Physics Quiz 3

One of the most common examples of Pascal's Law is the hydraulic braking system present in automobiles. According to this law when pressure is applied on fluid it travels equally in all directions so that uniform braking action is applied on all four wheels.

It was the Danish astronomer, Olaus Roemer, who, in 1676, first successfully measured the speed of light. His method was based on observations of the eclipses of the moons of Jupiter.

Acceleration due to gravity is the acceleration gained by an object due to gravitational force. The value of acceleration due to gravity is least on the equator because the distance between the surface of the earth and its centre is more at the equator than that at the poles.

Clay is a highly plastic substance. Clay particles are attracted to each other by weak electrostatic forces. Water conducts these forces. Thus, dry clay mixed with a fifth of its weight in water, becomes the plastic material clay artists use.

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.

The function of ball bearings in a wheel is to convert kinetic friction into rolling friction because rolling friction is much lesser than sliding friction. Ball bearings reduce friction and facilitate easy movement.

Flat-footed camels can walk easily in sandy deserts because the pressure per unit area on the sand is decreased by increasing the area of the surface in contact.

A transformer works on the principle of mutual induction. The transformer's core works to direct the path of the magnetic field between the primary and secondary coils to prevent the waste of energy. Once the magnetic field reaches the secondary coil, it forces the electrons within it to move, creating an electric current via electromotive force (EMF).

The loss of water in the form of water droplets is called guttation. Guttation is the exudation of drops of xylem sap on the tips or edges of leaves of some vascular plants, such as grasses, and a number of fungi.

The major difference between laser light and other light sources (such as a light bulb) is that laser light is monochromatic, directional and coherent. Monochromatic means that all of the light produced by the laser is of the same frequency, amplitude and phase.