Physics Quiz 5

Due to the presence of pores (narrow space) in the wick, capillary action takes place, which makes the oil rise in the wick. Capillary action is the process of a liquid flowing in a narrow space without the assistance of, or even in opposition to, any external forces like gravity.

The period of oscillation of a simple pendulum is T=2π√(l/g). The value of g is less on the moon than that on the surface of the earth. So T increases. Hence, the time period of a pendulum when taken to the Moon would increase.

If the force is held constant the pressure is inversely proportional to the area (Pressure = force/area). Here area of the nail is much greater than the area of the needle. Thus, needle exerts more pressure than nail on the balloon.

When the ice was floating, the volume of water displaced had a mass equal to that of ice. After melting, that mass of ice has been converted into water. Therefore, there is no change in water level.

Heat transfer horizontally within the atmosphere is called advection. Advection is the transfer of heat or matter by the flow of a fluid, especially horizontally in the atmosphere or the sea. The horizontal movement of the air is comparatively more significant than the vertical movement.

Diamonds are glittering and attractive because light incident on them undergoes multiple internal reflections. Most of the light rays approaching the surface of a diamond are incident with an angle of incidence more than critical angle. Hence, they suffer multiple reflections and ultimately come out of diamond from the top. This gives the diamond a sparking brilliance.

The sky appears blue to the human eye as the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.

Apollo 11 was the first manned mission to land on the Moon. The first steps by humans on another planetary body were taken by Neil Armstrong and Buzz Aldrin on July 20, 1969.

Superconductors are those elements whose resistance falls almost to zero at very low temperatures. Superconductivity is complete disappearance of electrical resistance in various solids when they are cooled below a characteristic temperature.

Frequency determines colour, but wavelength is the easier thing to measure. These wavelengths range from 700 nm at the red end of the spectrum to 400 nm at the violet end. Visible light waves are the only electromagnetic waves we can see.