12. Physics 1999]
When a small lamp is held 1.5 m above the surface of
water in a tank, its image formed by reflection at the
surface appears to coincide with the image of the bot-
tom of the tank. (u of water = 4/3). The depth of the
tank is
(a) 2 m
(b) 1.5 m
(c) 1 m
(d) 4 m.

when the use of electricity burdens the fuse and miniarure circuit beakers and there is a possibility of a fuse then they automatically cut off the electricity supply to your homes and after you fix the problem u jzt switch it on and it continues the supply of electricity to ur homes

it would be kevlar ^^

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.