AIIMS UG 2013 Mock Test

A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is:

A coil of self-inductance $L$ is connected in series with a bulb $B$ and an AC source. Brightness of the bulb decreases when:

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is:

Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is:

The half-life of a radioactive isotope 'X' is $20\text{years}$. It decays to stable element 'Y'. The ratio of 'X' to 'Y' in a rock is $1:7$. The age of the rock is: