Physics Quiz 6

The function of ball bearings in a wheel is to convert kinetic friction (sliding friction) into rolling friction.

An integrated circuit (IC) is a set of electronic circuits on one small flat piece of semiconductor material, usually silicon. IC can function as an amplifier, oscillator, timer, microprocessor, or even computer memory.

A battery is a DC voltage source that converts chemical energy to electrical energy. The chemical reactions in a battery involve the flow of electrons from one material (electrode) to another, through an external circuit.

Complementary colours are pairs of colours which, when combined or mixed, cancel each other out by producing white or black. Examples of complementary colour combinations are: Red and green; yellow and blue (purple).

Sonar is a device that uses sound waves to detect and range objects on or under the surface of the water.

Asteroids are rocky objects revolving around the sun that are too small to be called planets. The asteroid belt is a torus-shaped region in the Solar System, located roughly between the orbits of the planets Mars and Jupiter.

Speed of light in air is 3×10⁸ m/s and speed of light in common glass is 2×10⁸ m/s.

Sound cannot pass through vacuum. This is because sound waves are mechanical waves that need a medium (such as air, steel and water) to travel.

The atmosphere is heated mainly by the Radiation from the Sun. This radiation when passes through the atmosphere is absorbed by soil, plants, water bodies, the air molecules.

Ammeter is an instrument for measuring either direct or alternating electric current, in amperes.