Heat — PHYSICS STD 7 — Question

A region of darkness or partial light is called ___________ .

In hydroelectric dams, the kinetic energy of flowing water is transformed into___________ energy.

We use a ________ for measuring the temperature of a body.

The SI unit of frequency is ___________ .

Angle of incidence = ___________

On heating a body, its temperature _______.

Any smooth polished surface which can turn back the rays of light into the same optical medium is called ___________ .

The area of banyan leaf can be found by using___________ graph paper.

A power drill making a hole in a wooden piece describe rotatory and ___________ motion.

When a solid directly changes to gaseous state on heating, without changing to the liquid state, the gaseous material so formed is called ___________ .