**Uniform Circular Motion in Hindi**. We covered all the Uniform Circular Motion in Hindi in this post for free so that you can practice well for the exam.

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## Mock Test on Uniform Circular Motion for Students

## UCM is an example of motion in which :

(A) Speed is constant with zero acceleration

(B) Velocity is constant with zero acceleration

(C) Speed is constant with constant acceleration

(D) Speed is variable with constant acceleration

Option c - Speed is constant with constant acceleration

## The torque due to centripetal force about the axis of rotation to maintain UCM :

(A) zero

(B) f.r

(C) r x f

(D) finite

Option a - zero

## Assume that the earth goes around the sun in a circular orbit with a constant speed of 30 km/s

(A) Average velocity of the earth from 1 Jan to 30 June is Zero.

(B) The average acceleration from 1 Jan to 30 June is 60 km/s²

(C) The average speed of the earth from 30 June to 31 Dec is Zero.

(D) The instantaneous acceleration of the earth points towards the sun.

Option d - The instantaneous acceleration of the earth points towards the sun

## An airplane is moving on a circular path with a uniform speed of 300 km/hr. The change in velocity after half the revolution is :

(A) Zero

(B) 150 km/hr

(C) 600 km/hr

(D) 900 km/hr

Option c - 600 km/hr

## A sphere of mass 100 g is attached to a string of length 1.3 m whose upper end is fixed to the ceiling. The sphere is made to describe a horizontal circle of radius 50 cm. The time period of the revolution is :

(A) 5.05 s

(B) 4.55 s

(C) 3.25 s

(D) 2.19 s

Option d - 2.19 s

## A stone is rotated steadily in a horizontal circle with a period T by a string of length 1. If the tension in the string is kept constant and I is increased by 1%. What is the percentage change in the time period? :

(A) 1%

(B) 0.5 %

(C) 2%

(D) 0.25 %

Option b - 0.5 %

## In uniform circular motion :

(A) Both velocity and acceleration are constant

(B) Acceleration and speed are constant but velocity changes

(C) Both acceleration and velocity change

(D) Both decreases and speed is constant

Option c - Both acceleration and velocity change

## Which of the following does not remains constant in UCM?

(A) Speed

(B) Kinetic energy

(C) Angular momentum

(D) Velocity

Option d - Velocity

## A particle tied to one end of a string is being revolved in UCM in a horizontal plane. The tension in the string is :

(A) Same at all points

(B) Varying from point to point

(C) Maximum at one point and minimum at diametrically opposite points

(D) Maximum at points normal to each other

Option a - Same at all points

## A can filled with water is revolved in a vertical circle of radius 4 m and water just do not fall down at the highest point. The time period of revolution is : (g = 9.8 m/s²)

(A) 1 s

(B) 2 s

(C) 4 s

(D) 8 s

Option c - 4 s

We covered all the uniform circular motion in Hindi above in this post for free so that you can practice well for the exam.

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