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

Parallel rays are incident:

1. on regular surface and
2. on irregular surface. In what respect do reflected rays in (1) differ from those of (2)?

Write down the letters of the word ‘POLEX’ as seen in a plane mirror, held parallel to the plane of this paper.

Select the correct option:

A ray of light is incident on a concave mirror. If it is parallel to principal axis, the reflected ray will:

Select the correct option:

In case of concave mirror, the minimum distance between an object and its real image is:

Select the correct option:

If an incident ray passes through the centre of curvature of a spherical mirror, the reflected ray will:

State briefly, how and why the atmospheric pressure of a place varies with the altitude. Draw an approximate graph to illustrate this variation.

State two advantages of an aneroid barometer.

Explain, why steel is used in preference to soft iron for making permanent magnets while soft iron is used in preference to steel for making electromagnets.

A hollow metal cylinder of length 10 cm floats in alcohol of density 0.80 g cm^-3, with 1 cm of its length above it. What length of cylinder will be above copper sulphate solution of density 1.25 g cm^-3?

What fraction of metal of density 3400 kgm^-3 will be above the surface of mercury of density 13600 kgm^-3, while floating in mercury?

A test tube weighing 17 gf, floats in alcohol to the level P. When the test tube is made to float in water to the level P, 3 gf of the lead shots are added in it. find the R.D. of alcohol.

A test tube loaded with lead shots, weighs 150 gf and floats upto the mark X in water. The test tube is then made to float in alcohol. It is found that 27 gf of lead shots have to be removed, so as to float it to level X. Find R.D. of alcohol.

Why does a ship make of iron not sink in water, while an iron nail sinks in it?

A test tube loaded with lead shots weighs 25 gf and floats upto the mark X in water. When the test tube is made to float in brine solution, it needs 5 gf more of lead shots to float upto level X. Find the relative density of brine solution.

A rubber ball floats in water with 2/7 of its volume above the surface of the water. Calculate the average relative density of the rubber ball.

A cube of ice whose side is 4.0 cm is allowed to melt. The volume of water formed is found to be 58.24 cm³. Find the density of ice.

A block of wood of volume 25 cm³ floats in water with 20 cm³ of its volume immersed in water.
Calculate:
(1) density of wood
(2) the weight of block of wood.

Identify the following kind of beam of light.