(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Physics

A body starts with an initial velocity of 10m s^-1 and acceleration 5 m s^-2. Find the distance covered by it in 5 s.

When brakes are applied to a bus, retardation produced is 25 cm s^-2 and the bus takes 20 s to stop. Calculate -

1. The initial velocity of the bus
2. The distance travelled by bus during this time.

A car travels a distance 100 m with constant acceleration and average velocity of 20 ms^-1. The final velocity acquired by the car is 25 ms^-1.

Find

(i) The initial velocity.

(ii) Acceleration of the car.

State Newton's first law of motion.

Give qualitative definition of force on the basic of Newton's first law of motion.

Explain the following :
After alighting from a moving bus , one has to run for some distance in the direction of bus in order to avoid falling .

How does Newton's second law of motion differ from the first law of motion?

State the laws of reflection and describe an experiment to verify them.

According to the law of reflection :

State the direction of incident ray which after reflection from a spherical mirror retraces its path. Give a reason to your answer. 

Describe a simple experiment which demonstrates that the sound produced by a tuning fork is due to vibrations of its arms.

Choose the correct word/words to complete the following sentence :   

When sound travels in a medium ____________