ECAT Physics Fluid Dynamics Chapter Online Test

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Physics

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

Linear impulse

Force

None of these

Linear momentum

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

17.5 m/s

17 m/s

None of these

33 m/s

3. 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

10,000 N

7,200 N

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

Momentum increases

Kinetic energy increases

Kinetic energy decreases

Momentum decreases

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

Decreases

First A and Then B

Increases

Remains same

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

T₁ > T₂

T₂ > T₁

T₁ = T₂

Tension in the string always remains the same

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

Unity

Unity or less

Unity or more

Less than unity

8. 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

Change in KE is zero

Momentum change is mvr

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

Towards the train

On the train

On himself

Away from the train

10. Swimming is based on the principle of

All

Newton’s 1st law

Newton’s 3rd law

Newton’s 2nd law

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

0°

60°

120°

90°

12. The angular momentum of a body is conserved if

Torque acting on it is zero

Force acting on it is constant

Force acting on it is zero

Torque acting on it is constant

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

B . C

B x C

C

B

14. 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

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

Ductility

Strength

Elasticity

Stiffness

16. 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 velocity is constant

Its kinetic energy is constant

Its moves in straight line

Its acceleration is constant

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

All of these

Centrifugal force

Gravitational force

Centripetal force

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

Twice

Thrice

Four times

Once

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

Somewhat conserved

Conserved

Not conserved

None of these

20. The low blood pressure is known as

Systolic

Low blood pressure

Diastolic

None of these

21. 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 not equal to each other in magnitude

Cannot be predicted

Are equal to each other

22. 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

None

A/v = constant

v/A = constant

23. Angular momentum has the same unit as

Linear momentum x time

Impulse x distance

Work x frequency

Power x time

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

0.198 x 10¯³

0.301 x 10¯³

0.295 x 10¯³

0.224 x 10¯³

25. Which of these statements is not correct?

Moment of inertia does not depend on mass of body

Moment of inertia depends on choice of axes

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

None of these

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

Velocity, speed

Work, energy

Pressure, stress

Force, impulse

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

4 times

Half

Double

¼ times

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

None of these

(h₁ – h₂) and falling under gravity

h₁ – h₂

Action of gravity

29. A man sitting in a bus traveling in a direction from west to east with a speed of 40 km/h observes that the rain-drops are falling vertically down. To the another man standing on ground the rain will appear

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

To fall at an angle going from west to east

To fall at an angle going from east to west

To fall vertically down

30. Numerical value of magnitude of a physical quantity is

Directly proportional to magnitude of the unit

Either (B) or (C)

Inversely proportional to magnitude of the unit

Independent of system of units

31. If vectors P, Q and R have magnitude 5, 12 and 13 units and P + Q = R, the angle between Q and R is

cos¯¹ 7/13

cos¯¹ 5/13

cos¯¹ 5/12

cos¯¹12/13

32. 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

500 gf

300 gf

400 gf

33. The direction of the angular velocity vector is along

The inward radius

The axis of rotation

The outward radius

The tangent to the circular path

34. 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

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

Friction due to tyres

The drive of the car

Force by steering wheel

Force of brakes

36. Wb/m² is equal to

Dynes

Henry

Watt

Tesla

37. 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

Full length of the capillary tube

0.1 m

0.98 m

38. 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 range will be same

Their time of flight will be same

39. Unite of impulse in

Kg m

Newton

Kg m/s

Joule

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

Kinetic energy

Momentum

Angular momentum

Mass

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

21 N

15 N

30 N

60 N

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

Angular momentum decreases

Moment of inertia increases

Moment of inertia decreases

Angular momentum increases

43. 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/2

E

44. Angular momentum is

Axial vector

Scalar

At 45° angle

Polar vector

45. 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

t₁ = 4t₂

t₁ = t₂/2

t₁ = t₂/4

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

None of these

Decreases

Increase

Zero

47. Bernoulli’s equation is applicable for

Laminar flow

Both laminar and turbulent flow

None of these

Turbulent flow

48. Ball pen functions on the principle of

Surface tension

Boyle’s law

Gravitational force

Viscosity

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)

19.6 m

9.8 m

14.7 m

4.9 m

50. The atmosphere is held to the earth by

Gravity

Clouds

Winds

The rotation of earth

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

6.18 x 10¯³

6.49 x 10¯³

6.29 x 10¯³

6.12 x 10¯³

52. 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

200

20

20,000

2000

53. 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

None of these

When a net eternal torque is acting upon the system

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

Antiparallel to each other

Inclined to each other at an angle of 45°

Parallel to each other

Perpendicular to each other

55. 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:

1.96 m/s²

4.9 m/s²

9.8 m/s²

None of these

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

ML⁰T⁰

M⁰LT²

MLT⁰

M⁰L⁰T²

57. A body of mass 1.0 kg is falling with an acceleration of 10 m/s². Its apparent weight will be (g = 10 m/s²)

1.0 kg wt

0.5 kg wt

Zero

2.0 kg wt

58. With the increase of temperature viscosity

Doubles

Remains same

Decrease

Increase

59. 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

Irregular motions of small particles suspended in a fluid

Convection currents in a liquid or gas

60. Reason of weightlessness in a satellite is

Center of mass

Zero reaction force by satellite surface

Zero gravity

None of these

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

R²

(1/R)²

1/R

R

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

The object can be at rest

The object is moving at constant speed

The acceleration of the object is zero

The object must be at rest

63. 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

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

Square of the diameter of the body

Diameter of the body

Size of the body

Radius of the body

65. Blood has a density

None of these

Lesser then water

Greater then water

Equal to water

66. 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?

2 m/s

1 m/s

4 m/s

8 m/s

67. V = √2g(h₁ – h₂) shows the

None of these

Equation of continuity

Torricelli’s theorem

Bernoulli’s theorem

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

Zero

Maximum

Infinite

Variable

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

37.5 km/h

42 km/h

40 km/h

10 km/h

70. Coefficient of viscosity of honey is greater than

Milk

Petrol

Alcohol

Water

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

1.000 x 10¯³

1.012 x 10¯³

0.954 x 10¯³

1.014 x 10¯³

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

Work

Angular momentum

Linear momentum

Energy

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

1 mm/s

1 cm/s

1 μm/s

1 nm/s

74. 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

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

Decrease for both

Increase for liquids and decreases for gases

Decrease for liquids and increase for gases

Increases for both

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76. 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

0 N

4 N

8 N

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

36 km/h

50√2 km/h

80 km/h

40 km/h

78. The electrical forces are

None

Both A and B

Repulsive

Attractive

79. 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 no increasing

Go on decreasing

First increase and then decrease

Remains the same

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

π/4

π

π/3

π/2

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

Constant terminal velocity

Variable speed

Constant acceleration (g)

Variable acceleration

82. 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)

9.8 m/s

19.6 m/s

39.2 m/s

98.0 m/s

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

The actual path taken

The time taken in this work

The speed of the particle

The height of the table

84. A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards?

0.01 m/s

1 m/s

0.1 m/s

10 m/s

85. 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

A/v = constant

Av = constant

86. 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

87. 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

2 ms¯²

10 ms¯²

88. At high speeds the force is no longer

Proportional

None of these

Simply proportional

No proportion

89. 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

None of these

Linear momentum is constant

Velocity is constant

It moves in a circular path

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

Zero

Constant

High

Low

91. 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

92. Stoke’s law is applicable to

Motion through non-resistive medium

Motion through horizontal surface

Motion through free space

Motion through viscous medium

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

Force in linear motion

Mass of the body

Linear kinetic energy of the body

Linear velocity of the body

94. A jet engine works on the principle of

Conservation of angular momentum

Conservation of mass

Conservation of linear momentum

Conservation of energy

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

Electric flux

Mass flux

Both a and b

Magnetic flux

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

The atmospheric pressure decreases there

The density of blood decreases at high altitudes

The percentage of oxygen in the air increase

The blood pressure increase at high altitudes

97. The mass of the block is

21,000 g

30001 b

3000 g

None of these

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

Density of fluid

Volume of fluid

Mass of fluid

Flow rate

99. 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

2 x 10² cm³

1 x 10² cm³

1.763 x 10² cm³

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

Equal both

Solid cylinder

Both

Solid sphere

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

Centripetal

Tangential

Radial

Centrifugal

102. In a uniform circular motion

Only velocity change, acceleration remain constant

Velocity and acceleration remain constant

Speed and acceleration change

Kinetic energy remain constant

103. Dot product of two mutual perpendicular vector is:

None of these

∞

1

0

104. At terminal velocity, fluid friction is

Maximum

None of these

Zero

Minimum

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

None of these

Mixed

Turbulent

Laminar

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

An α particle

A deuteron

A proton

An electron

107. 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

Linear acceleration

None of these

Angular acceleration

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

7.8 m

33 m

6 m

22 m

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

Both A and B

Air velocity between the narrow gap increases

None

Pressure between the narrow gap decreases

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

Bernoulli’s equation

Surface energy

Magnus effect

Equation of continuity

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

Between 1 and 7 dyne

More than 4 dynes

Between 3 and 4 dyne

More than 3 dynes

112. 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 kinetic energy changes by (1/2)mv²

The momentum changes by mv

The momentum changes by 2mv

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

Repulsive

Both A and B

Attractive

None

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

Avoid wastage of water

Increase the mass of water flowing per second

Increase the volume to water flowing out

Increase the volume to water flowing per second

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

None of these

968 J

1980 J

98 J

116. Surface tension of water is reduced by adding

Plastic

Both A and B

Detergents

Camphor

117. Velocity of fluid increases where the pressure is

Low

High

Changes continuously

Constant

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

Linear momentum

Mass

Angular momentum

Energy

119. 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

120°

60°

90°

120. A chimney works best when it is

Not tall but wide

A and B

Exposed to air currents

Tall

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

Surface tension

Density

Compressibility

Solar constant

122. The blood pressure of the person

Decreases with age

Remains the same

Increases with age

None

123. Drag force is given by

Pascal’s law

Newton’s law

Gauss law

Stokes law

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

By spitting or sneezing

By rolling your body on the surface

By jumping

By running on the plane

125. 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%

10%

9%

11%

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126. 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:

2 : 5

5 : 1

1 : 5

1 : 1

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

76 cm minus a function of the angle

76 cm plus the angle

76 cm minus the angle

Still 76 cm

128. 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

16

18

13

129. 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 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

130. 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

4 : 1

1 : 1

1 : 2

131. 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

132. The unit of focal power of a lens is

Horse power

Watt

Kilo watt

Diopter

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

6 times

8 times

4 times

2 times

134. Identify the pair whose dimensions are equal

Force and stress

Stress and energy

Torque and work

Force and work

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

44%

77%

66%

55%

136. Which of the following is true?

Momentum is conserved in all collisions but not kinetic energy

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 kinetic energy is conserved only in inelastic collisions

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

Watt

Electron-volt

Joule

Calorie

138. When fluid is incompressible then

Density of the fluid is constant

Velocity of the fluid is constant

Flow of the fluid is straight line

Volume of the fluid is constant

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

It will lose its velocity gradually

It will be just floating at the same point in space

It still moves with the same velocity

It will be fall down instantaneously

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

More than mg

Mg

Mg/2

More than 2mg

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

Terminal velocity

Initial velocity

Instantaneous velocity

Final velocity

142. The acceleration of a motor car is 8 m/s². If the diameter of its wheel be 2 meter, its angular acceleration will be

8 radian/s²

16 m/s²

16 radian/s²

8 m/s²

143. 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

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

Increase the velocity of water flowing out

Increase the volume of water flowing per second

Avoid wastage of water

Increase the mass of water flowing per second

145. Angular momentum is

A scalar

Neither A. nor B.

Either A. or B.

A vector

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

Kinetic energy

Mass

Momentum

Speed

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

0.564 x 10¯³

0.599 x 10¯³

0.594 x 10¯³

0.521 x 10¯³

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

Force and displacement are perpendicular to each other

The force is always away from the center

There is no net force

There is no displacement

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

5 s

9 s

7 s

3 s

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

Constant retardation

Variable acceleration

Variable speed and constant velocity

Constant acceleration

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151. 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

Pt/2m

P²t²/3m

P²t²/m

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

Energy and Young’s modulus

Light year and time

Angular momentum and work

Torque and work

153. Substance which flows easily are

All of these

Kerosene oil

Water

Petrol

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

2R

4R

(3/2)R

R

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

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

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

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

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

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

Final velocity

Terminal velocity

Instantaneous velocity

Initial velocity

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

Minimum

Maximum

Zero

Infinite

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

Angular velocity

Mass distribution

Mass of object

Axis of rotation

159. 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

1 cm

2 cm

None

160. An instrument called a sphygmomanometer measure

Density of water

Blood pressure

None of these

Milk density

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

Light object

Both have the same momentum

Heavy object

Data is not sufficient

162. The high blood pressure is

100 torr

120 torr

110 torr

130 torr

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

Less than the weight of liquid displaced

Zero

Weight of body-weight of liquid displaced

Equal to weight of liquid displaced

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

360000

129600

72000

36000

165. 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

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

Its acceleration is also doubled

Its kinetic energy is also doubled

Its momentum is also doubled

Its potential energy is also doubled

167. 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

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

Half

¼ time

4 times

Double

169. Pick out the wrong pair:

Temperature-thermometer

Pressure-barometer

Charge-coulomb

Sp. gravity-hygrometer

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

M(g + a)

0

Mg

M(g – a)

171. The blood vessels are inflated even in

Relaxed states between heart beat

Working state between heart beat

None of these

Occasionally

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

Acceleration

Centripetal force

Kinetic energy

Velocity

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

1 : 1

2 : 1

1 : 3

3 : 1

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

Surface tension effect

Up thrust of air

Air currents of the earth atmosphere

Viscous force exerted by air

175. 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°

60°

40°

50°

Page 8 of 11

176. If an object weighs 90 N in air, 60 N in water, and 20 N in an unknown liquid in which it does not dissolve, the so. Gr. Of the unknown liquid is

1.5

2.3

1.3

3.0

177. 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

178. A flowing liquid possesses

Pressure Energy

K.E.

All

P.E.

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

The ground on the cart

The horse on the ground

The ground on the horse

The horse on the cart

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

Four times the initial value

Thrice the initial value

Twice the initial value

Same as the initial value

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

Increase

Become zero

Decrease

Remain unchanged

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

Stick to each other

None of these

Slide upon each other

Roll upon each other

183. 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

W

2W

W/2

184. Internal friction of fluid is called

Viscosity

Resistance

Cohesive force

Surface tension

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

Remains same

Increases

Zero

Decreases

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

Honey

All of these

Mobile oil

Thick tar

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

Energy

All

Mass

Momentum

188. 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 cm/s

5 m/s

189. Force of friction is present in

Gases

All of these

Solid

Liquid

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

Constant terminal velocity

Variable speed

Constant acceleration (g)

Variable acceleration

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

Unsteady

Irregular

Steady

B and C

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

Become four times, its initial value

Become twice its initial value

Remains constant

Become three times, its initial value

193. Which of the following is the smallest unit?

Meter

Angstrom

Fermi

Millimeter

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

Remains same

Decreases

Increases

First increases, then decreases

195. 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

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

Mg

Zero

½ Mg

2 Mg

197. The low blood pressure is

70 – 80 torr

78 – 809 torr

75 – 80 torr

79 – 80 torr

198. 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 molecules are larger than molecules in the air

Water molecules are smaller than molecules in the air

Surface tension of the water prevents it from

Water contains hydrogen atoms, air does not

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

Momentum

Energy

None

Mass

200. 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

Page 9 of 11

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

Weight in the liquid

Weight in water

Density

Weight in air

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

Moving slowly

Stationary

Moving

Moving fast

203. A flowing liquid possesses

P.E.

All

Pressure Energy

K.E.

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

Decreases

Remains same

Zero

Increases

205. 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

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

Decreases rapidly

None of these

Increases

Decreases

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

None of these

Small

Large

Very large

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

In the backward direction on both the wheels

In the forward 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 the rear wheel

209. 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

210. 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:

11 km/s

16.5 km/s

22 km/s

5.5 km/s

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

Remains unchanged

Increases

None of these

Decreases

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

Non-ideal fluid

Prefect fluid

Ideal fluid

All

213. 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

P/2

2P

P/4

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

3

4

1

2

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

Law of conservation of momentum

All of these

Law of conservation of mass

Law of conservation of energy

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

Is zero

Is equal to that of B

Is greater than that of B

Is smaller than that of B

217. Two forces of magnitude 7 N and 5 N act on a particle at an angle θ to each other, θ can have any value. The minimum magnitude of the resultant force is

5 N

2 N

8 N

12 N

218. The Systolic blood pressure comes when

None of these

Vessel collapse

All of these

Cutting off the blood flow

219. The rectangular components of force 5 dyne are

2 and 3 dyne

3 and 4 dyne

2.5 and 25 dyne

1 and 2 dyne

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

Rough

Spherical

Square

Circular

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

Low

High

Constant

Zero

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

None of these

1 : 4 : 9

1 : 3 : 5

1 : 2 : 3

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

2 m/s

4 m/s

1 m/s

None of these

224. 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

0.98 x 10¯³ Ns

0.15 x 10¯³ Ns

2.5 x 10¯³ Ns

1.5 x 10¯³ Ns

225. 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

300 m

8000 m

11000 m

Page 10 of 11

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

None of these

Torricelli’s theorem

Venturi relation

Bernoulli’s equation

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

None of these

Constant

Change

Both

228. The concentration of red blood cells in blood is

~ 50%

– 45%

– 40%

~ 30%

229. Which of the following quantities is a vector

Temperature

Volume

Displacement

Density

230. 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 air

Push against the earth

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

tan¯¹(-P/Q)

tan¯¹(P/Q)

sin¯¹(P/Q)

cos¯¹(-P/Q)

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

3 x 10¯¹⁰ J

3 x 10¯¹⁹ J

4.5 x 10¯¹⁰ J

4.5 x 10¯¹⁹ J

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

They are always at the same point

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

None of these

Center of mass changes but center of gravity is always same

234. 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

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

350 J

3430 J

100 J

5 J

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

Depends on their mass

Both will reach simultaneously

The faster one

The slower one

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

Twice

4 times

¼ times

½ of 4 cm diameter pipe

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

1 J

3 J

2 J

4 J

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

Non-viscous

All of these

In a steady state

Incompressible

240. 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

241. The unit of inductance is equivalent to

Volt x second/ampere

Ampere/volt x second

Volt/ampere x second

Volt x ampere/second

242. 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

243. In a uniform circular motion (horizontal) of a ball tied with a string, velocity at any time is at any angle θ with acceleration, then θ is

θ = 90°

θ = 30°

None of these

θ = 60°

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

Momentum

Energy

Angular momentum

Power

245. 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

N

Zero

246. Which of the following quantity is dimensionless?

None of these

Gravitational constant

Plank’s constant

Power of lens and gas constant

247. 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

10 N, 8 N

12 N, 6 N

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

Limiting friction

Rolling friction

Dynamic friction

Static friction

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

0.064 m

64 m

64 cm

640 cm

250. 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

Page 11 of 11

251. 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

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

Fv²

v/F

Fv

F/v

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

Acceleration

None of these

Velocity

Force

254. A body of mass 5 kg is moving with a momentum of 10 kg m/s. A force of 0.2 N acts on it in the direction of motion of the body for 10 seconds. The increase in its kinetic energy is

4.4 joule

3.2 joule

2.8 joule

3.8 joule

255. S.I unit of magnetic flux is

Weber

Weber per metre⁴

Weber per metre

Weber metre¯²

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

Centripetal force and radius

Linear velocity and angular velocity

Mass and angular velocity

Moment of inertia and angular velocity

257. 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

60°

120°

150°

90°

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

Cohesion between the gas molecules and the container

Adhesion between the gas molecules and the container

Surface tension of the gas

Collision between the gas molecules and the container

259. Surface area is

Both scalar and vector

Neither scalar nor vector

Vector

Scalar

260. Length cannot be measured by

Fermi

Debye

Micron

Light year

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

Both a and b

Laminar flow

None of these

Turbulent flow

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

4 and 5

3 and 4

2 and 3

1 and 2

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

Infinite

Minimum

Maximum

Equal to what is in turbulent flow

264. Venturi relation is used measure

Height of the pipe

Pressure of the liquid

Density of the liquid

Speed of liquid flow

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

Energy

Fluid

Momentum

Mass

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

Doubles

Increases

Does not change

Decreases

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

Total energy

Kinetic energy

Momentum

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

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

0.20 m/s²

0.03 m/s²

0.218 m/s²

0.027 m/s²

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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