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

State and explain Pascal's law of transmission of pressure.

The density of iron is 7800 kg m^-3. What do you mean by this statement? What is density of water at 4⁰C?

For what purpose is the acid battery hydrometer used?

Define acceleration. State its unit.

Distinguish between acceleration and retardation.

What is meant by the term retardation? Name its S.I. unit.

Give one example of the following motion:

Uniform retardation

Define the term acceleration due to gravity. State its average value.

The unit of retardation is ____________

A body is moving vertically upwards. Its velocity changes at a constant rate from 50 m s⁻¹ to 20 m s⁻¹ in 3 s. What is its acceleration?

A toy car initially moving with uniform velocity of 18 km h^-1 comes to a stop in 2 s. Find the retardation of the car in S.I. units.

State the type of motion represented by the following sketches in Figures.

Give an example of each type of motion.

Figure shows the velocity-time graphs for two cars A and B moving in the same direction. Which car has greater acceleration? Give reasons to your answer.

The velocity-time graph for a uniformly retarded body is a straight line inclined to the time axis with an obtuse angle. How is retardation calculated from the velocity-time graph?

Draw a graph for acceleration against time for a uniformly accelerated motion. How can it be used to find the change in speed in a certain interval of time?

A body falls freely from a certain height. Show graphically the relation between the distance fallen and square of time. How will you determine g from this graph?

Figure given below shows a velocity-time graph for a car starting from rest. The graph has three parts AB, BC and CD.

(a) Is the magnitude of acceleration higher or lower than that of retardation ? Give a reason .
(b) Compare the magnitude of acceleration and retardation .

Figure given below shows a velocity-time graph for a car starting from rest. The graph has three parts AB, BC and CD.

Which part of graph shows motion with uniform
(a) velocity (b) acceleration (c) retardation ?

A bullet initially moving with a velocity 20 m/s strikes a target and comes to rest after penetrating a distance 10 cm into the target. Calculate the retardation caused by the target.

A train moving with a velocity of 20 ms⁻¹ is brought to rest by applying brakes in 5 s. Calculate the retardation.