Physics Quiz 5

All nuclear power plants use nuclear fission, and most nuclear power plants use uranium atoms. During nuclear fission, a neutron collides with a uranium atom and splits it, releasing a large amount of energy in the form of heat and radiation.

Due to inertia of motion, as long as the ball stays in the air, both the boy and the ball move in the same direction which cause the ball falls into his hand.

Due to low air pressure, it is difficult to breathe at higher altitudes. The air at higher altitudes is colder, less dense, and contains fewer oxygen molecules.

A full-wave rectifier rectifies both the half cycles of the AC input i.e., it conducts twice during a cycle. Hence, output frequency would be double to that of input frequency. Thus, the output frequency of a full-wave rectifier would be 2n.

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.

A metal plate with a circular hole at the centre is heated, then the hole will expand in the same ratio as the metal. This is because the metal plate does not expand radially from the hole, it expands along the circumference i.e. the circumference of the ring expands in the same ratio as the width of the plate.

Milk is put in a container in a centrifuge machine and the container is spun at a very high speed. The centrifugal forces act on milk and separate the milk into a cream that is lighter thus floats on top and skimmed milk which is at the bottom. Then cream can be separated from the milk.

The angle of friction and angle of repose are equal to each other. The angle which the resultant of force of limiting friction F and normal reaction R makes with direction of normal reaction R is called angle of friction. Angle of repose is the steepest angle at which a sloping surface formed of loose material is stable.

Lambert's law is related to illumination. The law states that Illuminance at a point on a plane is proportional to the cosine of the angle of light incident (the angle between the direction of the incident light and the normal to the plane).

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.