Effects of Light — Science STD 7 — Question

………….. and ………….. are used for adding fragrance in soaps and incense sticks.

100 hertz is equal to hundred oscillations in ………………. .

Metals are obtained from their ore by ………….. and ………….. .

When seen from a great distance, the sky seems to be touching the ground along a circle. This circle is called the …………… .(meridian, horizon)

Work done by a body with no displacement will be …………. .

…………… is celebrated as World Soil Day.

…………… is used to measure atmospheric pressure.

Transfer of heat from one place to another takes place by ……………. or ……………. .

The region around a magnet where the magnetic force acts on an object is called the …………. .

The ……………. properties of magnetic field was proposed by scientist