Light Energy — PHYSICS STD 7 — Question

A fixed temperature at which a solid changes into liquid state is called ___________ point.

A pair of colours which on mixing produce white colour are called _________ colours.

The distance covered by a body in unit time in a specified direction is called ___________.

Still air is an __________ of heat.

The repetition of sound produced due to the reflection of sound waves from a reflecting surface is known as an _____________

Mud houses with thatched roofs keep ___________ in summer compared to the concrete houses.

The strength of the magnetic field of an electromagnet is increased by inserting a core of soft ______

The SI unit of frequency is __________

When a body covers equal distances in equal interval of ___________ in a specified direction, it is said to be moving with uniform velocity.