Generate Quiz 6A94510F85204

1 / 30

A body having translatory motion possesses _____ and _____. In the same way a body having rotatory motion possesses _______ and _______.

Elimination Tool

A) Angular momentum… Angular velocity…. Linear momentum….Linear velocity

B) Linear velocity…Linear momentum…. Angular velocity…. Angular momentum

C) Linear momentum…. Angular momentum…… Linear velocity…. Angular velocity

D) Angular velocity…. Angular momentum….. Linear momentum….. Linear velocity

2 / 30

If during circular motion, tangential velocity of a body becomes double, then centripetal force becomes:

Elimination Tool
Hints

A) Double

B) One half

C) Four times

D) One fourth

3 / 30

What is angular velocity?

Elimination Tool

A) Change in angular rotation / change in time

B) Change in displacement / change in time

C) Change in speed / change in time

D) Change in acceleration / change in time

4 / 30

The centripetal acceleration formula is given as:

Elimination Tool

A) V/r

B) r/V

C) ma

D) None of these options are correct

5 / 30

Which of the following gives the relationship between linear velocity and angular velocity?

Elimination Tool

A) v = rω

B) v = rθ

C) v=sω

D) v=sθ

6 / 30

A car going around a certain curve at a speed of 25 km/h has a centripetal force acting on it of 100 N. If the speed of the car is doubled, the centripetal force:

Elimination Tool

A) Is quadrupled

B) Is doubled

C) Is multiplied by the√2

D) Is reduced to ½ of the original value

7 / 30

A body moves on a circular path subtending an angle of 2 radians at the center of a circle of radius 3.5 meters. The linear displacement of the body is _________.

Elimination Tool

A) 6.5 m

B) 7.0 m

C) 7.5 m

D) 1.75 m

8 / 30

The earth rotates on its axis once a day. Suppose, by some process the earth contracts so that it’s radius is only half as large as at present, then how long the earth will take to complete it’s rotation?

Elimination Tool

A) 24 hours

B) 18 hours

C) 6 hours

D) 12 hours

9 / 30

The angular measurement is known as _____ measurement

Elimination Tool

A) parameter

B) area

C) circumference

D) all of these

10 / 30

A car going around a certain curve at a speed of 25 km/h has a centripetal force acting on it of 100 N. If the speed of the car is doubled, the centripetal force:

Elimination Tool

A) Is quadrupled

B) Is doubled

C) Is multiplied by the√2

D) Is reduced to ½ of the original value

11 / 30

A particle moves in a circle of radius r under the action of a centripetal force equal to -k/r2 , where k is a constant. The total energy of the particle is:

Question

Elimination Tool
Option

Option

A) Option A

B) Option B

C) Option C

D) Option D

12 / 30

The moment of inertia of a solid sphere of mass ‘m’ having radius ‘r’ about a line passing through its center is:

Elimination Tool

A) 5/2 mr2

B) 2/5 mr2

C) 1/2 mr2

D) 1/3 mr2

13 / 30

Angular displacement is zero when

Elimination Tool

A) angle =0

B) v=0

C) r=0

D) both b and c

14 / 30

A jeep travelling at a constant speed of 108 km/hr rounds a curve of radius 100 m. Find its acceleration.

Elimination Tool
Hints

A) 3 m/s2

B) 6 m/s2

C) 7 m/s2

D) 8 m/s2

E) 9m/s2

15 / 30

The rate of change of angular velocity with respect to _____ defines angular acceleration.

Elimination Tool

A) Speed

B) Frequency

C) Distance

D) Time

16 / 30

A body is hanging from a rigid support by an extensible string of length L. It is struck inelastically by an identical body of mass m with horizontal velocity v =√2gl , the tension in the string increases just after striking by:

Elimination Tool

A) mg

B) 3mg

C) 2mg

D) None of these

17 / 30

A mass of 20 kg is lifted from the floor to a height of 2m in 4.9 sec. Calculate the power in Watts.

Elimination Tool

A) 60 W

B) 80 W

C) 100 W

D) 120 W

18 / 30

A wheel starts rotating from result with angular acceleration of 2 rads-2 till its angular speed becomes 6 rad/s. The angular displacement of the wheel will be equal to:

Elimination Tool

A) 4 rad

B) 9 rad

C) 12 rad

D) 7 rad

19 / 30

Which of the following statement shows that no work is done?

Elimination Tool

A) Pushing a car to start it moving

B) Lifting the weights.

C) The moon Orbiting the earth.

D) Writing an essay on a page.

20 / 30

Kilowatt-hour is a unit of?

Elimination Tool

A) Electric Energy

B) Power

C) Momentum

D) Torque

21 / 30

An automobile is moving forwards with uniform velocity due to the force exerted by its engine. If the force is doubled with the velocity remaining constant what happens to its total power?

Elimination Tool

A) It is squared

B) It is halved

C) It is doubled

D) It does not change

22 / 30

A sphere of mass 2 kg and radius 5 cm rolls without slipping along a horizontal plane. The velocity of its centre of mass is 10 cm/s. The kinetic energy of the sphere is:

Elimination Tool
Hints
Option

A) 0.07 J

B) 0.014 J

C) 0.025 J

D) 1.25 J

23 / 30

1 radian = _____ degrees.

Elimination Tool

A) 360

B) 180

C) 100

D) 57.3

24 / 30

A particle moves along the x-axis from x = 0 to x = 5m under the influence of a force given by
F = 7–2x+3×2. The work done in the process is:

Elimination Tool
Option

Option

A) 70 J

B) 270 J

C) 35 J

D) 135 J

25 / 30

One wheel has a diameter of 30 inches and a second wheel has a diameter of 20 inches. The first wheel travels a certain distance revolution in 240 revolutions. In how many revolutions did the second wheel travel the same distance?

Elimination Tool

A) 170

B) 160

C) 360

D) 420

26 / 30

In rotational motion, angular momentum plays a role which is analogous to that played by _____ in linear motion.

Elimination Tool

A) Linear velocity

B) Linear momentum

C) Linear acceleration

D) Inertia

27 / 30

A car going around a certain curve at a speed of 25 km/h has a centripetal force acting on it of 100 N. If the speed of the car is doubled, the centripetal force:

Elimination Tool
Hints

A) Is quadrupled

B) Is doubled

C) Is multiplied by the√2

D) Is reduced to ½ of the original value

28 / 30

A body is moving in a circle at constant speed. Which statement is true?

Elimination Tool

A) The resultant force acts towards the centre of the circle

B) There is no resultant force

C) The resultant force acts away from the centre of the circle

D) None of these options are correct

29 / 30

Work done by the centripetal force on a body moving in circle is zero because

Elimination Tool
Hints

A) the body moves parallel to F

B) the body move opposite to F

C) the body move right angle to F

D) centripetal and centrifugal balance each other

30 / 30

The angular velocity of a rotating disk increases from 2 rad/s to 5 rad/s in 0.5s. What is the disk’s average angular acceleration?

Elimination Tool
Hints

A) 67 rad/s2

B) 46 rad/s2

C) 36 rad/s2

D) 16 rad/s2

E) 6 rad/s2

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