# Motion

## Unit – VI Motion - PHYSICS

Congratulations - you have completed Unit – VI Motion - PHYSICS. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%
 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.
 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.
 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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There are 28 questions to complete.