ECAT Physics Fluid Dynamics Chapter Online Test

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Physics

1. Length cannot be measured by

Micron

Debye

Light year

Fermi

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

More than mg

More than 2mg

Mg/2

Mg

3. 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

4. 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

350 J

3430 J

100 J

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

Work

Energy

Linear momentum

Angular momentum

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

The actual path taken

The height of the table

The speed of the particle

The time taken in this work

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

40 km/h

10 km/h

42 km/h

37.5 km/h

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

Increase

Zero

Decreases

None of these

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

Axis of rotation

Mass distribution

Angular velocity

Mass of object

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

A proton

An electron

An α particle

A deuteron

11. Coefficient of viscosity of honey is greater than

Alcohol

Petrol

Milk

Water

12. 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

1 m/s

4 m/s

2 m/s

13. The direction of the angular velocity vector is along

The inward radius

The tangent to the circular path

The outward radius

The axis of rotation

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

Both

None of these

Change

Constant

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

B

C

B . C

B x C

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

Infinite

Zero

Maximum

Variable

17. 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 1 and 7 dyne

Between 3 and 4 dyne

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

High flow speed

Initially turbulent

Sound heard

All of these

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

9.8 N

Cannot be calculated

4.9 N

1 N

20. Venturi relation is used measure

Speed of liquid flow

Density of the liquid

Height of the pipe

Pressure of the liquid

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

Double

4 times

Half

¼ times

22. The rectangular components of force 5 dyne are

1 and 2 dyne

3 and 4 dyne

2 and 3 dyne

2.5 and 25 dyne

23. 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

Linear acceleration

None of these

24. The blood vessels are inflated even in

Relaxed states between heart beat

Working state between heart beat

None of these

Occasionally

25. 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

Still 76 cm

76 cm minus the angle

76 cm plus the angle

76 cm minus a function of the angle

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26. 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

2gh

gh

27. Velocity of fluid increases where the pressure is

High

Low

Constant

Changes continuously

28. The low blood pressure is known as

None of these

Low blood pressure

Systolic

Diastolic

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

6.29 x 10¯³

6.49 x 10¯³

6.12 x 10¯³

6.18 x 10¯³

30. 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

v/A = constant

None of these

31. 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 = 4t₂

t₁ = t₂

t₁ = t₂/2

32. 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

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

0.027 m/s²

0.218 m/s²

0.03 m/s²

0.20 m/s²

34. 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

Go no increasing

Remains the same

First increase and then decrease

35. 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

None of these

It moves in a circular path

Velocity is constant

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

cos¯¹(-P/Q)

tan¯¹(-P/Q)

sin¯¹(P/Q)

tan¯¹(P/Q)

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

Non-ideal fluid

Ideal fluid

All

Prefect fluid

38. 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

39. 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 horse on the ground

The ground on the horse

The ground on the cart

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

Constant retardation

Variable acceleration

Variable speed and constant velocity

Constant acceleration

41. The mass of the block is

None of these

30001 b

3000 g

21,000 g

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

90°

60°

120°

None of these

43. Identify the pair whose dimensions are equal

Torque and work

Stress and energy

Force and stress

Force and work

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

Centripetal

Tangential

Centrifugal

Radial

45. 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 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 velocity

46. 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 : 4

1 : 2

1 : 1

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

Solar constant

Surface tension

Density

Compressibility

48. 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

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

None of these

Velocity

Acceleration

Force

50. 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

17.5 m/s

17 m/s

None of these

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

Less than the weight of liquid displaced

Equal to weight of liquid displaced

Weight of body-weight of liquid displaced

Zero

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

Both a and b

Magnetic flux

Electric flux

Mass flux

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

4R

2R

R

(3/2)R

54. Substance which flows easily are

Petrol

Water

All of these

Kerosene oil

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

None of these

When net external force is acting upon the system

When a net eternal torque is acting upon the system

When a net external impulse is acting upon the system

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

400 gf

500 gf

700 gf

300 gf

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

Striking of two glass balls

A bullet striking a bag of sand

An electron captured by a proton

A man jumping onto a moving cart

58. Bernoulli’s equation is applicable for

Laminar flow

Turbulent flow

None of these

Both laminar and turbulent flow

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

Truck will cover less distance before rest

Both will cover equal distance

None of these

Car will cover less distance before rest

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

It will be just floating at the same point in space

It will lose its velocity gradually

It will be fall down instantaneously

It still moves with the same velocity

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

Solid sphere

Solid cylinder

Both

Equal both

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

In a steady state

Non-viscous

All of these

Incompressible

63. A flowing liquid possesses

Pressure Energy

P.E.

All

K.E.

64. 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

v/A = constant

A/v = constant

Av = constant

65. In a uniform circular motion

Only velocity change, acceleration remain constant

Speed and acceleration change

Velocity and acceleration remain constant

Kinetic energy remain constant

66. The Bernoulli’s equation is based on the

Law of conservation of momentum

All of these

Law of conservation of mass

Law of conservation of energy

67. A flowing liquid possesses

K.E.

P.E.

Pressure Energy

All

68. S.I unit of magnetic flux is

Weber metre¯²

Weber per metre

Weber per metre⁴

Weber

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

Somewhat conserved

None of these

Conserved

Not conserved

70. An instrument called a sphygmomanometer measure

Milk density

Blood pressure

None of these

Density of water

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

Twice the initial value

Same as the initial value

Four times the initial value

Thrice the initial value

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

2 times

6 times

8 times

4 times

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

Decreases rapidly

None of these

Increases

Decreases

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

Change in KE is mv²

Change in KE is ½ mv²

Momentum change is mvr

Change in KE is zero

75. 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 h²

Proportional to h¹⁄ ²

Proportional to h

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

Magnus effect

Surface energy

Equation of continuity

Bernoulli’s equation

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

The kinetic energy changes by mv²

The momentum changes by mv

The momentum changes by 2mv

The kinetic energy changes by (1/2)mv²

78. 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

Tension in the string always remains the same

T₁ > T₂

T₂ > T₁

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

Remains same

Increases

Decreases

Zero

80. Ball pen functions on the principle of

Surface tension

Boyle’s law

Gravitational force

Viscosity

81. Which of the following is true?

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

Both momentum and kinetic energy are conserved in all collisions

82. 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

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

Fluid

Momentum

Energy

Mass

84. Angular momentum is

A scalar

Either A. or B.

A vector

Neither A. nor B.

85. 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.

13 N, 5 N

16 N, 2 N

12 N, 6 N

10 N, 8 N

86. 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

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

Weight in water

Density

Weight in the liquid

Weight in air

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

Both will reach simultaneously

Depends on their mass

The slower one

The faster one

89. 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

Zero

N

90. 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

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

Mass

Momentum

Kinetic energy

Speed

92. 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

8 N

12 N

5 N

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

On himself

Towards the train

Away from the train

On the train

94. With the increase of temperature viscosity

Doubles

Increase

Decrease

Remains same

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

Increase

Decrease

Become zero

Remain unchanged

96. A chimney works best when it is

A and B

Not tall but wide

Tall

Exposed to air currents

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

80 km/h

36 km/h

50√2 km/h

40 km/h

98. A jet engine works on the principle of

Conservation of linear momentum

Conservation of angular momentum

Conservation of mass

Conservation of energy

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

Variable acceleration

Constant acceleration (g)

Variable speed

Constant terminal velocity

100. 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

Surface tension of the water prevents it from

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

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101. The electrical forces are

Attractive

Repulsive

Both A and B

None

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

1 and 2

4 and 5

2 and 3

3 and 4

103. Angular momentum has the same unit as

Linear momentum x time

Work x frequency

Power x time

Impulse x distance

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

1/R

(1/R)²

R

R²

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

Avoid wastage of water

Increase the volume to water flowing out

Increase the mass of water flowing per second

Increase the volume to water flowing per second

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

Its potential energy is also doubled

Its acceleration is also doubled

Its momentum is also doubled

Its kinetic energy is also doubled

107. Pick out the wrong pair:

Sp. gravity-hygrometer

Temperature-thermometer

Pressure-barometer

Charge-coulomb

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

Kinetic energy

Mass

Momentum

Angular momentum

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

In the backward direction on both the wheels

In the forward direction on bath the wheels

110. Which of the following quantities is a vector

Density

Displacement

Volume

Temperature

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

Circular

Spherical

Rough

Square

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

50 m

20 m

9.8 m

25 m

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

64 m

64 cm

0.064 m

640 cm

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

Mass and angular velocity

Centripetal force and radius

Linear velocity and angular velocity

Moment of inertia and angular velocity

115. 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

Roughly equal

Unequal

Exactly equal

116. 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

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

Does not change

Decreases

Doubles

Increases

118. 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)

2.0 kg wt

Zero

0.5 kg wt

1.0 kg wt

119. Numerical value of magnitude of a physical quantity is

Independent of system of units

Directly proportional to magnitude of the unit

Either (B) or (C)

Inversely proportional to magnitude of the unit

120. Surface area is

Neither scalar nor vector

Scalar

Both scalar and vector

Vector

121. 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

2000

200

20,000

122. 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

123. 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 earth

Push against the air

React against the rocket and push it up

124. 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

1.5 x 10¯³ Ns

0.15 x 10¯³ Ns

0.98 x 10¯³ Ns

2.5 x 10¯³ Ns

125. 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 7/13

cos¯¹ 5/13

cos¯¹ 5/12

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

Constant

High

Low

Zero

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

77%

44%

55%

66%

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

20 36 km

22.46 km

22.36 km

25.23 km

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

Both A and B

Attractive

None

Repulsive

130. 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 east to west

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

To fall at an angle going from west to east

To fall vertically down

131. 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 radian/s²

16 m/s²

8 radian/s²

132. Surface tension of water is reduced by adding

Camphor

Plastic

Both A and B

Detergents

133. Blood has a density

Greater then water

Lesser then water

Equal to water

None of these

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

The drive of the car

Friction due to tyres

Force by steering wheel

Force of brakes

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

Stationary

Moving

Moving slowly

Moving fast

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

The object can be at rest

The object must be at rest

The object is moving at constant speed

The acceleration of the object is zero

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

0°

90°

120°

60°

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

16.5 km/s

11 km/s

22 km/s

5.5 km/s

139. 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

9.8 m

4.9 m

19.6 m

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

Perpendicular to each other

Inclined to each other at an angle of 45°

Antiparallel to each other

Parallel to each other

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

Surface tension effect

Air currents of the earth atmosphere

Up thrust of air

Viscous force exerted by air

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

200 m

100 m

400 m

300 m

143. 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

19.6 m/s

9.8 m/s

98.0 m/s

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

1.012 x 10¯³

0.954 x 10¯³

1.014 x 10¯³

1.000 x 10¯³

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

Volume of fluid

Density of fluid

Flow rate

Mass of fluid

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

Law of conservation of mass

All of these

Law of conservation of energy

Law of conservation of momentum

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

60 N

30 N

15 N

21 N

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

0.594 x 10¯³

0.564 x 10¯³

0.599 x 10¯³

0.521 x 10¯³

149. Dot product of two mutual perpendicular vector is:

0

1

None of these

∞

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

There is no displacement

Force and displacement are perpendicular to each other

There is no net force

The force is always away from the center

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

Avoid wastage of water

Increase the velocity of water flowing out

Increase the mass of water flowing per second

Increase the volume of water flowing per second

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

Variable acceleration

Constant acceleration (g)

Constant terminal velocity

Variable speed

153. 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 does not depend on the direction of which it is thrown

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

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

154. V = √2g(h₁ – h₂) shows the

Equation of continuity

Torricelli’s theorem

Bernoulli’s theorem

None of these

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

Elasticity

Strength

Stiffness

Ductility

156. Which of the following is the smallest unit?

Millimeter

Meter

Fermi

Angstrom

157. The angular momentum of a body is conserved if

Force acting on it is constant

Torque acting on it is constant

Force acting on it is zero

Torque acting on it is zero

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

None of these

Large

Small

Very large

159. 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 ball had covered more than half the distance

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

The ball had covered exactly half the distance

160. 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

161. Which of the following quantity is dimensionless?

Plank’s constant

None of these

Gravitational constant

Power of lens and gas constant

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

By jumping

By rolling your body on the surface

By running on the plane

By spitting or sneezing

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

Mass

Angular momentum

Linear momentum

Energy

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

π

π/2

π/4

π/3

165. 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°

50°

40°

60°

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

None of these

1980 J

98 J

968 J

167. Drag force is given by

Stokes law

Gauss law

Pascal’s law

Newton’s law

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

The blood pressure increase at high altitudes

The density of blood decreases at high altitudes

The percentage of oxygen in the air increase

The atmospheric pressure decreases there

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

Mass

Energy

None

Momentum

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

Force

None of these

Linear impulse

Linear momentum

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

22 m

33 m

6 m

7.8 m

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

Laminar

Mixed

Turbulent

None of these

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

Slowly moves in one direction

Moves in different direction

Moves along the same path as

None of these

174. 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

100,000 N

7,200 N

3,600 N

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

F₁ – 3 N, F₂ – 5N, F₃ = 15 N

F₁ – 3 N, F₂ – 5 N, F₃ = 9 N

F₁ – 3 N, F₂ – 5 N, F₃ = 1 N

F₁ – 3 N, F₂ – 5N, F₃ = 6 N

Page 8 of 11

176. The atmosphere is held to the earth by

The rotation of earth

Winds

Gravity

Clouds

177. 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°

θ = 60°

None of these

θ = 90°

178. Reason of weightlessness in a satellite is

None of these

Center of mass

Zero reaction force by satellite surface

Zero gravity

179. The Systolic blood pressure comes when

All of these

Cutting off the blood flow

Vessel collapse

None of these

180. 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

5 s

3 s

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

4.5 x 10¯¹⁰ J

4.5 x 10¯¹⁹ J

3 x 10¯¹⁹ J

3 x 10¯¹⁰ J

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

4 N

8 N

20 N

0 N

183. The unit of focal power of a lens is

Diopter

Watt

Kilo watt

Horse power

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

Final velocity

Terminal velocity

Instantaneous velocity

Initial velocity

185. 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

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

3 J

4 J

1 J

2 J

187. 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

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

Half

4 times

¼ time

Double

189. Force of friction is present in

All of these

Gases

Solid

Liquid

190. 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

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

Are equal to each other in magnitude

Are equal to each other

Cannot be predicted

Are not equal to each other in magnitude

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

Moment of inertia decreases

Moment of inertia increases

Angular momentum decreases

Angular momentum increases

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

Zero

F/√2

E

E/2

194. The term Brownian movement refers to

The stretching of a body beyond its elastic limit

Convection currents in a gas but not in a liquid

Convection currents in a liquid or gas

Irregular motions of small particles suspended in a fluid

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

The percentage of oxygen in the air increase

The atmospheric pressure decreases there

The density of blood decreases at high altitudes

The blood pressure increase at high altitudes

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

Energy

All

Mass

Momentum

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

Decrease for liquids and increase for gases

Increase for liquids and decreases for gases

Increases for both

Decrease for both

198. 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

199. 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

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

2 : 1

3 : 1

1 : 3

1 : 1

Page 9 of 11

201. Unite of impulse in

Newton

Joule

Kg m

Kg m/s

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

Torque and work

Energy and Young’s modulus

Light year and time

Angular momentum and work

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

Size of the body

Radius of the body

Diameter of the body

Square of the diameter of the body

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

Remains same

Decreases

Increases

Zero

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

1500 m

1300 m

1400 m

1200 m

206. Angular momentum is

Polar vector

At 45° angle

Scalar

Axial vector

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

They are always at the same point

Center of mass changes but center of gravity is always same

None of these

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

208. 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

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

2

4

3

1

210. 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?

0.1 m/s

10 m/s

1 m/s

0.01 m/s

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

Instantaneous velocity

Terminal velocity

Final velocity

Initial velocity

212. Internal friction of fluid is called

Cohesive force

Resistance

Viscosity

Surface tension

213. 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

1 cm

8 cm

None

214. When fluid is incompressible then

Density of the fluid is constant

Flow of the fluid is straight line

Velocity of the fluid is constant

Volume of the fluid is constant

215. 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/m

Pt/2m

P²t²/3m

P²t²/2m

216. 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 m/s

5 m/s

5 cm/s

50 cm/s

217. 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

3.0

1.5

2.3

1.3

218. At terminal velocity, fluid friction is

Zero

Maximum

None of these

Minimum

219. 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%

9%

11%

10%

220. The unit of inductance is equivalent to

Ampere/volt x second

Volt/ampere x second

Volt x ampere/second

Volt x second/ampere

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

M⁰LT²

ML⁰T⁰

M⁰L⁰T²

MLT⁰

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

None of these

Bernoulli’s equation

Torricelli’s theorem

Venturi relation

223. Stoke’s law is applicable to

Motion through horizontal surface

Motion through free space

Motion through non-resistive medium

Motion through viscous medium

224. Wb/m² is equal to

Dynes

Watt

Henry

Tesla

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

Slide upon each other

None of these

Roll upon each other

Stick to each other

Page 10 of 11

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

Data is not sufficient

Heavy object

Both have the same momentum

Light object

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

0

Mg

M(g – a)

M(g + a)

228. 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 velocity is constant

Its acceleration is constant

Its kinetic energy is constant

229. The concentration of red blood cells in blood is

– 45%

– 40%

~ 30%

~ 50%

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

Both A and B

Pressure between the narrow gap decreases

None

Air velocity between the narrow gap increases

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

Become three times, its initial value

Become twice its initial value

Remains constant

Become four times, its initial value

232. The high blood pressure is

110 torr

120 torr

100 torr

130 torr

233. 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

½ of 4 cm diameter pipe

¼ times

4 times

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

Increases

First increases, then decreases

Remains same

Decreases

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

Unity

Unity or less

Less than unity

Unity or more

236. 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

237. 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

2 ms¯²

20 ms¯²

1 ms¯²

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

Infinite

Minimum

Maximum

Equal to what is in turbulent flow

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

Force, impulse

Velocity, speed

Work, energy

Pressure, stress

240. 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

2.8 joule

3.8 joule

3.2 joule

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

1 μm/s

1 nm/s

1 cm/s

1 mm/s

242. The low blood pressure is

70 – 80 torr

78 – 809 torr

75 – 80 torr

79 – 80 torr

243. 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

2 x 10⁶ s

1 x 10⁵ s

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

Honey

All of these

Thick tar

Mobile oil

245. The blood pressure of the person

Increases with age

Decreases with age

None

Remains the same

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

Angular momentum

Energy

Momentum

Power

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

Momentum decreases

Momentum increases

Kinetic energy increases

Kinetic energy decreases

248. 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:

None of these

1.763 x 10² cm³

1 x 10² cm³

2 x 10² cm³

249. 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

36000

72000

129600

360000

250. Swimming is based on the principle of

Newton’s 2nd law

All

Newton’s 3rd law

Newton’s 1st law

Page 11 of 11

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

Fv²

Fv

F/v

v/F

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

Rolling friction

Limiting friction

Dynamic friction

Static friction

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

Velocity

Centripetal force

Acceleration

Kinetic energy

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

Is smaller than that of B

Is equal to that of B

Is zero

Is greater than that of B

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

Joule

Electron-volt

Watt

Calorie

256. 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°

150°

60°

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

Infinite

Minimum

Zero

Maximum

258. 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 maximum height will be same

Their landing velocity will be same

Their time of flight will be same

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

None of these

4 m/s

2 m/s

1 m/s

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

Both a and b

Laminar flow

None of these

Turbulent flow

261. 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

13

18

16

14

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

Remains same

Increases

Decreases

First A and Then B

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

300 m

200 m

11000 m

8000 m

264. 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

265. 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

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

Steady

Unsteady

Irregular

B and C

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

Velocity

Kinetic energy

Total energy

Momentum

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

Zero

Low

High

Constant

269. At high speeds the force is no longer

No proportion

None of these

Proportional

Simply proportional

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