ECAT Physics Fluid Dynamics Chapter Online Test

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Physics

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

P/2

P/4

2P

P

2. 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

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

Constant terminal velocity

Variable speed

Constant acceleration (g)

Variable acceleration

4. 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

5. 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?

500 gf

400 gf

300 gf

700 gf

6. Blood has a density

Lesser then water

Greater then water

Equal to water

None of these

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

Angular momentum increases

Moment of inertia increases

Moment of inertia decreases

Angular momentum decreases

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

None of these

Both

Change

Constant

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

Equal to what is in turbulent flow

Minimum

Maximum

Infinite

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

Angular momentum

Linear momentum

Work

Energy

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

None of these

Increase

Decreases

Zero

12. 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

7,200 N

3,600 N

10,000 N

100,000 N

13. Venturi relation is used measure

Speed of liquid flow

Density of the liquid

Pressure of the liquid

Height of the pipe

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

36 km/h

40 km/h

50√2 km/h

80 km/h

15. 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 the front wheel and in the forward direction on the rear wheel

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

In the forward direction on bath the wheels

In the backward direction on both the wheels

16. Angular momentum has the same unit as

Linear momentum x time

Work x frequency

Power x time

Impulse x distance

17. V = √2g(h₁ – h₂) shows the

Torricelli’s theorem

Equation of continuity

None of these

Bernoulli’s theorem

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

1200 m

1500 m

1400 m

1300 m

19. The electrical forces are

Attractive

None

Repulsive

Both A and B

20. 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

Zero

Exactly equal

Roughly equal

Unequal

21. The Bernoulli’s equation is based on the

Law of conservation of mass

Law of conservation of energy

All of these

Law of conservation of momentum

22. 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

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

8 m/s²

16 m/s²

16 radian/s²

8 radian/s²

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

Unsteady

B and C

Steady

Irregular

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

Fv

Fv²

v/F

F/v

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

Energy

Momentum

Fluid

Mass

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

3 J

2 J

1 J

4 J

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

33 m

7.8 m

6 m

22 m

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

Decrease for both

Decrease for liquids and increase for gases

Increases for both

Increase for liquids and decreases for gases

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

10 ms¯²

1 ms¯²

2 ms¯²

20 ms¯²

31. Swimming is based on the principle of

Newton’s 2nd law

All

Newton’s 3rd law

Newton’s 1st law

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

Spherical

Rough

Square

Circular

33. Substance which flows easily are

All of these

Petrol

Water

Kerosene oil

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

0.064 m

64 m

64 cm

640 cm

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

Constant terminal velocity

Variable acceleration

Variable speed

Constant acceleration (g)

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

Momentum change is mvr

Change in KE is ½ mv²

Change in KE is zero

Change in KE is mv²

37. Which of the following quantities is a vector

Density

Displacement

Volume

Temperature

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

Increase the mass of water flowing per second

Avoid wastage of water

Increase the velocity of water flowing out

Increase the volume of water flowing per second

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

Mg

0

M(g – a)

M(g + a)

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

Power

Energy

Momentum

Angular momentum

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

Rolling friction

Limiting friction

Static friction

Dynamic friction

42. 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

E/2

Zero

F/√2

E

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

Four times the initial value

Twice the initial value

Thrice the initial value

Same as the initial value

44. The rectangular components of force 5 dyne are

2 and 3 dyne

3 and 4 dyne

2.5 and 25 dyne

1 and 2 dyne

45. 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

0.98 m

0.2 m

0.1 m

46. 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

Pt/2m

P²t²/3m

P²t²/2m

P²t²/m

47. 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?

0.01 m/s

10 m/s

0.1 m/s

1 m/s

48. Which of the following is true?

Both momentum and kinetic energy are conserved in all collisions

Momentum is conserved in all collisions but not kinetic energy

Neither momentum nor kinetic energy is conserved in inelastic collisions

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

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

1 and 2

2 and 3

3 and 4

4 and 5

50. 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 range will be same

Their landing velocity will be same

Their maximum height will be same

Their time of flight will be same

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51. 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

1 x 10² cm³

2 x 10² cm³

None of these

52. Force of friction is present in

All of these

Gases

Liquid

Solid

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

The blood pressure increase at high altitudes

The percentage of oxygen in the air increase

The atmospheric pressure decreases there

The density of blood decreases at high altitudes

54. 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.

120°

90°

60°

None of these

55. 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

2gh

√gh

√2gh

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

4 times

Double

Half

¼ times

57. 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

50 cm/s

5 cm/s

5 m/s

50 m/s

58. Dot product of two mutual perpendicular vector is:

0

None of these

∞

1

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

Adhesion between the gas molecules and the container

Collision between the gas molecules and the container

Surface tension of the gas

Cohesion between the gas molecules and the container

60. 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 kinetic energy is constant

Its velocity is constant

Its acceleration is constant

Its moves in straight line

61. The blood vessels are inflated even in

None of these

Relaxed states between heart beat

Working state between heart beat

Occasionally

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

1.000 x 10¯³

1.014 x 10¯³

1.012 x 10¯³

0.954 x 10¯³

63. 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

Go on decreasing

Remains the same

First increase and then decrease

Go no increasing

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

Mass and angular velocity

Centripetal force and radius

Moment of inertia and angular velocity

Linear velocity and angular velocity

65. A jet engine works on the principle of

Conservation of energy

Conservation of mass

Conservation of linear momentum

Conservation of angular momentum

66. Coefficient of viscosity of honey is greater than

Alcohol

Petrol

Water

Milk

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

M⁰LT²

M⁰L⁰T²

ML⁰T⁰

MLT⁰

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

1 : 4 : 9

1 : 3 : 5

None of these

1 : 2 : 3

69. The high blood pressure is

110 torr

100 torr

130 torr

120 torr

70. In a uniform circular motion

Velocity and acceleration remain constant

Kinetic energy remain constant

Speed and acceleration change

Only velocity change, acceleration remain constant

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

The atmospheric pressure decreases there

The percentage of oxygen in the air increase

The density of blood decreases at high altitudes

The blood pressure increase at high altitudes

72. At terminal velocity, fluid friction is

None of these

Zero

Minimum

Maximum

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

2 x 10⁵ s

1 x 10⁶ s

1 x 10⁵ s

2 x 10⁶ s

74. 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

75. The term Brownian movement refers to

The stretching of a body beyond its elastic limit

Irregular motions of small particles suspended in a fluid

Convection currents in a gas but not in a liquid

Convection currents in a liquid or gas

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76. A flowing liquid possesses

Pressure Energy

P.E.

All

K.E.

77. When fluid is incompressible then

Velocity of the fluid is constant

Density of the fluid is constant

Volume of the fluid is constant

Flow of the fluid is straight line

78. The unit of focal power of a lens is

Horse power

Watt

Kilo watt

Diopter

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

968 J

None of these

1980 J

98 J

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

400 m

300 m

100 m

200 m

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

Momentum decreases

Momentum increases

Kinetic energy decreases

Kinetic energy increases

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

(3/2)R

R

2R

4R

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

Diameter of the body

Square of the diameter of the body

Size of the body

Radius of the body

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

Remains same

Zero

Increases

Decreases

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

Push against the air

React against the rocket and push it up

Push against the earth

Heat up the air which lifts the rocket

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

6.18 x 10¯³

6.29 x 10¯³

6.12 x 10¯³

6.49 x 10¯³

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

0.20 m/s²

0.027 m/s²

0.03 m/s²

0.218 m/s²

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

Moving fast

Moving slowly

Moving

Stationary

89. The atmosphere is held to the earth by

The rotation of earth

Gravity

Winds

Clouds

90. With the increase of temperature viscosity

Increase

Decrease

Doubles

Remains same

91. 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

v/A = constant

None

Av = constant

92. 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:

40°

50°

60°

45°

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

Strength

Ductility

Elasticity

Stiffness

94. Which of the following quantity is dimensionless?

Power of lens and gas constant

None of these

Plank’s constant

Gravitational constant

95. Angular momentum is

Neither A. nor B.

A scalar

Either A. or B.

A vector

96. 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 plus the angle

Still 76 cm

76 cm minus a function of the angle

76 cm minus the angle

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

Angular momentum

Momentum

Kinetic energy

Mass

98. Unite of impulse in

Kg m

Joule

Kg m/s

Newton

99. An instrument called a sphygmomanometer measure

Blood pressure

Milk density

None of these

Density of water

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

Unity or less

Less than unity

Unity or more

Unity

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

0.564 x 10¯³

0.594 x 10¯³

0.521 x 10¯³

0.599 x 10¯³

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

3

4

1

2

103. 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

11000 m

200 m

8000 m

300 m

104. Surface area is

Scalar

Both scalar and vector

Vector

Neither scalar nor vector

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

Attractive

Both A and B

Repulsive

None

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

Force, impulse

Pressure, stress

Velocity, speed

Work, energy

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

Remains same

Increases

Decreases

First increases, then decreases

108. 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

Av = constant

v/A = constant

A/v = constant

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

When a net eternal torque is acting upon the system

When a net external impulse is acting upon the system

When net external force is acting upon the system

None of these

110. 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

It moves in a circular path

None of these

111. 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

2.5 x 10¯³ Ns

1.5 x 10¯³ Ns

0.98 x 10¯³ Ns

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

Law of conservation of energy

Law of conservation of momentum

Law of conservation of mass

All of these

113. 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

Total energy

Velocity

Momentum

Kinetic energy

114. 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

Pressure between the narrow gap decreases

None

115. Length cannot be measured by

Debye

Micron

Light year

Fermi

116. 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%

10%

9%

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

Depends on their mass

Both will reach simultaneously

The faster one

The slower one

118. Wb/m² is equal to

Watt

Dynes

Henry

Tesla

119. Which of the following is the smallest unit?

Meter

Fermi

Millimeter

Angstrom

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

Energy and Young’s modulus

Torque and work

Light year and time

Angular momentum and work

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

None of these

Velocity

Force

Acceleration

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

B . C

B

B x C

C

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

Variable acceleration

Constant retardation

Variable speed and constant velocity

Constant acceleration

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

(1/R)²

R

1/R

R²

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

4.9 N

9.8 N

1 N

Cannot be calculated

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126. Which of these statements is not correct?

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

None of these

Moment of inertia does not depend on mass of body

Moment of inertia depends on choice of axes

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

None of these

Decreases

Increases

Remains unchanged

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

Infinite

Maximum

Zero

Minimum

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

Friction due to tyres

The drive of the car

Force of brakes

Force by steering wheel

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

Energy

Momentum

None

Mass

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

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

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

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

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

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

None of these

Moves along the same path as

Moves in different direction

Slowly moves in one direction

133. The Systolic blood pressure comes when

Cutting off the blood flow

Vessel collapse

All of these

None of these

134. Reason of weightlessness in a satellite is

Zero gravity

Center of mass

None of these

Zero reaction force by satellite surface

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

Linear momentum

Angular momentum

Mass

Energy

136. Surface tension of water is reduced by adding

Camphor

Both A and B

Detergents

Plastic

137. Bernoulli’s equation is applicable for

Both laminar and turbulent flow

Laminar flow

Turbulent flow

None of these

138. 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

None

8 cm

1 cm

2 cm

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

All

Ideal fluid

Prefect fluid

Non-ideal fluid

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

All

Mass

Energy

Momentum

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

Linear velocity of the body

Force in linear motion

Mass of the body

Linear kinetic energy of the body

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

9.8 N

Cannot be calculated

1 N

4.9 N

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

1 cm/s

1 mm/s

1 μm/s

1 nm/s

144. 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?

2 m/s

8 m/s

1 m/s

4 m/s

145. 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

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

4 : 1

1 : 2

1 : 1

1 : 4

147. 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

To fall at an angle going from east to west

To fall at an angle going from west to east

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

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

1 : 1

3 : 1

1 : 3

2 : 1

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

Venturi relation

None of these

Bernoulli’s equation

Torricelli’s theorem

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

0.198 x 10¯³

0.301 x 10¯³

0.224 x 10¯³

0.295 x 10¯³

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151. 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

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

Axis of rotation

Mass distribution

Angular velocity

Mass of object

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

None of these

Both will cover equal distance

Car will cover less distance before rest

Truck will cover less distance before rest

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

Final velocity

Instantaneous velocity

Initial velocity

Terminal velocity

155. The low blood pressure is

70 – 80 torr

78 – 809 torr

75 – 80 torr

79 – 80 torr

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

15 N

60 N

30 N

21 N

157. 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

90°

120°

60°

150°

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

Non-viscous

All of these

In a steady state

Incompressible

159. 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

2W

W

W/2

Zero

160. 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

T₂ > T₁

Tension in the string always remains the same

T₁ = T₂

T₁ > T₂

161. 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

42 km/h

37.5 km/h

10 km/h

40 km/h

162. Identify the pair whose dimensions are equal

Torque and work

Force and stress

Stress and energy

Force and work

163. The blood pressure of the person

None

Remains the same

Increases with age

Decreases with age

164. 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

72000

129600

360000

36000

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

They are always at the same point

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

Center of mass changes but center of gravity is always same

None of these

166. 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

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

A bullet striking a bag of sand

A man jumping onto a moving cart

An electron captured by a proton

Striking of two glass balls

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

Zero

Decreases

Increases

Remains same

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

Doubles

Increases

Decreases

Does not change

170. A flowing liquid possesses

All

P.E.

Pressure Energy

K.E.

171. Pick out the wrong pair:

Pressure-barometer

Temperature-thermometer

Charge-coulomb

Sp. gravity-hygrometer

172. 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

¼ times

Twice

4 times

½ of 4 cm diameter pipe

173. 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

174. 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?

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

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

175. 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 = 4t₂

t₁ = t₂

t₁ = t₂/2

t₁ = t₂/4

Page 8 of 11

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

Force

None of these

Linear momentum

Linear impulse

177. A chimney works best when it is

Tall

A and B

Exposed to air currents

Not tall but wide

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

Thrice

Once

Four times

Twice

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

Increases

Decreases rapidly

None of these

Decreases

180. Drag force is given by

Pascal’s law

Gauss law

Newton’s law

Stokes law

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

The momentum changes by mv

The kinetic energy changes by (1/2)mv²

The kinetic energy changes by mv²

The momentum changes by 2mv

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

Mobile oil

Thick tar

Honey

All of these

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

Low

Constant

Zero

High

184. 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)

19.6 m/s

9.8 m/s

39.2 m/s

98.0 m/s

185. The low blood pressure is known as

Low blood pressure

Systolic

Diastolic

None of these

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

By rolling your body on the surface

By spitting or sneezing

By running on the plane

By jumping

187. 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:

5 : 1

1 : 5

1 : 1

2 : 5

188. The mass of the block is

None of these

21,000 g

30001 b

3000 g

189. 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

2.3

3.0

1.3

1.5

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

Turbulent

Laminar

Mixed

None of these

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

More than 4 dynes

Between 1 and 7 dyne

Between 3 and 4 dyne

More than 3 dynes

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

Small

None of these

Large

Very large

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

It will be fall down instantaneously

It will lose its velocity gradually

It will be just floating at the same point in space

It still moves with the same velocity

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

4 times

Half

Double

¼ time

195. 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

5.5 km/s

22 km/s

11 km/s

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

Become four times, its initial value

Remains constant

Become three times, its initial value

Become twice its initial value

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

66%

55%

77%

44%

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

In the forward direction on the rear wheel

In the backward direction on both the wheels

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

In the forward direction on both the wheels

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

Momentum

Mass

Kinetic energy

Speed

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

Instantaneous velocity

Initial velocity

Final velocity

Terminal velocity

Page 9 of 11

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

Away from the train

On himself

On the train

Towards the train

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

Turbulent flow

Laminar flow

None of these

Both a and b

203. 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 smaller than molecules in the air

Water contains hydrogen atoms, air does not

Water molecules are larger than molecules in the air

Surface tension of the water prevents it from

204. Internal friction of fluid is called

Cohesive force

Surface tension

Resistance

Viscosity

205. 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

9.8 m/s²

4.9 m/s²

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

tan¯¹(P/Q)

sin¯¹(P/Q)

cos¯¹(-P/Q)

tan¯¹(-P/Q)

207. Ball pen functions on the principle of

Boyle’s law

Surface tension

Viscosity

Gravitational force

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

None of these

Action of gravity

(h₁ – h₂) and falling under gravity

h₁ – h₂

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

Become zero

Decrease

Increase

Remain unchanged

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

Less than the weight of liquid displaced

Weight of body-weight of liquid displaced

Equal to weight of liquid displaced

Zero

211. Numerical value of magnitude of a physical quantity is

Directly proportional to magnitude of the unit

Either (B) or (C)

Inversely proportional to magnitude of the unit

Independent of system of units

212. The angular momentum of a body is conserved if

Torque acting on it is constant

Torque acting on it is zero

Force acting on it is constant

Force acting on it is zero

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

Joule

Watt

Electron-volt

Calorie

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

Solar constant

Compressibility

Density

Surface tension

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

Acceleration

Centripetal force

Velocity

Kinetic energy

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

None of these

1 m/s

2 m/s

4 m/s

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

π

π/3

π/4

π/2

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

Tangential

Centrifugal

Radial

Centripetal

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

Density

Weight in air

Weight in water

Weight in the liquid

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

Its acceleration is also doubled

Its kinetic energy is also doubled

Its momentum is also doubled

Its potential energy is also doubled

221. At high speeds the force is no longer

Simply proportional

No proportion

None of these

Proportional

222. 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

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

An electron

A proton

An α particle

A deuteron

224. 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?

20 m

9.8 m

50 m

25 m

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

Both a and b

Mass flux

Magnetic flux

Electric flux

Page 10 of 11

226. 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

7 s

9 s

3 s

5 s

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

None of these

Conserved

Somewhat conserved

Not conserved

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

Zero

High

Low

Constant

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

8 times

6 times

4 times

2 times

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

Surface tension effect

Viscous force exerted by air

Air currents of the earth atmosphere

Up thrust of air

231. S.I unit of magnetic flux is

Weber per metre

Weber metre¯²

Weber per metre⁴

Weber

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

There is no net force

There is no displacement

The force is always away from the center

Force and displacement are perpendicular to each other

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

Bernoulli’s equation

Magnus effect

Equation of continuity

Surface energy

234. Velocity of fluid increases where the pressure is

Changes continuously

Constant

Low

High

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

Are equal to each other in magnitude

Cannot be predicted

Are not equal to each other in magnitude

Are equal to each other

236. Stoke’s law is applicable to

Motion through non-resistive medium

Motion through free space

Motion through horizontal surface

Motion through viscous medium

237. 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

5 J

100 J

350 J

3430 J

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

120°

60°

90°

0°

239. 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 h

Proportional to h¹⁄ ²

Independent of h

Proportional to h²

240. 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)

14.7 m

4.9 m

19.6 m

9.8 m

241. 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 cylinder

Solid sphere

Equal both

242. 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

2 N

5 N

8 N

12 N

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

On the circumference of the circle

Center of the circle

Inside the circle

Outside the circle

244. 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

200

2000

20

20,000

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

3 x 10¯¹⁰ J

4.5 x 10¯¹⁰ J

3 x 10¯¹⁹ J

4.5 x 10¯¹⁹ J

246. 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

4.4 joule

3.2 joule

3.8 joule

2.8 joule

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

Mass of fluid

Density of fluid

Flow rate

Volume of fluid

248. The unit of inductance is equivalent to

Volt/ampere x second

Volt x second/ampere

Ampere/volt x second

Volt x ampere/second

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

Mg

Mg/2

More than mg

More than 2mg

250. 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

0 N

4 N

8 N

Page 11 of 11

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

Is greater than that of B

Is zero

Is smaller than that of B

Is equal to that of B

252. Angular momentum is

Axial vector

At 45° angle

Scalar

Polar vector

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

Slide upon each other

Roll upon each other

Stick to each other

None of these

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

Initially turbulent

All of these

Sound heard

High flow speed

255. 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

0.05 N

0.5 N

N

Zero

256. 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

2gh

√2gh

√gh

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

Remains same

First A and Then B

Decreases

Increases

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

No acceleration

Linear acceleration

Angular acceleration

None of these

259. The concentration of red blood cells in blood is

~ 50%

~ 30%

– 45%

– 40%

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

The height of the table

The actual path taken

The time taken in this work

The speed of the particle

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

22.46 km

22.36 km

20 36 km

25.23 km

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

The ball had covered exactly half the distance

The ball had covered less than half the distance

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

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

Parallel to each other

Perpendicular to each other

Antiparallel to each other

Inclined to each other at an angle of 45°

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

Variable

Maximum

Infinite

Zero

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

Zero

2 Mg

½ Mg

Mg

266. 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 = 30°

None of these

θ = 60°

θ = 90°

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

The acceleration of the object is zero

The object is moving at constant speed

The object can be at rest

The object must be at rest

268. 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

33 m/s

None of these

17 m/s

17.5 m/s

269. The direction of the angular velocity vector is along

The axis of rotation

The outward radius

The tangent to the circular path

The inward radius

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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