ECAT Physics Fluid Dynamics Chapter Online Test

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Physics

1. Ball pen functions on the principle of

Gravitational force

Viscosity

Surface tension

Boyle’s law

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

Momentum

Energy

Angular momentum

Power

3. 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

0.98 m

0.2 m

0.1 m

Full length of the capillary tube

4. 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

None of these

When net external force is acting upon the system

5. 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

T₁ > T₂

T₁ = T₂

Tension in the string always remains the same

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

Mass of the body

Force in linear motion

Linear kinetic energy of the body

Linear velocity of the body

7. 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/4

P

2P

P/2

8. The Systolic blood pressure comes when

Cutting off the blood flow

Vessel collapse

None of these

All of these

9. Bernoulli’s equation is applicable for

Both laminar and turbulent flow

None of these

Turbulent flow

Laminar flow

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

1 : 1

1 : 3

2 : 1

3 : 1

11. 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

12. Substance which flows easily are

Water

Kerosene oil

Petrol

All of these

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

Linear momentum

Mass

Energy

Angular momentum

14. 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

25 m

50 m

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

7.8 m

22 m

33 m

6 m

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

Square

Spherical

Circular

Rough

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

F/v

Fv

v/F

Fv²

18. 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:

9.8 m/s²

1.96 m/s²

4.9 m/s²

None of these

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

Is zero

Is smaller than that of B

Is equal to that of B

Is greater than that of B

20. 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 = 60°

θ = 90°

θ = 30°

None of these

21. 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

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

None of these

Both a and b

Laminar flow

Turbulent flow

23. 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)

19.6 m

9.8 m

4.9 m

14.7 m

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

An electron captured by a proton

A man jumping onto a moving cart

A bullet striking a bag of sand

Striking of two glass balls

25. 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

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26. Stoke’s law is applicable to

Motion through non-resistive medium

Motion through free space

Motion through viscous medium

Motion through horizontal surface

27. Which of these statements is not correct?

None of these

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

Moment of inertia does not depend on mass of body

Moment of inertia depends on choice of axes

28. 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

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

E/2

Zero

E

F/√2

30. Dot product of two mutual perpendicular vector is:

0

None of these

∞

1

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

Electric flux

Magnetic flux

Mass flux

Both a and b

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

Both A and B

Attractive

None

Repulsive

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

Static friction

Dynamic friction

Limiting friction

Rolling friction

34. When fluid is incompressible then

Volume of the fluid is constant

Density of the fluid is constant

Flow of the fluid is straight line

Velocity of the fluid is constant

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

Magnus effect

Bernoulli’s equation

Equation of continuity

Surface energy

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

Variable speed and constant velocity

Variable acceleration

Constant retardation

Constant acceleration

37. 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?

8 m/s

2 m/s

1 m/s

4 m/s

38. At high speeds the force is no longer

No proportion

Proportional

None of these

Simply proportional

39. The atmosphere is held to the earth by

Clouds

Winds

The rotation of earth

Gravity

40. 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

3,600 N

100,000 N

7,200 N

41. Identify the pair whose dimensions are equal

Stress and energy

Force and stress

Force and work

Torque and work

42. 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 the front wheel and the forward direction on the rear wheel

In the backward direction on both the wheels

In the forward direction on both the wheels

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?

0.01 m/s

0.1 m/s

10 m/s

1 m/s

44. At terminal velocity, fluid friction is

Minimum

None of these

Zero

Maximum

45. 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

150°

120°

60°

90°

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

Centripetal force

Gravitational force

All of these

Centrifugal force

47. 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 at an angle going from west to east

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

To fall vertically down

To fall at an angle going from east to west

48. 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.

60°

120°

90°

None of these

49. 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

360000

36000

72000

129600

50. The blood vessels are inflated even in

Working state between heart beat

Occasionally

None of these

Relaxed states between heart beat

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

An α particle

A proton

An electron

A deuteron

52. 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

Unequal

Roughly equal

Zero

Exactly equal

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

Final velocity

Terminal velocity

Instantaneous velocity

Initial velocity

54. 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

None of these

Angular acceleration

Linear acceleration

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

0.301 x 10¯³

0.198 x 10¯³

0.295 x 10¯³

0.224 x 10¯³

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

None of these

Moves along the same path as

Slowly moves in one direction

Moves in different direction

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

None

Momentum

Mass

Energy

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

0.954 x 10¯³

1.012 x 10¯³

1.000 x 10¯³

1.014 x 10¯³

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

Electron-volt

Joule

Watt

Calorie

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

Its momentum is also doubled

Its acceleration is also doubled

Its kinetic energy is also doubled

Its potential energy is also doubled

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

Av = constant

A/v = constant

None of these

v/A = constant

62. 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

14

16

13

63. The high blood pressure is

110 torr

120 torr

100 torr

130 torr

64. 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

More than 3 dynes

Between 3 and 4 dyne

65. Drag force is given by

Pascal’s law

Gauss law

Stokes law

Newton’s law

66. The blood pressure of the person

Increases with age

None

Decreases with age

Remains the same

67. 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

68. Swimming is based on the principle of

Newton’s 3rd law

Newton’s 1st law

Newton’s 2nd law

All

69. The concentration of red blood cells in blood is

~ 30%

~ 50%

– 40%

– 45%

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

Remain unchanged

Increase

Become zero

Decrease

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

Linear momentum

Work

Energy

Angular momentum

72. 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

50 m/s

5 m/s

5 cm/s

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

Sound heard

All of these

Initially turbulent

High flow speed

74. Length cannot be measured by

Debye

Micron

Fermi

Light year

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

Half

¼ time

Double

4 times

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

Irregular

B and C

Steady

Unsteady

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

None of these

Increase

Decreases

Zero

78. 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

79. 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 x 10² cm³

None of these

2 x 10² cm³

1.763 x 10² cm³

80. 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

Independent of h

Proportional to h

Proportional to h¹⁄ ²

Proportional to h²

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

(3/2)R

2R

4R

R

82. Pick out the wrong pair:

Temperature-thermometer

Sp. gravity-hygrometer

Charge-coulomb

Pressure-barometer

83. The unit of focal power of a lens is

Watt

Kilo watt

Diopter

Horse power

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

44%

77%

66%

55%

85. The term Brownian movement refers to

Convection currents in a gas but not in a liquid

Irregular motions of small particles suspended in a fluid

Convection currents in a liquid or gas

The stretching of a body beyond its elastic limit

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

Up thrust of air

Surface tension effect

Air currents of the earth atmosphere

Viscous force exerted by air

87. 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 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

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

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

Flow rate

Mass of fluid

Volume of fluid

Density of fluid

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

Friction due to tyres

Force by steering wheel

Force of brakes

The drive of the car

90. 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 – 5 N, F₃ = 1 N

F₁ – 3 N, F₂ – 5N, F₃ = 15 N

F₁ – 3 N, F₂ – 5N, F₃ = 6 N

91. 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

92. A flowing liquid possesses

K.E.

All

P.E.

Pressure Energy

93. 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

2 cm

None

8 cm

1 cm

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

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

The ball had covered less than half the distance

The ball had covered more than half the distance

The ball had covered exactly half the distance

95. 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

1.5

2.3

3.0

1.3

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

9.8 N

1 N

4.9 N

Cannot be calculated

97. 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

39.2 m/s

9.8 m/s

98.0 m/s

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

Zero

Low

Constant

High

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

120°

90°

0°

60°

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

Zero

Remains same

Increases

Decreases

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

4 J

2 J

3 J

1 J

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

π

π/4

π/3

π/2

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

The horse on the cart

The ground on the cart

The horse on the ground

The ground on the horse

104. Numerical value of magnitude of a physical quantity is

Inversely proportional to magnitude of the unit

Independent of system of units

Directly proportional to magnitude of the unit

Either (B) or (C)

105. 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

Zero

W/2

W

106. 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

107. Angular momentum has the same unit as

Linear momentum x time

Impulse x distance

Work x frequency

Power x time

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

All

Prefect fluid

Non-ideal fluid

Ideal fluid

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

Density

Surface tension

Compressibility

Solar constant

110. Coefficient of viscosity of honey is greater than

Alcohol

Milk

Water

Petrol

111. The electrical forces are

Both A and B

None

Repulsive

Attractive

112. The low blood pressure is

70 – 80 torr

79 – 80 torr

75 – 80 torr

78 – 809 torr

113. 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

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

Collision between the gas molecules and the container

Surface tension of the gas

Adhesion between the gas molecules and the container

Cohesion between the gas molecules and the container

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

Variable

Zero

Maximum

Infinite

116. 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

1400 m

1500 m

1300 m

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

Once

Thrice

Four times

Twice

118. 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 radian/s²

16 m/s²

16 radian/s²

8 m/s²

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

Pressure, stress

Work, energy

Force, impulse

Velocity, speed

120. 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

2 x 10⁶ s

1 x 10⁶ s

1 x 10⁵ s

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

In a steady state

Non-viscous

All of these

Incompressible

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

1 ms¯²

10 ms¯²

2 ms¯²

20 ms¯²

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

Increases

First A and Then B

Decreases

Remains same

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

tan¯¹(-P/Q)

cos¯¹(-P/Q)

tan¯¹(P/Q)

sin¯¹(P/Q)

125. 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:

22 km/s

16.5 km/s

11 km/s

5.5 km/s

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

4.5 x 10¯¹⁹ J

4.5 x 10¯¹⁰ J

3 x 10¯¹⁹ J

3 x 10¯¹⁰ J

127. The angular momentum of a body is conserved if

Torque acting on it is constant

Force acting on it is zero

Force acting on it is constant

Torque acting on it is zero

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

60 N

30 N

15 N

21 N

129. 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

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

Away from the train

On himself

On the train

Towards the train

131. 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¯¹ 5/13

cos¯¹ 7/13

cos¯¹ 5/12

cos¯¹12/13

132. 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 time of flight will be same

Their landing velocity will be same

Their maximum height will be same

133. The mass of the block is

30001 b

3000 g

None of these

21,000 g

134. 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

Zero

0.05 N

N

0.5 N

135. An instrument called a sphygmomanometer measure

Density of water

None of these

Milk density

Blood pressure

136. A flowing liquid possesses

All

P.E.

Pressure Energy

K.E.

137. 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

Equal to weight of liquid displaced

Zero

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

Kinetic energy

Velocity

Acceleration

Centripetal force

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

Torricelli’s theorem

Bernoulli’s equation

None of these

Venturi relation

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

Become twice its initial value

Become three times, its initial value

Remains constant

Become four times, its initial value

141. The Bernoulli’s equation is based on the

Law of conservation of mass

Law of conservation of momentum

All of these

Law of conservation of energy

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

40 km/h

80 km/h

36 km/h

50√2 km/h

143. 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

2000

20,000

200

20

144. 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 still moves with the same velocity

It will be fall down instantaneously

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

Axis of rotation

Mass distribution

Angular velocity

Mass of object

146. 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

None

Av = constant

v/A = constant

147. Which of the following quantities is a vector

Temperature

Density

Displacement

Volume

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

None of these

Remains unchanged

Increases

Decreases

149. The direction of the angular velocity vector is along

The tangent to the circular path

The axis of rotation

The inward radius

The outward radius

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

Increase the velocity of water flowing out

Increase the mass of water flowing per second

Increase the volume of water flowing per second

Avoid wastage of water

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151. 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°

40°

60°

50°

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

Mass

All

Energy

Momentum

153. S.I unit of magnetic flux is

Weber

Weber per metre

Weber metre¯²

Weber per metre⁴

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

Mg

½ Mg

2 Mg

Zero

155. 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

156. 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

t₁ = 4t₂

t₁ = t₂/2

157. Force of friction is present in

All of these

Gases

Solid

Liquid

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

0.599 x 10¯³

0.521 x 10¯³

0.594 x 10¯³

0.564 x 10¯³

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

None of these

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

They are always at the same point

160. Angular momentum is

Polar vector

Axial vector

At 45° angle

Scalar

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

Torque and work

Angular momentum and work

Light year and time

Energy and Young’s modulus

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

Small

None of these

Large

Very large

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

Change in KE is ½ mv²

Change in KE is mv²

Momentum change is mvr

Change in KE is zero

164. 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

165. In a uniform circular motion

Speed and acceleration change

Only velocity change, acceleration remain constant

Kinetic energy remain constant

Velocity and acceleration remain constant

166. Which of the following is true?

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

Both momentum and kinetic energy are conserved in all collisions

Momentum is conserved in all collisions but not kinetic energy

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

6.12 x 10¯³

6.18 x 10¯³

6.49 x 10¯³

6.29 x 10¯³

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

High

Constant

Low

Zero

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

Light object

Both have the same momentum

Heavy object

Data is not sufficient

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

Law of conservation of momentum

Law of conservation of mass

Law of conservation of energy

All of these

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

¼ times

4 times

Half

Double

172. 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

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

The speed of the particle

The height of the table

The actual path taken

The time taken in this work

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

640 cm

0.064 m

64 cm

64 m

175. Reason of weightlessness in a satellite is

Zero gravity

None of these

Center of mass

Zero reaction force by satellite surface

Page 8 of 11

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

1 : 3 : 5

None of these

1 : 4 : 9

1 : 2 : 3

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

Decrease for both

Increases for both

Decrease for liquids and increase for gases

Increase for liquids and decreases for gases

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

Moment of inertia decreases

Angular momentum increases

Angular momentum decreases

Moment of inertia increases

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

300 m

100 m

400 m

200 m

180. Venturi relation is used measure

Pressure of the liquid

Height of the pipe

Density of the liquid

Speed of liquid flow

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

Are not equal to each other in magnitude

Are equal to each other

Cannot be predicted

Are equal to each other in magnitude

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

0 N

8 N

20 N

4 N

183. The low blood pressure is known as

None of these

Low blood pressure

Systolic

Diastolic

184. 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

Kinetic energy

Momentum

Velocity

Total energy

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

968 J

1980 J

98 J

None of these

186. With the increase of temperature viscosity

Remains same

Decrease

Doubles

Increase

187. Surface tension of water is reduced by adding

Detergents

Plastic

Both A and B

Camphor

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

Variable acceleration

Constant terminal velocity

Constant acceleration (g)

Variable speed

189. 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.

16 N, 2 N

12 N, 6 N

10 N, 8 N

13 N, 5 N

190. 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:

10%

11%

9%

8%

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

Momentum

Kinetic energy

Angular momentum

Mass

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

The atmospheric pressure decreases there

The density of blood decreases at high altitudes

The blood pressure increase at high altitudes

The percentage of oxygen in the air increase

193. A chimney works best when it is

Tall

Not tall but wide

A and B

Exposed to air currents

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

Linear momentum

None of these

Linear impulse

Force

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

Force and displacement are perpendicular to each other

The force is always away from the center

There is no displacement

There is no net force

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

Turbulent

Mixed

None of these

Laminar

197. 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 (1/2)mv²

The momentum changes by mv

The kinetic energy changes by mv²

The momentum changes by 2mv

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

Centripetal force and radius

Moment of inertia and angular velocity

Mass and angular velocity

Linear velocity and angular velocity

199. 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

350 J

100 J

3430 J

5 J

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

Diameter of the body

Square of the diameter of the body

Radius of the body

Size of the body

Page 9 of 11

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

3

2

4

1

202. The unit of inductance is equivalent to

Volt x ampere/second

Volt x second/ampere

Volt/ampere x second

Ampere/volt x second

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

Doubles

Increases

Does not change

Decreases

204. 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

10 km/h

37.5 km/h

42 km/h

40 km/h

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

Constant

Both

None of these

Change

206. 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

Both hit the ground at the same velocity

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

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

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

The object must be at rest

The object is moving at constant speed

The acceleration of the object is zero

The object can be at rest

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

1 N

4.9 N

9.8 N

Cannot be calculated

209. 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

17 m/s

None of these

33 m/s

210. 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 moves in straight line

Its acceleration is constant

Its kinetic energy is constant

Its velocity is constant

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

C

B x C

B . C

B

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

Constant terminal velocity

Constant acceleration (g)

Variable acceleration

Variable speed

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

Not conserved

None of these

Somewhat conserved

Conserved

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

Equal both

Both

Solid cylinder

Solid sphere

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

Strength

Elasticity

Ductility

Stiffness

216. Which of the following quantity is dimensionless?

None of these

Gravitational constant

Plank’s constant

Power of lens and gas constant

217. 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

2 : 5

1 : 1

218. A jet engine works on the principle of

Conservation of mass

Conservation of linear momentum

Conservation of angular momentum

Conservation of energy

219. 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

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

Tangential

Centripetal

Centrifugal

Radial

221. 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

2.5 x 10¯³ Ns

1.5 x 10¯³ Ns

0.15 x 10¯³ Ns

0.98 x 10¯³ Ns

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

Minimum

Infinite

Maximum

Zero

223. 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 mass of water flowing per second

Increase the volume to water flowing per second

Avoid wastage of water

224. 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)

1.0 kg wt

Zero

0.5 kg wt

2.0 kg wt

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

Remains same

Decreases

First increases, then decreases

Increases

Page 10 of 11

226. V = √2g(h₁ – h₂) shows the

Torricelli’s theorem

None of these

Equation of continuity

Bernoulli’s theorem

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

Outside the circle

Center of the circle

Inside the circle

On the circumference of the circle

228. 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 the angle

Still 76 cm

76 cm plus the angle

76 cm minus a function of the angle

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

Moving

Moving slowly

Moving fast

Stationary

230. Velocity of fluid increases where the pressure is

High

Constant

Low

Changes continuously

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

More than 2mg

More than mg

Mg/2

Mg

232. Internal friction of fluid is called

Resistance

Surface tension

Cohesive force

Viscosity

233. Wb/m² is equal to

Watt

Dynes

Henry

Tesla

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

Parallel to each other

Antiparallel to each other

Inclined to each other at an angle of 45°

Perpendicular to each other

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

2 and 3

4 and 5

1 and 2

3 and 4

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

By spitting or sneezing

By jumping

By rolling your body on the surface

By running on the plane

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

Fluid

Momentum

Mass

Energy

238. Surface area is

Both scalar and vector

Scalar

Neither scalar nor vector

Vector

239. 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

It moves in a circular path

None of these

Velocity is constant

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

Increases

Decreases

None of these

Decreases rapidly

241. 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 : 1

1 : 4

1 : 2

242. 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

243. 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 air

Weight in the liquid

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

Pressure between the narrow gap decreases

Both A and B

None

Air velocity between the narrow gap increases

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

Final velocity

Initial velocity

Terminal velocity

Instantaneous velocity

246. Unite of impulse in

Newton

Kg m/s

Kg m

Joule

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

Kinetic energy decreases

Momentum decreases

Kinetic energy increases

Momentum increases

248. 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

½ of 4 cm diameter pipe

Twice

4 times

249. 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?

300 gf

400 gf

700 gf

500 gf

250. The rectangular components of force 5 dyne are

1 and 2 dyne

2.5 and 25 dyne

3 and 4 dyne

2 and 3 dyne

Page 11 of 11

251. 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

8000 m

200 m

300 m

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

M⁰L⁰T²

M⁰LT²

MLT⁰

ML⁰T⁰

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

Acceleration

Velocity

None of these

Force

254. Which of the following is the smallest unit?

Fermi

Millimeter

Meter

Angstrom

255. 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 forward direction on the front wheel and in the backward direction on the rear wheel

In the backward direction on both the wheels

In the forward direction on bath the wheels

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

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

Increases

Decreases

Zero

Remains same

257. 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

P²t²/2m

P²t²/3m

P²t²/m

Pt/2m

258. Blood has a density

None of these

Greater then water

Equal to water

Lesser then water

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

Infinite

Maximum

Equal to what is in turbulent flow

Minimum

260. Angular momentum is

Either A. or B.

A scalar

A vector

Neither A. nor B.

261. 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

Heat up the air which lifts the rocket

Push against the earth

262. 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

First increase and then decrease

Go on decreasing

Go no increasing

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

Mobile oil

Thick tar

Honey

All of these

264. 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 density of blood decreases at high altitudes

The atmospheric pressure decreases there

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

Mass

Kinetic energy

Momentum

Speed

266. 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 contains hydrogen atoms, air does not

Water molecules are larger than molecules in the air

Water molecules are smaller than molecules in the air

Surface tension of the water prevents it from

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

0.218 m/s²

0.03 m/s²

0.027 m/s²

0.20 m/s²

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

M(g – a)

0

Mg

M(g + a)

269. 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

5 N

2 N

8 N

12 N

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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ECAT Physics Fluid Dynamics Online Test

ECAT Physics Fluid Dynamics Online Test