Electromagnetic Waves — Physics STD 12 Science — Question

The X-ray beam coming from an X-ray tube will be

(a) Monochromatic

(b) Having all wavelengths smaller than a certain maximum wavelength

(c) Having all wavelengths larger than a certain minimum wavelength

(d) Having all wavelengths lying between a minimum and a maximum wavelength

When a slow neutron goes sufficiently close to a  nucleus, then the process that takes place is

(a) Fission of

(b) Fusion of neutron

(c) Fusion of

(d) First (a) then(b)

Two identical p-ri junctions may be connected in series with a battery in three ways (figure). The potential difference across the two p-n. junctions are equal in:

Which of the following is not a unit of magnetic induction?

There are three resistance coils of equal resistance. The maximum number of resistances you can obtain by connecting them in any manner you choose, being free to use any number of the coils in any way is

(a) 3

(b) 4

(c) 6

(d) 5

The radius of circular path of an electron when subjected to a perpendicular magnetic field is

(a)

(b)

(c)

(d)

 A variable condenser is permanently connected to a 100 V battery. If the capacity is changed from 2μF to 10 μF, then change in energy is equal to

(a) 2

(b) 2.5

(c) 3.5

(d) 4

Two metallic spheres of radii 1 cm and 2 cm are given charges   and  5 ×   respectively. If they are connected by a conducting wire, the final charge on the smaller sphere is

(a) 3

(b) 1

(c) 4

(d) 2