Physics Past Questions and Answers

Two divers G and H are at depths 20m and 40m, respectively below the water surface in a lake. The pressure on G is O\(_1\) while the pressure on H is P\(_2\), If the atmospheric pressure is equivalent to 10m of water, then the value of P\(_2\)/P\(_1\) is

The figure above represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40\(^o\), then the value of W is

In an experiment in which molten naphthalene is allowed to cool, the cooling curve i n the figure was obtained. The temperature 80\(^o\)C is known as the

In the figure, the value of R is

Which of the following instruments consumes the highest current?

I. Electric iron	250v	1kW
II. Television set	220v	110W
III. Torch light	6v	30W
IV. Immersion heater	110v	500W