ECAT Physics Fluid Dynamics Chapter Online Test

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Physics

1. 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

Exactly equal

Zero

2. 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

3. 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

14

13

18

16

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

Mass

Energy

None

Momentum

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

None of these

Increases

Decreases rapidly

Decreases

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

Air velocity between the narrow gap increases

Pressure between the narrow gap decreases

Both A and B

None

7. 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 = 30°

None of these

θ = 90°

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

First increases, then decreases

Decreases

Increases

Remains same

9. Internal friction of fluid is called

Surface tension

Cohesive force

Resistance

Viscosity

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

Attractive

Both A and B

Repulsive

None

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

Linear kinetic energy of the body

Force in linear motion

Linear velocity of the body

Mass of the body

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

On the circumference of the circle

Center of the circle

Inside the circle

Outside the circle

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

Density

Solar constant

Surface tension

Compressibility

14. 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 be fall down instantaneously

It will lose its velocity gradually

It still moves with the same velocity

15. Angular momentum is

Axial vector

Scalar

At 45° angle

Polar vector

16. The unit of inductance is equivalent to

Volt x ampere/second

Volt x second/ampere

Ampere/volt x second

Volt/ampere x second

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

Surface tension effect

Viscous force exerted by air

Up thrust of air

Air currents of the earth atmosphere

18. In a uniform circular motion

Speed and acceleration change

Velocity and acceleration remain constant

Kinetic energy remain constant

Only velocity change, acceleration remain constant

19. Numerical value of magnitude of a physical quantity is

Either (B) or (C)

Directly proportional to magnitude of the unit

Independent of system of units

Inversely proportional to magnitude of the unit

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

Change

Both

Constant

None of these

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

0.5 N

N

0.05 N

Zero

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

6 m

7.8 m

22 m

33 m

23. A flowing liquid possesses

K.E.

All

P.E.

Pressure Energy

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

There is no net force

There is no displacement

Force and displacement are perpendicular to each other

The force is always away from the center

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

Equal to weight of liquid displaced

Less than the weight of liquid displaced

Weight of body-weight of liquid displaced

Zero

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

0.03 m/s²

0.20 m/s²

0.027 m/s²

0.218 m/s²

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

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

None of these

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

v/A = constant

None of these

Av = constant

A/v = constant

29. Unite of impulse in

Joule

Kg m/s

Kg m

Newton

30. 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 nm/s

1 mm/s

31. 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 ground on the horse

The horse on the ground

32. 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 larger than molecules in the air

Water molecules are smaller than molecules in the air

Water contains hydrogen atoms, air does not

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

The height of the table

The speed of the particle

The time taken in this work

The actual path taken

34. The term Brownian movement refers to

Irregular motions of small particles suspended in a fluid

Convection currents in a gas but not in a liquid

Convection currents in a liquid or gas

The stretching of a body beyond its elastic limit

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

Maximum

Variable

Zero

Infinite

36. Angular momentum is

Neither A. nor B.

A scalar

Either A. or B.

A vector

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

Cannot be predicted

Are not equal to each other in magnitude

Are equal to each other

Are equal to each other in magnitude

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

None of these

Action of gravity

h₁ – h₂

(h₁ – h₂) and falling under gravity

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

Linear velocity and angular velocity

Mass and angular velocity

Moment of inertia and angular velocity

Centripetal force and radius

40. 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 h¹⁄ ²

Independent of h

Proportional to h²

Proportional to h

41. The atmosphere is held to the earth by

Clouds

The rotation of earth

Gravity

Winds

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

Energy

Mass

Momentum

All

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

2 and 3

3 and 4

4 and 5

1 and 2

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

3 J

4 J

1 J

2 J

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

Linear momentum is constant

Velocity is constant

None of these

It moves in a circular path

46. 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

200

20,000

20

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

0.295 x 10¯³

0.301 x 10¯³

0.198 x 10¯³

0.224 x 10¯³

48. Reason of weightlessness in a satellite is

Zero reaction force by satellite surface

Zero gravity

None of these

Center of mass

49. 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)

9.8 m

14.7 m

19.6 m

4.9 m

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

Linear momentum

Force

None of these

Linear impulse

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

The drive of the car

Friction due to tyres

Force of brakes

Force by steering wheel

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

Fv²

F/v

v/F

Fv

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

Decreases

Zero

Increase

None of these

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

1/R

R

(1/R)²

R²

55. S.I unit of magnetic flux is

Weber per metre

Weber

Weber per metre⁴

Weber metre¯²

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

Momentum

Angular momentum

Mass

Kinetic energy

57. At terminal velocity, fluid friction is

Minimum

Maximum

Zero

None of these

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

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

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

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

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

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

6.12 x 10¯³

6.49 x 10¯³

6.29 x 10¯³

6.18 x 10¯³

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

9.8 N

1 N

Cannot be calculated

4.9 N

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

The kinetic energy changes by mv²

The momentum changes by 2mv

The kinetic energy changes by (1/2)mv²

The momentum changes by mv

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

20 N

4 N

8 N

0 N

63. Wb/m² is equal to

Dynes

Henry

Tesla

Watt

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

22.36 km

22.46 km

20 36 km

25.23 km

65. A jet engine works on the principle of

Conservation of angular momentum

Conservation of linear momentum

Conservation of energy

Conservation of mass

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

A bullet striking a bag of sand

Striking of two glass balls

An electron captured by a proton

A man jumping onto a moving cart

67. The high blood pressure is

100 torr

110 torr

130 torr

120 torr

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

Momentum

Power

Angular momentum

Energy

69. 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

20 ms¯²

1 ms¯²

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

Gravitational force

Centripetal force

All of these

Centrifugal force

71. 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 3 and 4 dyne

More than 3 dynes

Between 1 and 7 dyne

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

Its acceleration is constant

Its moves in straight line

Its kinetic energy is constant

Its velocity is constant

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

Infinite

Minimum

Maximum

Equal to what is in turbulent flow

74. 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

75. Which of the following quantities is a vector

Density

Volume

Temperature

Displacement

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

Density

Weight in the liquid

Weight in air

Weight in water

77. 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

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

Cohesion between the gas molecules and the container

Collision between the gas molecules and the container

Adhesion between the gas molecules and the container

Surface tension of the gas

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

MLT⁰

M⁰L⁰T²

ML⁰T⁰

M⁰LT²

80. 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

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

Unsteady

Irregular

B and C

Steady

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

Their landing velocity will be same

Their maximum height will be same

Their time of flight will be same

Their range will be same

83. 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

1.0 kg wt

0.5 kg wt

Zero

84. The low blood pressure is

75 – 80 torr

70 – 80 torr

78 – 809 torr

79 – 80 torr

85. 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 velocity

Both hit the ground at the same speed

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

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

Both a and b

Magnetic flux

Mass flux

Electric flux

87. 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)

98.0 m/s

39.2 m/s

9.8 m/s

19.6 m/s

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

0.599 x 10¯³

0.594 x 10¯³

0.564 x 10¯³

0.521 x 10¯³

89. 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

90. With the increase of temperature viscosity

Increase

Decrease

Remains same

Doubles

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

1 : 5

2 : 5

5 : 1

1 : 1

92. 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

93. 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

1 m/s

10 m/s

0.01 m/s

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

Work, energy

Pressure, stress

Velocity, speed

Force, impulse

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

Terminal velocity

Initial velocity

Final velocity

Instantaneous velocity

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

Dynamic friction

Rolling friction

Static friction

Limiting friction

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

All of these

Sound heard

High flow speed

Initially turbulent

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

An α particle

A deuteron

An electron

A proton

99. V = √2g(h₁ – h₂) shows the

Torricelli’s theorem

Bernoulli’s theorem

Equation of continuity

None of these

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

Double

Half

4 times

¼ time

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

Very large

Small

None of these

Large

102. Stoke’s law is applicable to

Motion through non-resistive medium

Motion through viscous medium

Motion through horizontal surface

Motion through free space

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

129600

36000

360000

72000

104. 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:

4.9 m/s²

9.8 m/s²

1.96 m/s²

None of these

105. The Systolic blood pressure comes when

Cutting off the blood flow

All of these

None of these

Vessel collapse

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

Twice

Once

Thrice

Four times

107. The unit of focal power of a lens is

Watt

Horse power

Kilo watt

Diopter

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

¼ times

Double

Half

4 times

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

tan¯¹(-P/Q)

sin¯¹(P/Q)

tan¯¹(P/Q)

cos¯¹(-P/Q)

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

π

π/4

π/3

π/2

111. 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

200 m

8000 m

11000 m

300 m

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

None of these

Acceleration

Force

Velocity

113. 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

Not conserved

Conserved

114. The electrical forces are

Both A and B

None

Attractive

Repulsive

115. 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

116. The mass of the block is

30001 b

None of these

21,000 g

3000 g

117. Coefficient of viscosity of honey is greater than

Milk

Petrol

Water

Alcohol

118. Which of the following quantity is dimensionless?

Plank’s constant

Gravitational constant

Power of lens and gas constant

None of these

119. 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

0.98 x 10¯³ Ns

2.5 x 10¯³ Ns

0.15 x 10¯³ Ns

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

Radial

Centrifugal

Centripetal

Tangential

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

Square of the diameter of the body

Size of the body

Diameter of the body

Radius of the body

122. The low blood pressure is known as

Systolic

Diastolic

Low blood pressure

None of these

123. 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

8 m/s

4 m/s

2 m/s

124. Surface area is

Neither scalar nor vector

Vector

Scalar

Both scalar and vector

125. The direction of the angular velocity vector is along

The tangent to the circular path

The axis of rotation

The outward radius

The inward radius

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126. 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.

None of these

60°

120°

90°

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

Perpendicular to each other

Parallel to each other

Antiparallel to each other

Inclined to each other at an angle of 45°

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

First A and Then B

Increases

Decreases

Remains same

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

None of these

Remains unchanged

Decreases

Increases

130. 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

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

None

2 cm

8 cm

1 cm

132. 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

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

Tension in the string always remains the same

T₁ = T₂

T₁ > T₂

T₂ > T₁

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

3 x 10¯¹⁰ J

4.5 x 10¯¹⁹ J

3 x 10¯¹⁹ J

4.5 x 10¯¹⁰ J

135. The blood pressure of the person

Decreases with age

Increases with age

Remains the same

None

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

Moment of inertia increases

Moment of inertia decreases

Angular momentum increases

Angular momentum decreases

137. 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

4 times

Twice

½ of 4 cm diameter pipe

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

½ Mg

Zero

2 Mg

Mg

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

76 cm plus the angle

76 cm minus a function of the angle

Still 76 cm

76 cm minus the angle

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

Does not change

Doubles

Increases

Decreases

141. Angular momentum has the same unit as

Linear momentum x time

Impulse x distance

Power x time

Work x frequency

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

M(g + a)

Mg

M(g – a)

0

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

Law of conservation of energy

All of these

Law of conservation of momentum

Law of conservation of mass

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

The faster one

The slower one

Depends on their mass

Both will reach simultaneously

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

Energy

Linear momentum

Mass

Angular momentum

146. 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?

25 m

50 m

9.8 m

20 m

147. Dot product of two mutual perpendicular vector is:

0

None of these

1

∞

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

Venturi relation

Torricelli’s theorem

Bernoulli’s equation

None of these

149. The concentration of red blood cells in blood is

– 45%

– 40%

~ 30%

~ 50%

150. 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

4 m/s

2 m/s

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151. 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 10⁶ s

2 x 10⁵ s

1 x 10⁶ s

152. 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:

9%

11%

10%

8%

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

By running on the plane

By jumping

By rolling your body on the surface

By spitting or sneezing

154. 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

Truck will cover less distance before rest

Both will cover equal distance

155. 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

0.2 m

0.98 m

0.1 m

Full length of the capillary tube

156. Which of the following is the smallest unit?

Meter

Millimeter

Fermi

Angstrom

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

1 : 2

4 : 1

1 : 1

1 : 4

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

Mass of object

Mass distribution

Angular velocity

Axis of rotation

159. 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

To fall vertically down

To fall at an angle going from east to west

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

160. 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

F/√2

E/2

Zero

161. 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

162. 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

200 m

300 m

400 m

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

Infinite

Zero

Maximum

Minimum

164. 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

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

Constant acceleration (g)

Variable speed

Constant terminal velocity

Variable acceleration

166. 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

v/A = constant

Av = constant

167. The rectangular components of force 5 dyne are

2.5 and 25 dyne

1 and 2 dyne

2 and 3 dyne

3 and 4 dyne

168. Length cannot be measured by

Micron

Fermi

Light year

Debye

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

Kinetic energy

Velocity

Acceleration

Centripetal force

170. 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 sphere

Solid cylinder

171. 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

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

Turbulent

None of these

Mixed

Laminar

173. A flowing liquid possesses

Pressure Energy

K.E.

P.E.

All

174. The Bernoulli’s equation is based on the

Law of conservation of energy

All of these

Law of conservation of momentum

Law of conservation of mass

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

All

Non-ideal fluid

Prefect fluid

Ideal fluid

Page 8 of 11

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

8 times

2 times

6 times

4 times

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

Decreases

Zero

Increases

Remains same

178. 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 no increasing

Go on decreasing

179. Blood has a density

Equal to water

Greater then water

None of these

Lesser then water

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

Thick tar

Honey

All of these

Mobile oil

181. 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

12 N

5 N

2 N

8 N

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

Mg/2

More than mg

Mg

More than 2mg

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

Variable acceleration

Variable speed

Constant terminal velocity

Constant acceleration (g)

184. Pick out the wrong pair:

Pressure-barometer

Sp. gravity-hygrometer

Temperature-thermometer

Charge-coulomb

185. 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

186. 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

187. Velocity of fluid increases where the pressure is

High

Constant

Changes continuously

Low

188. 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 forward direction on bath the wheels

In the backward direction on both the wheels

189. 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

Pt/2m

P²t²/m

190. An instrument called a sphygmomanometer measure

None of these

Milk density

Density of water

Blood pressure

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

Electron-volt

Joule

Calorie

Watt

192. Bernoulli’s equation is applicable for

Turbulent flow

Both laminar and turbulent flow

None of these

Laminar flow

193. 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

Angular acceleration

None of these

Linear acceleration

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

30 N

21 N

60 N

15 N

195. The angular momentum of a body is conserved if

Force acting on it is zero

Torque acting on it is constant

Force acting on it is constant

Torque acting on it is zero

196. A chimney works best when it is

Not tall but wide

Tall

Exposed to air currents

A and B

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

Become zero

Increase

Decrease

Remain unchanged

198. 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

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

The percentage of oxygen in the air increase

The blood pressure increase at high altitudes

The atmospheric pressure decreases there

The density of blood decreases at high altitudes

200. 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:

50°

40°

60°

45°

Page 9 of 11

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

Kinetic energy

Mass

Speed

Momentum

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

Push against the air

Heat up the air which lifts the rocket

React against the rocket and push it up

Push against the earth

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

Turbulent flow

Laminar flow

None of these

Both a and b

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

B . C

B

C

B x C

205. 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

206. 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

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

None of these

1 : 3 : 5

1 : 2 : 3

1 : 4 : 9

208. 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

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

Energy

Momentum

Mass

Fluid

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

In the backward direction on both the wheels

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

In the forward direction on both the wheels

In the forward direction on the rear wheel

211. 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/2

2P

P

212. Drag force is given by

Newton’s law

Pascal’s law

Stokes law

Gauss law

213. 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

17.5 m/s

17 m/s

33 m/s

214. Ball pen functions on the principle of

Viscosity

Gravitational force

Boyle’s law

Surface tension

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

(3/2)R

4R

R

2R

216. Swimming is based on the principle of

Newton’s 2nd law

Newton’s 3rd law

All

Newton’s 1st law

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

4

2

3

1

218. 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

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

When a net external impulse is acting upon the system

When net external force is acting upon the system

When a net eternal torque is acting upon the system

None of these

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

55%

66%

44%

77%

221. At high speeds the force is no longer

Simply proportional

Proportional

No proportion

None of these

222. Venturi relation is used measure

Height of the pipe

Speed of liquid flow

Density of the liquid

Pressure of the liquid

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

Stick to each other

Slide upon each other

Roll upon each other

None of these

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

Remains same

Decreases

Increases

Zero

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

F₁ – 3 N, F₂ – 5N, F₃ = 15 N

F₁ – 3 N, F₂ – 5N, F₃ = 6 N

F₁ – 3 N, F₂ – 5 N, F₃ = 1 N

F₁ – 3 N, F₂ – 5 N, F₃ = 9 N

Page 10 of 11

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

Variable speed and constant velocity

Variable acceleration

Constant acceleration

Constant retardation

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

None of these

Slowly moves in one direction

Moves in different direction

Moves along the same path as

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

Cannot be calculated

1 N

4.9 N

9.8 N

229. 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

Momentum

Total energy

Kinetic energy

230. 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

22 km/s

16.5 km/s

11 km/s

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

Angular momentum

Linear momentum

Energy

Work

232. 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

9 s

3 s

5 s

7 s

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

Initial velocity

Terminal velocity

Instantaneous velocity

Final velocity

234. 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

1.763 x 10² cm³

2 x 10² cm³

None of these

235. Surface tension of water is reduced by adding

Detergents

Both A and B

Camphor

Plastic

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

High

Constant

Low

Zero

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

Ductility

Stiffness

Strength

Elasticity

238. Force of friction is present in

Liquid

Solid

Gases

All of these

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

All of these

Non-viscous

In a steady state

Incompressible

240. Substance which flows easily are

Water

Petrol

All of these

Kerosene oil

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

The density of blood decreases at high altitudes

The blood pressure increase at high altitudes

The percentage of oxygen in the air increase

The atmospheric pressure decreases there

242. 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

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

Become twice its initial value

Remains constant

Become three times, its initial value

Become four times, its initial value

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

Zero

High

Constant

Low

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

Rough

Spherical

Circular

Square

246. Which of the following is true?

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

Neither momentum nor kinetic energy is conserved in inelastic collisions

Momentum is conserved in all collisions but not kinetic energy

247. 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 zero

Is equal to that of B

Is greater than that of B

248. 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°

60°

120°

150°

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

42 km/h

37.5 km/h

40 km/h

10 km/h

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

5 m/s

50 m/s

5 cm/s

50 cm/s

Page 11 of 11

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

Angular momentum and work

Energy and Young’s modulus

Torque and work

Light year and time

252. Identify the pair whose dimensions are equal

Torque and work

Force and work

Stress and energy

Force and stress

253. 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

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

Away from the train

Towards the train

On the train

On himself

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

1.014 x 10¯³

1.012 x 10¯³

1.000 x 10¯³

0.954 x 10¯³

256. 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

1.3

2.3

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

Moving slowly

Moving fast

Moving

Stationary

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

The acceleration of the object is zero

The object can be at rest

The object is moving at constant speed

The object must be at rest

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

Thrice the initial value

Same as the initial value

Twice the initial value

Four times the initial value

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

Magnus effect

Bernoulli’s equation

Surface energy

Equation of continuity

261. The blood vessels are inflated even in

Relaxed states between heart beat

None of these

Occasionally

Working state between heart beat

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

Kinetic energy decreases

Momentum decreases

Momentum increases

Kinetic energy increases

263. 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

264. 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

98 J

968 J

265. 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

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

Flow rate

Volume of fluid

Mass of fluid

Density of fluid

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

1400 m

1200 m

1300 m

1500 m

268. 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

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

0°

60°

120°

90°

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