A landlord has eight 40W electric light bulbs, four 60W bulbs and two 100W bulb in his house. If he has all the points on for five hours daily and if N.E.P....

Two closed vessels contain equal volumes of boiling water and are identical except that one is blackened on the outside while the other is polished. Which of...

The density 400cm3 of palm oil was 0.9gcm-3 before frying. If the density of the oil was 0.6gm-3 after frying,assuming no loss of oil due to spilling, its ne...

A 500kg car which was initially at rest travelled with an acceleration of 5m sec-2, its kinetic energy after 4 seconds was

Which of the following statements defines correctly the efficiency of a machine?

Which of the following types of waves cannot travel through a vacuum?

If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of

In what range of temperature is the expansion of water anomalous?

The temperature at which the water vapour present in the air saturates the air and begins to condense is known as