Master Mechanics: Online Quizzes for Year 12 Physics

Question 1

A car travels at a constant speed of 10 meters per second for 5 seconds. How far does the car travel in that time?

Accepted Answer

50 meters

Answer

10 meters

Answer

100 meters

Answer

5 meters

Question 2

A car with a mass of 1000 kilograms is traveling at a velocity of 20 meters per second. What constant braking force is needed to stop the car over a distance of 50 meters?

Accepted Answer

4000 N

Answer

2000 N

Answer

6000 N

Question 3

In an inelastic collision between two moving objects, the total momentum of the system is conserved. Explain how this conservation law applies to the collision.

Accepted Answer

Momentum is conserved because the vector sum of the momenta of the individual objects remains constant before and after the collision, regardless of the nature of the collision.

Answer

Momentum is conserved because the total kinetic energy of the system remains constant before and after the collision.

Answer

Momentum is conserved because the total mass of the system remains constant before and after the collision.

Answer

Momentum is conserved because the external force acting on the system is zero.

Question 4

A satellite with mass 'm' orbits Earth in a circular path with radius 'r'. If the satellite's orbital period is 'T', calculate its speed.

Accepted Answer

v = 2πr/T

Answer

v = πr/2T

Answer

v = 2πrT

Answer

v = πr²T

Question 5

According to Newton's first law of motion, an object at rest will remain at rest unless an:

Accepted Answer

External force is applied

Answer

Internal force is applied

Answer

Gravitational force is applied

Answer

Frictional force is applied

Question 6

When a 10 N force is applied to a 2 kg mass, what acceleration is produced?

Accepted Answer

2 m/s^2

Answer

0.5 m/s^2

Answer

5 m/s^2

Answer

10 m/s^2

Question 7

Momentum of a system remains constant if:

Accepted Answer

No external forces act on the system

Answer

Only internal forces act on the system

Answer

The object is moving with constant velocity

Answer

The system is stationary

Question 8

A car of mass 1000 kg traveling at 20 m/s applies its brakes, providing a constant deceleration of 5 m/s^2. What distance does the car cover before coming to a stop?

Accepted Answer

200 m

Answer

100 m

Answer

400 m

Answer

800 m

Question 9

A block with a mass of 2 kg is placed on a rough horizontal surface with a coefficient of friction of 0.2. Determine the force of friction acting on the block in Newtons.

Accepted Answer

0.4 N

Answer

2 N

Answer

4 N

Answer

8 N

Question 10

A charged particle moves with constant speed perpendicular to a uniform magnetic field. What is the effect of the magnetic field on the particle's velocity?

Accepted Answer

The magnetic field changes the direction of the particle's velocity.

Answer

The magnetic field increases the particle's speed.

Answer

The magnetic field decreases the particle's speed.

Answer

The magnetic field has no effect on the particle's velocity.

Question 11

Define resonance in mechanical systems and provide specific examples of its applications in engineering and music.

Accepted Answer

Resonance occurs when an external force matches the natural frequency of a system, causing a significant increase in amplitude.

Accepted Answer

Resonance can lead to catastrophic failures in engineering structures if the resonance frequency aligns with an external force.

Answer

Resonance is only possible in systems with low damping.

Answer

Resonance is only applicable in engineering contexts.

Question 12

How does a load cell measure force?

Accepted Answer

By converting the force into an electrical signal

Answer

By measuring the change in length of a spring

Answer

By measuring the force exerted on a surface

Answer

By measuring the change in voltage

Question 13

A force of 10 N is applied to an object with a mass of 2 kg. What is the acceleration of the object?

Accepted Answer

10 m/s²

Answer

5 m/s²

Answer

15 m/s²

Answer

20 m/s²

Question 14

Which of the following is a vector quantity?

Accepted Answer

Displacement

Answer

Temperature

Answer

Mass

Answer

Time

Question 15

Which of the following is a unit of energy?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Kelvin

Question 16

Which of the following is a fundamental force in nature?

Accepted Answer

Gravitational force

Answer

Frictional force

Answer

Elastic force

Answer

Magnetic force

Question 17

Which of the following is not a vector quantity in Physics?

Accepted Answer

Mass

Answer

Velocity

Answer

Acceleration

Answer

Force

Question 18

Which force among the following is conservative in nature?

Accepted Answer

Gravitational force

Answer

Friction

Answer

Air resistance

Answer

Tension

Question 19

A torque is applied to a rigid body about a fixed axis. Which of the following does NOT affect the resulting angular acceleration of the body?

Accepted Answer

Mass of the body

Answer

Magnitude of the torque

Answer

Moment of inertia of the body about the axis of rotation

Answer

Distance from the axis of rotation to the point where the force is applied

Question 20

A ray of light travels from air into water. Which of the following is true about its behaviour?

Accepted Answer

It will bend towards the normal (air-water boundary).

Answer

It will bend away from the normal (air-water boundary).

Answer

It will not bend.

Answer

It will reflect.

Question 21

An object is moving at a constant velocity. Which of the following statements about its acceleration is correct?

Accepted Answer

(a) Its acceleration is zero.

Answer

(b) Its acceleration is constant but non-zero.

Answer

(c) Its acceleration is increasing.

Answer

(d) Its acceleration is decreasing.

Question 22

Which of the following is a vector quantity?

Accepted Answer

(b) Velocity

Answer

(a) Speed

Answer

(c) Mass

Answer

(d) Time

Question 23

Which of the following is the SI unit of momentum?

Accepted Answer

(a) kg m/s

Answer

(b) m/s

Answer

(c) kg m/s²

Answer

(d) N

Question 24

An object moves from position A to B with a distance of 10 meters. The displacement of the object is:

Accepted Answer

10 meters

Answer

10 meters north

Answer

The direction from A to B

Answer

The speed at which the object moves

Question 25

The momentum of an object is:

Accepted Answer

Mass times velocity

Answer

Force times time

Answer

Displacement times acceleration

Answer

Energy times distance

Question 26

The work done by a force is:

Accepted Answer

Force times displacement in the direction of the force

Answer

Force times time

Answer

Displacement times time

Answer

Mass times acceleration

Question 27

The efficiency of a machine is:

Accepted Answer

Output energy divided by input energy

Answer

Input energy divided by output energy

Answer

Useful energy divided by total energy

Answer

Total energy divided by useful energy

Question 28

A block of mass 5 kg is pushed across a horizontal surface with a force of 20 N. The coefficient of friction between the block and the surface is 0.2. What is the block's acceleration?

Accepted Answer

3.6 m/s²

Answer

10 m/s²

Answer

5 m/s²

Answer

2 m/s²

Question 29

Which of the following is a vector quantity?

Accepted Answer

Velocity

Answer

Energy

Answer

Temperature

Answer

Mass

Question 30

Which of the following is a unit of momentum?

Accepted Answer

Kilograms meters per second

Answer

Newtons

Answer

Watts

Answer

Joules

Question 31

A spring of spring constant k is stretched by a distance x. What is the energy stored in the spring?

Accepted Answer

1/2 kx²

Answer

kx/2

Answer

2kx

Answer

kx

Question 32

A force of 10 N is applied to an object of mass 2 kg. What acceleration is produced on the object?

Accepted Answer

5 m/s²

Answer

2 m/s²

Answer

10 m/s²

Question 33

Which of the following is NOT a vector quantity?

Accepted Answer

Mass

Answer

Momentum

Answer

Force

Answer

Velocity

Question 34

A car accelerates uniformly from rest to a speed of 20 m/s in 5 seconds. Calculate the car's acceleration.

Accepted Answer

4 m/s²

Answer

100 m/s²

Answer

1 m/s²

Answer

0.25 m/s²

Question 35

A ball is thrown vertically upwards with an initial velocity of 15 m/s. Determine the maximum height reached by the ball. (Assume g = 10 m/s²)

Accepted Answer

11.25 m

Answer

7.5 m

Answer

30 m

Answer

15 m

Question 36

A 2 kg object is moving at 4 m/s. Calculate its momentum.

Accepted Answer

8 kg m/s

Answer

0.5 kg m/s

Answer

2 kg m/s

Answer

16 kg m/s

Question 37

A 10 kg block is at rest on a horizontal surface. The coefficient of static friction between the block and the surface is 0.4. Determine the minimum force required to start the block moving.

Accepted Answer

39.2 N

Answer

100 N

Answer

40 N

Answer

10 N

Question 38

A car travels 100 km in 2 hours. Calculate the average speed of the car.

Accepted Answer

50 km/h

Answer

100 km/h

Answer

200 km/h

Answer

25 km/h

Question 39

A torque of 20 Newton meters is applied to a wheel with a radius of 0.5 meters. What is the angular acceleration of the wheel?

Accepted Answer

40 rad/s²

Answer

10 rad/s²

Answer

80 rad/s²

Question 40

A ball is thrown vertically upwards with an initial velocity of 10 meters per second. What is the ball's velocity at its highest point?

Accepted Answer

0 m/s

Answer

10 m/s

Answer

-10 m/s

Answer

5 m/s

Question 41

A 5 kg object is acted upon by a force of 20 Newtons. What is the object's acceleration?

Accepted Answer

4 m/s²

Answer

1 m/s²

Answer

100 m/s²

Question 42

A stationary object has a mass of 5 kg. What is its momentum?

Accepted Answer

0 kg m/s

Answer

5 kg m/s

Answer

10 kg m/s

Question 43

A ball is thrown horizontally from a cliff. Ignoring air resistance, which of the following statements about the ball's motion is true?

Accepted Answer

The ball's horizontal velocity remains constant.

Answer

The ball's vertical velocity decreases.

Answer

The ball's horizontal velocity increases.

Answer

The ball's vertical velocity remains constant.

Question 44

A car is travelling at a constant speed of 10 m/s around a circular track. Which of the following statements about the car's motion is true?

Accepted Answer

The car is accelerating because its direction is changing.

Answer

The car is not accelerating because its speed is constant.

Answer

The car is accelerating because its speed is increasing.

Question 45

A 50 kg object is placed on a horizontal surface. The coefficient of static friction between the object and the surface is 0.4. What is the minimum force required to start the object moving?

Accepted Answer

196 N

Answer

50 N

Answer

200 N

Question 46

A car accelerates from rest to a speed of 20 m/s in 5 seconds. What is the car's average acceleration?

Accepted Answer

4 m/s²

Answer

0.25 m/s²

Answer

1 m/s²

Answer

100 m/s²

Question 47

A ball is thrown vertically upwards with an initial velocity of 10 m/s. What is the ball's velocity at its highest point?

Accepted Answer

0 m/s

Answer

-10 m/s

Answer

10 m/s

Answer

5 m/s

Question 48

A 10 kg object is at rest. A constant force of 50 N acts on the object for 2 seconds. What is the object's final velocity?

Accepted Answer

10 m/s

Answer

200 m/s

Answer

25 m/s

Answer

5 m/s

Question 49

A 5 kg box is sliding across a frictionless surface with a velocity of 4 m/s. What is the kinetic energy of the box?

Accepted Answer

40 J

Answer

20 J

Answer

10 J

Answer

80 J

Question 50

Two objects, one with a mass of 2 kg and the other with a mass of 4 kg, are moving towards each other with equal speeds. Which object has a greater momentum?

Accepted Answer

The 4 kg object

Answer

The 2 kg object

Answer

Both have the same momentum

Question 51

A car is traveling at a constant speed of 10 m/s around a circular track. Which of the following statements is true about the car's motion?

Accepted Answer

The car has a changing velocity

Answer

The car has a constant acceleration

Answer

The car has no acceleration

Answer

The car has a constant velocity

Question 52

A 2 kg object is dropped from a height of 10 meters. What is the object's potential energy just before it hits the ground?

Accepted Answer

196 J

Answer

20 J

Answer

49 J

Answer

98 J

Question 53

A 1000 kg car collides head-on with a 500 kg car. Which car experiences a greater force during the collision?

Accepted Answer

Both cars experience the same force

Answer

The 500 kg car

Answer

It depends on the initial velocities of the cars

Answer

The 1000 kg car

Question 54

A satellite is orbiting the Earth at a constant speed. Which force is responsible for keeping the satellite in orbit?

Accepted Answer

Gravity

Answer

Friction

Answer

Electromagnetism

Answer

Air resistance

Question 55

A 5 kg object is moving at a constant velocity of 2 m/s. What is the net force acting on the object?

Accepted Answer

0 N

Answer

10 N

Answer

5 N

Answer

2.5 N