Physics MCQ's

Question 1

What would be the displacement of a particle moving in a circular path of radius r after a displacement of half a circle?

2πr
πr
2r
Zero

Answer 1

2r

Question 2

The path length travelled by a body in a given time interval is known as _____.

distance
velocity
acceleration
moment

Answer 2

distance

Question 3

Which of the following situations is true and possible?

If the velocity of a body is zero, then the acceleration can be non-zero
A body moving at a constant velocity can have acceleration
The magnitude of distance and displacement are equal in a circular motion
All of the above

Answer 3

If the velocity of a body is zero, then the acceleration can be non-zero

Question 4

A body moving in a straight line has a uniform motion if it travels _____ distance in equal time intervals.

equal
unequal

Answer 4

equal

Question 5

Suppose a boy is moving with a uniform velocity of 10 m/s on a merry-go-round ride. Which of the following is true of the given scenario?

The boy is at rest
The boy is moving with no acceleration
The boy is moving with accelerated motion
The boy is moving with uniform velocity

Answer 5

The boy is moving with accelerated motion

Explanation: Change in direction in a merry-go-round

Question 6

Which of the following is true of a free-falling body?

It moves with non-uniform motion
It has zero velocity
It has constant non-zero acceleration
It has non-uniform acceleration

Answer 6

It has constant non-zero acceleration

Question 7

What happens to a moving object if the resultant force
on it is zero?

Answer 7

It keeps moving

Question 8

What happens to a moving object if the resultant force on it is not zero?

Answer 8

Speeds up in the direction of the resultant force

Question 9

What type of force keeps an object moving in a circle?

Answer 9

Centripetal Force or Inward Force

Question 10

Which equation connects charge, current and time?

Answer 10

Charge = current x time

Question 11

Pressure is exerted in a box ………:
Is the same in all directions
Is greater at the bottom
Is greater at the top
Is greater at the sides

Answer 11

Is the same in all directions

Question 12

A hot air balloon is lifted off the ground. What is the density of the air created under the envelope?
A) Greater than surrounding air
B) Less than surrounding air
C) Equal to the surrounding air
D) None of the above

Answer 12

B) Less than surrounding air

Question 13

What is the difference between the centre of gravity and centre of mass?
A) The centre of mass is the same as the centre of gravity on Earth but in space the centre of gravity changes but the centre of mass does not.
B) The centre of mass is the point at where mass is concentrated and the centre of gravity is the point at where weight seems to be concentrated.
C) The centre of mass is always at the core of an object and the centre of gravity depends on the width of the object.
D) The centre of mass and the centre of gravity have the same point at the core of an object independent of mass distribution or gravitational field.

Answer 13

B) The centre of mass is the point at where mass is concentrated and the centre of gravity is the point at where weight seems to be concentrated.

Question 14

Moment Definition

Answer 14

Moment is the PRODUCT of the Magnitude of force and the PERPENDICULAR distance from the point of the line of action

Question 15

The moment of couple is mathematically the :
(a) product of one force and the perpendicular distance between two forces
(b) product of both forces and the perpendicular distance between them
(c) product of one force and tKe perpendicular distance between the point of
application of force and turning point.
(d) None of the above.

Answer 15

(a) product of one force and the perpendicular distance between two forces

Question 16

The condition for equilibrium is:
(a) the resultant of all the forces acting on the body be zero only.
(b) the resultant of moments of all the forces acting on the body about the turning point
should be zero.
(c) both (a) and (b)
(d) none of the above

Answer 16

(b) the resultant of moments of all the forces acting on the body about the turning point
should be zero.

Question 17

A body is acted upon by two unequal and opposite forces along different lines of
action of force. The body will have
(a) only rotatory motion
(b) only translatory motion
(c) both (a) and (b)
(d) neither (a) nor (b)

Answer 17

(a) only rotatory motion

Question 18

A force F acts on a rigid body capable of turning around a fixed point. The moment
of force depends upon
(a) magnitude of force F
(b) magnitude of perpendicular distance between the point of action of force and the
turning point
(c) both (a) and (b)
(d) none of these

Answer 18

(c) both (a) and (b)

Question 19

The centre of gravity of a cricket ball is at:
(a) its geometric centre
(b) at its bottom touching the ground
(c) its top most point
(d) at any point on its surface

Answer 19

(a) its geometric centre

Question 20

A body is describing a uniform cicular motion. Which of the following quantities
is/are constant
(a) speed
(b) acceleration
(c) velocity
(d) both (a) and (b)

Answer 20

(a) speed

Question 21

In a uniform circular motion :
(a) speed of body continuously changes because the direction of motion changes
(b) velocity of body continuously changes because the direction of motion changes
(c) the motion of body is accelerated
(d) both (b) and (c)

Answer 21

(d) both (b) and (c)

Question 22

What happens when you multiply a Vector quantity by a Scalar quantity?

Answer 22

It is still a Vector quantity

Question 23

What happens when you multiply a Vector quantity by a Scalar quantity?

Answer 23

It forms either a
DOT Product: Result is a scalar
Cross Product: Result is a Vector

Question 24

What is heat transfer?
a) Flow of thermal energy from low-temperature reservoir to high-temperature reservoir
b) Flow of energy in the form of heat from high-temperature reservoir to low-temperature reservoir
c) Flow of thermal energy irrespective of reservoir temperature
d) None of the above

Answer 24

b) Flow of energy in the form of heat from high-temperature reservoir to low-temperature reservoir

Question 25

On which of the following, convective heat transfer coefficient doesn’t depend on?
a) Orientation of solid surface
b) Time
c) Surface area
d) Space

Answer 25

c) Surface area

Question 26

What does the moment of the force measure?
a) The tendency of rotation of the body along any axis
b) The moment of inertia of the body about any axis
c) The couple moment produced by the single force acting on the body
d) The total work is done on the body by the force

Answer 26

a) The tendency of rotation of the body along any axis

Question 26

2. Which of the following is correct w.r.t the moment (M) of the force (F) acting on the body at a distance L from the axis of the rotation?
   a) M=FLsinθ
   b) M=FLcosθ
   c) M=F.Lsinθ
   d) M=FxLsinθ

Answer 26

Answer: A
Explanation: The moment of the force about the axis of rotation by the application of the force on the body is given by the cross product of both. If the force not perpendicular to the axis, and making angle θ then cosine form of angle is used. As usually used in the cross product.

Question 26

A body is consisted of __________ number of particles.
a) Infinite
b) Finite
c) Hundreds
d) Thousands

Answer 26

a) Infinite

Question 27

The total of all the weights of small particles adds up to give the total body weight. This weight is the force vector which is being passed by ________
a) Axis of rotation
b) Axis of rolling
c) Centre of Gravity
d) Centre of mass

Answer 27

c) Centre of Gravity

Question 28

The centre of gravity is the ratio of ________ to _________
a) The product of centroid and weight to the total weight
b) The addition of centroid and weight to the total weight
c) The subtraction of centroid and weight to the total weight
d) The product of centroid and weight to the total mass

Answer 28

a) The product of centroid and weight to the total weight

Question 29

The centre of mass is the ratio of ________ to _________
a) The product of centroid and mass to the total weight
b) The addition of centroid and weight to the total weight
c) The subtraction of centroid and weight to the total weight
d) The product of centroid and mass to the total mass

Answer 29

d) The product of centroid and mass to the total mass

Question 30

The x axis coordinate and the y axis coordinate of the centre of gravity are having different types of calculations to calculate them.
a) True
b) False

Answer 30

b) False

The calculation is general to all the axis of the coordinate system. This means that the calculations are generalised for all the axis. And it is the product of the centroid of the section to its mass to the total weight of the body is the centre of gravity.