Quiz: Chapter 2 - Force And Motion

1 Distance covered by a freely falling body in 2 seconds will be?

4.9 m 19.6 m 39.2 m 9.8 m

2 1st law of motion gives definition of?

Mass Inertia Force Momentum

3 A 7.0 Kg ball experiences a net force of 7.0 N. What will be its acceleration?

10 m/s² 5 m/s² 1 m/s² 35 m/s²

4 An object with a constant speed?

Is not accelerated Might be accelerated Is always accelerated Also has a constant velocity

5 The ratio of distance to magnitude of displacement when a body covers a semicircle is?

π/2 πR 1/π π/4

6 The distance travelled by a body dropped from the top of a tower is proportional to?

Mass of the body Height of the tower Weight of the body Square of the time elapsed

7 Which pair contains one scalar and one vector?

Acceleration, Force Momentum, Velocity Force, K.E Work, P.E

8 All statements are correct about third law of motion except?

Both forces have opposite direction Forces have equal magnitude Both forces are applied on different bodies Both are applied on same body maintaining equilibrium

9 If a body starts from a point and returns back to the same point then its?

Average speed is zero but not average velocity Average speed and velocity depends on the path Both average speed and velocity are zero Average velocity is zero but not average speed

10 The value of ratio of displacement to distance is?

Always one Always less than one More than one Equal or less than one

11 At which angle (between F and V) when a force acts on a moving object, such that it produces acceleration at constant speed?

0° 45° 180° 90°

12 Equations of motion are applicable for?

Uniform acceleration Variable force Variable acceleration Any of these

13 If R is the maximum horizontal distance of projectile then the greatest height attained by projectile in this condition?

R R/2 2R R/4

14 Range of projectile is R when angle of projection is 60°, then the value of other angle of projection for same range is?

40° 30° 50° 20°

15 During projectile motion the quantities that remain constant are?

Acceleration, V_x Force, Velocity Acceleration, K.E Acceleration, Momentum

16 The path of projectile is?

Hyperbola Straight line Parabola Ellipse

17 Motion of projectile is ______ dimensional?

One Three Two Four

18 Which component of the velocity of projectile remains constant throughout the motion?

V_x V_y a_x a_y

19 At which angle when a projectile is launched R=H?

45° 30° 76° 60°

20 The angle between velocity of projectile and acceleration at the highest point becomes?

90° 180° 0° 76°

21 A collision in which K.E of system remains constant is called?

Elastic collision Inelastic collision Partially elastic collision Any of these

22 A bullet is shot from a rifle. As a result, the rifle recoils. The momentum of rifle as compared to that of the bullet is?

Less Greater Equal Cannot be concluded

23 A force of 100 N acts on a body of mass 10 Kg such that its velocity changes from V₁ to V₂ in 20 s then the rate of change of momentum will be equal to?

100 N Greater than 100 N Less than 100 N Zero

24 SI unit of impulse is same as of?

Force Time Momentum Torque

25 A body is projected with Kinetic Energy K at angle of 60° with the horizontal. Its Kinetic energy at the highest point of its trajectory will be?

2K K K/2 K/4

26 The speed of projectile at maximum height is half of its initial speed v then its angle of projection is?

30° 60° 45° 90°

27 Displacement of an object in moving around a complete circle is?

2r 2πr Zero πr

28 An object moves 20 m towards east and then 10 m towards west, in 5 sec. What is its average velocity and average speed?

speed = 6 m/s velocity = 6 m/s speed = 2 m/s velocity = 6 m/s speed = 2 m/s velocity = 2 m/s speed = 6 m/s velocity = 2 m/s

29 What is the FPS unit of displacement?

Kilometer Pound Foot Meter

30 Projectile motion is not dependent on the ______ of particle?

Acceleration Launch angle Initial Velocity Mass

31 Centrifugal force is a?

Friction force Real force Pseudo force None

32 When the distance travelled by a body is proportional to the time taken. What happens to its speed?

Becomes zero Remains the same Increases Decreases

33 1 Newton = ______?

1 kg × 1 m/s² 1 kg 1 kg × 1 m/s 1 kg × 1 ms

34 Taking off rocket can be explained by?

Law of conservation of Energy Law of conservation of Momentum 1st law of motion 2nd law of motion

35 Which of the following pair has same direction always?

Force, displacement Force, velocity Force, acceleration Force, momentum

36 When velocity-time graph is a straight line parallel to time axis then?

Acceleration is constant Acceleration is variable Acceleration is zero Velocity is zero

37 Which of the following is conserved in all types of collisions?

Momentum Total Energy Kinetic Energy Both A & B

38 An aircraft is moving along a straight path with constant velocity, its acceleration will be?

Zero Constant Maximum Uniform

39 If the initial velocity of the projectile is doubled then the maximum height of the projectile will become?

Double 4 times Half None

40 The range of projectile is same for angles of projection?

30° and 45° 45° and 60° 50° and 45° 30° and 60°

41 A car covers 2/3 distance with 60 km/hour and 1/3 distance with 20 km/hour. The average speed of car is?

36 km/hour 56 km/hour 46 km/hour 66 km/hour

42 At maximum height, what is the angle between velocity and acceleration vectors?

0° 45° 90° 180°

43 At which angle when a projectile is launched H=R/4?

30° 45° 76° 60°

44 A ball is thrown with a force from the top of tower. The acceleration of the ball immediately after leaving the hand is?

Equal to g Greater than g Less than g None

45 Potential energy is maximum at the highest point of the projectile motion. If the angle is?

90° 60° 45° 30°

46 The rate of change of momentum of a freely falling body is?

Equal to weight Is less than weight Is greater than weight All of these

47 The range of projectile at 30° is R, at the angle of 60° the range will be?

R/2 R 2R R/4

48 An stone is dropped from the top of a tower. If it takes 10 seconds to hit the ground, find the height of tower?

280 meters 310 meters 390 meters 490 meters

49 A car starts from rest and moves with constant acceleration. During the 5th second of its motion it covers a distance of 36 meters. What is the acceleration of the car?

12.5 m/s² 8 m/s² 15 m/s² 16 m/s²

50 The velocity-time plot for a particle moving on a straight line shows a straight line. What does this imply?

The particle has constant acceleration The particle has never turned around The particle has zero displacement Data is insufficient

51 A ball thrown vertically upwards will have constant ______ and a varying ______.

Velocity and acceleration Kinetic energy, velocity Acceleration, velocity Kinetic energy and acceleration

52 If the distance covered by a particle is zero then what can we say about its displacement?

It is negative It may or may not be zero It must be zero It cannot be zero

53 The area under the acceleration-time graph represents:

Displacement Velocity Change in velocity Distance traveled

54 If a moving object has no force acting on it:

It will decelerate and eventually stop Continue to move in a straight line at constant velocity It will stop immediately Its velocity will increase while moving in a straight line

55 Measure of displacement covered with passage of time is called:

Acceleration Speed Velocity Deceleration

56 A body covers displacement of 10m towards north and returns back to initial point by covering 10m towards south, its total displacement is:

20m north 10m south 0m along north-south 0m

57 The net displacement divided by the total time (t) is known as:

Instantaneous velocity Uniform velocity Average velocity Variable velocity

58 The velocity-time graph of a motion starting from rest with uniform acceleration is a straight line:

Not passing through origin Parallel to time axis Parallel to velocity axis Passing through origin

59 Under what condition will an object have zero displacement but non-zero distance?

Linear motion Circular motion Random motion None of these

60 The slope of a distance-time graph will always be:

Negative Positive Zero Maximum

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Chapter 2: Force And Motion