English Medium कक्षा ९ - CBSE Question Bank Solutions for Science

Name the physical quantity which gives us an idea of how slow or fast a body is moving.

In addition to speed, what else should we know to predict the position of a moving body ?

Under which condition is the magnitude of average velocity equal to average speed ?

What is the SI unit of retardation ?

Fill in the following blank with suitable word:

The physical quantity which gives both, the speed and direction of motion of a body is called its……………

State whether speed is a scalar or a vector quantity. Give reason for your choice.

Bus X travels a distance of 360 km in 5 hours whereas bus Y travels a distance of 476 km in 7 hours. Which
bus travels faster ?

Arrange the following speed in increasing order (keeping the least speed first): 

An athlete running with a speed of 10 m/s.

Arrange the following speed in increasing order (keeping the least speed first):

A bicycle moving with a speed of 200 m/min.

Arrange the following speed in increasing order (keeping the least speed first

A scooter moving with a speed of 30 km/h.

Write the formula for acceleration. Give the meaning of each symbol which occurs in it.

A train starting from Railway Station attains a speed of 21 m/s in one minute. Find its acceleration.

A snail covers a distance of 100 metres in 50 hours. Calculate the average speed of snail in km/h.

A tortoise moves a distance of 100 metres in 15 minutes. What is the average speed of tortoise in km/h ?

If a sprinter runs a distance of 100 metres in 9.83 seconds, calculate his average speed in km/h.

A motorcyclist drives from place A to B with a uniform speed of 30 km h^-1 and returns from place B to A with a uniform speed of 20 km h^-1. Find his average speed.

A motorcyclist starts from rest and reaches a speed of 6 m/s after travelling with uniform acceleration for 3 s. What is his acceleration ?

An aircraft travelling at 600 km/h accelerates steadily at 10 km/h per second. Taking the speed of sound as 1100 km/h at the aircraft’s altitude, how long will it take to reach the ‘sound barrier’ ?

If a bus travelling at 20 m/s is subjected to a steady deceleration of 5 m/s², how long will it take to come to rest ?

Convert a speed of 54 km/h into m/s.