it is the hottest part. The innermost zone is the least hot and black in colour.
[8] 'Hydraulic brakes' work on the principle of –
A.
Pascal's law
B.
Thomson's law
C.
Newton's law
D.
Bernoulli's theorem
Ans:
Pascal's law
Explanation :
Pascal's law states that when there is an increase in pressure at any point in a confined fluid, there is an equal increase at every other point in the container. According to Pascal's principle, in a hydraulic system a pressure exerted on a piston produces an equal increase in pressure on another piston in the system.
[9] The instrument for measuring intensity of earthquakes is called –
A.
Ediograph
B.
Pantagraph
C.
Ergograph
D.
Seismograph
Ans:
Seismograph
Explanation :
Seismometers are instrument that measures motion of the ground, including those of seismic waves generated by earthquakes, volcanic eruptions and other seismic sources. Records of seismic waves allow seismologists to map the interior of the earth and locate and measure the size of these different sources. Seismograph is another Greek term meaning to draw seismic waves.
[10] Which one of the following animals can hear ultrasonic sound?
A.
Rat
B.
Squirrel
C.
Cat
D.
Bat
Ans:
Bat
Explanation :
Ultrasound is a cyclic sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasound is thus not separated from "normal" (audible) sound based on differences in physical properties, only the fact that humans cannot hear it.
[11] ‘Therm' is the unit of –
A.
Power
B.
Heat
C.
Light
D.
Distance
Ans:
Heat
Explanation :
Therm is a non-SI unit of heat energy equal to 100,000 British thermal units (BTU). It is approximately the enemy equivalent of burning 100 cubic feet (often referred to as 1 CCF) of natural gas. Since (Natural Gas) meters measure volume and not energy content, a therm factor is used by (Natural) gas companies to convert the volume of gas used to its heat equivalent, and thus calculate the actual energy use.
[12] Newton's first law of motion gives the concept of –
A.
Energy
B.
Work
C.
Momentum
D.
Inertia
Ans:
Inertia
Explanation :
Newton's laws of motion are three physical laws that form the basis for classical mechanics. They describe the relationship between the forces acting on a body and its motion due to those forces. The first law states that if the net force (the vector sum of all forces acting on an object) is zero, then the velocity of the object is constant. Newton's first law is often referred to as the law of inertia.
[13] When heated from 0° to 10°C volume of a given mass of water will -
A.
Increase gradually
B.
Decrease gradually
C.
Increase and after will decrease
D.
Decrease and after will increase
Ans:
Decrease and after will increase
Explanation :
As water has maximum density at 40C. So going from 00C to 100C. First its volume decreases upto 40C, making density maximum and then increases to lower the density again.
[14] Which of the following is an example for cantilever beam?
A.
Diving board
B.
Bridge
C.
See-saw
D.
Common balance
Ans:
Bridge
Explanation :
A cantilever is a beam anchored at only one end. The beam carries the load to the support where it is resisted by moment and shear stress. Cantilever construction allows for overhanging structures without external bracing. Cantilevers can also be constructed with trusses or slabs. This is in contrast to a simply supported beam such as those found in a post and lintel system. A simply supported beam is supported at both ends with loads applied between the supports. Cantilevers are widely found in construction, notably in cantilever bridges.
[15] It is difficult to cook rice –
A.
at the top of a mountain
B.
at the sea level
C.
under a mine
D.
same anywhere
Ans:
at the top of a mountain
Explanation :
On a mountain top the air pressure is a little lower. At higher elevations, water boils at a little lower temp than 100 degrees C. On a mountain top cooking takes longer, because it is like cooking on medium heat, instead of leaving the burner on high. Either way it will cook, one will take longer than the other. The boiling point of water in mountainous areas is lower because of a decreased air pressure (compared to sea level) at higher altitudes.
[16] Angle of friction and angle of repose are –
A.
Equal to each other
B.
Not equal to each other
C.
Proportional to each other
D.
None of the above
Ans:
Equal to each other
Explanation :
The angle of repose or the critical angle of repose, of a granular material is the steepest angle of descent or dip of the slope relative to the horizontal plane when material on the slope face is on the verge of sliding. This angle is in the range 0°-90° .when bulk granular materials are poured onto a horizontal surface, a conical pile will form. The internal angle between the surface of the pile and the horizontal surface is known as the angle of repose and is related to the density, surface area and shapes of the particles, and the coefficient of friction of the material.
[17] If a boy sitting in a train, which is moving at a constant velocity, throws a ball straight up into the air, the ball will –
A.
Fall in front of him
B.
Fall behind him
C.
Fall into his hand
D.
None of the above
Ans:
Fall into his hand
Explanation :
If a person throws a ball vertically upwards in a moving train, it comes back to his hand. The moment the ball was thrown, the ball was also in motion alone with the person who had thrown the ball and the train. This is due to inertia of motion. So when the ball remains in the air, both the person and the ball move ahead by the same distance. This makes the ball to come back to his hand on its return.
[18] A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?
A.
Increase
B.
Decrease
C.
Remain constant
D.
Will increase first and then decrease
Ans:
Increase
Explanation :
Assuming the disc is uniform and isotropic (the same in different directions), the hole will expand in the same ratio as the metal. It is because the thermal expansion equation applies to all lengths associated with the metal, including the circumference of the hole, since the edge of the hole is made out of metal. And if the circumference of the hole expands, so does the diameter.
[19] Stars in the sky appear to twinkle due to –
A.
a series of refractions
B.
a series of reflections
C.
a surface tension phenomenon
D.
multiple diminishing brightness
Ans:
a series of refractions
Explanation :
The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. This means that some of the light reaches us directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.
[20] A pilot has to release the bomb to hit a target –
A.
right above the target
B.
beyond the target
C.
before the target
D.
None of these
Ans:
before the target
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it.
[21] Parabolic mirros are used in –
A.
Car headlights
B.
Driving mirrors
C.
Dentists mirros
D.
Shaving mirros
Ans:
Car headlights
Explanation :
A parabolic reflector (mirror) transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. Since the principles of reflection are reversible, parabolic reflectors can also be used to project energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights.
[22] Which atmospheric layer contains ozone layer?
A.
Genosphere
B.
Zonosphere
C.
Stratosphere
D.
Ionosphere
Ans:
Stratosphere
Explanation :
The ozone (O2) found in upper part of the atmosphere, i.e., Stratosphere, is Good ozone, since, it acts as a shield for absorbing UV-radiations from sun.
[23] Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid:
A.
increases
B.
decreases
C.
stays the same
D.
none of the above
Ans:
increases
Explanation :
0
[24] Which of the following is the best conductor of Electricity?
A.
Ordinary water
B.
Sea water
C.
Boiled water
D.
Distilled water
Ans:
Sea water
Explanation :
It sounds crazy, but it's true! This is because Sea water has Salt that is a good conductor of electricity. Salt molecules are made of sodium ions and chlorine ions.
[25] Rate of change of momentum is -
A.
Area
B.
Pressure
C.
Force
D.
Velocity
Ans:
Force
Explanation :
According to Newton’s Second Law of motion, the rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force.
Explanation :
Ultraviolet radiation is used to kill microorganisms, molds and fungus in various environmental applications. UV sterilization is used for air-purification systems, water purification, aquarium and pond maintenance, laboratory hygiene and food and beverage protection.
[4] The audio signals of TV are –
A.
Amplitude modulated
B.
Frequency modulated
C.
Unmodulated
D.
Velocity modulated
Ans:
Frequency modulated
Explanation :
In analogue television, the sound portion of a broadcast is invariably modulated separately from the video. Most commonly, the audio and video are combined at the transmitter before being presented to the antenna, but in some cases separate aural and visual antennas can be used. In almost all cases, standard wideband frequency modulation is used.
[5] Red light is used for signals because it has –
A.
long wavelength
B.
high intensity
C.
high frequency
D.
low refraction in the medium
Ans:
long wavelength
Explanation :
Red is the international colour of stop signs and stop lights on highways and intersections because it is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a colour. Red has the highest wavelength of all the colours and is able to travel the longest distance through fog, rain, and the alike.
[6] The washing machine works on the principle of -
A.
Dialysis
B.
Diffusion
C.
Reverse osmosis
D.
Centrifugation
Ans:
Centrifugation
Explanation :
Washing machines work on the principle of centrifugation. They are based on medium sized centrifuges that put an object in rotation around a fixed axis, applying force perpendicular to the axis. It uses the sedimentation principle, where the centripetal acceleration separates substances of greater and lesser density. Besides, it also makes use of the centrifugal force generated in the “spin cycle” of washing machines that throws the water out through the little holes of perforated drum so that the washed clothes end up much drier.
[7] Which zone of a candle flame is the hottest?
A.
Dark innermost zone
B.
Outermost zone
C.
Middle luminous zone
D.
Central zone
Ans:
Middle luminous zone
Explanation :
The outermost zone of the flame is blue in colour and it is the hottest part. The innermost zone is the least hot and black in colour.
[8] 'Hydraulic brakes' work on the principle of –
A.
Pascal's law
B.
Thomson's law
C.
Newton's law
D.
Bernoulli's theorem
Ans:
Pascal's law
Explanation :
Pascal's law states that when there is an increase in pressure at any point in a confined fluid, there is an equal increase at every other point in the container. According to Pascal's principle, in a hydraulic system a pressure exerted on a piston produces an equal increase in pressure on another piston in the system.
[9] The instrument for measuring intensity of earthquakes is called –
A.
Ediograph
B.
Pantagraph
C.
Ergograph
D.
Seismograph
Ans:
Seismograph
Explanation :
Seismometers are instrument that measures motion of the ground, including those of seismic waves generated by earthquakes, volcanic eruptions and other seismic sources. Records of seismic waves allow seismologists to map the interior of the earth and locate and measure the size of these different sources. Seismograph is another Greek term meaning to draw seismic waves.
[10] Which one of the following animals can hear ultrasonic sound?
A.
Rat
B.
Squirrel
C.
Cat
D.
Bat
Ans:
Bat
Explanation :
Ultrasound is a cyclic sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasound is thus not separated from "normal" (audible) sound based on differences in physical properties, only the fact that humans cannot hear it.
[11] ‘Therm' is the unit of –
A.
Power
B.
Heat
C.
Light
D.
Distance
Ans:
Heat
Explanation :
Therm is a non-SI unit of heat energy equal to 100,000 British thermal units (BTU). It is approximately the enemy equivalent of burning 100 cubic feet (often referred to as 1 CCF) of natural gas. Since (Natural Gas) meters measure volume and not energy content, a therm factor is used by (Natural) gas companies to convert the volume of gas used to its heat equivalent, and thus calculate the actual energy use.
[12] Newton's first law of motion gives the concept of –
A.
Energy
B.
Work
C.
Momentum
D.
Inertia
Ans:
Inertia
Explanation :
Newton's laws of motion are three physical laws that form the basis for classical mechanics. They describe the relationship between the forces acting on a body and its motion due to those forces. The first law states that if the net force (the vector sum of all forces acting on an object) is zero, then the velocity of the object is constant. Newton's first law is often referred to as the law of inertia.
[13] When heated from 0° to 10°C volume of a given mass of water will -
A.
Increase gradually
B.
Decrease gradually
C.
Increase and after will decrease
D.
Decrease and after will increase
Ans:
Decrease and after will increase
Explanation :
As water has maximum density at 40C. So going from 00C to 100C. First its volume decreases upto 40C, making density maximum and then increases to lower the density again.
[14] Which of the following is an example for cantilever beam?
A.
Diving board
B.
Bridge
C.
See-saw
D.
Common balance
Ans:
Bridge
Explanation :
A cantilever is a beam anchored at only one end. The beam carries the load to the support where it is resisted by moment and shear stress. Cantilever construction allows for overhanging structures without external bracing. Cantilevers can also be constructed with trusses or slabs. This is in contrast to a simply supported beam such as those found in a post and lintel system. A simply supported beam is supported at both ends with loads applied between the supports. Cantilevers are widely found in construction, notably in cantilever bridges.
[15] It is difficult to cook rice –
A.
at the top of a mountain
B.
at the sea level
C.
under a mine
D.
same anywhere
Ans:
at the top of a mountain
Explanation :
On a mountain top the air pressure is a little lower. At higher elevations, water boils at a little lower temp than 100 degrees C. On a mountain top cooking takes longer, because it is like cooking on medium heat, instead of leaving the burner on high. Either way it will cook, one will take longer than the other. The boiling point of water in mountainous areas is lower because of a decreased air pressure (compared to sea level) at higher altitudes.
[16] Angle of friction and angle of repose are –
A.
Equal to each other
B.
Not equal to each other
C.
Proportional to each other
D.
None of the above
Ans:
Equal to each other
Explanation :
The angle of repose or the critical angle of repose, of a granular material is the steepest angle of descent or dip of the slope relative to the horizontal plane when material on the slope face is on the verge of sliding. This angle is in the range 0°-90° .when bulk granular materials are poured onto a horizontal surface, a conical pile will form. The internal angle between the surface of the pile and the horizontal surface is known as the angle of repose and is related to the density, surface area and shapes of the particles, and the coefficient of friction of the material.
[17] If a boy sitting in a train, which is moving at a constant velocity, throws a ball straight up into the air, the ball will –
A.
Fall in front of him
B.
Fall behind him
C.
Fall into his hand
D.
None of the above
Ans:
Fall into his hand
Explanation :
If a person throws a ball vertically upwards in a moving train, it comes back to his hand. The moment the ball was thrown, the ball was also in motion alone with the person who had thrown the ball and the train. This is due to inertia of motion. So when the ball remains in the air, both the person and the ball move ahead by the same distance. This makes the ball to come back to his hand on its return.
[18] A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?
A.
Increase
B.
Decrease
C.
Remain constant
D.
Will increase first and then decrease
Ans:
Increase
Explanation :
Assuming the disc is uniform and isotropic (the same in different directions), the hole will expand in the same ratio as the metal. It is because the thermal expansion equation applies to all lengths associated with the metal, including the circumference of the hole, since the edge of the hole is made out of metal. And if the circumference of the hole expands, so does the diameter.
[19] Stars in the sky appear to twinkle due to –
A.
a series of refractions
B.
a series of reflections
C.
a surface tension phenomenon
D.
multiple diminishing brightness
Ans:
a series of refractions
Explanation :
The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. This means that some of the light reaches us directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.
[20] A pilot has to release the bomb to hit a target –
A.
right above the target
B.
beyond the target
C.
before the target
D.
None of these
Ans:
before the target
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it.
[21] Parabolic mirros are used in –
A.
Car headlights
B.
Driving mirrors
C.
Dentists mirros
D.
Shaving mirros
Ans:
Car headlights
Explanation :
A parabolic reflector (mirror) transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. Since the principles of reflection are reversible, parabolic reflectors can also be used to project energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights.
[22] Which atmospheric layer contains ozone layer?
A.
Genosphere
B.
Zonosphere
C.
Stratosphere
D.
Ionosphere
Ans:
Stratosphere
Explanation :
The ozone (O2) found in upper part of the atmosphere, i.e., Stratosphere, is Good ozone, since, it acts as a shield for absorbing UV-radiations from sun.
[23] Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid:
A.
increases
B.
decreases
C.
stays the same
D.
none of the above
Ans:
increases
Explanation :
0
[24] Which of the following is the best conductor of Electricity?
A.
Ordinary water
B.
Sea water
C.
Boiled water
D.
Distilled water
Ans:
Sea water
Explanation :
It sounds crazy, but it's true! This is because Sea water has Salt that is a good conductor of electricity. Salt molecules are made of sodium ions and chlorine ions.
[25] Rate of change of momentum is -
A.
Area
B.
Pressure
C.
Force
D.
Velocity
Ans:
Force
Explanation :
According to Newton’s Second Law of motion, the rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force.
Explanation :
Red is the international colour of stop signs and stop lights on highways and intersections because it is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a colour. Red has the highest wavelength of all the colours and is able to travel the longest distance through fog, rain, and the alike.
[6] The washing machine works on the principle of -
A.
Dialysis
B.
Diffusion
C.
Reverse osmosis
D.
Centrifugation
Ans:
Centrifugation
Explanation :
Washing machines work on the principle of centrifugation. They are based on medium sized centrifuges that put an object in rotation around a fixed axis, applying force perpendicular to the axis. It uses the sedimentation principle, where the centripetal acceleration separates substances of greater and lesser density. Besides, it also makes use of the centrifugal force generated in the “spin cycle” of washing machines that throws the water out through the little holes of perforated drum so that the washed clothes end up much drier.
[7] Which zone of a candle flame is the hottest?
A.
Dark innermost zone
B.
Outermost zone
C.
Middle luminous zone
D.
Central zone
Ans:
Middle luminous zone
Explanation :
The outermost zone of the flame is blue in colour and it is the hottest part. The innermost zone is the least hot and black in colour.
[8] 'Hydraulic brakes' work on the principle of –
A.
Pascal's law
B.
Thomson's law
C.
Newton's law
D.
Bernoulli's theorem
Ans:
Pascal's law
Explanation :
Pascal's law states that when there is an increase in pressure at any point in a confined fluid, there is an equal increase at every other point in the container. According to Pascal's principle, in a hydraulic system a pressure exerted on a piston produces an equal increase in pressure on another piston in the system.
[9] The instrument for measuring intensity of earthquakes is called –
A.
Ediograph
B.
Pantagraph
C.
Ergograph
D.
Seismograph
Ans:
Seismograph
Explanation :
Seismometers are instrument that measures motion of the ground, including those of seismic waves generated by earthquakes, volcanic eruptions and other seismic sources. Records of seismic waves allow seismologists to map the interior of the earth and locate and measure the size of these different sources. Seismograph is another Greek term meaning to draw seismic waves.
[10] Which one of the following animals can hear ultrasonic sound?
A.
Rat
B.
Squirrel
C.
Cat
D.
Bat
Ans:
Bat
Explanation :
Ultrasound is a cyclic sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasound is thus not separated from "normal" (audible) sound based on differences in physical properties, only the fact that humans cannot hear it.
[11] ‘Therm' is the unit of –
A.
Power
B.
Heat
C.
Light
D.
Distance
Ans:
Heat
Explanation :
Therm is a non-SI unit of heat energy equal to 100,000 British thermal units (BTU). It is approximately the enemy equivalent of burning 100 cubic feet (often referred to as 1 CCF) of natural gas. Since (Natural Gas) meters measure volume and not energy content, a therm factor is used by (Natural) gas companies to convert the volume of gas used to its heat equivalent, and thus calculate the actual energy use.
[12] Newton's first law of motion gives the concept of –
A.
Energy
B.
Work
C.
Momentum
D.
Inertia
Ans:
Inertia
Explanation :
Newton's laws of motion are three physical laws that form the basis for classical mechanics. They describe the relationship between the forces acting on a body and its motion due to those forces. The first law states that if the net force (the vector sum of all forces acting on an object) is zero, then the velocity of the object is constant. Newton's first law is often referred to as the law of inertia.
[13] When heated from 0° to 10°C volume of a given mass of water will -
A.
Increase gradually
B.
Decrease gradually
C.
Increase and after will decrease
D.
Decrease and after will increase
Ans:
Decrease and after will increase
Explanation :
As water has maximum density at 40C. So going from 00C to 100C. First its volume decreases upto 40C, making density maximum and then increases to lower the density again.
[14] Which of the following is an example for cantilever beam?
A.
Diving board
B.
Bridge
C.
See-saw
D.
Common balance
Ans:
Bridge
Explanation :
A cantilever is a beam anchored at only one end. The beam carries the load to the support where it is resisted by moment and shear stress. Cantilever construction allows for overhanging structures without external bracing. Cantilevers can also be constructed with trusses or slabs. This is in contrast to a simply supported beam such as those found in a post and lintel system. A simply supported beam is supported at both ends with loads applied between the supports. Cantilevers are widely found in construction, notably in cantilever bridges.
[15] It is difficult to cook rice –
A.
at the top of a mountain
B.
at the sea level
C.
under a mine
D.
same anywhere
Ans:
at the top of a mountain
Explanation :
On a mountain top the air pressure is a little lower. At higher elevations, water boils at a little lower temp than 100 degrees C. On a mountain top cooking takes longer, because it is like cooking on medium heat, instead of leaving the burner on high. Either way it will cook, one will take longer than the other. The boiling point of water in mountainous areas is lower because of a decreased air pressure (compared to sea level) at higher altitudes.
[16] Angle of friction and angle of repose are –
A.
Equal to each other
B.
Not equal to each other
C.
Proportional to each other
D.
None of the above
Ans:
Equal to each other
Explanation :
The angle of repose or the critical angle of repose, of a granular material is the steepest angle of descent or dip of the slope relative to the horizontal plane when material on the slope face is on the verge of sliding. This angle is in the range 0°-90° .when bulk granular materials are poured onto a horizontal surface, a conical pile will form. The internal angle between the surface of the pile and the horizontal surface is known as the angle of repose and is related to the density, surface area and shapes of the particles, and the coefficient of friction of the material.
[17] If a boy sitting in a train, which is moving at a constant velocity, throws a ball straight up into the air, the ball will –
A.
Fall in front of him
B.
Fall behind him
C.
Fall into his hand
D.
None of the above
Ans:
Fall into his hand
Explanation :
If a person throws a ball vertically upwards in a moving train, it comes back to his hand. The moment the ball was thrown, the ball was also in motion alone with the person who had thrown the ball and the train. This is due to inertia of motion. So when the ball remains in the air, both the person and the ball move ahead by the same distance. This makes the ball to come back to his hand on its return.
[18] A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?
A.
Increase
B.
Decrease
C.
Remain constant
D.
Will increase first and then decrease
Ans:
Increase
Explanation :
Assuming the disc is uniform and isotropic (the same in different directions), the hole will expand in the same ratio as the metal. It is because the thermal expansion equation applies to all lengths associated with the metal, including the circumference of the hole, since the edge of the hole is made out of metal. And if the circumference of the hole expands, so does the diameter.
[19] Stars in the sky appear to twinkle due to –
A.
a series of refractions
B.
a series of reflections
C.
a surface tension phenomenon
D.
multiple diminishing brightness
Ans:
a series of refractions
Explanation :
The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. This means that some of the light reaches us directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.
[20] A pilot has to release the bomb to hit a target –
A.
right above the target
B.
beyond the target
C.
before the target
D.
None of these
Ans:
before the target
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it.
[21] Parabolic mirros are used in –
A.
Car headlights
B.
Driving mirrors
C.
Dentists mirros
D.
Shaving mirros
Ans:
Car headlights
Explanation :
A parabolic reflector (mirror) transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. Since the principles of reflection are reversible, parabolic reflectors can also be used to project energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights.
[22] Which atmospheric layer contains ozone layer?
A.
Genosphere
B.
Zonosphere
C.
Stratosphere
D.
Ionosphere
Ans:
Stratosphere
Explanation :
The ozone (O2) found in upper part of the atmosphere, i.e., Stratosphere, is Good ozone, since, it acts as a shield for absorbing UV-radiations from sun.
[23] Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid:
A.
increases
B.
decreases
C.
stays the same
D.
none of the above
Ans:
increases
Explanation :
0
[24] Which of the following is the best conductor of Electricity?
A.
Ordinary water
B.
Sea water
C.
Boiled water
D.
Distilled water
Ans:
Sea water
Explanation :
It sounds crazy, but it's true! This is because Sea water has Salt that is a good conductor of electricity. Salt molecules are made of sodium ions and chlorine ions.
[25] Rate of change of momentum is -
A.
Area
B.
Pressure
C.
Force
D.
Velocity
Ans:
Force
Explanation :
According to Newton’s Second Law of motion, the rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force.
Explanation :
The outermost zone of the flame is blue in colour and it is the hottest part. The innermost zone is the least hot and black in colour.
[8] 'Hydraulic brakes' work on the principle of –
A.
Pascal's law
B.
Thomson's law
C.
Newton's law
D.
Bernoulli's theorem
Ans:
Pascal's law
Explanation :
Pascal's law states that when there is an increase in pressure at any point in a confined fluid, there is an equal increase at every other point in the container. According to Pascal's principle, in a hydraulic system a pressure exerted on a piston produces an equal increase in pressure on another piston in the system.
[9] The instrument for measuring intensity of earthquakes is called –
A.
Ediograph
B.
Pantagraph
C.
Ergograph
D.
Seismograph
Ans:
Seismograph
Explanation :
Seismometers are instrument that measures motion of the ground, including those of seismic waves generated by earthquakes, volcanic eruptions and other seismic sources. Records of seismic waves allow seismologists to map the interior of the earth and locate and measure the size of these different sources. Seismograph is another Greek term meaning to draw seismic waves.
[10] Which one of the following animals can hear ultrasonic sound?
A.
Rat
B.
Squirrel
C.
Cat
D.
Bat
Ans:
Bat
Explanation :
Ultrasound is a cyclic sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasound is thus not separated from "normal" (audible) sound based on differences in physical properties, only the fact that humans cannot hear it.
[11] ‘Therm' is the unit of –
A.
Power
B.
Heat
C.
Light
D.
Distance
Ans:
Heat
Explanation :
Therm is a non-SI unit of heat energy equal to 100,000 British thermal units (BTU). It is approximately the enemy equivalent of burning 100 cubic feet (often referred to as 1 CCF) of natural gas. Since (Natural Gas) meters measure volume and not energy content, a therm factor is used by (Natural) gas companies to convert the volume of gas used to its heat equivalent, and thus calculate the actual energy use.
[12] Newton's first law of motion gives the concept of –
A.
Energy
B.
Work
C.
Momentum
D.
Inertia
Ans:
Inertia
Explanation :
Newton's laws of motion are three physical laws that form the basis for classical mechanics. They describe the relationship between the forces acting on a body and its motion due to those forces. The first law states that if the net force (the vector sum of all forces acting on an object) is zero, then the velocity of the object is constant. Newton's first law is often referred to as the law of inertia.
[13] When heated from 0° to 10°C volume of a given mass of water will -
A.
Increase gradually
B.
Decrease gradually
C.
Increase and after will decrease
D.
Decrease and after will increase
Ans:
Decrease and after will increase
Explanation :
As water has maximum density at 40C. So going from 00C to 100C. First its volume decreases upto 40C, making density maximum and then increases to lower the density again.
[14] Which of the following is an example for cantilever beam?
A.
Diving board
B.
Bridge
C.
See-saw
D.
Common balance
Ans:
Bridge
Explanation :
A cantilever is a beam anchored at only one end. The beam carries the load to the support where it is resisted by moment and shear stress. Cantilever construction allows for overhanging structures without external bracing. Cantilevers can also be constructed with trusses or slabs. This is in contrast to a simply supported beam such as those found in a post and lintel system. A simply supported beam is supported at both ends with loads applied between the supports. Cantilevers are widely found in construction, notably in cantilever bridges.
[15] It is difficult to cook rice –
A.
at the top of a mountain
B.
at the sea level
C.
under a mine
D.
same anywhere
Ans:
at the top of a mountain
Explanation :
On a mountain top the air pressure is a little lower. At higher elevations, water boils at a little lower temp than 100 degrees C. On a mountain top cooking takes longer, because it is like cooking on medium heat, instead of leaving the burner on high. Either way it will cook, one will take longer than the other. The boiling point of water in mountainous areas is lower because of a decreased air pressure (compared to sea level) at higher altitudes.
[16] Angle of friction and angle of repose are –
A.
Equal to each other
B.
Not equal to each other
C.
Proportional to each other
D.
None of the above
Ans:
Equal to each other
Explanation :
The angle of repose or the critical angle of repose, of a granular material is the steepest angle of descent or dip of the slope relative to the horizontal plane when material on the slope face is on the verge of sliding. This angle is in the range 0°-90° .when bulk granular materials are poured onto a horizontal surface, a conical pile will form. The internal angle between the surface of the pile and the horizontal surface is known as the angle of repose and is related to the density, surface area and shapes of the particles, and the coefficient of friction of the material.
[17] If a boy sitting in a train, which is moving at a constant velocity, throws a ball straight up into the air, the ball will –
A.
Fall in front of him
B.
Fall behind him
C.
Fall into his hand
D.
None of the above
Ans:
Fall into his hand
Explanation :
If a person throws a ball vertically upwards in a moving train, it comes back to his hand. The moment the ball was thrown, the ball was also in motion alone with the person who had thrown the ball and the train. This is due to inertia of motion. So when the ball remains in the air, both the person and the ball move ahead by the same distance. This makes the ball to come back to his hand on its return.
[18] A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?
A.
Increase
B.
Decrease
C.
Remain constant
D.
Will increase first and then decrease
Ans:
Increase
Explanation :
Assuming the disc is uniform and isotropic (the same in different directions), the hole will expand in the same ratio as the metal. It is because the thermal expansion equation applies to all lengths associated with the metal, including the circumference of the hole, since the edge of the hole is made out of metal. And if the circumference of the hole expands, so does the diameter.
[19] Stars in the sky appear to twinkle due to –
A.
a series of refractions
B.
a series of reflections
C.
a surface tension phenomenon
D.
multiple diminishing brightness
Ans:
a series of refractions
Explanation :
The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. This means that some of the light reaches us directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.
[20] A pilot has to release the bomb to hit a target –
A.
right above the target
B.
beyond the target
C.
before the target
D.
None of these
Ans:
before the target
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it.
[21] Parabolic mirros are used in –
A.
Car headlights
B.
Driving mirrors
C.
Dentists mirros
D.
Shaving mirros
Ans:
Car headlights
Explanation :
A parabolic reflector (mirror) transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. Since the principles of reflection are reversible, parabolic reflectors can also be used to project energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights.
[22] Which atmospheric layer contains ozone layer?
A.
Genosphere
B.
Zonosphere
C.
Stratosphere
D.
Ionosphere
Ans:
Stratosphere
Explanation :
The ozone (O2) found in upper part of the atmosphere, i.e., Stratosphere, is Good ozone, since, it acts as a shield for absorbing UV-radiations from sun.
[23] Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid:
A.
increases
B.
decreases
C.
stays the same
D.
none of the above
Ans:
increases
Explanation :
0
[24] Which of the following is the best conductor of Electricity?
A.
Ordinary water
B.
Sea water
C.
Boiled water
D.
Distilled water
Ans:
Sea water
Explanation :
It sounds crazy, but it's true! This is because Sea water has Salt that is a good conductor of electricity. Salt molecules are made of sodium ions and chlorine ions.
[25] Rate of change of momentum is -
A.
Area
B.
Pressure
C.
Force
D.
Velocity
Ans:
Force
Explanation :
According to Newton’s Second Law of motion, the rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force.
Explanation :
Seismometers are instrument that measures motion of the ground, including those of seismic waves generated by earthquakes, volcanic eruptions and other seismic sources. Records of seismic waves allow seismologists to map the interior of the earth and locate and measure the size of these different sources. Seismograph is another Greek term meaning to draw seismic waves.
[10] Which one of the following animals can hear ultrasonic sound?
A.
Rat
B.
Squirrel
C.
Cat
D.
Bat
Ans:
Bat
Explanation :
Ultrasound is a cyclic sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasound is thus not separated from "normal" (audible) sound based on differences in physical properties, only the fact that humans cannot hear it.
[11] ‘Therm' is the unit of –
A.
Power
B.
Heat
C.
Light
D.
Distance
Ans:
Heat
Explanation :
Therm is a non-SI unit of heat energy equal to 100,000 British thermal units (BTU). It is approximately the enemy equivalent of burning 100 cubic feet (often referred to as 1 CCF) of natural gas. Since (Natural Gas) meters measure volume and not energy content, a therm factor is used by (Natural) gas companies to convert the volume of gas used to its heat equivalent, and thus calculate the actual energy use.
[12] Newton's first law of motion gives the concept of –
A.
Energy
B.
Work
C.
Momentum
D.
Inertia
Ans:
Inertia
Explanation :
Newton's laws of motion are three physical laws that form the basis for classical mechanics. They describe the relationship between the forces acting on a body and its motion due to those forces. The first law states that if the net force (the vector sum of all forces acting on an object) is zero, then the velocity of the object is constant. Newton's first law is often referred to as the law of inertia.
[13] When heated from 0° to 10°C volume of a given mass of water will -
A.
Increase gradually
B.
Decrease gradually
C.
Increase and after will decrease
D.
Decrease and after will increase
Ans:
Decrease and after will increase
Explanation :
As water has maximum density at 40C. So going from 00C to 100C. First its volume decreases upto 40C, making density maximum and then increases to lower the density again.
[14] Which of the following is an example for cantilever beam?
A.
Diving board
B.
Bridge
C.
See-saw
D.
Common balance
Ans:
Bridge
Explanation :
A cantilever is a beam anchored at only one end. The beam carries the load to the support where it is resisted by moment and shear stress. Cantilever construction allows for overhanging structures without external bracing. Cantilevers can also be constructed with trusses or slabs. This is in contrast to a simply supported beam such as those found in a post and lintel system. A simply supported beam is supported at both ends with loads applied between the supports. Cantilevers are widely found in construction, notably in cantilever bridges.
[15] It is difficult to cook rice –
A.
at the top of a mountain
B.
at the sea level
C.
under a mine
D.
same anywhere
Ans:
at the top of a mountain
Explanation :
On a mountain top the air pressure is a little lower. At higher elevations, water boils at a little lower temp than 100 degrees C. On a mountain top cooking takes longer, because it is like cooking on medium heat, instead of leaving the burner on high. Either way it will cook, one will take longer than the other. The boiling point of water in mountainous areas is lower because of a decreased air pressure (compared to sea level) at higher altitudes.
[16] Angle of friction and angle of repose are –
A.
Equal to each other
B.
Not equal to each other
C.
Proportional to each other
D.
None of the above
Ans:
Equal to each other
Explanation :
The angle of repose or the critical angle of repose, of a granular material is the steepest angle of descent or dip of the slope relative to the horizontal plane when material on the slope face is on the verge of sliding. This angle is in the range 0°-90° .when bulk granular materials are poured onto a horizontal surface, a conical pile will form. The internal angle between the surface of the pile and the horizontal surface is known as the angle of repose and is related to the density, surface area and shapes of the particles, and the coefficient of friction of the material.
[17] If a boy sitting in a train, which is moving at a constant velocity, throws a ball straight up into the air, the ball will –
A.
Fall in front of him
B.
Fall behind him
C.
Fall into his hand
D.
None of the above
Ans:
Fall into his hand
Explanation :
If a person throws a ball vertically upwards in a moving train, it comes back to his hand. The moment the ball was thrown, the ball was also in motion alone with the person who had thrown the ball and the train. This is due to inertia of motion. So when the ball remains in the air, both the person and the ball move ahead by the same distance. This makes the ball to come back to his hand on its return.
[18] A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?
A.
Increase
B.
Decrease
C.
Remain constant
D.
Will increase first and then decrease
Ans:
Increase
Explanation :
Assuming the disc is uniform and isotropic (the same in different directions), the hole will expand in the same ratio as the metal. It is because the thermal expansion equation applies to all lengths associated with the metal, including the circumference of the hole, since the edge of the hole is made out of metal. And if the circumference of the hole expands, so does the diameter.
[19] Stars in the sky appear to twinkle due to –
A.
a series of refractions
B.
a series of reflections
C.
a surface tension phenomenon
D.
multiple diminishing brightness
Ans:
a series of refractions
Explanation :
The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. This means that some of the light reaches us directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.
[20] A pilot has to release the bomb to hit a target –
A.
right above the target
B.
beyond the target
C.
before the target
D.
None of these
Ans:
before the target
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it.
[21] Parabolic mirros are used in –
A.
Car headlights
B.
Driving mirrors
C.
Dentists mirros
D.
Shaving mirros
Ans:
Car headlights
Explanation :
A parabolic reflector (mirror) transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. Since the principles of reflection are reversible, parabolic reflectors can also be used to project energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights.
[22] Which atmospheric layer contains ozone layer?
A.
Genosphere
B.
Zonosphere
C.
Stratosphere
D.
Ionosphere
Ans:
Stratosphere
Explanation :
The ozone (O2) found in upper part of the atmosphere, i.e., Stratosphere, is Good ozone, since, it acts as a shield for absorbing UV-radiations from sun.
[23] Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid:
A.
increases
B.
decreases
C.
stays the same
D.
none of the above
Ans:
increases
Explanation :
0
[24] Which of the following is the best conductor of Electricity?
A.
Ordinary water
B.
Sea water
C.
Boiled water
D.
Distilled water
Ans:
Sea water
Explanation :
It sounds crazy, but it's true! This is because Sea water has Salt that is a good conductor of electricity. Salt molecules are made of sodium ions and chlorine ions.
[25] Rate of change of momentum is -
A.
Area
B.
Pressure
C.
Force
D.
Velocity
Ans:
Force
Explanation :
According to Newton’s Second Law of motion, the rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force.
Explanation :
Therm is a non-SI unit of heat energy equal to 100,000 British thermal units (BTU). It is approximately the enemy equivalent of burning 100 cubic feet (often referred to as 1 CCF) of natural gas. Since (Natural Gas) meters measure volume and not energy content, a therm factor is used by (Natural) gas companies to convert the volume of gas used to its heat equivalent, and thus calculate the actual energy use.
[12] Newton's first law of motion gives the concept of –
A.
Energy
B.
Work
C.
Momentum
D.
Inertia
Ans:
Inertia
Explanation :
Newton's laws of motion are three physical laws that form the basis for classical mechanics. They describe the relationship between the forces acting on a body and its motion due to those forces. The first law states that if the net force (the vector sum of all forces acting on an object) is zero, then the velocity of the object is constant. Newton's first law is often referred to as the law of inertia.
[13] When heated from 0° to 10°C volume of a given mass of water will -
A.
Increase gradually
B.
Decrease gradually
C.
Increase and after will decrease
D.
Decrease and after will increase
Ans:
Decrease and after will increase
Explanation :
As water has maximum density at 40C. So going from 00C to 100C. First its volume decreases upto 40C, making density maximum and then increases to lower the density again.
[14] Which of the following is an example for cantilever beam?
A.
Diving board
B.
Bridge
C.
See-saw
D.
Common balance
Ans:
Bridge
Explanation :
A cantilever is a beam anchored at only one end. The beam carries the load to the support where it is resisted by moment and shear stress. Cantilever construction allows for overhanging structures without external bracing. Cantilevers can also be constructed with trusses or slabs. This is in contrast to a simply supported beam such as those found in a post and lintel system. A simply supported beam is supported at both ends with loads applied between the supports. Cantilevers are widely found in construction, notably in cantilever bridges.
[15] It is difficult to cook rice –
A.
at the top of a mountain
B.
at the sea level
C.
under a mine
D.
same anywhere
Ans:
at the top of a mountain
Explanation :
On a mountain top the air pressure is a little lower. At higher elevations, water boils at a little lower temp than 100 degrees C. On a mountain top cooking takes longer, because it is like cooking on medium heat, instead of leaving the burner on high. Either way it will cook, one will take longer than the other. The boiling point of water in mountainous areas is lower because of a decreased air pressure (compared to sea level) at higher altitudes.
[16] Angle of friction and angle of repose are –
A.
Equal to each other
B.
Not equal to each other
C.
Proportional to each other
D.
None of the above
Ans:
Equal to each other
Explanation :
The angle of repose or the critical angle of repose, of a granular material is the steepest angle of descent or dip of the slope relative to the horizontal plane when material on the slope face is on the verge of sliding. This angle is in the range 0°-90° .when bulk granular materials are poured onto a horizontal surface, a conical pile will form. The internal angle between the surface of the pile and the horizontal surface is known as the angle of repose and is related to the density, surface area and shapes of the particles, and the coefficient of friction of the material.
[17] If a boy sitting in a train, which is moving at a constant velocity, throws a ball straight up into the air, the ball will –
A.
Fall in front of him
B.
Fall behind him
C.
Fall into his hand
D.
None of the above
Ans:
Fall into his hand
Explanation :
If a person throws a ball vertically upwards in a moving train, it comes back to his hand. The moment the ball was thrown, the ball was also in motion alone with the person who had thrown the ball and the train. This is due to inertia of motion. So when the ball remains in the air, both the person and the ball move ahead by the same distance. This makes the ball to come back to his hand on its return.
[18] A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?
A.
Increase
B.
Decrease
C.
Remain constant
D.
Will increase first and then decrease
Ans:
Increase
Explanation :
Assuming the disc is uniform and isotropic (the same in different directions), the hole will expand in the same ratio as the metal. It is because the thermal expansion equation applies to all lengths associated with the metal, including the circumference of the hole, since the edge of the hole is made out of metal. And if the circumference of the hole expands, so does the diameter.
[19] Stars in the sky appear to twinkle due to –
A.
a series of refractions
B.
a series of reflections
C.
a surface tension phenomenon
D.
multiple diminishing brightness
Ans:
a series of refractions
Explanation :
The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. This means that some of the light reaches us directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.
[20] A pilot has to release the bomb to hit a target –
A.
right above the target
B.
beyond the target
C.
before the target
D.
None of these
Ans:
before the target
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it.
[21] Parabolic mirros are used in –
A.
Car headlights
B.
Driving mirrors
C.
Dentists mirros
D.
Shaving mirros
Ans:
Car headlights
Explanation :
A parabolic reflector (mirror) transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. Since the principles of reflection are reversible, parabolic reflectors can also be used to project energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights.
[22] Which atmospheric layer contains ozone layer?
A.
Genosphere
B.
Zonosphere
C.
Stratosphere
D.
Ionosphere
Ans:
Stratosphere
Explanation :
The ozone (O2) found in upper part of the atmosphere, i.e., Stratosphere, is Good ozone, since, it acts as a shield for absorbing UV-radiations from sun.
[23] Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid:
A.
increases
B.
decreases
C.
stays the same
D.
none of the above
Ans:
increases
Explanation :
0
[24] Which of the following is the best conductor of Electricity?
A.
Ordinary water
B.
Sea water
C.
Boiled water
D.
Distilled water
Ans:
Sea water
Explanation :
It sounds crazy, but it's true! This is because Sea water has Salt that is a good conductor of electricity. Salt molecules are made of sodium ions and chlorine ions.
[25] Rate of change of momentum is -
A.
Area
B.
Pressure
C.
Force
D.
Velocity
Ans:
Force
Explanation :
According to Newton’s Second Law of motion, the rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force.
Explanation :
As water has maximum density at 40C. So going from 00C to 100C. First its volume decreases upto 40C, making density maximum and then increases to lower the density again.
[14] Which of the following is an example for cantilever beam?
A.
Diving board
B.
Bridge
C.
See-saw
D.
Common balance
Ans:
Bridge
Explanation :
A cantilever is a beam anchored at only one end. The beam carries the load to the support where it is resisted by moment and shear stress. Cantilever construction allows for overhanging structures without external bracing. Cantilevers can also be constructed with trusses or slabs. This is in contrast to a simply supported beam such as those found in a post and lintel system. A simply supported beam is supported at both ends with loads applied between the supports. Cantilevers are widely found in construction, notably in cantilever bridges.
[15] It is difficult to cook rice –
A.
at the top of a mountain
B.
at the sea level
C.
under a mine
D.
same anywhere
Ans:
at the top of a mountain
Explanation :
On a mountain top the air pressure is a little lower. At higher elevations, water boils at a little lower temp than 100 degrees C. On a mountain top cooking takes longer, because it is like cooking on medium heat, instead of leaving the burner on high. Either way it will cook, one will take longer than the other. The boiling point of water in mountainous areas is lower because of a decreased air pressure (compared to sea level) at higher altitudes.
[16] Angle of friction and angle of repose are –
A.
Equal to each other
B.
Not equal to each other
C.
Proportional to each other
D.
None of the above
Ans:
Equal to each other
Explanation :
The angle of repose or the critical angle of repose, of a granular material is the steepest angle of descent or dip of the slope relative to the horizontal plane when material on the slope face is on the verge of sliding. This angle is in the range 0°-90° .when bulk granular materials are poured onto a horizontal surface, a conical pile will form. The internal angle between the surface of the pile and the horizontal surface is known as the angle of repose and is related to the density, surface area and shapes of the particles, and the coefficient of friction of the material.
[17] If a boy sitting in a train, which is moving at a constant velocity, throws a ball straight up into the air, the ball will –
A.
Fall in front of him
B.
Fall behind him
C.
Fall into his hand
D.
None of the above
Ans:
Fall into his hand
Explanation :
If a person throws a ball vertically upwards in a moving train, it comes back to his hand. The moment the ball was thrown, the ball was also in motion alone with the person who had thrown the ball and the train. This is due to inertia of motion. So when the ball remains in the air, both the person and the ball move ahead by the same distance. This makes the ball to come back to his hand on its return.
[18] A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?
A.
Increase
B.
Decrease
C.
Remain constant
D.
Will increase first and then decrease
Ans:
Increase
Explanation :
Assuming the disc is uniform and isotropic (the same in different directions), the hole will expand in the same ratio as the metal. It is because the thermal expansion equation applies to all lengths associated with the metal, including the circumference of the hole, since the edge of the hole is made out of metal. And if the circumference of the hole expands, so does the diameter.
[19] Stars in the sky appear to twinkle due to –
A.
a series of refractions
B.
a series of reflections
C.
a surface tension phenomenon
D.
multiple diminishing brightness
Ans:
a series of refractions
Explanation :
The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. This means that some of the light reaches us directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.
[20] A pilot has to release the bomb to hit a target –
A.
right above the target
B.
beyond the target
C.
before the target
D.
None of these
Ans:
before the target
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it.
[21] Parabolic mirros are used in –
A.
Car headlights
B.
Driving mirrors
C.
Dentists mirros
D.
Shaving mirros
Ans:
Car headlights
Explanation :
A parabolic reflector (mirror) transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. Since the principles of reflection are reversible, parabolic reflectors can also be used to project energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights.
[22] Which atmospheric layer contains ozone layer?
A.
Genosphere
B.
Zonosphere
C.
Stratosphere
D.
Ionosphere
Ans:
Stratosphere
Explanation :
The ozone (O2) found in upper part of the atmosphere, i.e., Stratosphere, is Good ozone, since, it acts as a shield for absorbing UV-radiations from sun.
[23] Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid:
A.
increases
B.
decreases
C.
stays the same
D.
none of the above
Ans:
increases
Explanation :
0
[24] Which of the following is the best conductor of Electricity?
A.
Ordinary water
B.
Sea water
C.
Boiled water
D.
Distilled water
Ans:
Sea water
Explanation :
It sounds crazy, but it's true! This is because Sea water has Salt that is a good conductor of electricity. Salt molecules are made of sodium ions and chlorine ions.
[25] Rate of change of momentum is -
A.
Area
B.
Pressure
C.
Force
D.
Velocity
Ans:
Force
Explanation :
According to Newton’s Second Law of motion, the rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force.
Explanation :
On a mountain top the air pressure is a little lower. At higher elevations, water boils at a little lower temp than 100 degrees C. On a mountain top cooking takes longer, because it is like cooking on medium heat, instead of leaving the burner on high. Either way it will cook, one will take longer than the other. The boiling point of water in mountainous areas is lower because of a decreased air pressure (compared to sea level) at higher altitudes.
[16] Angle of friction and angle of repose are –
A.
Equal to each other
B.
Not equal to each other
C.
Proportional to each other
D.
None of the above
Ans:
Equal to each other
Explanation :
The angle of repose or the critical angle of repose, of a granular material is the steepest angle of descent or dip of the slope relative to the horizontal plane when material on the slope face is on the verge of sliding. This angle is in the range 0°-90° .when bulk granular materials are poured onto a horizontal surface, a conical pile will form. The internal angle between the surface of the pile and the horizontal surface is known as the angle of repose and is related to the density, surface area and shapes of the particles, and the coefficient of friction of the material.
[17] If a boy sitting in a train, which is moving at a constant velocity, throws a ball straight up into the air, the ball will –
A.
Fall in front of him
B.
Fall behind him
C.
Fall into his hand
D.
None of the above
Ans:
Fall into his hand
Explanation :
If a person throws a ball vertically upwards in a moving train, it comes back to his hand. The moment the ball was thrown, the ball was also in motion alone with the person who had thrown the ball and the train. This is due to inertia of motion. So when the ball remains in the air, both the person and the ball move ahead by the same distance. This makes the ball to come back to his hand on its return.
[18] A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?
A.
Increase
B.
Decrease
C.
Remain constant
D.
Will increase first and then decrease
Ans:
Increase
Explanation :
Assuming the disc is uniform and isotropic (the same in different directions), the hole will expand in the same ratio as the metal. It is because the thermal expansion equation applies to all lengths associated with the metal, including the circumference of the hole, since the edge of the hole is made out of metal. And if the circumference of the hole expands, so does the diameter.
[19] Stars in the sky appear to twinkle due to –
A.
a series of refractions
B.
a series of reflections
C.
a surface tension phenomenon
D.
multiple diminishing brightness
Ans:
a series of refractions
Explanation :
The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. This means that some of the light reaches us directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.
[20] A pilot has to release the bomb to hit a target –
A.
right above the target
B.
beyond the target
C.
before the target
D.
None of these
Ans:
before the target
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it.
[21] Parabolic mirros are used in –
A.
Car headlights
B.
Driving mirrors
C.
Dentists mirros
D.
Shaving mirros
Ans:
Car headlights
Explanation :
A parabolic reflector (mirror) transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. Since the principles of reflection are reversible, parabolic reflectors can also be used to project energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights.
[22] Which atmospheric layer contains ozone layer?
A.
Genosphere
B.
Zonosphere
C.
Stratosphere
D.
Ionosphere
Ans:
Stratosphere
Explanation :
The ozone (O2) found in upper part of the atmosphere, i.e., Stratosphere, is Good ozone, since, it acts as a shield for absorbing UV-radiations from sun.
[23] Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid:
A.
increases
B.
decreases
C.
stays the same
D.
none of the above
Ans:
increases
Explanation :
0
[24] Which of the following is the best conductor of Electricity?
A.
Ordinary water
B.
Sea water
C.
Boiled water
D.
Distilled water
Ans:
Sea water
Explanation :
It sounds crazy, but it's true! This is because Sea water has Salt that is a good conductor of electricity. Salt molecules are made of sodium ions and chlorine ions.
[25] Rate of change of momentum is -
A.
Area
B.
Pressure
C.
Force
D.
Velocity
Ans:
Force
Explanation :
According to Newton’s Second Law of motion, the rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force.
Explanation :
If a person throws a ball vertically upwards in a moving train, it comes back to his hand. The moment the ball was thrown, the ball was also in motion alone with the person who had thrown the ball and the train. This is due to inertia of motion. So when the ball remains in the air, both the person and the ball move ahead by the same distance. This makes the ball to come back to his hand on its return.
[18] A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?
A.
Increase
B.
Decrease
C.
Remain constant
D.
Will increase first and then decrease
Ans:
Increase
Explanation :
Assuming the disc is uniform and isotropic (the same in different directions), the hole will expand in the same ratio as the metal. It is because the thermal expansion equation applies to all lengths associated with the metal, including the circumference of the hole, since the edge of the hole is made out of metal. And if the circumference of the hole expands, so does the diameter.
[19] Stars in the sky appear to twinkle due to –
A.
a series of refractions
B.
a series of reflections
C.
a surface tension phenomenon
D.
multiple diminishing brightness
Ans:
a series of refractions
Explanation :
The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. This means that some of the light reaches us directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.
[20] A pilot has to release the bomb to hit a target –
A.
right above the target
B.
beyond the target
C.
before the target
D.
None of these
Ans:
before the target
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it.
[21] Parabolic mirros are used in –
A.
Car headlights
B.
Driving mirrors
C.
Dentists mirros
D.
Shaving mirros
Ans:
Car headlights
Explanation :
A parabolic reflector (mirror) transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. Since the principles of reflection are reversible, parabolic reflectors can also be used to project energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights.
[22] Which atmospheric layer contains ozone layer?
A.
Genosphere
B.
Zonosphere
C.
Stratosphere
D.
Ionosphere
Ans:
Stratosphere
Explanation :
The ozone (O2) found in upper part of the atmosphere, i.e., Stratosphere, is Good ozone, since, it acts as a shield for absorbing UV-radiations from sun.
[23] Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid:
A.
increases
B.
decreases
C.
stays the same
D.
none of the above
Ans:
increases
Explanation :
0
[24] Which of the following is the best conductor of Electricity?
A.
Ordinary water
B.
Sea water
C.
Boiled water
D.
Distilled water
Ans:
Sea water
Explanation :
It sounds crazy, but it's true! This is because Sea water has Salt that is a good conductor of electricity. Salt molecules are made of sodium ions and chlorine ions.
[25] Rate of change of momentum is -
A.
Area
B.
Pressure
C.
Force
D.
Velocity
Ans:
Force
Explanation :
According to Newton’s Second Law of motion, the rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force.
Explanation :
The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. This means that some of the light reaches us directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.
[20] A pilot has to release the bomb to hit a target –
A.
right above the target
B.
beyond the target
C.
before the target
D.
None of these
Ans:
before the target
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it.
[21] Parabolic mirros are used in –
A.
Car headlights
B.
Driving mirrors
C.
Dentists mirros
D.
Shaving mirros
Ans:
Car headlights
Explanation :
A parabolic reflector (mirror) transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. Since the principles of reflection are reversible, parabolic reflectors can also be used to project energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights.
[22] Which atmospheric layer contains ozone layer?
A.
Genosphere
B.
Zonosphere
C.
Stratosphere
D.
Ionosphere
Ans:
Stratosphere
Explanation :
The ozone (O2) found in upper part of the atmosphere, i.e., Stratosphere, is Good ozone, since, it acts as a shield for absorbing UV-radiations from sun.
[23] Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid:
A.
increases
B.
decreases
C.
stays the same
D.
none of the above
Ans:
increases
Explanation :
0
[24] Which of the following is the best conductor of Electricity?
A.
Ordinary water
B.
Sea water
C.
Boiled water
D.
Distilled water
Ans:
Sea water
Explanation :
It sounds crazy, but it's true! This is because Sea water has Salt that is a good conductor of electricity. Salt molecules are made of sodium ions and chlorine ions.
[25] Rate of change of momentum is -
A.
Area
B.
Pressure
C.
Force
D.
Velocity
Ans:
Force
Explanation :
According to Newton’s Second Law of motion, the rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force.
Explanation :
A parabolic reflector (mirror) transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. Since the principles of reflection are reversible, parabolic reflectors can also be used to project energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights.
[22] Which atmospheric layer contains ozone layer?
A.
Genosphere
B.
Zonosphere
C.
Stratosphere
D.
Ionosphere
Ans:
Stratosphere
Explanation :
The ozone (O2) found in upper part of the atmosphere, i.e., Stratosphere, is Good ozone, since, it acts as a shield for absorbing UV-radiations from sun.
[23] Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid:
A.
increases
B.
decreases
C.
stays the same
D.
none of the above
Ans:
increases
Explanation :
0
[24] Which of the following is the best conductor of Electricity?
A.
Ordinary water
B.
Sea water
C.
Boiled water
D.
Distilled water
Ans:
Sea water
Explanation :
It sounds crazy, but it's true! This is because Sea water has Salt that is a good conductor of electricity. Salt molecules are made of sodium ions and chlorine ions.
[25] Rate of change of momentum is -
A.
Area
B.
Pressure
C.
Force
D.
Velocity
Ans:
Force
Explanation :
According to Newton’s Second Law of motion, the rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force.
Explanation :
0
[24] Which of the following is the best conductor of Electricity?
A.
Ordinary water
B.
Sea water
C.
Boiled water
D.
Distilled water
Ans:
Sea water
Explanation :
It sounds crazy, but it's true! This is because Sea water has Salt that is a good conductor of electricity. Salt molecules are made of sodium ions and chlorine ions.
[25] Rate of change of momentum is -
A.
Area
B.
Pressure
C.
Force
D.
Velocity
Ans:
Force
Explanation :
According to Newton’s Second Law of motion, the rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force.
Explanation :
According to Newton’s Second Law of motion, the rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force.