Live Education Quiz

1

Mass of a body is defined as:

A Force acting on the body B Quantity of matter in the body C Weight of the body D Volume of the body

2

The SI unit of mass is:

A Newton B Gram C Kilogram D Pound

3

Mass of a body remains:

A Same everywhere B Different on Moon C Zero in space D Dependent on gravity

4

Inertia is the property of a body due to which it:

A Moves faster B Changes shape C Resists change in its state D Stops moving

5

Greater mass means:

A Less inertia B More inertia C No inertia D Zero inertia

6

Which object has greater inertia?

A Cricket ball B Football C Truck D Tennis ball

7

Weight of a body is the force due to:

A Air B Magnetism C Gravity D Electric field

8

SI unit of weight is:

A Kilogram B Newton C Joule D Watt

9

Weight of a body depends upon:

A Mass only B Gravity only C Mass and gravity D Volume

10

Weight of a body on the Moon is:

A Same as Earth B Zero C More than Earth D Less than Earth

11

Gravitational field strength is defined as:

A Force per unit mass B Mass per unit force C Energy per unit mass D Weight per unit volume

12

Symbol used for gravitational field strength is:

A g B — C W D m

13

Value of gravitational field strength on Earth is approximately:

A 1 N/kg B 4.9 N/kg C 9.8 N/kg D 98 N/kg

14

Which instrument is used to measure mass?

A Spring balance B Force meter C Electronic balance D Thermometer

15

Which instrument is used to measure weight?

A Electronic balance B Beam balance C Spring balance D Stopwatch

16

Spring balance measures:

A Mass B Volume C Force D Density

17

Force that acts only when bodies are in contact is called:

A Gravitational force B Magnetic force C Contact force D Electric force

18

Which of the following is a contact force?

A Gravitational force B Friction C Magnetic force D Electric force

19

Force that acts without physical contact is called:

A Contact force B Applied force C Non-contact force D Frictional force

20

Which is a non-contact force?

A Friction B Tension C Gravitational force D Normal reaction

21

How many fundamental forces are there in nature?

A Two B Three C Four D Five

22

Which is NOT a fundamental force?

A Gravitational B Electromagnetic C Strong nuclear D Frictional

23

Free body diagram represents:

A Motion of body B All forces acting on a body C Shape of body D Velocity of body

24

In free body diagram, forces are shown by:

A Lines B Dots C Arrows D Circles

25

Newton’s First Law of Motion is also called:

A Law of acceleration B Law of inertia C Law of action-reaction D Law of gravitation

26

According to Newton’s First Law, a body remains at rest if:

A Net force is zero B Force is applied C Mass is large D Velocity is high

27

Newton’s First Law applies to bodies in:

A Only rest B Only motion C Rest or uniform motion D Accelerated motion only

28

Net force zero means body has:

A Increasing speed B Decreasing speed C Constant velocity D Changing direction

29

Effect of force on velocity can be:

A Change in speed B Change in direction C Change in both D No change

30

A force can change the direction of velocity as in:

A Straight line motion B Circular motion C Rest position D Equilibrium

31

When brakes are applied, passengers move forward due to:

A Gravity B Friction C Inertia D Weight

32

Seat belts are used in cars to overcome effects of:

A Weight B Mass C Inertia D Momentum

33

If net force on a body is not zero, body will:

A Remain at rest B Move with constant velocity C Accelerate D Stop moving

34

Unit of gravitational field strength N/kg is equivalent to:

A m/s B m/s² C kg/m D N/m

35

Mass measured by electronic balance depends on:

A Gravity B Spring constant C Comparison with standard mass D Temperature

36

Which force is responsible for weight?

A Magnetic force B Electric force C Gravitational force D Nuclear force

37

Inertia depends upon:

A Volume B Mass C Velocity D Weight

38

Which has more inertia?

A Empty cart B Loaded cart C Football D Tennis ball

39

Force is a vector quantity because it has:

A Magnitude only B Direction only C Magnitude and direction D No unit

40

Which force keeps planets in their orbits?

A Frictional force B Magnetic force C Gravitational force D Nuclear force

41

The tendency of a body to oppose change in motion is called:

A Momentum B Force C Inertia D Velocity

42

What is meant by the resultant force?

A Force that stops motion B Single force having same effect as multiple forces C Force due to gravity only D Force applied by an object

43

If all forces acting on a body cancel each other, the resultant force is:

A Maximum B Minimum C Zero D Infinite

44

Newton’s Second Law of Motion relates force with:

A Velocity B Momentum C Acceleration D Distance

45

The mathematical form of Newton’s Second Law is:

A F = mv B F = ma C F = m/a D F = a/m

46

Unit of force in SI system is:

A Dyne B Joule C Newton D Watt

47

If mass of a body is doubled and force remains same, acceleration will:

A Double B Become half C Remain same D Become zero

48

Newton’s Third Law of Motion states that:

A Force equals mass times acceleration B Every action has an equal and opposite reaction C Body remains at rest or in motion D Momentum is conserved

49

Action and reaction forces act on:

A Same body B Different bodies C Same direction D Same surface

50

Which of the following is an example of action-reaction pair?

A Weight and mass B Push on wall and wall pushing back C Friction and gravity D Speed and velocity

51

Why does a gun recoil when a bullet is fired?

A Due to gravity B Due to friction C Due to Newton’s Third Law D Due to inertia

52

Which law explains motion of rockets?

A First law B Second law C Third law D Law of gravitation

53

Momentum of a body depends on:

A Mass only B Velocity only C Mass and velocity D Force and mass

54

Formula of momentum is:

A p = mv B p = ma C p = m/v D p = v/m

55

SI unit of momentum is:

A kg m s⁻¹ B kg m s⁻² C N s⁻¹ D J s

56

Impulse is equal to:

A Force × distance B Force × time C Mass × acceleration D Momentum ÷ time

57

Impulse is equal to change in:

A Force B Velocity C Momentum D Mass

58

Unit of impulse is:

A Newton B Newton second C Joule D Watt

59

Which of the following increases impulse?

A Decreasing time B Increasing time C Decreasing force D Decreasing momentum

60

Why are airbags used in cars?

A To increase speed B To decrease force by increasing time C To reduce mass D To stop motion instantly

61

Principle of conservation of momentum states that:

A Momentum always increases B Momentum is lost in collisions C Total momentum remains constant D Momentum depends on force

62

A body is in equilibrium when its:

A acceleration is zero. B speed is zero. C velocity is non-uniform. D displacement is zero.

63

A couple is formed by:

A two forces perpendicular to each other. B two equal and opposite forces not in the same line. C two equal and opposite forces in the same line. D two unequal forces.

64

The vertical or perpendicular component of a force F making an angle θ with the horizontal x-axis is given by:

A F cos(θ) B F tan(θ) C F sin(θ) D F cot(θ)

65

The turning effect of a force is called:

A Momentum B Pressure C Work D Torque

66

The centre of gravity of an irregularly shaped thin lamina can be found using a:

A Plumb line B Screw gauge C Vernier callipers D Metre rule

By Chapter Chapter 3: Dynamics – I + Chapter 4: Dynamics – II