ECAT Physics Fluid Dynamics Chapter Online Test

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Physics

1. 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

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

Remain unchanged

Decrease

Increase

Become zero

3. 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

120°

60°

90°

150°

4. Numerical value of magnitude of a physical quantity is

Independent of system of units

Directly proportional to magnitude of the unit

Inversely proportional to magnitude of the unit

Either (B) or (C)

5. The electrical forces are

Repulsive

None

Attractive

Both A and B

6. 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

7. 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 time of flight will be same

Their maximum height will be same

Their range will be same

8. The low blood pressure is

70 – 80 torr

75 – 80 torr

78 – 809 torr

79 – 80 torr

9. With the increase of temperature viscosity

Doubles

Decrease

Increase

Remains same

10. Pick out the wrong pair:

Sp. gravity-hygrometer

Pressure-barometer

Charge-coulomb

Temperature-thermometer

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

Maximum

Minimum

Zero

Infinite

12. Which of the following quantities is a vector

Density

Temperature

Volume

Displacement

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

Fluid

Momentum

Mass

Energy

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

Honey

Thick tar

All of these

Mobile oil

15. Blood has a density

Greater then water

Equal to water

Lesser then water

None of these

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

High

Zero

Low

Constant

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

Limiting friction

Static friction

Rolling friction

Dynamic friction

18. 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

19. Angular momentum has the same unit as

Power x time

Impulse x distance

Linear momentum x time

Work x frequency

20. Velocity of fluid increases where the pressure is

High

Constant

Low

Changes continuously

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

Laminar flow

Turbulent flow

Both a and b

None of these

22. Swimming is based on the principle of

Newton’s 3rd law

All

Newton’s 2nd law

Newton’s 1st law

23. 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 = t₂/4

t₁ = t₂/2

t₁ = t₂

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

6.29 x 10¯³

6.18 x 10¯³

6.12 x 10¯³

6.49 x 10¯³

25. 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

T₁ > T₂

T₂ > T₁

T₁ = T₂

Tension in the string always remains the same

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

All of these

Sound heard

Initially turbulent

High flow speed

27. 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 m/s

50 m/s

5 cm/s

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

Heat up the air which lifts the rocket

Push against the air

Push against the earth

React against the rocket and push it up

29. 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?

700 gf

400 gf

300 gf

500 gf

30. The atmosphere is held to the earth by

The rotation of earth

Gravity

Clouds

Winds

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

C

B

B . C

B x C

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

F₁ – 3 N, F₂ – 5 N, F₃ = 1 N

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

33. 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

16

13

14

18

34. A flowing liquid possesses

Pressure Energy

All

P.E.

K.E.

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

2 ms¯²

10 ms¯²

1 ms¯²

20 ms¯²

36. 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

None

2 cm

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

Surface energy

Equation of continuity

Bernoulli’s equation

Magnus effect

38. Force of friction is present in

All of these

Solid

Liquid

Gases

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

The blood pressure increase at high altitudes

The density of blood decreases at high altitudes

The atmospheric pressure decreases there

The percentage of oxygen in the air increase

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

Momentum

Mass

Energy

None

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

Variable speed

Constant acceleration (g)

Variable acceleration

Constant terminal velocity

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

Mass of fluid

Volume of fluid

Density of fluid

Flow rate

43. The high blood pressure is

110 torr

120 torr

100 torr

130 torr

44. Internal friction of fluid is called

Surface tension

Resistance

Viscosity

Cohesive force

45. The blood vessels are inflated even in

None of these

Working state between heart beat

Relaxed states between heart beat

Occasionally

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

π/2

π/4

π

π/3

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

4 times

Half

Double

¼ times

48. 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

More than 3 dynes

Between 3 and 4 dyne

Between 1 and 7 dyne

49. 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

0.03 m/s²

0.20 m/s²

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

Weight in the liquid

Weight in air

Weight in water

Density

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51. Substance which flows easily are

Kerosene oil

Petrol

Water

All of these

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

Exactly equal

Roughly equal

Zero

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

All of these

Law of conservation of mass

Law of conservation of momentum

Law of conservation of energy

54. Stoke’s law is applicable to

Motion through horizontal surface

Motion through free space

Motion through non-resistive medium

Motion through viscous medium

55. A jet engine works on the principle of

Conservation of linear momentum

Conservation of mass

Conservation of energy

Conservation of angular momentum

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

Light year and time

Torque and work

Angular momentum and work

Energy and Young’s modulus

57. 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?

9.8 m

50 m

25 m

20 m

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

Increases

Remains same

Decreases

First A and Then B

59. 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

2 N

12 N

5 N

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

Variable speed

Constant acceleration (g)

Constant terminal velocity

Variable acceleration

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

Increases

Remains same

Decreases

Zero

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

Large

Very large

None of these

Small

63. 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

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

Compressibility

Surface tension

Density

Solar constant

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

High

Constant

Low

Zero

66. 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

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

Both hit the ground at the same speed

Both hit the ground at the same velocity

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

Moment of inertia increases

Angular momentum decreases

Angular momentum increases

Moment of inertia decreases

68. The unit of inductance is equivalent to

Volt x ampere/second

Volt x second/ampere

Volt/ampere x second

Ampere/volt x second

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

Its acceleration is also doubled

Its potential energy is also doubled

Its kinetic energy is also doubled

Its momentum is also doubled

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

25.23 km

22.46 km

22.36 km

20 36 km

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

Increases

Remains same

Decreases

Zero

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

None of these

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

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

Electric flux

Both a and b

Magnetic flux

Mass flux

74. An instrument called a sphygmomanometer measure

Milk density

Blood pressure

None of these

Density of water

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

Friction due to tyres

Force by steering wheel

The drive of the car

Force of brakes

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76. 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

The slower one

Depends on their mass

77. The low blood pressure is known as

Diastolic

None of these

Low blood pressure

Systolic

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

Remains unchanged

None of these

Increases

Decreases

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

Maximum

Variable

Zero

Infinite

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

Mass

Momentum

All

Energy

81. Bernoulli’s equation is applicable for

Turbulent flow

None of these

Both laminar and turbulent flow

Laminar flow

82. 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 zero

Change in KE is ½ mv²

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

h₁ – h₂

None of these

(h₁ – h₂) and falling under gravity

Action of gravity

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

Twice

Once

Four times

Thrice

85. Wb/m² is equal to

Watt

Henry

Dynes

Tesla

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

The ball had covered less 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 more than half the distance

The ball had covered exactly half the distance

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

1 m/s

None of these

2 m/s

4 m/s

88. 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 : 1

2 : 5

1 : 5

89. At high speeds the force is no longer

None of these

Simply proportional

No proportion

Proportional

90. 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

0.98 x 10¯³ Ns

0.15 x 10¯³ Ns

91. 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

1.5

3.0

1.3

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

Variable speed and constant velocity

Constant acceleration

Constant retardation

Variable acceleration

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

Centrifugal

Tangential

Centripetal

Radial

94. At terminal velocity, fluid friction is

Minimum

Zero

None of these

Maximum

95. 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:

60°

40°

45°

50°

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

Ideal fluid

Non-ideal fluid

All

Prefect fluid

97. The Bernoulli’s equation is based on the

Law of conservation of momentum

All of these

Law of conservation of energy

Law of conservation of mass

98. 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

Outside the circle

Inside the circle

Center of the circle

99. Which of the following is the smallest unit?

Angstrom

Fermi

Millimeter

Meter

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

1980 J

None of these

968 J

98 J

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101. 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

Cohesion between the gas molecules and the container

Surface tension of the gas

102. A chimney works best when it is

Not tall but wide

Exposed to air currents

A and B

Tall

103. The blood pressure of the person

Increases with age

None

Decreases with age

Remains the same

104. Unite of impulse in

Newton

Kg m

Kg m/s

Joule

105. In a uniform circular motion

Velocity and acceleration remain constant

Only velocity change, acceleration remain constant

Kinetic energy remain constant

Speed and acceleration change

106. 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

107. Surface tension of water is reduced by adding

Detergents

Both A and B

Plastic

Camphor

108. Length cannot be measured by

Debye

Light year

Micron

Fermi

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

Mass of the body

Linear kinetic energy of the body

Linear velocity of the body

Force in linear motion

110. 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

1300 m

1500 m

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

None of these

Slowly moves in one direction

Moves along the same path as

Moves in different direction

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

Final velocity

Terminal velocity

Initial velocity

Instantaneous velocity

113. 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

1.0 kg wt

2.0 kg wt

Zero

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

Is zero

Is equal to that of B

Is greater than that of B

Is smaller than that of B

115. 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

116. Reason of weightlessness in a satellite is

Center of mass

Zero gravity

Zero reaction force by satellite surface

None of these

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

2 J

4 J

1 J

3 J

118. 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

14.7 m

4.9 m

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

On the train

On himself

Towards the train

Away from the train

120. 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

None of these

33 m/s

17.5 m/s

17 m/s

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

Remains same

Increases

First increases, then decreases

Decreases

122. 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

Cannot be predicted

Are equal to each other in magnitude

Are equal to each other

123. Angular momentum is

Scalar

Polar vector

At 45° angle

Axial vector

124. 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 still moves with the same velocity

It will be just floating at the same point in space

125. 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 smaller than molecules in the air

Water molecules are larger than molecules in the air

Surface tension of the water prevents it from

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126. 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

Zero

2 Mg

127. 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 7/13

cos¯¹ 5/13

cos¯¹12/13

cos¯¹ 5/12

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

When a net eternal torque is acting upon the system

None of these

When a net external impulse is acting upon the system

When net external force is acting upon the system

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

Angular momentum

Work

Energy

Linear momentum

130. 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

Conserved

Somewhat conserved

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

Slide upon each other

Stick to each other

Roll upon each other

None of these

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

Fv²

Fv

v/F

F/v

133. The unit of focal power of a lens is

Diopter

Kilo watt

Horse power

Watt

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

(1/R)²

1/R

R²

R

135. 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)

Mg

0

136. 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

200

20,000

2000

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

Cannot be calculated

9.8 N

4.9 N

1 N

138. Surface area is

Scalar

Both scalar and vector

Neither scalar nor vector

Vector

139. 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

Total energy

Momentum

Velocity

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

Maximum

Minimum

Equal to what is in turbulent flow

Infinite

141. The term Brownian movement refers to

Convection currents in a liquid or gas

The stretching of a body beyond its elastic limit

Convection currents in a gas but not in a liquid

Irregular motions of small particles suspended in a fluid

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

¼ time

4 times

Double

Half

143. V = √2g(h₁ – h₂) shows the

Torricelli’s theorem

Bernoulli’s theorem

None of these

Equation of continuity

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

Air currents of the earth atmosphere

Surface tension effect

Up thrust of air

Viscous force exerted by air

145. The Systolic blood pressure comes when

None of these

Cutting off the blood flow

All of these

Vessel collapse

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

8 N

20 N

4 N

0 N

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

Change

Both

None of these

Constant

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

Mass and angular velocity

Moment of inertia and angular velocity

Linear velocity and angular velocity

Centripetal force and radius

149. The angular momentum of a body is conserved if

Force acting on it is zero

Torque acting on it is zero

Torque acting on it is constant

Force acting on it is constant

150. 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

P/4

2P

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151. Which of the following quantity is dimensionless?

Power of lens and gas constant

Plank’s constant

Gravitational constant

None of these

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

Increase the velocity of water flowing out

Avoid wastage of water

Increase the volume of water flowing per second

Increase the mass of water flowing per second

153. 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

5 s

3 s

9 s

154. 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

10 N, 8 N

12 N, 6 N

13 N, 5 N

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

Pressure, stress

Work, energy

Velocity, speed

Force, impulse

156. 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

7,200 N

100,000 N

157. 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

158. Dot product of two mutual perpendicular vector is:

∞

1

0

None of these

159. 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

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

64 cm

640 cm

64 m

0.064 m

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

Momentum

Angular momentum

Energy

Power

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

Acceleration

Velocity

Force

None of these

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

Centrifugal force

Gravitational force

Centripetal force

All of these

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

Strength

Stiffness

Elasticity

Ductility

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

Light object

Data is not sufficient

Both have the same momentum

Heavy object

166. 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

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

To fall at an angle going from west to east

167. 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

W/2

Zero

W

2W

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

The ground on the horse

The horse on the ground

The horse on the cart

The ground on the cart

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

2R

(3/2)R

R

4R

170. 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/m

P²t²/2m

P²t²/3m

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

Terminal velocity

Initial velocity

Final velocity

Instantaneous velocity

172. 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 kinetic energy changes by mv²

The momentum changes by mv

The momentum changes by 2mv

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

0.594 x 10¯³

0.599 x 10¯³

0.521 x 10¯³

0.564 x 10¯³

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

In a steady state

Incompressible

Non-viscous

All of these

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

Doubles

Does not change

Increases

Decreases

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

The object can be at rest

The object is moving at constant speed

The acceleration of the object is zero

The object must be at rest

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

Mass

Momentum

Kinetic energy

Speed

178. 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

None of these

4.9 m/s²

179. 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

5 J

3430 J

180. 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?

1 m/s

4 m/s

8 m/s

2 m/s

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

Acceleration

Kinetic energy

Centripetal force

Velocity

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

Repulsive

None

Attractive

Both A and B

183. Identify the pair whose dimensions are equal

Force and work

Force and stress

Stress and energy

Torque and work

184. 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

N

0.05 N

0.5 N

Zero

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

4 times

2 times

6 times

8 times

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

1

4

2

3

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

Remains constant

Become four times, its initial value

Become twice its initial value

Become three times, its initial value

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

There is no displacement

The force is always away from the center

There is no net force

Force and displacement are perpendicular to each other

189. 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 h¹⁄ ²

Independent of h

Proportional to h

190. S.I unit of magnetic flux is

Weber metre¯²

Weber

Weber per metre⁴

Weber per metre

191. 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

2.8 joule

3.8 joule

4.4 joule

192. 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

2 x 10⁵ s

1 x 10⁶ s

2 x 10⁶ s

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

None

Air velocity between the narrow gap increases

Pressure between the narrow gap decreases

Both A and B

194. 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

A/v = constant

v/A = constant

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

Linear impulse

Linear momentum

None of these

Force

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

Equal to weight of liquid displaced

Weight of body-weight of liquid displaced

Zero

Less than the weight of liquid displaced

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

1 mm/s

1 nm/s

1 μm/s

1 cm/s

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

Antiparallel to each other

Inclined to each other at an angle of 45°

Perpendicular to each other

Parallel to each other

199. 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

√2gh

√gh

.gh

200. 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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201. Drag force is given by

Pascal’s law

Gauss law

Newton’s law

Stokes law

202. 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%

8%

9%

203. 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

None of these

2 x 10² cm³

204. Coefficient of viscosity of honey is greater than

Alcohol

Petrol

Water

Milk

205. 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

19.6 m/s

9.8 m/s

206. A flowing liquid possesses

P.E.

K.E.

All

Pressure Energy

207. 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 m/s²

8 radian/s²

208. 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

22 m

6 m

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

Irregular

Steady

Unsteady

B and C

210. 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

Solid cylinder

Solid sphere

Both

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

3 x 10¯¹⁰ J

3 x 10¯¹⁹ J

4.5 x 10¯¹⁹ J

4.5 x 10¯¹⁰ J

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

3 : 1

1 : 3

1 : 1

2 : 1

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

Calorie

Electron-volt

Watt

Joule

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

Mg/2

Mg

More than mg

More than 2mg

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

Angular acceleration

No acceleration

None of these

Linear acceleration

216. 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

Four times the initial value

Twice the initial value

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

Increase the volume to water flowing out

Avoid wastage of water

Increase the volume to water flowing per second

Increase the mass of water flowing per second

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

1 : 1

1 : 4

1 : 2

4 : 1

219. 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

37.5 km/h

10 km/h

40 km/h

42 km/h

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

An electron captured by a proton

A bullet striking a bag of sand

Striking of two glass balls

A man jumping onto a moving cart

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

None of these

Laminar

Mixed

Turbulent

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

1.012 x 10¯³

1.000 x 10¯³

1.014 x 10¯³

0.954 x 10¯³

223. Venturi relation is used measure

Pressure of the liquid

Density of the liquid

Height of the pipe

Speed of liquid flow

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

Kinetic energy

Angular momentum

Mass

Momentum

225. 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

None of these

Moment of inertia depends on choice of axes

Page 10 of 11

226. 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

√2gh

gh

√gh

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

Decreases rapidly

Increases

None of these

Decreases

228. 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

129600

36000

72000

229. 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

0.1 m/s

0.01 m/s

10 m/s

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

Moving fast

Moving slowly

Stationary

Moving

231. 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

It moves in a circular path

Linear momentum is constant

None of these

Velocity is constant

232. 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 minus a function of the angle

76 cm plus the angle

233. The concentration of red blood cells in blood is

~ 30%

~ 50%

– 40%

– 45%

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

Unity or more

Unity

Less than unity

Unity or less

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

Linear momentum

Angular momentum

Mass

Energy

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. 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 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

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

1 : 2 : 3

None of these

1 : 4 : 9

1 : 3 : 5

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

Rough

Square

Spherical

Circular

240. 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

8000 m

300 m

200 m

11000 m

241. When fluid is incompressible then

Flow of the fluid is straight line

Velocity of the fluid is constant

Density of the fluid is constant

Volume of the fluid is constant

242. Angular momentum is

Neither A. nor B.

A vector

A scalar

Either A. or B.

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

Momentum decreases

Kinetic energy increases

Momentum increases

Kinetic energy decreases

244. The direction of the angular velocity vector is along

The axis of rotation

The inward radius

The tangent to the circular path

The outward radius

245. Ball pen functions on the principle of

Viscosity

Surface tension

Boyle’s law

Gravitational force

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

A deuteron

An α particle

A proton

An electron

247. 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°

60°

None of these

90°

248. The mass of the block is

3000 g

None of these

30001 b

21,000 g

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

In the forward direction on the rear wheel

In the forward direction on both the wheels

In the backward direction on both the wheels

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

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

0.301 x 10¯³

0.295 x 10¯³

0.198 x 10¯³

0.224 x 10¯³

Page 11 of 11

251. 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:

5.5 km/s

11 km/s

16.5 km/s

22 km/s

252. 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

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

Radius of the body

Size of the body

Diameter of the body

Square of the diameter of the body

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

90°

120°

0°

60°

255. 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

Twice

4 times

¼ times

½ of 4 cm diameter pipe

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

Torricelli’s theorem

Venturi relation

Bernoulli’s equation

None of these

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

None of these

Increase

Decreases

Zero

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

Mass distribution

Angular velocity

Axis of rotation

Mass of object

259. 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 minimum if the body is thrown horizontally

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

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

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

The density of blood decreases at high altitudes

The percentage of oxygen in the air increase

The atmospheric pressure decreases there

The blood pressure increase at high altitudes

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

M⁰L⁰T²

ML⁰T⁰

M⁰LT²

MLT⁰

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

55%

77%

44%

66%

263. 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

0.1 m

Full length of the capillary tube

0.98 m

0.2 m

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

The height of the table

The time taken in this work

The actual path taken

The speed of the particle

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

40 km/h

36 km/h

80 km/h

50√2 km/h

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

Car will cover less distance before rest

Both will cover equal distance

None of these

Truck will cover less distance before rest

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

60 N

15 N

30 N

21 N

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

1 and 2

3 and 4

4 and 5

2 and 3

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

sin¯¹(P/Q)

tan¯¹(P/Q)

cos¯¹(-P/Q)

tan¯¹(-P/Q)

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