ECAT Physics Fluid Dynamics Chapter Online Test

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Physics

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

50 cm/s

50 m/s

5 m/s

5 cm/s

2. 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

4 m/s

2 m/s

1 m/s

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

First A and Then B

Increases

Remains same

Decreases

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

Slowly moves in one direction

Moves along the same path as

Moves in different direction

None of these

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

Initially turbulent

Sound heard

All of these

High flow speed

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

60°

120°

90°

None of these

7. 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

11000 m

200 m

300 m

8. 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

P²t²/2m

P²t²/3m

Pt/2m

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

50√2 km/h

36 km/h

80 km/h

40 km/h

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

Irregular

Unsteady

B and C

Steady

11. The concentration of red blood cells in blood is

~ 30%

~ 50%

– 40%

– 45%

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

The speed of the particle

The time taken in this work

The height of the table

The actual path taken

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

Stationary

Moving fast

Moving slowly

Moving

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

1 : 3 : 5

1 : 2 : 3

None of these

1 : 4 : 9

15. Internal friction of fluid is called

Surface tension

Resistance

Cohesive force

Viscosity

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

Unity or less

Less than unity

Unity

Unity or more

17. 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

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

Become zero

Decrease

Increase

Remain unchanged

19. 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

20. Venturi relation is used measure

Pressure of the liquid

Density of the liquid

Speed of liquid flow

Height of the pipe

21. Two water pipes of diameters 2 cm and 4 cm are connected with main supply line. The velocity of flow of water in the pipe 2 cm diameter is

¼ times

½ of 4 cm diameter pipe

4 times

Twice

22. Two force are such that then sum of their magnitudes is 18 N and their resultant is perpendicular to the smaller forces and the magnitude of resultant is 12. Then the magnitude of the forces are.

12 N, 6 N

13 N, 5 N

10 N, 8 N

16 N, 2 N

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

Doubles

Increases

Does not change

Decreases

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

Increases

Remains same

Decreases

Zero

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

968 J

1980 J

None of these

98 J

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26. Which of the following is the smallest unit?

Fermi

Angstrom

Millimeter

Meter

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

All of these

Centripetal force

Centrifugal force

Gravitational force

28. A 50 kg man with 20 kg load on his head climbs up 20 steps of 0.25 m height each. The work done in climbing is

5 J

100 J

3430 J

350 J

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

More than 4 dynes

Between 1 and 7 dyne

Between 3 and 4 dyne

More than 3 dynes

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

None of these

Change

Constant

Both

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

Minimum

Equal to what is in turbulent flow

Maximum

Infinite

32. Length cannot be measured by

Light year

Micron

Debye

Fermi

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

Pressure between the narrow gap decreases

None

Air velocity between the narrow gap increases

Both A and B

34. 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

0 N

20 N

8 N

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

All of these

Mobile oil

Thick tar

Honey

36. 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

The faster one

The slower one

Depends on their mass

37. Which of the following quantities is a vector

Density

Displacement

Volume

Temperature

38. 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

39. A train is moving with a velocity of 25 m/s and a car is moving behind it by a velocity of 8 m/s in same direction. The relative velocity of train with respect to car is

17.5 m/s

33 m/s

None of these

17 m/s

40. 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

Av = constant

v/A = constant

A/v = constant

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

A proton

An electron

An α particle

A deuteron

42. Wb/m² is equal to

Tesla

Henry

Watt

Dynes

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

Linear kinetic energy of the body

Mass of the body

Force in linear motion

Linear velocity of the body

44. Force of friction is present in

Solid

All of these

Liquid

Gases

45. 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

3.8 joule

3.2 joule

2.8 joule

4.4 joule

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

M⁰LT²

ML⁰T⁰

M⁰L⁰T²

MLT⁰

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

Density of fluid

Flow rate

Volume of fluid

Mass of fluid

48. 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

8 radian/s²

16 m/s²

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

Momentum

Mass

Fluid

Energy

50. Which of the following quantity is dimensionless?

None of these

Power of lens and gas constant

Plank’s constant

Gravitational constant

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51. V = √2g(h₁ – h₂) shows the

None of these

Torricelli’s theorem

Bernoulli’s theorem

Equation of continuity

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

Inside the circle

Center of the circle

On the circumference of the circle

Outside the circle

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

Equation of continuity

Surface energy

Magnus effect

Bernoulli’s equation

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

Linear momentum

None of these

Force

Linear impulse

55. The low blood pressure is

78 – 809 torr

79 – 80 torr

75 – 80 torr

70 – 80 torr

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

Both

Equal both

Solid sphere

Solid cylinder

57. 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

Surface tension of the water prevents it from

Water molecules are larger than molecules in the air

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

Work

Angular momentum

Linear momentum

Energy

59. 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

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

Constant retardation

Constant acceleration

Variable acceleration

Variable speed and constant velocity

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

Are not equal to each other in magnitude

Are equal to each other in magnitude

Cannot be predicted

Are equal to each other

62. Bernoulli’s equation is applicable for

Both laminar and turbulent flow

Laminar flow

Turbulent flow

None of these

63. A body falls freely from rest. It covers as much distance in the last second of its motion as covered in the first three seconds. The body has fallen for a time of

7 s

9 s

3 s

5 s

64. 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

Moment of inertia depends on choice of axes

None of these

65. 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

2.3

1.5

1.3

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

Size of the body

Diameter of the body

Radius of the body

Square of the diameter of the body

67. 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

0.01 m/s

10 m/s

0.1 m/s

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

0.224 x 10¯³

0.295 x 10¯³

0.198 x 10¯³

0.301 x 10¯³

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

Collision between the gas molecules and the container

Adhesion between the gas molecules and the container

Surface tension of the gas

Cohesion between the gas molecules and the container

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

Stiffness

Strength

Ductility

Elasticity

71. 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 5/12

cos¯¹ 5/13

72. A flowing liquid possesses

All

Pressure Energy

P.E.

K.E.

73. 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

Become four times, its initial value

Remains constant

74. 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

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

First increases, then decreases

Remains same

Increases

Decreases

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

Both A and B

Attractive

None

Repulsive

77. 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

Zero

2W

W

W/2

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

None of these

Decreases rapidly

Decreases

Increases

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

They are always at the same point

None of these

Center of mass changes but center of gravity is always same

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

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

All of these

Non-viscous

In a steady state

Incompressible

81. 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

0.5 N

Zero

0.05 N

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

T₂ > T₁

T₁ > T₂

T₁ = T₂

Tension in the string always remains the same

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

The ball had covered exactly half the distance

The 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 less than half the distance

84. 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

72000

360000

36000

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

Parallel to each other

Perpendicular to each other

Antiparallel to each other

Inclined to each other at an angle of 45°

86. Ball pen functions on the principle of

Viscosity

Surface tension

Boyle’s law

Gravitational force

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

None of these

When a net external impulse is acting upon the system

When a net eternal torque is acting upon the system

When net external force is acting upon the system

88. 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

Mg

2 Mg

89. 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

90. In a container having water filled up to a height h, a hole is made in the bottom. The velocity of water flowing out of the hole is

Proportional to h

Proportional to h¹⁄ ²

Proportional to h²

Independent of h

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

Increase the mass of water flowing per second

Increase the volume of water flowing per second

Avoid wastage of water

Increase the velocity of water flowing out

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

1 m/s

4 m/s

None of these

2 m/s

93. In a uniform circular motion

Kinetic energy remain constant

Only velocity change, acceleration remain constant

Speed and acceleration change

Velocity and acceleration remain constant

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

Both will cover equal distance

Truck will cover less distance before rest

None of these

Car will cover less distance before rest

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

Constant terminal velocity

Variable speed

Variable acceleration

Constant acceleration (g)

96. The blood vessels are inflated even in

Relaxed states between heart beat

Occasionally

Working state between heart beat

None of these

97. A ball is dropped from a certain height and another ball is projected horizontally from the same point. Which of the following statements is correct?

Both hit the ground at the same speed

Both hit the ground at the same velocity

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

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

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

0.954 x 10¯³

1.014 x 10¯³

1.012 x 10¯³

1.000 x 10¯³

99. 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

100. 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

9.8 m

20 m

25 m

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101. Swimming is based on the principle of

Newton’s 3rd law

Newton’s 1st law

Newton’s 2nd law

All

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

60 N

30 N

21 N

15 N

103. 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

104. 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

None of these

Velocity is constant

Linear momentum is constant

105. 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

106. Dot product of two mutual perpendicular vector is:

∞

None of these

0

1

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

Viscous force exerted by air

Air currents of the earth atmosphere

Up thrust of air

Surface tension effect

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

Cannot be calculated

1 N

9.8 N

4.9 N

109. 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

Four times the initial value

Twice the initial value

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

It still moves with the same velocity

It will be just floating at the same point in space

It will lose its velocity gradually

It will be fall down instantaneously

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

Increases

None of these

Decreases

Remains unchanged

112. A flowing liquid possesses

Pressure Energy

P.E.

K.E.

All

113. 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

20,000

2000

200

20

114. 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

1500 m

1200 m

1300 m

115. S.I unit of magnetic flux is

Weber per metre⁴

Weber

Weber per metre

Weber metre¯²

116. The angular momentum of a body is conserved if

Torque acting on it is constant

Force acting on it is zero

Force acting on it is constant

Torque acting on it is zero

117. Surface tension of water is reduced by adding

Plastic

Both A and B

Detergents

Camphor

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

Joule

Electron-volt

Calorie

Watt

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

Terminal velocity

Final velocity

Initial velocity

Instantaneous velocity

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

20 ms¯²

1 ms¯²

10 ms¯²

2 ms¯²

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

Tangential

Centripetal

Radial

Centrifugal

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

Infinite

Zero

Variable

Maximum

123. Angular momentum is

Polar vector

At 45° angle

Scalar

Axial vector

124. 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

100,000 N

3,600 N

7,200 N

10,000 N

125. Blood has a density

Equal to water

None of these

Lesser then water

Greater then water

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126. 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

8 cm

2 cm

None

1 cm

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

Variable speed

Variable acceleration

Constant terminal velocity

Constant acceleration (g)

128. The low blood pressure is known as

Systolic

Diastolic

None of these

Low blood pressure

129. 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 ½ mv²

Change in KE is zero

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

Limiting friction

Static friction

Rolling friction

Dynamic friction

131. The atmosphere is held to the earth by

The rotation of earth

Gravity

Clouds

Winds

132. 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

133. 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

P/2

2P

134. An instrument called a sphygmomanometer measure

None of these

Milk density

Blood pressure

Density of water

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

Zero

Remains same

Decreases

Increases

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

(h₁ – h₂) and falling under gravity

h₁ – h₂

Action of gravity

None of these

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

Rough

Circular

Square

Spherical

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

500 gf

700 gf

300 gf

400 gf

139. 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

F/√2

Zero

E/2

E

140. 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

141. 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¯¹⁰ J

3 x 10¯¹⁹ J

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

Kinetic energy

Mass

Momentum

Speed

143. 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

None of these

θ = 30°

θ = 90°

θ = 60°

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

Laminar flow

None of these

Both a and b

Turbulent flow

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

1 nm/s

1 mm/s

1 cm/s

1 μm/s

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

0°

60°

120°

90°

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

148. Velocity of fluid increases where the pressure is

High

Low

Constant

Changes continuously

149. Pick out the wrong pair:

Charge-coulomb

Temperature-thermometer

Pressure-barometer

Sp. gravity-hygrometer

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

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

In the forward direction on the rear wheel

In the backward direction on both the wheels

In the forward direction on both the wheels

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

Its potential energy is also doubled

Its momentum is also doubled

Its kinetic energy is also doubled

Its acceleration is also doubled

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

Stick to each other

Roll upon each other

Slide upon each other

None of these

153. 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

To fall at an angle going from west to east

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

To fall vertically down

154. 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

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

Zero

High

Low

Constant

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

Moment of inertia and angular velocity

Mass and angular velocity

Centripetal force and radius

Linear velocity and angular velocity

157. 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

19.6 m/s

9.8 m/s

39.2 m/s

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

640 cm

64 cm

0.064 m

64 m

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

Force by steering wheel

Force of brakes

The drive of the car

Friction due to tyres

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

1 : 4

1 : 2

1 : 1

4 : 1

161. The Systolic blood pressure comes when

All of these

Vessel collapse

None of these

Cutting off the blood flow

162. 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

2 x 10² cm³

1 x 10² cm³

None of these

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

Mass flux

Magnetic flux

Electric flux

Both a and b

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 = t₂/2

t₁ = t₂

t₁ = 4t₂

t₁ = t₂/4

165. 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

Linear acceleration

None of these

166. Identify the pair whose dimensions are equal

Force and work

Torque and work

Stress and energy

Force and stress

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

Mass

Energy

Momentum

All

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

22 km/s

5.5 km/s

16.5 km/s

11 km/s

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

All

Ideal fluid

Prefect fluid

Non-ideal fluid

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

The atmospheric pressure decreases there

The percentage of oxygen in the air increase

The density of blood decreases at high altitudes

The blood pressure increase at high altitudes

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

Law of conservation of energy

Law of conservation of momentum

All of these

Law of conservation of mass

172. The unit of focal power of a lens is

Diopter

Horse power

Kilo watt

Watt

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

Momentum decreases

Kinetic energy decreases

Momentum increases

Kinetic energy increases

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

None of these

Av = constant

v/A = constant

A/v = constant

175. 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

Page 8 of 11

176. The term Brownian movement refers to

Convection currents in a liquid or gas

Irregular motions of small particles suspended in a fluid

Convection currents in a gas but not in a liquid

The stretching of a body beyond its elastic limit

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

(3/2)R

2R

4R

R

178. The mass of the block is

30001 b

3000 g

21,000 g

None of these

179. 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 bath the wheels

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

180. 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

Momentum

Kinetic energy

Velocity

Total energy

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

Kinetic energy

Momentum

Angular momentum

Mass

182. At terminal velocity, fluid friction is

Minimum

Maximum

None of these

Zero

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

Heat up the air which lifts the rocket

React against the rocket and push it up

Push against the earth

Push against the air

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

0.599 x 10¯³

0.564 x 10¯³

0.521 x 10¯³

0.594 x 10¯³

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

Decrease for both

Increases for both

Increase for liquids and decreases for gases

Decrease for liquids and increase for gases

186. 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

None of these

1.96 m/s²

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

Very large

None of these

Large

Small

188. Unite of impulse in

Kg m/s

Joule

Newton

Kg m

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

3 and 4

4 and 5

1 and 2

2 and 3

190. The high blood pressure is

120 torr

110 torr

100 torr

130 torr

191. 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

4.9 m

19.6 m

14.7 m

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

4

2

1

3

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

0.218 m/s²

0.03 m/s²

0.027 m/s²

0.20 m/s²

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

Angular momentum

Energy

Momentum

Power

195. 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 decreases

Angular momentum increases

196. 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

14

13

18

197. 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

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

F₁ – 3 N, F₂ – 5 N, F₃ = 9 N

F₁ – 3 N, F₂ – 5 N, F₃ = 1 N

F₁ – 3 N, F₂ – 5N, F₃ = 6 N

F₁ – 3 N, F₂ – 5N, F₃ = 15 N

199. 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

200. 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)

tan¯¹(-P/Q)

cos¯¹(-P/Q)

Page 9 of 11

201. 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

33 m

22 m

7.8 m

202. 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

Roughly equal

Zero

Unequal

Exactly equal

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

High

Low

Zero

Constant

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

Maximum

Infinite

Minimum

Zero

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

2 times

4 times

6 times

8 times

206. Substance which flows easily are

Petrol

All of these

Kerosene oil

Water

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

More than mg

Mg/2

Mg

More than 2mg

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

Turbulent

Mixed

Laminar

None of these

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

6.49 x 10¯³

6.12 x 10¯³

6.18 x 10¯³

6.29 x 10¯³

210. A jet engine works on the principle of

Conservation of mass

Conservation of angular momentum

Conservation of energy

Conservation of linear momentum

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

1 J

4 J

3 J

2 J

212. 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

213. 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°

214. Water is filled up to a height ‘H’ in a tank. A hole is made at depth ‘H’ below the water level. The velocity of efflux of the fluid is.

.gh

2gh

√2gh

√gh

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

Increase

Zero

Decreases

None of these

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

Linear momentum

Angular momentum

Mass

Energy

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

¼ times

4 times

Half

Double

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

Torque and work

Light year and time

Energy and Young’s modulus

Angular momentum and work

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

77%

66%

55%

44%

220. Reason of weightlessness in a satellite is

Zero gravity

Zero reaction force by satellite surface

Center of mass

None of these

221. 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%

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

π/3

π

π/4

π/2

223. Coefficient of viscosity of honey is greater than

Milk

Water

Petrol

Alcohol

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

Its kinetic energy is constant

Its acceleration is constant

Its velocity is constant

Its moves in straight line

225. Surface area is

Vector

Scalar

Both scalar and vector

Neither scalar nor vector

Page 10 of 11

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

Energy

Momentum

Mass

None

227. 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 per second

Increase the volume to water flowing out

Increase the mass of water flowing per second

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

Centripetal force

Acceleration

Velocity

Kinetic energy

229. 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

Full length of the capillary tube

0.1 m

230. At high speeds the force is no longer

Simply proportional

Proportional

None of these

No proportion

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

Fv²

F/v

v/F

Fv

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

Mass of object

Angular velocity

Axis of rotation

Mass distribution

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

Weight in air

Weight in water

Weight in the liquid

Density

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

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

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

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

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

235. Angular momentum has the same unit as

Linear momentum x time

Work x frequency

Power x time

Impulse x distance

236. The unit of inductance is equivalent to

Volt x second/ampere

Volt/ampere x second

Ampere/volt x second

Volt x ampere/second

237. With the increase of temperature viscosity

Increase

Remains same

Doubles

Decrease

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

Double

4 times

¼ time

Half

239. A chimney works best when it is

Not tall but wide

Tall

Exposed to air currents

A and B

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

Venturi relation

None of these

Torricelli’s theorem

Bernoulli’s equation

241. The rectangular components of force 5 dyne are

2 and 3 dyne

2.5 and 25 dyne

3 and 4 dyne

1 and 2 dyne

242. Numerical value of magnitude of a physical quantity is

Inversely proportional to magnitude of the unit

Independent of system of units

Directly proportional to magnitude of the unit

Either (B) or (C)

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

R²

R

(1/R)²

1/R

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

Final velocity

Initial velocity

Instantaneous velocity

Terminal velocity

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

Density

Surface tension

Solar constant

Compressibility

246. Drag force is given by

Newton’s law

Pascal’s law

Gauss law

Stokes law

247. 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

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

Data is not sufficient

Heavy object

Light object

Both have the same momentum

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

76 cm plus the angle

Still 76 cm

76 cm minus a function of the angle

76 cm minus the angle

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

Striking of two glass balls

An electron captured by a proton

A bullet striking a bag of sand

A man jumping onto a moving cart

Page 11 of 11

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

There is no net force

Force and displacement are perpendicular to each other

There is no displacement

The force is always away from the center

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

0

M(g – a)

M(g + a)

Mg

253. 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

37.5 km/h

42 km/h

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

4.9 N

9.8 N

Cannot be calculated

1 N

255. 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

5 : 1

2 : 5

1 : 1

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

Work, energy

Pressure, stress

Force, impulse

Velocity, speed

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

Less than the weight of liquid displaced

Weight of body-weight of liquid displaced

Zero

Equal to weight of liquid displaced

258. Which of the following is true?

Neither momentum nor kinetic energy is conserved in inelastic collisions

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

Both momentum and kinetic energy are conserved in all collisions

Momentum is conserved in all collisions but not kinetic energy

259. The blood pressure of the person

Increases with age

Remains the same

Decreases with age

None

260. 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

Zero

2.0 kg wt

261. 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 greater than that of B

Is zero

Is equal to that of B

262. 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°

263. The electrical forces are

Both A and B

Attractive

Repulsive

None

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

Acceleration

Force

Velocity

None of these

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

Towards the train

Away from the train

On himself

On the train

266. Stoke’s law is applicable to

Motion through viscous medium

Motion through horizontal surface

Motion through free space

Motion through non-resistive medium

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

B

B . C

B x C

C

268. Angular momentum is

Either A. or B.

A scalar

Neither A. nor B.

A vector

269. 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 rolling your body on the surface

By jumping

By spitting or sneezing

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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