Physics Questions Answers

Core of a transformer is made up of —

A source of sound has a noise level of 20 dB. If the intensity of sound produced by the source increases by 100 times, the noise level becomes —

Which one of the following metals has the highest density?

Consider the following statements:
Radioisotopes are used —
1. in the diagnosis of certain diseases.
2. for determining the age of rocks
3. in radiation therapy.
4. for computing the age of very old monuments
Which of these statements is/are correct?

Which one of the following elements is used in the manufacture of safety matches?

The main constituent of cosmic rays is —

When white light undergoes dispersion by a prism, the colour that suffers minimum deviation is —

Which one of the following is least soluble in water?

The quality of gasoline sample is determined by its —

Which form of coal is mainly suitable for producing thermal power?