Online TestScience

# Motion

## Unit – VI Motion - PHYSICS

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Question 1 |

When a body starts from rest, the acceleration of the body after 2 seconds is ………… of its displacement.

half | |

twice | |

four times | |

one fourth |

Question 2 |

The gradient or slope of the distance-time graph at any point gives…………..

acceleration | |

displacement | |

velocity | |

time |

Question 3 |

The area under the velocity – time graph represents the ………….. the moving object.

velocity of | |

displacement covered by | |

acceleration of speed of |

Question 4 |

In a 100m race, the winner takes 10s to reach the finishing point. The average speed of the winner is …………..m/s

5 | |

10 | |

20 | |

40 |

Question 5 |

The shortest distance between 2 points.

1km | |

distance | |

displacement | |

curved path |

Question 6 |

Scalar quantity

Displacement | |

speed | |

velocity | |

acceleration |

Question 7 |

Unit of angular velocity.

m/s | |

radian | |

radian/second | |

cm/s |

Question 8 |

Velocity of a car changes from 10 m/s to 50m/s in 10 seconds. What will be its acceleration.

2m/s2 | |

3m/s2 | |

4m/s2 | |

5m/s2 |

Question 9 |

If the velocity of the body decreases with time the acceleration is …………………

positive | |

decelerated motion | |

uniform acceleration | |

retardation |

Question 10 |

In the case of non-uniformly accelerated motion, velocity time graph will be

a starlight line | |

a curved line | |

of any shape | |

a trapezium |

Question 11 |

An electron revolves around the nucleus due to …………….

centrifugal force | |

gravitational force | |

frictional force | |

electrostatic force |

Question 12 |

The moon revolves around the earth due to …………. Force.

centrifugal | |

electrostatic | |

gravitational | |

frictional |

Question 13 |

SI unit for measuring angle.

radian/second | |

radian | |

degree | |

minute |

Question 14 |

When a body is thrown vertically upwards the velocity of the body.

increase | |

remains the same | |

decreases | |

increases and decreases |

Question 15 |

The formula for acceleration is ………………

a=v-u/t | |

a=v-t/u | |

a=u-v/t | |

a=u-t/v |

Question 16 |

The constant force that acts on the body along the radius towards the centre.

weight | |

centripetal force | |

thrust | |

centrifugal force |

Question 17 |

The rate of change of velocity.

speed | |

angular velocity | |

acceleration | |

displacement |

Question 18 |

In uniform circular motion the speed is

constant | |

increasing | |

changing | |

decreasing |

Question 19 |

When a ball reaches the maximum height its velocity is

maximum | |

minimum | |

zero | |

the same |

Question 20 |

The shortest distance between two points.

distance | |

displacement |

Question 21 |

Planets revolve around the sun due to …………… force.

centripetual | |

centrifugal |

Question 22 |

For a freely falling body the ………….. velocity is zero.

final | |

initial |

Question 23 |

For an electron revolving around the nucleus in a circular path……. Force provides the necessary centripetal force.

gravitational | |

electrostatic |

Question 24 |

- Assertion (A) : Velocity is a scalar quantity.
- Reason (R) : If the velocity of the body increase with time the acceleration is positive

A is correct R is wrong | |

R is correct A is wrong | |

R explains A | |

Both A and R are correct |

Question 25 |

- Assertion (A) : The average value of ‘g’ is 9.8 m/s
^{2} - Reason (R) : Acceleration due to the gravitational force of earth is known as acceleration due to gravity.

A is correct R is wrong | |

A is wrong R is correct | |

A is correct R explains A | |

Both A and R are wrong |

Question 26 |

- Assertion (A) : SI unit of Angular Velocity is radian.
- Reason (R) : Linear velocity= Radius of the circle x Angular velocity

A is correct R is wrong | |

A is wrong R is correct | |

A is correct R explains A | |

Both A and R is correct. |

Question 27 |

- Assertion (A) : Uniform circular motion is a special case where the speed of an object is constant but direction changes.
- Reason (R) : Centripetal acceleration acts perpendicular to the centre.

A is correct R is wrong | |

A is wrong R is correct | |

A is correct R explains A | |

Both A and R are correct |

Question 28 |

- Assertion (A) : The moon revolves round the earth due to gravitational force.
- Reason (R) : Electrons revolve round the nucleus due to centripetal force.

A is correct R is wrong | |

A is wrong R is correct | |

A is correct R explains A | |

Both A and R are correct |

Once you are finished, click the button below. Any items you have not completed will be marked incorrect.

There are 28 questions to complete.

5th and 20 th qus are same but answer is different. plz check mad correct it

Corrected