Basic Physics Online Test
Rainbow formation is due to:
When sunlight incident on raindrops formation of a Rainbow occurs in the sky. These raindrops work as a prism. When sunlight hits a raindrop, some of the light is reflected. The electromagnetic spectrum is made of light with many different wavelengths, and each is reflected at a different angle. Thus, spectrum is separated, producing a rainbow.
Which of the following is a nonrenewable source of energy?
A nonrenewable resource is a natural substance that is not replenished with the speed at which it is consumed. There are four major types of nonrenewable resources: oil, natural gas, coal, and nuclear energy. Oil, natural gas, and coal are collectively called fossil fuels.
Which combination of colours is the most convenient during day and night time?
White and black combination of colours is the most convenient during day and night time. Black text on a white background is best, since the colour properties and light are best suited for the human eye. That's because white reflects every wavelength in the colour spectrum.
Ice is packed in sawdust because:
Ice is packed in sawdust because it is a poor conductor of heat. The air filled in the fine pores of sawdust is an insulator of heat. This air does not allow heat from outside to pass to the ice thereby preventing its melting.
The energy emitted by the Sun is due to:
Nuclear Fusion reactions power the Sun and other stars. In a fusion reaction, two light nuclei merge to form a single heavier nucleus. The process releases energy because the total mass of the resulting single nucleus is less than the mass of the two original nuclei.
An egg sinks in soft water but floats in a concentrated solution of salt because:
The egg is denser than the soft water, this causes it to sink. Dissolving salt in the water increases the density (adding more molecules per square inch).
A piece of wood is held underwater. The up-thrust on it will be:
When a piece of wood is held underwater, the up-thrust on it will be less than the weight of the wood. Here, the wooden piece is under the water because the up-thrust force acting on the wood under the water is less than the weight of the wooden piece.
The atmospheric air is held to the Earth by:
The atmospheric air is held to the Earth by gravity. Earth's gravity is strong enough to hold onto its atmosphere and keep it from drifting into space.
Which of the following instruments is used to measure relative humidity?
A sling psychrometer can be used to find relative humidity, which is expressed as a percentage.
Clothes keep us warm in winter because they:
Our body supplies the heat, and the clothes help to trap body heat and keeps the heat from escaping into the air. This is what keeps us warm.
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