ICSE ICSE Class 7 - CISCE Question Bank Solutions for Physics

State one use of reflection of sound.

What is echo ?

Write true or false of the following statement.

The speed of light in vacuum is 3 × 10⁸ ms^-1.

Select the correct alternative

The speed of light is maximum in

State the speed of light in (a) air, (b) glass.

State whether light slows down or speeds up in the following cases :

 Light going from air to glass.

State whether light slows down or speeds up in the following cases :

Light going from glass to water.

State whether light slows down or speeds up in the following cases :

Light going from water to air.

Write true or false of the following statement.

A rose appears red in light of all the colours.

Write true or false of the following statement.

A black paper absorbs light of all the colours and reflects none.

Write true or false of the following statement.

The primary colours are red, blue and green.

Fill in the blank 

The colour of an opaque object is the colour of light which it _______

 Fill in the blank

Magenta, cyan and yellow are the ________ colours.

A red rose is seen in green light. It will appear ______.

 Select the correct alternative

The primary colours are

What are the primary colours ? Name the three primary colours.

What are the secondary colours ? Name the three secondary colours.

Fill in the blank with the appropriate colour

 Blue + _______ = Cyan

Fill in the blank with the appropriate color

Red + Blue + _______ = White

Fill in the blank with the appropriate colour

Red + Blue = _______