Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

Einstein’s photoelectric equation states that hν = W + E_k. In this equatin, Ek refers to the?

Which of the following is a unit for intensity of light?

The frequency of radio waves corresponding to a wavelength of 10m is:

An electromagnet:

The mass number of He is 4 and that for sulphur is 32. The radius of sulphur nucleus is larger than that of helium, by times

(a)

(b) 4

(c) 2

(d) 8

Which of the following happens when a body is charged positively?

Matter waves are:

The heat produced by a 100 watt heater in 2 minute will be equal to

(a) 12

(b) 10

(c) 6

(d) 3

To produce magnified erect image of a far object, we will be required along with a convex lens, is

(a) Another convex lens

(b)  Concave lens

(c) A plane mirror

(d)  A concave mirror

Two capacitors each of capacity 2 μF  are connected in parallel. This system is connected in series with a third capacitor of 12 μF  capacity. The equivalent capacity of the system will be

(a) 16 μF

(b) 13 μF

(c) 4 μF

(d) 3 μF