Motion

WinmeenAugust 29, 2018

2 190 Less than a minute

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.

A	half
B	twice
C	four times
D	one fourth

Question 2

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

A	acceleration
B	displacement
C	velocity
D	time

Question 3

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

A	velocity of
B	displacement covered by
C	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

A	5
B	10
C	20
D	40

Question 5

The shortest distance between 2 points.

A	1km
B	distance
C	displacement
D	curved path

Question 6

Scalar quantity

A	Displacement
B	speed
C	velocity
D	acceleration

Question 7

Unit of angular velocity.

A	m/s
B	radian
C	radian/second
D	cm/s

Question 8

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

A	2m/s2
B	3m/s2
C	4m/s2
D	5m/s2

Question 9

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

A	positive
B	decelerated motion
C	uniform acceleration
D	retardation

Question 10

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

A	a starlight line
B	a curved line
C	of any shape
D	a trapezium

Question 11

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

A	centrifugal force
B	gravitational force
C	frictional force
D	electrostatic force

Question 12

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

A	centrifugal
B	electrostatic
C	gravitational
D	frictional

Question 13

SI unit for measuring angle.

A	radian/second
B	radian
C	degree
D	minute

Question 14

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

A	increase
B	remains the same
C	decreases
D	increases and decreases

Question 15

The formula for acceleration is ………………

A	a=v-u/t
B	a=v-t/u
C	a=u-v/t
D	a=u-t/v

Question 16

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

A	weight
B	centripetal force
C	thrust
D	centrifugal force

Question 17

The rate of change of velocity.

A	speed
B	angular velocity
C	acceleration
D	displacement

Question 18

In uniform circular motion the speed is

A	constant
B	increasing
C	changing
D	decreasing

Question 19

When a ball reaches the maximum height its velocity is

A	maximum
B	minimum
C	zero
D	the same

Question 20

The shortest distance between two points.

A	distance
B	displacement

Question 21

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

A	centripetual
B	centrifugal

Question 22

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

A	final
B	initial

Question 23

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

A	gravitational
B	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	A is correct R is wrong
B	R is correct A is wrong
C	R explains A
D	Both A and R are correct

Question 25

Assertion (A) : The average value of ‘g’ is 9.8 m/s²
Reason (R) : Acceleration due to the gravitational force of earth is known as acceleration due to gravity.

A	A is correct R is wrong
B	A is wrong R is correct
C	A is correct R explains A
D	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	A is correct R is wrong
B	A is wrong R is correct
C	A is correct R explains A
D	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	A is correct R is wrong
B	A is wrong R is correct
C	A is correct R explains A
D	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	A is correct R is wrong
B	A is wrong R is correct
C	A is correct R explains A
D	Both A and R are correct

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Motion

Unit – VI Motion - PHYSICS

Winmeen

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