An object is placed 30 cm in front of a concave mirror of focal length 20cm. Calculate the distance between the object and the image.

Which of the following instruments can be used to measure e.m.f. most accurately.

A machine has an efficiency of 80%. If the machine is required to overcome a load of 60N with a force of 40N, calculate its velocity ratio.

Which of the following radiations have the longest wavelength?

Calculate the amount of heat generated in an external load of resistance 8Ω if an alternating current of peak value 5 A is passed through it for 100s.

Young’s modulus of elasticity is the ratio of stress to strain, provided the load does not exceed the

How much heat is required to convert 50g of water at 100°C to steam at the same temperature? (Specific latent heat of vaporization of water = 2260 Jg-11)

For which of the following sets are the units fundamental?

Evaporation of a liquid produces cooling of the liquid because the