Question Bank for 9th Class Science Time and Motion Case Based MCQs - Motion

Read the following and answer questions from [1] to [5].

The distance travelled by a body is the actual length of the path covered by it, irrespective of the direction in which body travels. It is a scalar quantity.

The displacement of a body is the change in the position of the object when it moves from a given position to another position. It is equal to the length of the shortest path measured in the direction from the initial position to the final position of the object. It is a vector quantity.

In the figure given below,

In moving from C to B, two paths are possible, CAB and CB, where, CAB is the distance covered and CB is the displacement of object.

Choose the correct statement.

A)

The displacement can be greater than distance when the path of motion is circular.

B)

The displacement can never be greater than distance. It can either be less than or equal to distance.

C)

The displacement can be greater than distance when the path of motion is parabolic.

D)

The displacement of an object is always equal to the distance travelled by it.

View Solution

2)

Displacement of a body can be

A)

positive

B)

negative

C)

zero

D)

AII of these

View Solution

3)

The velocity versus time graph of a body in motion is shown below. The displacement of the body will be

A)

20 m

B)

60 m

C)

80 m

D)

110 m

View Solution

4)

A particle starting from origin, moves 3 m North, 4 m East, 5 m South and then returns back to its initial position. Which of the following figures represents the path travelled by the particle?

A)

B)

C)

D)

View Solution

5)

A body travels a distance of 15 m from A to B and then moves a distance of 20 m at right angle to AB. The displacement of the body will be

A)

15m

B)

25m

C)

35m

D)

40m

View Solution

6)

Read the following and answer the questions from [6] to [10].

The distance travelled by a moving body is the actual length of the path covered by it, irrespective of the direction in which the body travels. It is a scalar quantity. Its SI unit is metre, e.g. consider the motion of an object moving along a straight path.

Speed of an object is defined as the distance travelled by it per unit time.

Speed of an obiect\[(v)=\frac{Distance\ (s)}{Time\ (t)}\]

Speed is a scalar quantity. The SI unit of speed is metre per second (m/s). The distance travelled by an object is either positive or zero, so the speed may be positive or zero but never negative.

Distance travelled by a train and time taken by it is shown in the following table

Time Distance (in km)

Which of the following graph correctly shows distance-time relationship for given data?

A)

B)

C)

D)

View Solution

7)

At which time the train is travelling at its highest speed?

A)

10:00 - 10:30

B)

10:30 - 10:40

C)

10:40 - 11:00

D)

11:15 - 11:30

View Solution

8)

What is the average speed of the train?

A)

33.33km/h

B)

3.33km/h

C)

33.33m/s

D)

3.33m/s

View Solution

9)

At what distance does the train slow down?

A)

Between 30 km and 32 km

B)

Between 40 km and 42 km

C)

Between 38 km and 40 km

D)

Between 50 km and 52 km

View Solution

10)

Find the speed of train between 10:40 AM to 11:00 AM.

A)

6km/h

B)

12km/h

C)

20km/h

D)

36km/h

View Solution

11)

Read the following and answer the questions from [11] to [15].

A body is said to have a uniform motion, if it travels equal distances in equal intervals of time, no matter how small these intervals may be. The distance travelled by an object in uniform motion increases linearly.

A train travels from one station to the next. The driver of train A starts from rest at time t = 0 and accelerates uniformly for the first 20 s. At time t = 20 s, train reaches its top speed of 25 m/s, then travels at this speed for further 30 s before decelerating uniformly to rest. Total time for the journey of train A is 60 s.

Another train B is travelling in the parallel of train A with zero initial speed at t = 0 and then accelerates uniformly for first 10 s.

At time t = 10 s it reaches its top speed of 30 m/s, then travels at this speed for further 20 s before decelerating uniformly to rest Total time for the journey of train B is 80 s.

The correct speed-time graph for the motion of train A is

A)

B)

C)

D)

View Solution

12)

Calculate the deceleration of train A, as it comes to rest

A)

\[25 m/{{s}^{2}}\]

B)

\[0.25 m/{{s}^{2}}\]

C)

\[2.5 m/{{s}^{2}}\]

D)

\[1 m/{{s}^{2}}\]

View Solution

13)

In which time interval, speed of train B is constant?

A)

0-10 s

B)

10 s-20 s

C)

10 s-30 s

D)

30 s-80 s

View Solution

14)

What is the initial speed of trains A and B?

A)

zero

B)

\[1m{{s}^{-1}},1m{{s}^{-1}}\]

C)

\[1m{{s}^{-1}},2m{{s}^{-1}}\]

D)

\[2m{{s}^{-1}},1m{{s}^{-1}}\]

View Solution

15)

What is the numerical ratio of average velocity to average speed of an object when it is moving along a straight path?

A)

2:1

B)

1:2

C)

2:3

D)

1:1

View Solution

16)

Read the following and answer the questions from [16] to [20].

Any change in the velocity of an object results in an acceleration by increasing speed, decreasing speed or changing direction. Yes, that's right, a change in the direction of motion results in an acceleration even if the moving object neither speed up nor slowed down. That's because acceleration depends on the change in velocity and velocity is a vector quantity; one with both magnitude and direction.

Thus, a falling apple accelerates, a car stopping at a traffic light accelerates and the moon in orbit around the Earth accelerates.

Hence, acceleration occurs anytime an object's speed increases or decreases, or it changes direction.

Acceleration can be defined as rate of change of which quantity?

A)

Displacement

B)

Velocity

C)

Momentum

D)

Inertia

View Solution

17)

Acceleration is a vector quantity. I indicates that its value can be

A)

positive, negative or zero

B)

always positive

C)

always negative

D)

zero

View Solution

18)

A falling apple accelerates. Which of the following is correct about its motion?

A)

Negative and uniform

B)

Positive and uniform

C)

Positive and non-uniform

D)

Negative and non-uniform

View Solution

19)

Which of the following is most likely not a case of uniform circular motion?

A)

Motion of the earth around the sun

B)

Motion of a toy train on a circular track

C)

Motion of a racing car on a circular track

D)

Motion of hour's hand on the dial of clock

View Solution

20)

A car accelerates uniformly from 18 km/h to 36 km/h in 5 minutes. The acceleration is

A)

\[5m{{s}^{-2}}\]

B)

\[1km{{s}^{-2}}\]

C)

\[216m{{s}^{-2}}\]

D)

\[216km{{h}^{-2}}\]

View Solution

21)

Read the following and answer the questions from [21] to [25].

If an object moves in a circular path with uniform speed, then its motion is called uniform circular motion.

When an object moves along a circular path, its direction of motion keeps changing continuously. The velocity changes due to continuous change in direction and thus motion along a circular path is said to be accelerated.

When a body takes one round of a circular path, then it travels a distance equal to its circumference which is 271 r, where r is the radius of the circular path.

Then, speed of the body moving in a circular path, \[v=2\pi r/t\], where t is the time taken for one round of circular path and n is constant having value 22/7.

An insect moves along a circular path of radius 10 cm with a constant speed. It takes 1 min to move from a point on the path to the diametrically opposite point.

The distance covered by the insect in reaching the diametrically opposite point is

A)

3.14 cm

B)

31.4 cm

C)

314 cm

D)

0.314 cm

View Solution

22)

The displacement covered in reaching B from A is

A)

10 cm

B)

5 cm

C)

20 cm

D)

zero

View Solution

23)

The speed acquired by the insect in moving the track from A to B is

A)

3.14 cm/min

B)

31.4 cm/min

C)

314 cm/min

D)

0.314 cm/min

View Solution

24)

What is the average velocity of insect in moving from A to B?

A)

10 cm/min

B)

20 cm/min

C)

30 cm/min

D)

zero

View Solution

25)

For a particle performing a uniform circular motion, the acceleration is

A)

constant in direction

B)

constant in magnitude and direction

C)

constant in magnitude but not in direction

D)

constant in neither magnitude nor in direction

View Solution

9th Class Science Time and Motion Question Bank

done Case Based MCQs - Motion Total Questions - 25

Study Package

Case Based MCQs - Motion

Case Based MCQs - Motion Total Questions - 25