PHYSICS PYQ

Question 1

A pilot has to release the bomb to hit a target?

Right above the object
Beyond the object
Before the target
None of these

Answer 1

Before the object

Question 2

If the horizontal range of projectile is four times its maximum height,the angle of projection is

Answer 2

45 degree

Question 3

The spokes used in the wheel of bicycle increase its

Answer 3

Moment of Inertia

Question 4

Centripetal force is required for

Answer 4

An object moving in a circular path

Question 5

An object’s weight is a measure of

Answer 5

The gravitational force acting on it

Question 6

Projectile motion is characterised by

Answer 6

Both horizontal velocity and vertical acceleration

In projectile motion and object moves with a constant horizontal velocity while experiencing a constant vertical acceleration due to gravity

Question 7

When a body moves in a circular path with constant speed, it’s motion is described as

Uniform motion
Accelerated motion
Uniformly accelerated motion
Non accelerated motion

Answer 7

Accelerated motion

Even though the speed is constant, the direction of the velocity changes at every point of the circular path, resulting in centripetal acceleration towards the centre of the circle

Question 8

Free fall motion is characterised by

Motion under the effect of gravity
Motion in the absence of air resistance
Both a and b
Motion with a constant speed

Answer 8

Both a and b

Free fall describes the motion of an object under the influence of gravitational force only, without any effect from air resistance, causing it to accelerate downward

Question 9

A car moving with 10 m/s speeds up to 20 m/s in 5 seconds.It’s acceleration is

Answer 9

(20-10)/5=2

Question 10

The motion of ——— body is an example of uniformly accelerated motion

Resting
Decelerating
Parabolic
Freely falling

Answer 10

Freely falling

Question 11

Other name of London force

Answer 11

Dispersion force

Weakest intramolecular attractive force
Also called instantaneous dipole-induced dipole force

Question 12

The frictional force exerted by fluids is called

Answer 12

Drag

Question 13

By observing the motion of an objects on an inclined plane ——— deduced that objects move with a constant speed when no force acts on them

Answer 13

Galileo

Question 14

The range of —— force is of the order of 10^-16 m

Electromagnetic
Gravitational
Strong nuclear
Weak nuclear

Answer 14

Weak nuclear

Question 15

If two forces acting on an object from opposite directions, then the magnitude of the net force on it is the

Product
Sum
Ratio
Difference

Answer 15

Difference

Question 16

Torsion balance measures which quantity

Answer 16

Force

Question 17

Which of the following is a action at distance force

Friction
Tension
Gravitation
Pull

Answer 17

Gravitaion

Question 18

S=ut+1/2 at^2 describes_________ relation

Position time
Distance time
Position velocity
Velocity time

Answer 18

Distance time

Note: it gives the displacement of an object under constant acceleration

Question 19

Power exerted by an object moving in a straight line is equal to Force multiplied by ———

Answer 19

Velocity

Question 20

In 1785 who use the calibrate torsion balance to measure the force between electric charges?

Answer 20

Coulomb

Question 21

Which of the following is responsible for the rotation of the plane of oscillation of Foucault’s pendulum

Answer 21

Coriolis force

Question 22

The measure of force that can cause an object to rotate about an axis is called

Centripetal force
Power
Torque
Moment of inertia

Answer 22

Torque

Note : Here measure of force is asked not force

Question 23

What should a person n a freely rotating turn table do to decrease his angular speed?

Bring his hands together
Raise his hands up
Spread his hands outward
Sit down with raised hands

Answer 23

Spread his hands outwards

Question 24

Which law is called law of Galileo

Answer 24

Newton’s first law of motion

Question 25

Damp clothes are dried in spin dryers by the action of Centrifugal force Centripetal force Central force Non central force

Answer 25

Centrifugal force

Question 26

The centre of gravity of a sprinter during the race lies Ahead of his feet Behind his feet At the centre of the body To the left side of the body

Answer 26

Ahead of his feet

Question 27

The function of ball bearings in a wheel is for

Answer 27

To convert kinetic friction into rolling friction

Question 28

Milk to cream separator which force is used

Answer 28

Centrifugal force

Question 29

Vehicle tyres are inflated properly to

Answer 29

To avoid skidding and to minimise friction

Question 30

Angle of friction and angle of repose are Equal Not equal Proportional None

Answer 30

Equal

Question 31

When you push a heavy box across the floor the box exerts an equal and opposite force on you.Why don’t you move backward?

Answer 31

Because the friction between your feet and the floor prevents you from moving

Question 32

A 70 kg man pushes a 50 kg man with a force of 50N. How much force has a 50kg man pushed the other person?

Answer 32

50 N(same force)

Question 33

According to Newton’s third law of motion, if you jump off a boat onto the deck, the boat will move in the opposite direction due to

Answer 33

Action and reaction force

Question 34

When a tennis player hits a ball with a racket, which of Newton’s laws is being demonstrated

Answer 34

All the three laws

Question 35

Force between two bodies, always is

Answer 35

Used in the same and opposite direction

Question 36

Which force causes a ball to bounce of the ground after being dropped?

Answer 36

Normal force

Question 37

What is the unit of power in British imperial sysytem

Answer 37

Horsepower

Question 38

1 Horse Power =

Answer 38

**746 W**

Question 39

If displacement is horizontal to the applied force then work done is Zero Negative Positive Neutral

Answer 39

Positive

Question 40

Definition of Joule

Answer 40

One joule is equal to the work done by a force of one newton acting over a distance of one meter

Question 41

Definition of power with respect to energy

Answer 41

Power is the rate at which energy is transferred

Question 42

What is work energy theorem

Answer 42

Work done by a force is equal to the change in Kinetic energy of an object

Question 43

Which form of energy is associated with the motion of molecules and atoms

Answer 43

Thermal energy

Question 44

Who find Gravitational constant,when,value?

Answer 44

Henry Cavendish June 1798 6.75*10^-11 Nm^2/kg^2

Question 45

Who was the first to conclude that in vacuum all objects fall with the same acceleration g and reach the ground at the same time

Answer 45

Galileo Galilei

Question 46

Which instrument was used to detect gravitational waves for the very first time

Answer 46

LIGO

Question 47

If an apple is taken to a mountain top then it’s weight is Decreased Increased Constant

Answer 47

Decreased

Question 48

First man who came up with the idea of gravity

Answer 48

Newton

Question 49

The English physicist James Prescott Joule outlined the basis of the

Answer 49

Principle of conservation

Question 50

An electric bulb of 60 W is used for 6 hrs/ day.Calculate the units of energy consumed in one day by the bulb

Answer 50

Power=0.06 kW Energy=P*t=0.06 * 6 = 0.36 kWh = 0.36 Units

Question 51

Escape velocity is the —————- velocity required for an object to break the gravitational pull Maximum Minimum Variable Constant

Answer 51

Minimum

Question 52

—————determines the magnitude of the gravitational force in Newton’s law of universal gravitation

Answer 52

Gravitational constant

Question 53

What is the primary reason why astronauts experience weightlessness in space Absence of gravity Reduction in the Earth’s gravitational force Constant free fall around the earth Anti gravity technology

Answer 53

Constant free fall around the earth

Question 54

What is the gravitational force experienced by an object placed on the surface of the earth Zero Constant Varies with altitude Depends on Mass of the object

Answer 54

Depends on the mass of the object

Question 55

What is the gravitational force experienced by an object in free fall Depends on the mass of the object Equal to the weight of the object Constant Zero

Answer 55

Equal to the weight of the object

Question 56

Distance time graph is _________ for uniform motion Straight line Curved line

Answer 56

Straight line Curved line for non-uniform motion

Question 57

Rate of change of position of an object in any direction is Velocity Speed

Answer 57

Answer: Speed Velocity is the rate of change of position of an object in a particular direction

Question 58

When speed is decreasing after increasing. What it is called?

Answer 58

Retardation

Question 59

In velocity time graph with constant velocity, the line is

Answer 59

Straight line which is horizontal to time axis

Question 60

Is pressure a scaler or vector quantity?

Answer 60

Scalar quantity Others : all type of energy, work done, power, current, potential difference, resistance

Question 61

Is weight and moment a scalar or vector quantity

Answer 61

Vector quantity

Question 62

Area of distance time graph Slope of distance time graph

Answer 62

Motion Speed Note: slope increases as object moves faster

Question 63

Slope of velocity time graph Area of velocity time graph

Answer 63

Acceleration Displacement

Question 64

In free fall initial velocity is equal to

Answer 64

Zero

Question 65

A body which, after having been given an initial velocity allowed to move under the influence of gravity alone is called

Answer 65

Projectile motion

Question 66

Any motion which repeats itself after a regular interval of time is called? If it is about to fix a point ? What is time period ?

Answer 66

Periodic motion Oscillatory motion The period of a limitation is called time period

Question 67

In uniform circular motion, what is the characteristics of acceleration and velocity?

Answer 67

Acceleration towards the centre in circular path Change in velocity at every point

Question 68

What happens to the elastic modulus of a material as its stiffness increases? Decreases Increases Becomes zero Remains unchanged

Answer 68

Elastic modulus increases The elastic modulus is a measure of materials stiffness and as the stiffness of a material increases, its elastic modulus also increases.

Question 69

Shock absorbers are usually made of steel as it: Has no ductile property Has higher elasticity Has lower elasticity Is not brittle

Answer 69

Has higher elasticity

Question 70

For a perfectly elastic body, the value of the coefficient of restitution is

Answer 70

**1** The coefficient of restitution is the ratio of final to initial relative velocity between two objects after colliding

Question 71

The ability of a material to deform without breaking is called

Answer 71

Plasticity

Question 72

Which type of defamation occurs when a material does not return to its original shape after the removal of stress

Answer 72

Plastic deformation

Question 73

The maximum strength, the material can undergo before deforming permanently is called Elastic limit Modulus of elasticity Resilience Poison’s ratio

Answer 73

Elastic limit

Question 74

Ductility is the property of a material which is used to make

Answer 74

Long wire Malleability -thin sheet

Question 75

_________ is defined as force per unit area Strain Power Stress Young’s modulus

Answer 75

Stress

Question 76

_________ is the ratio of lateral strength to longitudinals strain Elastic limit Modulus is of elasticity resilience Poisons ratio

Answer 76

Poisons ratio Poisons ratio describes the proportional change in lateral dimension to the change in longitudinal dimension of a material under stress

Question 77

Which type of stress cause a material to compress or shorten in length Tensile stress Shear stress Compressions stress Torsional stress

Answer 77

Compression stress. Compression stress refers to the stress that tends to compress or shorten the length of a material along its longitudinal axis

Question 78

The modulus of rigidity is the ratio of

Answer 78

Shearing stress to shearing strain

Question 79

Breaking stress in a stress strain curve indicates

Answer 79

Point of fracture

Question 80

Which type of defamation occurs when a material undergoes a sudden change in shape without significant stress

Answer 80

Brittle Deformation Brittle defamation refers to the sudden irreversible change in shape or fracture of a material without a significant plastic deformation or stress

Question 81

Equation which represent hook’s law

Answer 81

F=-kx k-spring constant or force constant x-Displacement in the spring

Question 82

What is Young’s modulus

Answer 82

Measures a material resistance to tensile forces Young’s modulus also known as modulus of elasticity in tension, quantifies, a material resistance to stretching or compression along its length

Question 83

Which of the following material exhibit a high elasticity? Rubber Glass Steel Plastic

Answer 83

Steel

Question 84

Young’s modulus and the stiffness of a material are Inversely proportional Directly proportional No relation Equal

Answer 84

Directly proportional Young’s modulus is a measure of material stiffness

Question 85

What is the ultimate tensile strength of a material?

Answer 85

The maximum stress a material can with stand without breaking

Question 86

______ is conserved in elastic collision Kinetic energy Momentum Both Neither

Answer 86

Both

Question 87

What is the role of temperature in the elasticity of a material?

Answer 87

Temperature affects elasticity differently for different materials

Question 88

The ratio of stress to strain is called the

Answer 88

Modulus of elasticity

Question 89

Which of the following have greater density? Petrol or water

Answer 89

Water. Petrol fire cannot be put out to by water because water is more denser than petrol