As there is no medium inside the bell jar, sound cannot travel.

It is the friction between the feet and the ground that helps us to walk. Without this friction we would slip and fall.

Here is a case of lowering of melting point of ice with increase of pressure.

A Mirage is a naturally occurring optical phenomenon in which light rays bend to produce a displaced image of distant objects or the sky.

It is caused due to Total internal Reflection.

It is an optical illusion observed in deserts or hot summer days due to which a person sees a pond of water some distance ahead of him in which the surrounding objects appear inverted.

The capacity of a pure capacitor is 1 farad. In D.C circuit, its effective resistance will beInfinite.

The compass should be mounted on the ship in front of the helmsman. The most important thing that you want to keep in mind when mounting the compass is to make sure that it is away from electrical wiring, iron components or anything magnetic.

Resistances of both the bulbs are

R1=V^2/P1 = 220^2/25

R2 = V^2/P2 = 220^2/100

Hence R1gt ; R2

When connected in series, the voltages divide in them in the ratio of their resistances. The voltage of 440 V devides in such a way that voltage across 25 w bulb will be more than 220 V. Hence 25 w bulb will fuse.

The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. The stronger pull exerted by the uncontaminated portion of water brings about a movement of the surface and the camphor particles are carried along with it. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.

Polished surfaces are poor radiators of heat. So loss of heat on that account is reduced and the electric iron remains hotter than otherwise.

A capacitor is a device that stores electrical energy in an electric field.

• It is a passive electronic component with two terminals.
• The effect of a capacitor is known as capacitance.
• Capacitance: The capacitance is the capacity of the capacitor to store charge in it. Two conductors are separated by an insinuator (dielectric) and when an electric field is applied, electrical energy is stored in it as a charge.