A cell of emf 1.5V is connected in series with a 1Ω resistor and a current of 0.3A flows through the resistor. Find the internal resistance of the cell

• A. 4.0Ω
• B. 3.0Ω
• C. 1.5Ω
• D. 1.0Ω

In photo-emission, the number of photo-electrons ejected per second depends on the

• A. frequency of the beam
• B. work function of the metal
• C. threshold frequency of the metal
• D. intensity of the beam

Which of the following obeys ohms laws?

• A. electroytes
• B. metals
• C. diode
• D. glass

Induced emfs are best explained using

• A. Ohm's law
• B. Faraday's law
• C. Colomb's law
• D. Lenz's law

A piece of cork floats in a liquid. What fraction of its volume will be immersed in the liquid? [Density of the cork = 0.25 x 10³kgm^-3, Density of the liquid = 1.25 x 10³kgm^-3]

• A. 0.8
• B. 0.5
• C. 0.2
• D. 0.1

A house has ten 40W and five 100W bulbs. How much will it cost the owner of the house to keep them lit for 10 hours if the cost of a unit is 5N?

• A. N90
• B. N50
• C. N45
• D. N5

The pair of physical quantities that are scalar only are ?

• A. volume and area
• B. moment and momentum
• C. length and displacement
• D. Impulse and time

When a charge moves through an electric circuit in the direction of an electric force, it

• A. gains both potential and kinetic energy
• B. gains potential energy and lose kinetic energy
• C. loses potential energy and gains kinetic energy
• D. loses both potential and kinetic energy

Total internal reflection will not occur when light travels from

• A. water to air
• B. water into glass
• C. glass to air
• D. glass into water

Two liquids X and Y having the same mass are supplied with the same quantity of heat. If the temperature rise in X is twice that of Y, the ratio of specific heat capacity of X to that of Y is

• A. 2:1
• B. 1:2
• C. 4:1
• D. 1:4