The refractive indices of kerosene oil, water and turpentine oil are 1.44, 1.33 and 1.87, respectively. In which of these material light travel faster?

1. kerosene oil
2. Turpentine oil
3. Water
4. Same in all

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.

Which one of the following is a reliable measure?

1. Hotness
2. Coldness
3. Temperature
4. None of these

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