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

When is the acceleration due to gravity negative?

Give an example of an accelerated body, moving with a uniform speed.

An aluminium cube of side 5 cm and RD. 2.7 is suspended by a thread in alcohol of relative density 0.80. Find the tension in thread.

A cube of the lead of side 8 cm and R.D. 10.6 is suspended from the hook of a spring balance. Find the reading of spring balance. The cube is now completely immersed in sugar solution of R.D. 1.4. Calculate the new reading of spring balance.

The change in velocity of a motorbike is 54 kmh⁻¹ in one minute. Calculate its acceleration in (a) ms⁻² (b) kmh⁻².

A cylinder made of copper and aluminium floats in mercury of density 13.6 gem^-3, such that 0.26th part of it is below mercury. Find the density of solid.

An iceberg floats in sea water of density 1.17 g cm ³, such that 2/9 of its volume is above sea water. Find the density of iceberg.

Draw velocity – time graph for the following situation:

When a body is moving with variable velocity, but uniform retardation.

Draw velocity – time graph for the following situation:

When a body is moving with variable velocity and variable acceleration.

A solid weighs 105 kgf in air. When completely immersed in water, it displaces 30,000 cm³ of water, calculate relative density of solid.

A racing car is moving with a velocity of 50 m/s. On
applying brakes, it is uniformly retarded and comes to rest in 20 seconds. Calculate its acceleration.

From the diagram given below, calculate acceleration.

From the diagram given below, calculate deceleration.

From the velocity – time graph given below, calculate deceleration in region BC.

Diagram is given below shows velocity – time graph of car P and Q, starting from the same place and in the same direction. Calculate the Acceleration of car P.

Diagram is given below shows velocity – time graph of car P and Q, starting from the same place and in the same direction. Calculate the Acceleration of car Q between 2 s – 5 s.

A motorbike, initially at rest, picks up a velocity of 72 kmh⁻¹ over a distance of 40 m. Calculate

1. acceleration
2. time in which it picks up above velocity.

A cyclist driving at 5 ms^−1, picks a velocity of 10 ms⁻¹, over a distance of 50 m. Calculate

1. acceleration
2. time in which the cyclist picks up above velocity.

An aeroplane lands at 216 kmh⁻¹ and stops after covering a runway of 2 m. Calculate the acceleration and the time, in which it comes to rest.

A truck running at 90 kmh⁻¹, is brought to rest over a distance of 25 m. Calculate the retardation and time for which brakes are applied.