(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Physics

1. Name one factor on which the frequency of sound emitted due to vibrations in an air column depends.
2. How does the frequency depend on the factor stated in part (a).

State one way of increasing the frequency of a note produced by an air column.

State two ways of increasing the frequency of vibrations of a stretched string.

Explain why strings of different thicknesses are provided on a stringed instrument.

[Hint: Natural frequency of vibration of a stretched string is inversely proportional to the radius (or thickness) of string so notes of different frequencies can be produces by vibrating different strings.]

A blade, fixed at one end, is made to vibrate by pressing its other end and then releasing it. State one way in which the frequency of vibrations of the blade can be lowered.

A wire stretched between two fixed supports, is plucked exactly in the middle and then released. It executes (neglect the resistance of the medium) ______.

What is a gear system ?

Explain the working of a gear system.

Explain how a gear system can be used to obtain gain in speed? Given one example.

Explain how a gear system can be used to obtain gain in torque? Given one example.

Explain how a gear system can be used to obtain Change in direction of rotation. Given one example.

Define the following term in reference to a gear system of Driving gear ?

Define the following term in reference to a gear system for Driven gear ?

Define the following term in reference to a gear system for Gear ratio ?

Define the following term in reference to a gear system for Gain in speed ?

Define the following term in reference to a gear system for Gain in torque ?

What should be the gear ration of a car : equal to 1, less than 1 or greater than 1, while gaining speed on the road ?

What should be the gear ration of a car : equal to 1, less than 1 or greater than 1, while ascending a hill ?

In a gear system, the gear ration of the driving wheel A and driven wheel B is 10:1. To rotate the driven wheel B in the direction of driving wheel A, the driving wheel A is engaged with other wheel C. what should be the gear ratio of the wheels A and C?

What is a single movable pulley? What is its mechanical advantage in the ideal case?