Physics Past Questions and Answers

I It retains its magnetic much longer than steel.
II It is more easily magnetized than steel
III It is more easily demagnetized than steel
IV It produces a stronger magnet than steel
Which combination of the above makes iron preferable to steel in the making of electromagnets?

Which of the following pairs of light rays show the widest separation in the spectrum of white light

The most suitable cell used for short interval switches in electric bells is a

A ray incident on a glass prism undergoes minimum deviation when the

The count rate of a radioactive material is 800 count/min. If the half-life of the material is 4 days, what would the count rate be in 16 days later