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

Give one example of following motion :

Variable acceleration

If a stone and a pencil are dropped simultaneously in vacuum from the top of a tower, then which of the two will reach the ground first? Give reason.

A body starts from rest and acquires a velocity 10 m s^-1 in 2 s. Find the acceleration.

A car starting from rest acquires a velocity 180m s^-1 in 0.05 h. Find the acceleration.

A bicycle initially moving with a velocity 5.0 m s^-1 accelerates for 5 s at a rate of 2 m s^-2. What will be its final velocity? 

State how the velocity-time graph can be used to find

The acceleration of a body

The figure shows the displacement - time graph for four bodies A, B C and D. In each case state what information do you get about the acceleration (zero, positive or negative).

The velocity-time graph of a body in motion is a straight line inclined to the time axis. The correct statement is ___________

For a uniformly retarded motion, the velocity-time graph is _____________

Write three equations of uniformly accelerated motion relating the initial velocity (u), final velocity (v), time (t), acceleration (a) and displacement (S).

Derive the following equations for uniformly accelerated motion: 

(i) v = u + at 

(ii) `"S = ut" + 1/2 "at"^2`

(iii) v² = u² + 2aS

where the symbols have their usual meanings.

A body, initially at rest, starts moving with a constant acceleration 2 m s^-2. Calculate: (i) the velocity acquired and (ii) the distance travelled in 5 s.

What is geothermal energy? Explain in brief.

Explain how geothermal energy is used in generating electricity.

What do you understand by the term acceleration?

When is the positive acceleration?

When is the negative acceleration?

Multiple choice Question. Select the correct option.

A body dropped from the top of a tower reaches the ground in 4s. Height of the tower is

Multiple choice Question. Select the correct option.

The speed of a car reduces from 15 m/s to 5 m/s over a displacement of 10 m. The uniform acceleration of the car is :

Multiple choice Question. Select the correct option.

At the maximum height, a body thrown vertically upwards has :