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

Give four reasons, why the use of cowdung in biogas preferred to burning of cowdung cakes.

Multiple choice Question. Select the correct option.

A driver applies brakes when he sees a child on the railway track, the speed of the train reduces from 54 km/h to 18 km/h in 5 s. What is the distance travelled by train during this interval of time?

A boy drops a stone from a cliff, reaches the ground in 8 seconds. Calculate

1. final velocity of stone
2. height of cliff. (Take g = 9.8 ms⁻²)

A stone thrown vertically upwards takes 4 s to return to the thrower. Calculate

1. initial velocity of the stone
2. maximum height attained by stone. (Take g = 10 ms⁻²)

A spaceship is moving in space with a velocity of 50 kms⁻¹. Its engine fires for 10 s, such that its velocity increases to 60 kms⁻¹. Calculate the total distance travelled by a spaceship in 1/2 minute, from the time of firing its engine

Derive the equations
(i) v= u+at and
(ii) v²-u²= 2as, where the symbols have their usual meanings.

Derive the equation
V²-u² = 2as

A car moving with a uniform acceleration of 10 m/s² on a straight road changes its speed from 10 m/s to 30 m/s. Find the time lapsed for the change of speed.

A body starts to slide over a horizontal surface with an initial velocity of 0.5 ms⁻¹. Due to friction, its velocity decreases at the rate of 0.05 ms⁻². How much time will it take for the body to stop?

A train is moving at a speed of 90 km/h. On applying brakes, a retardation of 2.5 ms^-2 is created. At what distance before, should the driver apply the brakes to stop the train at the station?

Name the instrument which has the least count

1 mm

A microscope has its main scale with 20 divisions in 1 cm and vernier scale with 25 divisions, the length of which is equal to the length of 24 divisions of main scale. The least count of microscope is

A stopwatch has 10 divisions graduated between the 0 and 5 s marks. What is its least count?

A vernier has 10 divisions and they are equal to 9 divisions of the main scale in length. If the main scale is calibrated in mm, what is its least count?

A microscope is provided with a main scale graduated with 20 divisions in 1 cm and a vernier scale with 50 division on it of length same as of 49 divisions of main scale. Find the least count of the microscope.

The main scale of a vernier callipers is calibrated in mm and 19 divisions of main scale are equal in length to 20 divisions of the vernier scale. In measuring the diameter of a cylinder by this instrument, the main scale reads 35 divisions and 4th division of vernier scale coincides with a main scale division. Find

(i) Least count and (ii) Radius of a cylinder.

Define the terms : oscillation

What do you understand by amplitude of simple pendulum?

Name two factors on which the time period of a simple pendulum depends. Write the relation for the time period in terms of the above named factors.

How does the time period (T) of a simple pendulum depend on its length (l)? Draw a graph showing the variation of T² with l. How will you use this graph to determine the value of g (acceleration due to gravity)?