ECAT Physics Fluid Dynamics Chapter Online Test

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Physics

1. The blood vessels are inflated even in

None of these

Occasionally

Working state between heart beat

Relaxed states between heart beat

2. Two water pipes of diameters 2 cm and 4 cm are connected with main supply line. The velocity of flow of water in the pipe 2 cm diameter is

4 times

½ of 4 cm diameter pipe

¼ times

Twice

3. Substance which flows easily are

All of these

Water

Petrol

Kerosene oil

4. Terminal velocity of the body is directly proportional to the

Size of the body

Diameter of the body

Radius of the body

Square of the diameter of the body

5. A pendulum bob is suspended inside a lift moving upward with constant velocity. If mass of the bob is 50 g then its weight inside the compartment is

0.5 N

Zero

N

0.05 N

6. In a uniform circular motion (horizontal) of a ball tied with a string, velocity at any time is at any angle θ with acceleration, then θ is

θ = 90°

θ = 60°

θ = 30°

None of these

7. The Systolic blood pressure comes when

Cutting off the blood flow

Vessel collapse

All of these

None of these

8. In a surface tension experiment with a capillary tube water rises up to 0.1 m. If the same experiment is repeated on an artificial satellite, which is revolving around the earth, water will rise in the capillary tube up to a height of

Full length of the capillary tube

0.1 m

0.98 m

0.2 m

9. The angular momentum of a body is conserved if

Torque acting on it is zero

Force acting on it is constant

Torque acting on it is constant

Force acting on it is zero

10. If the earth suddenly stops rotating the value of ‘g’ at equator would:

Become zero

Remain unchanged

Increase

Decrease

11. A body whose momentum is constant, must have constant:

Velocity

Force

None of these

Acceleration

12. At terminal velocity, fluid friction is

None of these

Zero

Minimum

Maximum

13. Length cannot be measured by

Debye

Micron

Light year

Fermi

14. Which of the following sets of concurrent forces may be in equilibrium?

F₁ – 3 N, F₂ – 5 N, F₃ = 9 N

F₁ – 3 N, F₂ – 5N, F₃ = 15 N

F₁ – 3 N, F₂ – 5N, F₃ = 6 N

F₁ – 3 N, F₂ – 5 N, F₃ = 1 N

15. A force of 10 N displace an object by 10 m. If work done is 50 J then direction of force makes an angle with direction of displacement.

90°

120°

None of these

60°

16. Two projectiles are fired from the same point with the same speed at angles of projection 60° and 30° respectively. Which one of the following is true?

Their landing velocity will be same

Their maximum height will be same

Their time of flight will be same

Their range will be same

17. Which of the following substances has high resistance to flow?

All of these

Honey

Mobile oil

Thick tar

18. As the droplet accelerates the net force acting on it is

Zero

Decreases

Increase

None of these

19. If the acceleration due to gravity is 10 ms¯² and the units of length and time are changed to kilometer and hour respectively, the numerical value of acceleration in

129600

72000

360000

36000

20. If v is the velocity of flow of liquid through a tube of area of cross-section A, then according to equation of continuity

None of these

A/v = constant

v/A = constant

Av = constant

21. A car travels first half distance between two places with a speed of 30 km/h and remaining half with a speed of 50 km/h. The average speed of the car is

40 km/h

42 km/h

10 km/h

37.5 km/h

22. The apparent loss in weight of the block in the liquid is

21 N

60 N

30 N

15 N

23. At the top of the trajectory of a projectile, the directions of its velocity and acceleration are

Perpendicular to each other

Antiparallel to each other

Parallel to each other

Inclined to each other at an angle of 45°

24. A truck and a car are moving with equal velocity. On applying the brake both will stop after certain distance then

None of these

Car will cover less distance before rest

Both will cover equal distance

Truck will cover less distance before rest

25. Viscosity of water at 30° C in Nms¯²

0.521 x 10¯³

0.564 x 10¯³

0.594 x 10¯³

0.599 x 10¯³

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26. The K.E. of a light and a heavy object is same. Which object has maximum momentum?

Light object

Data is not sufficient

Heavy object

Both have the same momentum

27. A stone is dropped from rest from the top of a tower 19.6 m high. The distance traveled during the last second of its fall is (giving g = 9.8 m/s²)

4.9 m

14.7 m

19.6 m

9.8 m

28. A ball is dropped from a certain height and another ball is projected horizontally from the same point. Which of the following statements is correct?

The change of velocity during the path for both balls is the same

Both hit the ground at the same speed

The change of speed during the path for both balls is the same

Both hit the ground at the same velocity

29. A ball whose kinetic energy is E, is thrown at an angle of 45° with the horizontal, its kinetic energy at the highest point of its flight will be

Zero

E/2

E

F/√2

30. Two force are such that then sum of their magnitudes is 18 N and their resultant is perpendicular to the smaller forces and the magnitude of resultant is 12. Then the magnitude of the forces are.

10 N, 8 N

16 N, 2 N

13 N, 5 N

12 N, 6 N

31. The fluid which is incompressible and non-viscous is called:

All

Ideal fluid

Non-ideal fluid

Prefect fluid

32. An instrument called a sphygmomanometer measure

Milk density

Density of water

Blood pressure

None of these

33. Velocity of fluid increases where the pressure is

Constant

Low

Changes continuously

High

34. The ratio of the numerical values of the average velocity and average speed of a body is always.

Unity or less

Unity or more

Unity

Less than unity

35. The concentration of red blood cells in blood is

~ 30%

– 40%

~ 50%

– 45%

36. Viscosity of acetone at 30° C in Nsm¯²

0.295 x 10¯³

0.198 x 10¯³

0.301 x 10¯³

0.224 x 10¯³

37. Reason of weightlessness in a satellite is

Zero reaction force by satellite surface

Zero gravity

Center of mass

None of these

38. The smooth or steady stream-line flow is know as

Both a and b

None of these

Turbulent flow

Laminar flow

39. A body moving in a circular path with constant speed has

Variable acceleration

Constant retardation

Variable speed and constant velocity

Constant acceleration

40. Two boats rowing close to one another tend to collide. This is due to the

Both A and B

Air velocity between the narrow gap increases

None

Pressure between the narrow gap decreases

41. With the increase of temperature viscosity

Remains same

Decrease

Doubles

Increase

42. A particle of mass ‘m’ at rest is acted upon by a force ‘P’ for a time ‘t’. Its kinetic energy after an interval ‘t’ is

P²t²/3m

Pt/2m

P²t²/m

P²t²/2m

43. A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards?

1 m/s

0.01 m/s

10 m/s

0.1 m/s

44. If solid sphere and solid cylinder of same mass and density rotate about their own axis, the moment of inertia will be greater for

Both

Solid sphere

Equal both

Solid cylinder

45. A railway engine (mass 10⁴ kg) is moving with a speed of 73 km/h. The force which should be applied to bring it to rest over a distance of 20 m is

10,000 N

7,200 N

3,600 N

100,000 N

46. For keeping a body in circular motion, the force required is

Centrifugal

Centripetal

Tangential

Radial

47. Water is filled up to a height ‘H’ in a tank. A hole is made at depth ‘H’ below the water level. The velocity of efflux of the fluid is.

√gh

.gh

2gh

√2gh

48. A motorcycle driver double its velocity when he is having a turn. The force exerted outwardly will by

Double

4 times

¼ time

Half

49. If an object weighs 90 N in air, 60 N in water, and 20 N in an unknown liquid in which it does not dissolve, the so. Gr. Of the unknown liquid is

1.3

3.0

1.5

2.3

50. If rope of lift breaks suddenly. The tension exerted by the surface of life is (a = Acceleration of lift)

M(g + a)

M(g – a)

0

Mg

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51. The equation of continuity of fluid is based on the

All of these

Law of conservation of energy

Law of conservation of mass

Law of conservation of momentum

52. The physical quantity which has the dimensional formula M¹T¯³ is

Surface tension

Compressibility

Solar constant

Density

53. Find the total displacement of a body in 8 seconds starting from rest with an acceleration of 20 cm/s²

64 cm

0.064 m

64 m

640 cm

54. Two bodies with kinetic energies in the ratio of 4 : 1 are moving with equal linear momentum. The ration of their masses is

1 : 4

4 : 1

1 : 2

1 : 1

55. The acceleration of a motor car is 8 m/s². If the diameter of its wheel be 2 meter, its angular acceleration will be

16 m/s²

16 radian/s²

8 radian/s²

8 m/s²

56. A ball of mass m₁ and another ball of mass m₂ are dropped from equal heights. If time taken by the balls are t₁ and t₂ respectively then

t₁ = t₂/4

t₁ = t₂/2

t₁ = t₂

t₁ = 4t₂

57. The atmosphere is held to the earth by

Clouds

Winds

The rotation of earth

Gravity

58. Angular momentum is

Axial vector

Scalar

Polar vector

At 45° angle

59. The number of significant figures in all the given number 25.12, 2009, 4.156 and 1.257 x 10¯⁴ is

4

3

1

2

60. Which of the following quantities is a vector

Temperature

Density

Volume

Displacement

61. Water is filled up to a height ‘H’ in a tank. A hole is made at depth ‘h’ below the water level. The velocity of efflux of the fluid is

√2gh

√gh

gh

2gh

62. Which of the following is true?

Both momentum and kinetic energy are conserved in all collisions

Momentum is conserved in all collisions but kinetic energy is conserved only in inelastic collisions

Neither momentum nor kinetic energy is conserved in inelastic collisions

Momentum is conserved in all collisions but not kinetic energy

63. A boat of mass 40 kg is at rest. A dog of mass 4 kg moves in the boat with a velocity of 10 m/s. What is the velocity of boat?

4 m/s

1 m/s

2 m/s

8 m/s

64. The percentage errors in the measurement of mass and speed are 3% and 4% respectively. The maximum error in the measurement of kinetic energy is:

8%

11%

9%

10%

65. At high speeds the force is no longer

No proportion

Proportional

Simply proportional

None of these

66. The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

1/R

R²

R

(1/R)²

67. A light body A and a heavy body B have equal linear momentum. Then the K.E. of the body A

Is smaller than that of B

Is equal to that of B

Is greater than that of B

Is zero

68. The Drag force increases as the speed of the object

Decreases rapidly

Decreases

None of these

Increases

69. Swimming is based on the principle of

Newton’s 3rd law

Newton’s 2nd law

Newton’s 1st law

All

70. In case of streamed lined flow of liquid, the loss of energy is

Infinite

Maximum

Equal to what is in turbulent flow

Minimum

71. With increase of temperature, the viscosity of liquid and gases

Increase for liquids and decreases for gases

Decrease for both

Decrease for liquids and increase for gases

Increases for both

72. A force of 50 dynes is acted on a body of mass 5 g which is at rest, for an interval of 3 seconds, then impulse is

0.15 x 10¯³ Ns

1.5 x 10¯³ Ns

0.98 x 10¯³ Ns

2.5 x 10¯³ Ns

73. Two insoluble objects seem to lose the same weight when completely submerged in a liquid. The objects must have the same

Weight in water

Density

Weight in the liquid

Weight in air

74. When body moves with terminal velocity the acceleration in the body become

Zero

Infinite

Maximum

Variable

75. When the velocity of a liquid flowing steadily in a tube increases, its pressure?

Zero

Remains same

Decreases

Increases

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76. The dimensions of the quantities in one of the following pairs are the same. Identify the pairs.

Angular momentum and work

Torque and work

Energy and Young’s modulus

Light year and time

77. The two thin tubes which show most correctly the behavior of water are

2 and 3

3 and 4

1 and 2

4 and 5

78. The terminal velocity of for a water droplet of radius 10¯⁵ m is of the order of

1 cm/s

1 μm/s

1 mm/s

1 nm/s

79. A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that

Its acceleration is constant

Its kinetic energy is constant

Its moves in straight line

Its velocity is constant

80. Above a certain velocity the fluid flow, the motion of the fluid becomes:

Irregular

Unsteady

B and C

Steady

81. If vectors P, Q and R have magnitude 5, 12 and 13 units and P + Q = R, the angle between Q and R is

cos¯¹12/13

cos¯¹ 5/13

cos¯¹ 7/13

cos¯¹ 5/12

82. Deep water almost runs still when surface water flow in rivers. What does it explains

Surface energy

Magnus effect

Bernoulli’s equation

Equation of continuity

83. A ball is dropped downwards After 1 second another ball is dropped downwards from the same point. What is the distance between them after 3 seconds?

50 m

25 m

20 m

9.8 m

84. Bernoulli’s equation is based upon law of conservation of

Momentum

Energy

None

Mass

85. The energy associated with an electron of velocity 10⁶ m/s is:

4.5 x 10¯¹⁰ J

4.5 x 10¯¹⁹ J

3 x 10¯¹⁰ J

3 x 10¯¹⁹ J

86. A body of mass 5 kg is moving with a momentum of 10 kg m/s. A force of 0.2 N acts on it in the direction of motion of the body for 10 seconds. The increase in its kinetic energy is

3.2 joule

3.8 joule

2.8 joule

4.4 joule

87. For a body moving with constant speed in a horizontal circle, which of the following remains constant?

Acceleration

Velocity

Centripetal force

Kinetic energy

88. Which of the following is not a perfectly inelastic collision?

Striking of two glass balls

An electron captured by a proton

A man jumping onto a moving cart

A bullet striking a bag of sand

89. When a bicycle is in motion but not pedaled, the force of friction exerted by the ground on the two wheels is such that it acts

In the backward direction on both the wheels

In the forward direction on bath the wheels

In the forward direction on the front wheel and in the backward direction on the rear wheel

In the backward direction on the front wheel and in the forward direction on the rear wheel

90. If v is the velocity of flow of liquid through a tube of area of cross-section A, then according to equation of continuity

A/v = constant

Av = constant

None

v/A = constant

91. Which of these statements is not correct?

Moment of inertia does not depend on mass of body

Moment of inertia is independent of shape and size of the body

Moment of inertia depends on choice of axes

None of these

92. The term Brownian movement refers to

The stretching of a body beyond its elastic limit

Convection currents in a liquid or gas

Convection currents in a gas but not in a liquid

Irregular motions of small particles suspended in a fluid

93. Pick out the wrong pair:

Charge-coulomb

Temperature-thermometer

Sp. gravity-hygrometer

Pressure-barometer

94. If a train traveling at 72 kmph is to be brought to rest in a distance of 200 meters, then its retardation should be

20 ms¯²

10 ms¯²

2 ms¯²

1 ms¯²

95. Which of the following quantity is dimensionless?

Gravitational constant

None of these

Power of lens and gas constant

Plank’s constant

96. A projectile on its path gets divided into two pieces at its highest point. Which is true?

Kinetic energy increases

Momentum decreases

Kinetic energy decreases

Momentum increases

97. Drag force is given by

Pascal’s law

Stokes law

Gauss law

Newton’s law

98. S.I unit of magnetic flux is

Weber per metre

Weber metre¯²

Weber

Weber per metre⁴

99. Angular momentum of a body is defined as the product of

Linear velocity and angular velocity

Centripetal force and radius

Moment of inertia and angular velocity

Mass and angular velocity

100. Angular momentum is

Neither A. nor B.

Either A. or B.

A vector

A scalar

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101. The unit of Planck’s constant h is same as that of

Linear momentum

Angular momentum

Energy

Work

102. The range of projectile is 50 m when θ is inclined with horizontal at 15°. What is the range when θ becomes 45°?

100 m

300 m

200 m

400 m

103. Viscosity of glycerin at 30° C in Nsm¯²

6.12 x 10¯³

6.18 x 10¯³

6.29 x 10¯³

6.49 x 10¯³

104. When the fluid is in-compressible, for which the density is

Constant

None of these

Both

Change

105. If we move from equator to pole, value of g

Increases

Remains same

Decreases

First A and Then B

106. The escape velocity from the earth’s surface is 11 km/s. A certain planet has a radius twice that of the earth but its mean density is the same as that of the earth. The value of the escape velocity from this planet would be:

16.5 km/s

11 km/s

5.5 km/s

22 km/s

107. The direction of the angular velocity vector is along

The tangent to the circular path

The inward radius

The axis of rotation

The outward radius

108. Ball pen functions on the principle of

Boyle’s law

Surface tension

Gravitational force

Viscosity

109. Fire fighters have a jet attached to the head of their water pipes in order to:

Increase the volume to water flowing out

Increase the volume to water flowing per second

Increase the mass of water flowing per second

Avoid wastage of water

110. Equation of continuity is obtained by apply in law of conservation of

Mass

All

Momentum

Energy

111. Even the small viscosity of the air causes a retarding force on car at high speed is

Small

None of these

Large

Very large

112. The unit of inductance is equivalent to

Volt x second/ampere

Volt/ampere x second

Volt x ampere/second

Ampere/volt x second

113. At high altitude the blood oozes out of the nose and near because

The percentage of oxygen in the air increase

The blood pressure increase at high altitudes

The atmospheric pressure decreases there

The density of blood decreases at high altitudes

114. Which of the following statements for an object in equilibrium is not true?

The object must be at rest

The object can be at rest

The acceleration of the object is zero

The object is moving at constant speed

115. A container has a small hole in the bottom. Air can go through this hole, but water cannot. This can be best explained by the statement that

Water molecules are larger than molecules in the air

Surface tension of the water prevents it from

Water molecules are smaller than molecules in the air

Water contains hydrogen atoms, air does not

116. Which one of the following groups have quantities that do not have the same dimensions?

Velocity, speed

Work, energy

Force, impulse

Pressure, stress

117. The unit of focal power of a lens is

Watt

Diopter

Horse power

Kilo watt

118. A chimney works best when it is

Exposed to air currents

Not tall but wide

Tall

A and B

119. The resultant of two equal force is double of either of the force. The angle between them is

60°

90°

0°

120°

120. The rectangular components of force 5 dyne are

2 and 3 dyne

3 and 4 dyne

1 and 2 dyne

2.5 and 25 dyne

121. The blood pressure of the person

Increases with age

Remains the same

None

Decreases with age

122. A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of particle. The motion of the particle takes place in a horizontal plane. It follows

Linear momentum is constant

Velocity is constant

None of these

It moves in a circular path

123. The mass of the block is

30001 b

3000 g

21,000 g

None of these

124. The Bernoulli’s equation is based on the

Law of conservation of energy

All of these

Law of conservation of momentum

Law of conservation of mass

125. Surface tension of water is reduced by adding

Both A and B

Camphor

Plastic

Detergents

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126. Stoke’s law is applicable to

Motion through horizontal surface

Motion through free space

Motion through viscous medium

Motion through non-resistive medium

127. What is the weight of a 700 g of body on a planet whose mass is 1/7th of that of earth and radius is ½ of earth?

400 gf

300 gf

500 gf

700 gf

128. Dot product of two mutual perpendicular vector is:

1

0

None of these

∞

129. Force of friction is present in

Liquid

Gases

All of these

Solid

130. The pressure will be low where the speed of the fluid is

Low

Constant

Zero

High

131. In case of uniform circular motion which of the following physical quantity do not remain constant?

Momentum

Mass

Speed

Kinetic energy

132. If a body starts from rest and travels 120 cm in the 6th second then what is the acceleration?

0.218 m/s²

0.027 m/s²

0.20 m/s²

0.03 m/s²

133. The vector sum of two forces is perpendicular to their vector difference. In that case, the forces

Cannot be predicted

Are not equal to each other in magnitude

Are equal to each other in magnitude

Are equal to each other

134. A car is moving high velocity when it takes a turn. A force acts on it outwardly because of

Centripetal force

Centrifugal force

All of these

Gravitational force

135. A jet engine works on the principle of

Conservation of linear momentum

Conservation of mass

Conservation of energy

Conservation of angular momentum

136. A body is floating in a liquid. The up thrust on the body is

Weight of body-weight of liquid displaced

Less than the weight of liquid displaced

Zero

Equal to weight of liquid displaced

137. A body is thrown from a height h with speed u, it hits the ground with speed V

The value of V does not depend on the direction of which it is thrown

The value of V is maximum if the body is thrown vertically upwards

The value of V is minimum if the body is thrown horizontally

The value of V is maximum if the body is thrown vertically downward

138. If a particle covers half the circle of radius R with constant speed then

Momentum change is mvr

Change in KE is mv²

Change in KE is ½ mv²

Change in KE is zero

139. A 50 kg man with 20 kg load on his head climbs up 20 steps of 0.25 m height each. The work done in climbing is

3430 J

350 J

5 J

100 J

140. Burnoullis equation is obtained by applying law of conservation of _________.

Mass

Momentum

Energy

Fluid

141. If a force acts on a body, whose action line does not pass through its center of gravity, then the body will experience

None of these

Linear acceleration

No acceleration

Angular acceleration

142. The force exerted by the fluid in a hydraulic press on the piston is 2000 N. If the area of the piston is 10 cm², the fluid pressure on the piston is, in N/cm²

20,000

200

2000

20

143. When a body moves in a circular path, no work is done by the force since.

The force is always away from the center

Force and displacement are perpendicular to each other

There is no displacement

There is no net force

144. Two forces of 4 dyne and 3 dyne act upon a body. The resultant force on the body can only be

More than 3 dynes

Between 3 and 4 dyne

More than 4 dynes

Between 1 and 7 dyne

145. Moment of inertia of an object does not depend upon

Axis of rotation

Mass of object

Angular velocity

Mass distribution

146. The dimensions of Planck’s constant is equal to that of

Energy

Power

Momentum

Angular momentum

147. The relation P₁ – P₂ = ½ PV₂² shows the

Bernoulli’s equation

Venturi relation

None of these

Torricelli’s theorem

148. In Torricelli’s theorem, the speed of efflux is equal to

Action of gravity

None of these

h₁ – h₂

(h₁ – h₂) and falling under gravity

149. Identify the pair whose dimensions are equal

Force and stress

Force and work

Torque and work

Stress and energy

150. The rain drop falling from the sky reach the ground with

Constant acceleration (g)

Constant terminal velocity

Variable acceleration

Variable speed

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151. A particle is moving in a circle with uniform speed v. In moving from a point to another diametrically opposite point,

The kinetic energy changes by mv²

The momentum changes by 2mv

The momentum changes by mv

The kinetic energy changes by (1/2)mv²

152. If the force applied is F and the velocity gained is v, then the power developed is

v/F

Fv²

F/v

Fv

153. The maximum and minimum magnitudes of the resultant of two given vectors are 17 units and 7 units respectively. If these two vectors are at right angles to each other, the magnitude of their resultant is

18

13

14

16

154. Angular momentum has the same unit as

Power x time

Work x frequency

Linear momentum x time

Impulse x distance

155. Wb/m² is equal to

Watt

Dynes

Tesla

Henry

156. The angular momentum of a system of particles is not conserved

When net external force is acting upon the system

When a net external impulse is acting upon the system

When a net eternal torque is acting upon the system

None of these

157. If force and displacement of particle in the direction of force are doubled. Work would be

¼ times

Half

Double

4 times

158. A chimney works best if air exposed to the chimmey is

Moving fast

Stationary

Moving slowly

Moving

159. The minimum force required to move a body of mass m vertically upward is:

Mg

More than mg

More than 2mg

Mg/2

160. If a person with a spring balance and a body hanging from it goes up and up in an airplane, then the reading of the weight of the body as indicated by the spring balance, will

Remains the same

Go on decreasing

Go no increasing

First increase and then decrease

161. For a given angle of projection, if the time of flight of a projectile is doubled, the horizontal range will increases to:

Thrice

Twice

Four times

Once

162. Height at which value of ‘g’ become one-fourth to hat on earth is:

(3/2)R

4R

R

2R

163. In an elevator moving vertically up with an acceleration ‘g’, the force exerted on the floor by a passenger of mass M is

Mg

Zero

½ Mg

2 Mg

164. Two bullets are fired simultaneously, horizontally and with different speeds from the same place. Which bullet will hit the ground first?

The faster one

Both will reach simultaneously

Depends on their mass

The slower one

165. If water rises 4 cm in a long, thin tube because of capillary action, then, under corresponding conditions of use, the rise (in the tube) of a liquid whose density is 2 glcm³ will be

1 cm

8 cm

2 cm

None

166. The mass of fluid passing through any cross-section per unit time is called

Both a and b

Mass flux

Electric flux

Magnetic flux

167. At systolic pressure, at the point the first surges of blood flow through the narrow stricture produces

Initially turbulent

High flow speed

All of these

Sound heard

168. The momentum of particle is numerically equal to its kinetic energy. What will be the velocity of the particle?

None of these

2 m/s

4 m/s

1 m/s

169. A train is moving with a velocity of 25 m/s and a car is moving behind it by a velocity of 8 m/s in same direction. The relative velocity of train with respect to car is

17.5 m/s

33 m/s

17 m/s

None of these

170. When a horse pulls a cart, the force that makes the horse run forward is the force exerted by

The horse on the ground

The ground on the cart

The horse on the cart

The ground on the horse

171. A man standing near a fast moving train may fall

Away from the train

On himself

Towards the train

On the train

172. When fluid is incompressible then

Volume of the fluid is constant

Velocity of the fluid is constant

Flow of the fluid is straight line

Density of the fluid is constant

173. The kinetic energy of a body of mass 2 kg and momentum of 2 Ns is

1 J

3 J

2 J

4 J

174. The velocity of falling raindrops attains limited value because of

Up thrust of air

Viscous force exerted by air

Surface tension effect

Air currents of the earth atmosphere

175. If unit of length, mass and time each be double, the unit of work done is increased by

6 times

8 times

4 times

2 times

Page 8 of 11

176. Blood has a density

Equal to water

None of these

Lesser then water

Greater then water

177. Two forces of 12 N and 8 N act upon a body. The resultant force on the body has a maximum value of:

20 N

8 N

4 N

0 N

178. The length breadth and thickness of a block are given by 1 = 12 cm, b = 6 cm and t = 2.45 cm, the volume of the block according to the idea of significant figures should be:

1.763 x 10² cm³

2 x 10² cm³

1 x 10² cm³

None of these

179. The high blood pressure is

100 torr

120 torr

110 torr

130 torr

180. Stokes law is applicable if body has ___________ shape.

Square

Rough

Spherical

Circular

181. The centripetal force for a car moving on a road is given by

The drive of the car

Force by steering wheel

Friction due to tyres

Force of brakes

182. The maximum velocity of an object falling freely through air is called

Terminal velocity

Initial velocity

Final velocity

Instantaneous velocity

183. A pendulum of time period T is kept suspended in a train accelerating uniformly, then its time period

Decreases

Remains unchanged

None of these

Increases

184. The maximum drag force on a falling sphere is 9.8 N, it weight is

Cannot be calculated

1 N

9.8 N

4.9 N

185. Range of a projectile if R, when the angle of projection is 30°. Then, the value of the other angle of projection for the same range, is:

45°

60°

40°

50°

186. Which of the following is the smallest unit?

Millimeter

Fermi

Meter

Angstrom

187. The electrical forces are

Both A and B

Attractive

None

Repulsive

188. A man sitting in a bus traveling in a direction from west to east with a speed of 40 km/h observes that the rain-drops are falling vertically down. To the another man standing on ground the rain will appear

To fall vertically down

The information given is insufficient to decide the direction of rain.

To fall at an angle going from east to west

To fall at an angle going from west to east

189. The value of g on the moon whose diameter is ¼ that of earth is 1/6 of that of earth. The ratio of escape velocities at moon and earth’s surface is nearly:

1 : 1

2 : 5

5 : 1

1 : 5

190. The electrical forces between the molecules of a liquid are

None

Repulsive

Attractive

Both A and B

191. A car covers 1/3 distance with speed 20 km/hr and 2/3 with 60 km/h. Average speed is

50√2 km/h

80 km/h

40 km/h

36 km/h

192. A body falls freely from rest. It covers as much distance in the last second of its motion as covered in the first three seconds. The body has fallen for a time of

5 s

7 s

3 s

9 s

193. In case of streamed lined flow of liquid, the loss of energy is

Maximum

Minimum

Infinite

Zero

194. If momentum is increased by 20% then K.E. increases by

66%

55%

44%

77%

195. When the velocity of a liquid flowing steadily in a tube increases, its pressure?

Increases

Remains same

Zero

Decreases

196. Surface area is

Scalar

Vector

Both scalar and vector

Neither scalar nor vector

197. If the acceleration due to gravity at the earth’s surface is 9.8 m/s² and the mass of the earth is 90 times that of the moon and radius of earth 4 times that of moon, the value of G at the moon’s surface will be:

1.96 m/s²

None of these

4.9 m/s²

9.8 m/s²

198. Venturi relation is used measure

Density of the liquid

Height of the pipe

Pressure of the liquid

Speed of liquid flow

199. A person is standing on a rotating stool spreading his arms. He suddenly contracts his arms. His

Angular momentum increases

Moment of inertia decreases

Angular momentum decreases

Moment of inertia increases

200. If the spinning speed of the earth is increased, then the weight of the body at equator

Increases

Decreases

Does not change

Doubles

Page 9 of 11

201. The blood flow is ____________ flow at disystolic pressure.

Mixed

Turbulent

Laminar

None of these

202. If A x B = B x A, then the angle between A and B is

π

π/2

π/3

π/4

203. Maximum height of a bullet when fired at 30° with horizontal is 11 m. Then height when it is fired at 60° is

6 m

7.8 m

22 m

33 m

204. A body is subjected to a force such that its velocity is doubled, then

Its potential energy is also doubled

Its acceleration is also doubled

Its kinetic energy is also doubled

Its momentum is also doubled

205. If the K.E. of a body becomes four times of the initial value, then new momentum will

Remains constant

Become twice its initial value

Become three times, its initial value

Become four times, its initial value

206. At high altitude the blood oozes out of the nose and ear because

The percentage of oxygen in the air increase

The atmospheric pressure decreases there

The density of blood decreases at high altitudes

The blood pressure increase at high altitudes

207. The motion of planets in the solar system is an example of the conservation of:

Energy

Linear momentum

Mass

Angular momentum

208. According to Stoke’s law, drag force depends on

Final velocity

Initial velocity

Instantaneous velocity

Terminal velocity

209. The ability of a fluid to resist force is called

Stiffness

Strength

Ductility

Elasticity

210. Unite of impulse in

Newton

Joule

Kg m

Kg m/s

211. When a bicycle is in motion, the frictional forces exerted by the ground are:

In the backward direction on the front wheel and the forward direction on the rear wheel

In the forward direction on the rear wheel

In the backward direction on both the wheels

In the forward direction on both the wheels

212. The torque acting on a body is the rotational analogue of

Mass of the body

Linear kinetic energy of the body

Force in linear motion

Linear velocity of the body

213. In a uniform circular motion

Only velocity change, acceleration remain constant

Kinetic energy remain constant

Speed and acceleration change

Velocity and acceleration remain constant

214. Distance traveled by a body falling from rest in the first, second and third second is in the ratio of

1 : 4 : 9

1 : 2 : 3

None of these

1 : 3 : 5

215. A body of mass 1.0 kg is falling with an acceleration of 10 m/s². Its apparent weight will be (g = 10 m/s²)

0.5 kg wt

2.0 kg wt

1.0 kg wt

Zero

216. An airplane flies 400 m from north and then flies 300 m south and then flies 1200 m unwards then net displacement is

1500 m

1300 m

1200 m

1400 m

217. The density of water is 10³ kg/m³. The water pressure on a submarine is 2.0 x 10⁷ N/m². The depth of the submarine below the surface of the water, in meters is approximately

300 m

8000 m

11000 m

200 m

218. The rain drop falling from the sky reach the ground with

Variable speed

Constant terminal velocity

Constant acceleration (g)

Variable acceleration

219. The kinetic energy of a body becomes four ties its initial value. The new linear momentum will be

Same as the initial value

Thrice the initial value

Twice the initial value

Four times the initial value

220. Two equal forces (P each) act at a point inclined to each other at an angle of 120°. The magnitude of their resultant is

2P

P/2

P

P/4

221. A particle undergoes uniform circular motion. About which point on the plane of the circle, will the angular momentum of the particle remain conserved?

Center of the circle

Outside the circle

On the circumference of the circle

Inside the circle

222. For the same kinetic energy, the momentum is maximum for:

An electron

An α particle

A proton

A deuteron

223. What is true between center of gravity and center of mass?

They are always at the same point

None of these

Center of mass changes but center of gravity is always same

Center of gravity changes as one goes away from the earth but center of mass remains same

224. The work done in taking a particle from the floor to a table depends on

The time taken in this work

The height of the table

The actual path taken

The speed of the particle

225. The column of mercury is a mercury barometer is 76 cm high on a certain day when the barometer is vertical. If the barometer is tilted a few degrees, the vertical height of the mercury column, h, is

76 cm minus a function of the angle

Still 76 cm

76 cm plus the angle

76 cm minus the angle

Page 10 of 11

226. Rocket engines lift a rocket from the earth surface, because hot gas with high velocity

Push against the earth

Push against the air

Heat up the air which lifts the rocket

React against the rocket and push it up

227. The pressure will be low where the speed of the fluid is

Constant

High

Zero

Low

228. Two forces of magnitude 7 N and 5 N act on a particle at an angle θ to each other, θ can have any value. The minimum magnitude of the resultant force is

8 N

5 N

2 N

12 N

229. A thief stole a box with valuable article of weight W and jumped down a wall of height h. Before he reached ground he experienced a load of

Zero

2W

W/2

W

230. You are on a frictionless horizontal plane. How can you get off if no horizontal force is exerted by pushing against the surface?

By running on the plane

By rolling your body on the surface

By spitting or sneezing

By jumping

231. A tube is tapered from 20 cm diameter to 2 cm diameter, the velocity at the first cross-section is 50 cm/s, then the velocity at the second cross-section is

5 cm/s

50 cm/s

5 m/s

50 m/s

232. Coefficient of viscosity of honey is greater than

Milk

Petrol

Alcohol

Water

233. The low blood pressure is

78 – 809 torr

70 – 80 torr

75 – 80 torr

79 – 80 torr

234. If an iron ball and a wooden ball of the same radius was released from a height ‘h’ in vacuum, then time taken by both of them to reach ground will be

Roughly equal

Zero

Unequal

Exactly equal

235. If speed of electron is 5 x 10⁵ m/s. How long does it take one electron to traverse 1 m?

1 x 10⁵ s

1 x 10⁶ s

2 x 10⁵ s

2 x 10⁶ s

236. A flowing liquid possesses

P.E.

All

Pressure Energy

K.E.

237. Bernoulli’s equation is applicable for

Both laminar and turbulent flow

Laminar flow

None of these

Turbulent flow

238. Viscosity of ethanol at 30° C in Nsm¯²

1.012 x 10¯³

1.014 x 10¯³

1.000 x 10¯³

0.954 x 10¯³

239. Internal friction of fluid is called

Cohesive force

Resistance

Viscosity

Surface tension

240. According to equation of continuity A1V1 = A2V2 = constant. The constant is equal to

Mass of fluid

Flow rate

Density of fluid

Volume of fluid

241. The maximum drag force on a falling sphere is 9.8 N, it weight is

9.8 N

4.9 N

Cannot be calculated

1 N

242. When torque acting upon a system is zero which of the following will be constant?

Linear momentum

Linear impulse

None of these

Force

243. If L and R represent inductance and resistance respectively, then dimensional formula of L/R will be

ML⁰T⁰

M⁰L⁰T²

M⁰LT²

MLT⁰

244. Two bodies of mass 1 kg and 2 kg have equal momentum. Then, the ratio of their kinetic energies is

3 : 1

1 : 1

1 : 3

2 : 1

245. Three vectors satisfy the relation A . B and A . C = 0, then A is parallel to

C

B . C

B x C

B

246. Two bodies of masses 1 kg and 5 kg are dropped gently from the top of a tower. At a point 20 cm from the ground both the bodies will have the same

Velocity

Total energy

Kinetic energy

Momentum

247. The motion of planets in the solar system is an example of conservation of:

Angular momentum

Kinetic energy

Momentum

Mass

248. When two surfaces are coated with a lubricant, then they

Roll upon each other

Stick to each other

None of these

Slide upon each other

249. The low blood pressure is known as

Systolic

Diastolic

None of these

Low blood pressure

250. In deriving Bernoulli’s equation, it is assumed that the fluid is

In a steady state

All of these

Incompressible

Non-viscous

Page 11 of 11

251. The decrease in potential energy of a ball of mass 20 kg which falls from a height 50 cm is:

1980 J

968 J

98 J

None of these

252. Pressure exerted by a gas on the walls of its container is due to

Collision between the gas molecules and the container

Cohesion between the gas molecules and the container

Surface tension of the gas

Adhesion between the gas molecules and the container

253. A ball is dropped vertically down and it takes time t to reach the ground. At time t/2:

The ball had covered more than half the distance

The velocity of the ball was V/3 where V is the velocity when it reached the ground

The ball had covered exactly half the distance

The ball had covered less than half the distance

254. Numerical value of magnitude of a physical quantity is

Independent of system of units

Directly proportional to magnitude of the unit

Either (B) or (C)

Inversely proportional to magnitude of the unit

255. Two forces P and Q have a resultant perpendicular to P. The angle between the forces is:

sin¯¹(P/Q)

cos¯¹(-P/Q)

tan¯¹(-P/Q)

tan¯¹(P/Q)

256. V = √2g(h₁ – h₂) shows the

Bernoulli’s theorem

None of these

Torricelli’s theorem

Equation of continuity

257. In equation of continuity, if the fluid is incompressible and the flow is steady, the mass of the fluid is

None of these

Somewhat conserved

Not conserved

Conserved

258. Which of the following is not the unit of energy?

Electron-volt

Joule

Calorie

Watt

259. When a body is moving on a surface, the force of friction is called

Static friction

Dynamic friction

Rolling friction

Limiting friction

260. An aircraft is moving with a velocity of 300 ms¯¹. If all the forces acting on it are balanced, then

It will lose its velocity gradually

It will be just floating at the same point in space

It will be fall down instantaneously

It still moves with the same velocity

261. A cold soft drink is kept on the balance. When the cap is opened, then the weight

Increases

First increases, then decreases

Decreases

Remains same

262. If the water falls from a dam into a turbine wheel 19.6 m below, then the velocity of water at the turbine, is (Take g = 9.8 m/s²)

39.2 m/s

98.0 m/s

9.8 m/s

19.6 m/s

263. Fire fighters have a jet attached to the head of their water pipes in order to

Increase the mass of water flowing per second

Increase the velocity of water flowing out

Increase the volume of water flowing per second

Avoid wastage of water

264. The resultant of two forces, one double the other in magnitude, is perpendicular to the smaller of the two forces. The angle between the two forces is

60°

120°

150°

90°

265. A person walks first 10 km north and 20 km east, then the resultant vector is

20 36 km

25.23 km

22.46 km

22.36 km

266. In a container having water filled up to a height h, a hole is made in the bottom. The velocity of water flowing out of the hole is

Proportional to h²

Proportional to h

Proportional to h¹⁄ ²

Independent of h

267. A flowing liquid possesses

Pressure Energy

K.E.

P.E.

All

268. The flow is said to be streamline or laminar when every particle

Slowly moves in one direction

None of these

Moves in different direction

Moves along the same path as

269. A particle is moving in a vertical circle. The tensions the string when passing through two positions at angles 30° and 60° from vertical (lowest positions) are T₁ and T₂ respectively. Then

Tension in the string always remains the same

T₁ > T₂

T₂ > T₁

T₁ = T₂

Total Questions:	269
Time Allowed:	120 Minutes
Total Marks:	269
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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