Physics Quiz 5

Steel is more elastic than rubber because it required a larger deforming force. If the same amount of force is applied to steel and to rubber, the extension of rubber is easier than the extension of steel. Hence, the strain in steel is much smaller than the rubber.

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).

The kilowatt-hour (kWh) is a unit of energy equal to one kilowatt of power sustained for one hour and is commonly used as a measure of electrical energy. One kilowatt-hour is equal to 3600 kilojoules.

Solar energy is created by nuclear fusion that takes place in the sun. Fusion occurs when protons of hydrogen atoms violently collide in the sun's core and fuse to create a helium atom. This process, known as a PP (proton-proton) chain reaction, emits an enormous amount of energy.

A sling psychrometer can be used to find relative humidity, which is expressed as a percentage.

A concave lens is used to correct short-sightedness (myopia). A short-sighted person's focus is focusing before the back of the eyeball. The concave lens pushes the rays of light further apart so that they arrive together in proper focus at the back of the eye.

A spherical ball made of steel when dropped in a mercury container will be on the surface of mercury because the density of mercury is higher than that of steel.

Ventilation is mainly used to control indoor air quality, temperature, humidity, and air motion. It is provided near the ceiling of the room because the exhaled warmer air rises up and goes out.

As altitude increases and atmospheric pressure decreases, the boiling point of water decreases. To compensate for the lower boiling point of water, the cooking time must be increased. Turning up the heat will not help cook food faster.

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.