317 + Mcqs in Physics Page 4 McqOptions

151.	Statement A: While walking on ice, one should take small steps to avoid slipping. Statement B: This is because smaller steps ensure smaller friction.
A.	Statement A is correct.
B.	Statement B is correct.
C.	Both statements are correct.
D.	Both statements are incorrect.
Answer» B. Statement B is correct.

Discussion

152.	Column-I A.Rocket propulsionP.ForceB.Agent which causes AccelerationQ.MomentumC.Product of mass and VelocityR.S.I. unit of forceD.NewtonS.Law of Conservation momentum
A.	A\[\to \]S; B\[\to \]P; C\[\to \]R; D\[\to \]Q
B.	A\[\to \]P; B\[\to \]S; C\[\to \]R; D\[\to \]Q
C.	A\[\to \]S; B\[\to \]P; C\[\to \]Q; D\[\to \]R
D.	A\[\to \]P; B\[\to \]S; C\[\to \]Q; D\[\to \]R
Answer» D. A\[\to \]P; B\[\to \]S; C\[\to \]Q; D\[\to \]R

Discussion

153.	Two teams are pulling a rope with equal and opposite forces each of 5 kN in a tug of war so that a condition of equilibrium exists. What will be the tensile force in the rope? [NDA]
A.	Zero
B.	2.5 kN
C.	5 kN
D.	10 kN
Answer» D. 10 kN

Discussion

154.	A jet engine works on the principle of conservation of [NDA]
A.	linear momentum
B.	angular momentum
C.	energy
D.	mass
Answer» B. angular momentum

Discussion

155.	Statement A: When a gun is fired it recoils, i.e., it pushes back, with much less velocity than the velocity of the bullet. Statement B: Velocity of the recoiling gun is less because the gun is much heavier than the bullet. [CDS]
A.	Statement A is correct.
B.	Statement B is correct.
C.	Both statements are correct.
D.	Both statements are incorrect.
Answer» B. Statement B is correct.

Discussion

156.	It is difficult to cut things with a blunt knife because [CDS]
A.	the pressure exerted by knife for a given force increases with increase in bluntness
B.	a sharp edge decreases the pressure exerted by knife for a given force
C.	a blunt knife decreases the pressure for a given force
D.	a blunt knife decreases the area of intersection
Answer» D. a blunt knife decreases the area of intersection

Discussion

157.	Statement A: Pulling a lawn roller is easier than pushing it. Statement B: Pushing increases the apparent weight and hence the force of friction. [CDS]
A.	Statement A is correct.
B.	Statement B is correct.
C.	Both statements are correct.
D.	Both statements are incorrect.
Answer» B. Statement B is correct.

Discussion

158.	In cricket match, while catching a fast moving ball, a fielder in the ground gradually pulls his hands backwards with the moving ball to reduce the velocity to zero. The act represents [CDS]
A.	Newton's first law of motion
B.	Newton's second law of motion
C.	Newton's third law of motion
D.	Law of conservation of energy
Answer» C. Newton's third law of motion

Discussion

159.	Ball bearings are used in bicycles, cars, etc., because [IAS Prelim]
A.	the actual area of contact between the wheel and axle is increased
B.	the effective area of contact between the wheel and axle is increased
C.	the effective area of contact between the wheel and axle is reduced
D.	None of the above statements is correct
Answer» D. None of the above statements is correct

Discussion

160.	On the basis of following features identify the correct option. A. It is measured in units of kg m/s. B. Its direction is same as that of velocity of body.
A.	Momentum
B.	Inertia
C.	Both A and B
D.	Neither A and B
Answer» B. Inertia

Discussion

161.	A spherical body moves with a uniform angular velocity (w) around a circular path of radius r. Which one of the following statements is correct? [IAS Prelim]
A.	The body has no acceleration
B.	The body has a radial acceleration \[{{\omega }^{2}}r\] directed toward centre of path
C.	The body has a radial acceleration \[2/5{{\omega }^{2}}r\] directed away from the centre of the path
D.	The body has an acceleration \[{{\omega }^{2}}\] tangential to its path
Answer» C. The body has a radial acceleration \[2/5{{\omega }^{2}}r\] directed away from the centre of the path

Discussion

162.	Assertion [A]: A man standing on a completely frictionless surface can propel himself by whistling. Reason [R]: If no external force acts on a system, its momentum cannot change. [IAS Prelim]
A.	Both A and R are true and R is the correct explanation of A
B.	Both A and R are true but R is not a correct explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» C. A is true but R is false

Discussion

163.	Statement A: While drawing a line on a paper, friction force acts on paper in the same direction along which line is drawn on the paper. Statement B: Friction always opposes motion.
A.	Statement A is correct.
B.	Statement B is correct.
C.	Both statements are correct.
D.	Both statements are incorrect.
Answer» D. Both statements are incorrect.

Discussion

164.	An athlete diving off a high springboard can perform a variety of exercises in the air before entering the water below. Which one of the following parameters will remain constant during the fall? [CDS]
A.	The athlete's linear momentum
B.	The athlete's moment of inertia
C.	The athlete's kinetic energy
D.	The athlete's angular momentum
Answer» E.

Discussion

165.	If an object having mass of 1 kg is subjected to a force of 1 N it moves with [CDS]
A.	a speed of 1 m/s
B.	a speed of 1 km/s
C.	an acceleration of \[10\,m/{{s}^{2}}\]
D.	an acceleration of \[1\,m/{{s}^{2}}\]
Answer» E.

Discussion

166.	A man is at rest in the middle of a horizontal plane of perfectly smooth surface of ice. He can move himself to the shore by making use of Newton's [NDA]
A.	first law of motion
B.	second law of motion
C.	third law of motion
D.	first, second and third laws of motion
Answer» D. first, second and third laws of motion

Discussion

167.	Newton's laws of motion do not hold good for objects
A.	at rest
B.	moving slowly
C.	moving with high velocity
D.	moving with velocity comparable to velocity of light
Answer» E.

Discussion

168.	The working principle of a washing machine is: [IAS Prelim]
A.	centrifugation
B.	dialysis
C.	reverse osmosis
D.	diffusion
Answer» B. dialysis

Discussion

169.	In respect of the difference of the gravitational force from electric and magnetic forces, which one of the following statements is true?
A.	Gravitational force is stronger than the other two.
B.	Gravitational force is attractive only, whereas the electric and the magnetic forces are attractive as well as repulsive.
C.	Gravitational force has a very short range.
D.	Gravitational force is a long range force, while the other two are short range forces.
Answer» C. Gravitational force has a very short range.

Discussion

170.	If the moon is to escape from the gravitational field of the earth forever, it will require a velocity [SSC CGL]
A.	11.2 km/s
B.	less than
C.	slightly more than 111.2 km/s
D.	22.4 km/s
Answer» B. less than

Discussion

171.	Assertion [A]: A beaker filled with water at \[4{}^\circ C\]overflows if the temperature is decreased or increased.Reason [R]: Density of water is maximum at \[4{}^\circ C\].
A.	Both A and R are true and R is the correct explanation of A
B.	Both A and R are true but R is not a correct explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» B. Both A and R are true but R is not a correct explanation of A

Discussion

172.	Consider two hollow glass spheres, one containing water and the other containing mercury. Each liquid fills about one-tenth of the volume of the sphere. In zero gravity environment [NDA]
A.	water and mercury float freely inside the sphere
B.	water forms a layer on the glass, while mercury floats
C.	mercury forms a layer on the glass, while water floats
D.	water and mercury both form a layer on the glass
Answer» C. mercury forms a layer on the glass, while water floats

Discussion

173.	Why do two ice blocks join to form one block when pressed together? [NDA]
A.	Melting point of ice is lowered with increase in pressure
B.	Melting point of ice increases with increase in pressure
C.	Melting point of ice remains unchanged with increase in pressure
D.	Melting point of ice is \[0{}^\circ C\]
Answer» B. Melting point of ice increases with increase in pressure

Discussion

174.	When a ship floats on water [NDA]
A.	it displaces no water
B.	the mass of water displaced is equal to the mass of the ship
C.	the mass of water displaced is lesser than the mass of the ship
D.	the mass of water displaced is greater than the mass of the ship
Answer» E.

Discussion

175.	Two identical blocks of ice, A and B, float in water as shown in the figure given below. Which one among the following statements in this regard is correct? [NDA]
A.	Block A displaces a greater volume of water since the pressure acts on a smaller bottom area
B.	Block A displaces a greater volume of water since its submerged end is lower in the water.
C.	Block B displaces a greater volume of water since its submerged end has a greater area in water
D.	The two blocks displace equal volumes of water since they have the same specific gravity and same mass
Answer» E.

Discussion

176.	A liquid rises to a certain length in a capillary tube. The tube is inclined to an angle of \[45{}^\circ \]. The length of the liquid column will [NDA]
A.	increase
B.	decrease
C.	remain unchanged
D.	first decrease and then increase
Answer» D. first decrease and then increase

Discussion

177.	Dirty cloths containing grease and oil stains are cleaned by adding detergents to water. Stains are removed because detergent [CDS]
A.	reduces drastically the surface tension between water and oil
B.	increases the surface tension between water and oil
C.	increases the viscosity of water and oil
D.	decreases the viscosity in detergent mixed water
Answer» B. increases the surface tension between water and oil

Discussion

178.	A liquid is kept in a regular cylindrical vessel up to a certain height. If this vessel is replaced by another cylindrical vessel having half the area of cross-section of the bottom, the pressure on the bottom will [CDS]
A.	remain unaffected
B.	be reduced to half the earlier pressure
C.	be increased to twice the earlier pressure
D.	be reduced to one-fourth the earlier pressure
Answer» B. be reduced to half the earlier pressure

Discussion

179.	Assertion [A]: An iron ball floats on mercury but gets immersed in water.Reason [R]: The specific gravity of iron is more than that of mercury. [IAS Prelim]
A.	Both A and R are true and R is the correct explanation of A
B.	Both A and R are true but R is not a correct explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» D. A is false but R is true

Discussion

180.	Raw mangoes shrivel when pickled in brine. The phenomenon is associated with [CDS]
A.	osmosis
B.	reverse osmosis
C.	increase of surface tension of fluid
D.	decrease of surface tension of fluid
Answer» B. reverse osmosis

Discussion

181.	A geostationary satellite
A.	can move about any axis
B.	must move about the polar axis
C.	must move on an axis in the equatorial plane
D.	Both [b] and [c]
Answer» D. Both [b] and [c]

Discussion

182.	Consider the following statements: [IAS Prelim] 1. If there were no phenomenon of capillarity it would be difficult to use a kerosene lamp 2. one would not be able to use a straw to consume a soft drink 3. the blotting paper would fail to function 4. the big trees that we see around would not have grown on the Earth Which of the statements given above are correct?
A.	1, 2 and 3 only
B.	1, 3 and 4 only
C.	2 and 4 only
D.	1, 2, 3 and 4
Answer» C. 2 and 4 only

Discussion

183.	Three identical vessels A, B and C are filled with water, mercury and kerosene respectively up to an equal height. The three vessels are provided with identical taps at the bottom of the vessels. If the three taps are opened simultaneously, then which vessel is emptied first? [IAS Prelim]
A.	Vessel B
B.	All the vessels A, B and C will be emptied simultaneously
C.	Vessel A
D.	Vessel C
Answer» E.

Discussion

184.	Assertion [A]: With the increase of temperature, the viscosity of glycerine increases. [NDA]Reason [R]: Rise of temperature increases kinetic energy of molecules.
A.	Both A and R are true and R is the correct explanation of A
B.	Both A and R are true but R is not a correct explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» E.

Discussion

185.	A block of ice is floating in a beaker containing liquid of specific gravity greater than one. When ice melts completely what happens to the level of liquid in the beaker? [NDA]
A.	It will remain the same as before
B.	It will go down
C.	It will rise up
D.	It may or may not change depending upon size of beaker
Answer» D. It may or may not change depending upon size of beaker

Discussion

186.	The specific gravity of a substance is measured by a hydrometer at the sea level. If the measurement is done at the top of a mountain, what would be the specific gravity? [NDA]
A.	Zero
B.	More than that measured at the sea level
C.	Less than that measured at the sea level
D.	Same as that measured at the sea level
Answer» D. Same as that measured at the sea level

Discussion

187.	In scuba-diving, while ascending towards the water surface, there is a danger of bursting the lungs. It is because of [CDS]
A.	Archimedes' principle
B.	Boyle's law
C.	Gay-Lussac's law of combining volumes
D.	Graham's law of diffusion
Answer» C. Gay-Lussac's law of combining volumes

Discussion

188.	For which one of the following is capillarity not the reason? [IAS Prelim]
A.	Blotting of ink
B.	Rising of underground water
C.	Spread a water drop on a cotton cloth
D.	Rising of water from the roots of a plant to its foliage
Answer» C. Spread a water drop on a cotton cloth

Discussion

189.	If a gas is heated at constant pressure its isothermal compressibility
A.	increases with temperature
B.	remains constant
C.	decreases with temperature
D.	decreases inversely with temperature.
Answer» C. decreases with temperature

Discussion

190.	Flow velocities in an incompressible fluid can be measured with which one of the following? [NDA]
A.	Barometer
B.	Venturi tube
C.	Strain gauge
D.	Manometer
Answer» C. Strain gauge

Discussion

191.	Purity of a metal can be determined with the help of
A.	Pascal's law
B.	Boyle's law
C.	Archimedes principle
D.	Conservation of mass principle
Answer» D. Conservation of mass principle

Discussion

192.	When pressure exerted on an enclosed liquid or gas at rest, is transmitted equally in all the directions, is in accordance with:
A.	Pascal's law
B.	Boyle's law
C.	Archimedes' principle
D.	Principle of floatation
Answer» B. Boyle's law

Discussion

193.	Which type/types of pen uses/use capillary action in addition to gravity for flow of ink? [CDS]
A.	Fountain pen
B.	Ballpoint pen
C.	Gel pen
D.	Both ballpoint and gel pens
Answer» B. Ballpoint pen

Discussion

194.	The tendency of a liquid drop to contract and occupy minimum area is due to: [IAS Prelim]
A.	surface tension
B.	viscosity
C.	density
D.	vapour pressure
Answer» B. viscosity

Discussion

195.	Kerosene oil rises up in a wick of lantern because of
A.	capillarity
B.	buoyant force
C.	diffusion of oil through the wick
D.	None of the above
Answer» B. buoyant force

Discussion

196.	A body is at rest on the surface of earth. Which of the following statements is correct? [SSC CGL]
A.	Only weight of the body acts on it.
B.	Only upward force acts on the body.
C.	Frictional force acts on the body.
D.	Net upward force is equal to the net downward force.
Answer» E.

Discussion

197.	Assertion [A]: Space rocket are usually launched in the equatorial line from west to eastReason [R]: The acceleration due to gravity is minimum at the equator.
A.	Both A and R are true and R is the correct explanation of A
B.	Both A and R are true but R is not the correct explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» C. A is true but R is false

Discussion

198.	Which one among the following is the correct value of the gravitational force of the Earth acting on a body of mass 1 kg?
A.	8.9 N
B.	9.8 N
C.	89 N
D.	98 N
Answer» C. 89 N

Discussion

199.	Which one of the following statements regarding artificial satellite of the earth is incorrect?
A.	The orbital velocity depends on the mass of the satellite
B.	A minimum velocity of 8 km/s is required by a satellite to orbit quite close to the earth
C.	The period of revolution is large if the radius of its orbit is large
D.	The height of a geostationary satellite is about 36000 km from the earth.
Answer» B. A minimum velocity of 8 km/s is required by a satellite to orbit quite close to the earth

Discussion

200.	Assertion [A]: Gravitational attraction is a central force and therefore in motion of planets in the solar system, the angular momentum is conserved.Reason [R]: In the motion of planets of the solar system, equal areas are swept in equal time.
A.	Both A and R are true and R is the correct explanation of A
B.	Both A and R are true but R is not the correct explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» B. Both A and R are true but R is not the correct explanation of A

Discussion

Explore topic-wise MCQs in UPSC IAS Exam.

Statement A: While walking on ice, one should take small steps to avoid slipping. Statement B: This is because smaller steps ensure smaller friction.

Column-I A.Rocket propulsionP.ForceB.Agent which causes AccelerationQ.MomentumC.Product of mass and VelocityR.S.I. unit of forceD.NewtonS.Law of Conservation momentum

Two teams are pulling a rope with equal and opposite forces each of 5 kN in a tug of war so that a condition of equilibrium exists. What will be the tensile force in the rope? [NDA]

A jet engine works on the principle of conservation of [NDA]

Statement A: When a gun is fired it recoils, i.e., it pushes back, with much less velocity than the velocity of the bullet. Statement B: Velocity of the recoiling gun is less because the gun is much heavier than the bullet. [CDS]

It is difficult to cut things with a blunt knife because [CDS]

Statement A: Pulling a lawn roller is easier than pushing it. Statement B: Pushing increases the apparent weight and hence the force of friction. [CDS]

In cricket match, while catching a fast moving ball, a fielder in the ground gradually pulls his hands backwards with the moving ball to reduce the velocity to zero. The act represents [CDS]

Ball bearings are used in bicycles, cars, etc., because [IAS Prelim]

On the basis of following features identify the correct option. A. It is measured in units of kg m/s. B. Its direction is same as that of velocity of body.

A spherical body moves with a uniform angular velocity (w) around a circular path of radius r. Which one of the following statements is correct? [IAS Prelim]

Assertion [A]: A man standing on a completely frictionless surface can propel himself by whistling. Reason [R]: If no external force acts on a system, its momentum cannot change. [IAS Prelim]

Statement A: While drawing a line on a paper, friction force acts on paper in the same direction along which line is drawn on the paper. Statement B: Friction always opposes motion.

An athlete diving off a high springboard can perform a variety of exercises in the air before entering the water below. Which one of the following parameters will remain constant during the fall? [CDS]

If an object having mass of 1 kg is subjected to a force of 1 N it moves with [CDS]

A man is at rest in the middle of a horizontal plane of perfectly smooth surface of ice. He can move himself to the shore by making use of Newton's [NDA]

Newton's laws of motion do not hold good for objects

The working principle of a washing machine is: [IAS Prelim]

In respect of the difference of the gravitational force from electric and magnetic forces, which one of the following statements is true?

If the moon is to escape from the gravitational field of the earth forever, it will require a velocity [SSC CGL]

Assertion [A]: A beaker filled with water at \[4{}^\circ C\]overflows if the temperature is decreased or increased.Reason [R]: Density of water is maximum at \[4{}^\circ C\].

Consider two hollow glass spheres, one containing water and the other containing mercury. Each liquid fills about one-tenth of the volume of the sphere. In zero gravity environment [NDA]

Why do two ice blocks join to form one block when pressed together? [NDA]

When a ship floats on water [NDA]

Two identical blocks of ice, A and B, float in water as shown in the figure given below. Which one among the following statements in this regard is correct? [NDA]

A liquid rises to a certain length in a capillary tube. The tube is inclined to an angle of \[45{}^\circ \]. The length of the liquid column will [NDA]

Dirty cloths containing grease and oil stains are cleaned by adding detergents to water. Stains are removed because detergent [CDS]

A liquid is kept in a regular cylindrical vessel up to a certain height. If this vessel is replaced by another cylindrical vessel having half the area of cross-section of the bottom, the pressure on the bottom will [CDS]

Assertion [A]: An iron ball floats on mercury but gets immersed in water.Reason [R]: The specific gravity of iron is more than that of mercury. [IAS Prelim]

Raw mangoes shrivel when pickled in brine. The phenomenon is associated with [CDS]

A geostationary satellite

Three identical vessels A, B and C are filled with water, mercury and kerosene respectively up to an equal height. The three vessels are provided with identical taps at the bottom of the vessels. If the three taps are opened simultaneously, then which vessel is emptied first? [IAS Prelim]

Assertion [A]: With the increase of temperature, the viscosity of glycerine increases. [NDA]Reason [R]: Rise of temperature increases kinetic energy of molecules.

A block of ice is floating in a beaker containing liquid of specific gravity greater than one. When ice melts completely what happens to the level of liquid in the beaker? [NDA]

The specific gravity of a substance is measured by a hydrometer at the sea level. If the measurement is done at the top of a mountain, what would be the specific gravity? [NDA]

In scuba-diving, while ascending towards the water surface, there is a danger of bursting the lungs. It is because of [CDS]

For which one of the following is capillarity not the reason? [IAS Prelim]

If a gas is heated at constant pressure its isothermal compressibility

Flow velocities in an incompressible fluid can be measured with which one of the following? [NDA]

Purity of a metal can be determined with the help of

When pressure exerted on an enclosed liquid or gas at rest, is transmitted equally in all the directions, is in accordance with:

Which type/types of pen uses/use capillary action in addition to gravity for flow of ink? [CDS]

The tendency of a liquid drop to contract and occupy minimum area is due to: [IAS Prelim]

Kerosene oil rises up in a wick of lantern because of

A body is at rest on the surface of earth. Which of the following statements is correct? [SSC CGL]

Assertion [A]: Space rocket are usually launched in the equatorial line from west to eastReason [R]: The acceleration due to gravity is minimum at the equator.

Which one among the following is the correct value of the gravitational force of the Earth acting on a body of mass 1 kg?

Which one of the following statements regarding artificial satellite of the earth is incorrect?

Assertion [A]: Gravitational attraction is a central force and therefore in motion of planets in the solar system, the angular momentum is conserved.Reason [R]: In the motion of planets of the solar system, equal areas are swept in equal time.