Current Electricity — Physics STD 12 Science — Question

The curve of binding energy per nucleon as a function of atomic mass number has a sharp peak for helium nucleus. This implies that helium(a) Can easily be broken up(b) Is very stable (c) Can be used as fissionable material(d) Is radioactive

If in a photoelectric experiment, the wavelength of incident radiation is reduced from 6000 Å to 4000 Å then(a) Stopping potential will decrease(b) Stopping potential will increase(c) Kinetic energy of emitted electrons will decrease(d) The value of work function will decrease

Two resistances R and 2R are connected in parallel in an electric circuit. The thermal energy developed in R and 2R are in the ratio:

1. 1 : 2
2. 2 : 1
3. 1 : 4
4. 4 : 1

Select the correct statements. Coulomb’s law correctly describes the electric force that:
i. binds the electrons of an atom to its nucleus.
ii. binds the protons and neutrons in the nucleus of an atom.
iii. binds atoms together to form molecules.

A man who cannot see clearly beyond 5 m wants to see stars clearly. He should use a lens of focal length(a) – 100 m(b)  + 5 m(c) – 5 m (d) Very large 

The value of mutual inductance can be increased by.

A magnet is moved into the coil of wire as shown, there is a small reading on the sensitive meter.
Which change would increase the size of the reading?

In Young's double slit experiment using sodium light (λ = 5898 Å), 92 fringes are seen. If given colour (λ = 5461 Å) is used, how many fringes will be seen(a) 62(b) 67(c) 85       (d) 99