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Physical Science Class 9


Chapter 1  Motion and Time 

Question 1
A train accelerates from 36 km/h to 54 km/h in 10 sec.
(i) Acceleration
(ii) The distance travelled by car.

Question 2
A body whose speed is constant
(a) Must be accelerated
(b) Might be accelerated
(c) Has a constant velocity
(d) Cannot be accelerated.

Question 3
A truck travelling at 54 km/h is slow down to 36 km/h in 10 sec. Find the retardation

Question 4
A particle is moving in a circle of diameter 20 m in 60 seconds. What will it's distance in 140 second?

Question 5
A scooter travelling at 10 m/s speed up to 20 m/s in 4 sec. Find the acceleration of scooter.
 
Question 6
A train starts from rest and accelerate uniformly at the rate of 5 m/s2 for 5 sec. Calculate the velocity of train in 5 sec.

Question 7
A object moves with uniform positive acceleration. Its velocity-time graph will be what kind of nature ? Draw it's graph.

Question 8
The maximum speed of a train is 90 km/h. It takes 10 hours to cover a distance of 500 km. Find the ratio of its average speed to maximum speed?

Question 9
A car start from rest and acquire a velocity of 54 km/h in 2 sec. Find
(i) the acceleration
(ii) distance travelled by car assume motion of car is uniform?

Question 10
An object dropped from a cliff falls with a constant acceleration of 10 m/s2. Find its speed 5 s after it was dropped.

Question 11
A ball is thrown upwards and it goes to the height 100 m and comes down
1) What is the net displacement?
2) What is the net distance?

Question 12
Two cars A and B race each other. The Car A ran for 2 minute at a speed of 7.5 km/h, slept for 56 minute and again ran for 2 minute at a speed of 7.5 km/h. find the average speed of the car A in the race.

Question 13
Anand leaves his house at 8.30 A.M for his school. The school is 2 km away and classes start at 9.00 A.M. If he walks at a speed of 3 km/h for the first kilometre, at what speed should he walk the second kilometre to reach just in time?

Question 14
An object moves along a straight line with an acceleration of 2 m/s2. If its initial speed is 10 m/s, what will be its speed 2 s later?

Question 15
A bullet hits a Sand box with a velocity of 20 m/s and penetrates it up to a distance of 6 cm. Find the deceleration of the bullet in the sand box.

Question 16
A particle experiences constant acceleration for 20 seconds after starting from rest. If it travels a distance D1 in the first 10 seconds and distance D2 in the next 10 seconds then what? 

Question 17
The velocity -time graph of SUV is given below. The mass of the SUV is 1000 kg.

a. What is the distance travelled by the SUV is first 2 seconds?
b. What is the braking force at the end of 5 seconds to bring the SUV to a stop within one seconds?

Question 18
An electron moving with a velocity of 5 × 10³ m/s enters into a uniform electric field and acquires a uniform acceleration of 103m/s²
 in the direction of initial velocity.
i. Find out the time in which electron velocity will be doubled.?
ii. How much distance electron would cover in this time.?

Question 19
A train 100 m long is moving with the velocity of 72 km/hr. Find the time it takes to cross the bridge which is 2 km long?

Question 20
An artificial satellite is moving in a circular orbit of radius 42.250 km (approx). Calculate its linear velocity if takes 24 hour to revolve around earth.?

Question 21
The velocity-time graph shows the motion of a cyclist. Find
(i) its acceleration
(ii) its velocity
(iii) the distance covered by the cyclist in 15 seconds?

Question 22
An object starting from rest travels 20 m in first 2 s and 160 m in next 4 s.What will be the velocity after 7 s from the start?

Question 23
An object travels 20 m in 2 s and then another 16 m in 2 s. What is the average speed of the object?

Question 24
The distance moved and the magnitude of displacement are equal in ?
(a) The earth is revolving around the Sun
(b) Object moving in circular path
(c) The pendulum is moving to and fro
(d) Object moving on straight road

Question 25
A car travelling at speed 72km/hr suddenly applies the brake with the deceleration of 5m/s2. Find the stopping distance of the car

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