NAT I Engineering Physics MCQs With Answers

In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie

The mass defect for the nucleus of helium is 0.0303 a.m.u What is the binding energy per nucleon for helium in MeV?

Huygen's wave theory of light cannot explain

A piece of fuse wire melts when a current of 15 ampere flows through it.With this current, if it dissipates 22.5 W. the resistance of fuse wire will be

In an L-R circuit time constant is that time in which current grows from zero to the value

Steel is preferred for making springs over copper.Whey?

Two forces of 10N and 15N are acting simultaneously on an object in the same direction. Their resultant is

A photoelectric cell converts

When a Na ion and a CI ion are placed in air a force F acts between them when they are separated by a distance of 1 cm from each other the permittivity of air and the dielectric constant of water are ε₀ and K respectively When a piece of salt is placed in water then the force between Na⁺ and CI^- ions separated by a distance of 1 cm will be

What remains constant when the earth revolves around the sun?

Ultra-violet radiation of 6.2 eV falls on an aluminium surface K.E of fastest electrons emitted is(work function = 4.2 eV)