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SCIENCE (IX) MOTION |
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MULTIPLE CHOICE QUESTIONS
(MCQs) |
|
1 |
A physical quantity which cannot be negative is: (a) displacement (b) velocity (c) acceleration (d) distance |
1 |
|
2 |
The numerical ratio of displacement to distance for a moving object
is: (a) always less than 1 (b) always more than 1 (c) always equal to 1 (d) equal or less than 1 |
1 |
|
3 |
When an object travels equal distances in equal intervals of time,
howsoever small the interval may be, the motion of the object is said to be: (a) uniform (b) circular motion (c) non-uniform (d) oscillatory motion |
1 |
|
4 |
If an object is moving with constant velocity, then the motion is: (a) speed (b) uniform acceleration (c) uniform motion (d) non-uniform motion |
1 |
|
5 |
When a body covers unequal distances in equal intervals of time, it
is said to be in: (a) linear motion (b) uniform motion (c) non-uniform motion (d) vibratory motion |
1 |
|
6 |
Displacement-time graph of a uniformly accelerated motion is: (a) parabola (b) an Inclined line (c) straight line (d) None of these |
1 |
|
7 |
Slope of a velocity-time graph gives:
(b) the displacement (c) the acceleration (d) the speed |
1 |
|
8 |
Area under velocity-time graph gives: (a) displacement (b) velocity (c) acceleration (d) time |
1 |
|
9 |
What is the SI unit of acceleration? (a) m (b) m/s (c) m/s2 (d) ms2 |
1 |
|
10 |
Acceleration is a vector quantity which indicates that its value:
always positive (a) is always negative (b) is zero (c) can be positive, negative or zero (d) is always positive |
1 |
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ASSERTION AND REASON QUESTIONS
(a) Both Assertion (A) and
Reason (R) are true and Reason (R) is the correct explanation of the
Assertion (A). (b) Both Assertion (A) and
Reason (R) are true and Reason (R) is not the correct explanation of the
Assertion (A). (c) Assertion (A) is true, and
Reason (R) is false. (d) Assertion (A) is false,
and Reason (R) True. |
|
11 |
Assertion (A): When an
object changes its position while moving, it gets displaced. Reason (R): Displacement
is the shortest distance between the initial and final position of the moving
object. |
1 |
|
12 |
Assertion (A): Motion with
uniform velocity is always along a straight line path. Reason (R): In uniform
velocity, speed is the magnitude of the velocity and is equal to the
instantaneous velocity. |
1 |
|
13 |
Assertion (A): The
position-time graph of a uniform motion in one dimension of a body can have
negative slope. Reason (R): When the speed
of body decreases with time, the position-time graph of the moving body has
negative slope. |
1 |
|
14 |
Assertion (A): A particle
can have acceleration even, if its velocity is zero at an instant. Reason (R): Acceleration
Is the rate of change of velocity. |
1 |
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VERY SHORT ANSWER QUESTIONS |
|
15 |
A boy hits a football high up in the air. He runs and catches the
football before it hits the ground. Which of the two, the boy or the
football, has had a greater displacement? |
2 |
|
16 |
Distinguish between distance and displacement. |
2 |
|
17 |
What is meant by uniform motion? Can you think of an example of a
body in uniform motion? |
2 |
|
18 |
Usha swims in a 90 m long pool. She covers 180 m in one minute by
swimming from one end to the other and back along the same straight path.
Find the average speed of Usha. |
2 |
|
19 |
The odometer of a car reads 2000 km at the start of a trip and 2400
km at the end of the trip. If the trip took 8 h, calculate the average speed
of the car in km h-1 and m s-1. |
2 |
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SHORT ANSWER TYPE QUESTIONS |
|
20 |
A car starts from rest and attains a velocity of 10 m s¹ in 40 s. The
driver applies brakes and slows down the car to 5 ms-¹ in 10s. Find the
acceleration of the car in both the cases. |
3 |
|
21 |
Give one example each to differentiate between uniform acceleration
and non-uniform acceleration. |
3 |
|
22 |
What is the difference between uniform motion In а straight line and
uniform circular motion? |
3 |
|
23 |
A car moves with a speed of 30 km h-¹ for half an hour, 25 km h¹ for
one hour and 40 km h-1 for two hours. Calculate average speed of the car. |
3 |
|
24 |
A driver applies the brakes and slows down the velocity of the bus
from 80 km h-1 to 60 km h-1 in 5 s. Calculate the
acceleration of the bus. |
3 |
|
25 |
Derive the second equation of motion. |
3 |
|
26 |
A car starts from rest and acquires a velocity of 54 km h-1
in 2 minutes. Find: (i) the acceleration (ii) distance travelled by the car during this time. Assume, motion
of the car is uniform. |
3 |
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LONG ANSWER TYPE QUESTIONS |
|
27 |
Derive the first equation of motion by graphical method. |
5 |
|
28 |
Derive the second equation of motion by graphical method. |
5 |
|
29 |
Derive the third equation of motion by graphical method. |
5 |
|
30 |
Starting from a stationary position, Rahul paddles his bicycle to
attain a velocity of 6 m s-1 in 30 s. Then he applies brakes such
that the velocity of the bicycle comes down to 4 m s-1 in the next
5s. Calculate the acceleration of the bicycle in both the cases. |
5 |
|
31 |
A child drops a ball from a height of 10 m. Assume that its velocity
increases uniformly at а rate of 10 m s-2, Find: (i) the velocity with which the ball strikes the ground (ii) the time taken by the ball to reach the ground. |
5 |
|
32 |
A car starts from rest and attains a velocity of 10 m s¹ in 40 s. The
driver apples brakes and slows down the car to 5 m s in 10 s. Find the
acceleration of the car in both the cases. |
5 |
|
33 |
(i) A driver applies the brakes and slows down the velocity of the
bus from 80 km h-1 to 60 km h-1 in 5 s. Calculate the
acceleration of the bus. (ii) A train travels the first 30 km of 120 km track with a uniform
speed of 30 km h-1. What should be the speed of the train to cover
the remaining distance of the track so that its average of the track so that
its average speed is 60 km h-1 for the entire trip? |
5 |
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CASE BASED STUDY QUESTIONS |
|
34 |
Read the passage carefully and answer the
following questions: Priya
walks 1.5 km towards the north in 30 minutes and then returns to her starting
point in the next 30 minutes. 1. What is
the total distance Priya walked? 2. What is
her displacement? 3. What is
her average speed? 4. What is
her average velocity? 5. Explain
the reason for the difference between speed and velocity in this case. |
4 |
|
35 |
Read the passage carefully and answer the
following questions: Ravi
boarded a train from Delhi to Kanpur. The train covered the first 100 km in 2
hours, the next 150 km in 3 hours, and the last 50 km in 1 hour. The train
stopped twice for 15 minutes each. He noted the times and distances to
analyze the motion of the train. 1. What is
the total distance covered by the train? 2. What is
the total time taken including halts? 3.
Calculate the average speed of the train. 4.
Identify the type of motion (uniform or non-uniform) and justify your answer. 5. If the
train had not stopped, what would have been the average speed? |
4 |
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