Assertion : The refractive index of a medium decreases with increase in wavelength of incident light.

Reason : The refractive index of a medium decreases with increase in temperature of medium.

1. Both Assertion and Reason are true.
2. Both Assertion and Reason are false.
3. Assertion is false but Reason is true.
4. Assertion is true but Reason is false.

The wave velocity, frequency and wavelength are related as

1. v = fλ

2. λ = vf

3. f = $\dfrac{λ}{v}$

4. v = $\dfrac{λ}{f}$

The production of induced current in one coil due to change in magnetic field is called

1. electromagnetism
2. induction
3. mutual induction
4. steady current

EMF of a cell is dependent on

1. the shape of electrodes
2. the material of electrodes
3. the distance between the electrodes
4. Both (a) and (b)