Materials and Their Applications

Teflon does not permit oil or water to stick to it. Hence, this material is ideal to make non-stick vessels.

A shadow is made when an object blocks light. The object must be opaque or translucent to make a shadow. A transparent object has no shadow, as light   passes  straight through it.

Diamond is used as a material for making protective windows in space probes.

Silk scarf is obtained from silk thread, and silk thread is obtained from silk worm, which is a living thing.

Among all the options, plastic gets condensed while heating and the others expand.

Wood, glass and plastic are bad conductors of heat. Iron is a metal, which is a good conductor of heat. So ice kept in the iron box will melt the fastest.

Nickel is a magnetic substance.

Natural rubber is obtained from the milky secretion called latex of rubber plant.This milky secretion is first collected by cutting the bark of the plant and later it is used for various purposes like making tyres, eraser , etc.

Glass is transparent.

Clay is used for the preparation of flower pots.

Muslin cloth is a translucent object, i.e. partial light can pass through it.

All man-made materials are essentially non-living.

Ceramic is a man-made material.

Iron is a lustrous material. 'Lustrous' means to shine and the surface of the iron shines. Hence, it is a lustrous material.

The wood is not made in factories, but is obtained directly by nature from trees.