Current Electricity — Physics STD 12 Science — Question

Magnetic moment of a thin bar magnet is M. If it is cut first perpendicular to length and then perpendicular to breadth, then magnetic moment of obtained piece is:

In Young’s experiment, the distance between slits is 0.28 mm and distance between slits and screen is 1.4 m. Distance between central bright fringe and third bright fringe is 0.9 cm. What is the wavelength of used light (a) 5000 Å(b) 6000 Å(c) 7000 Å(d) 9000 Å

For nuclei with A > 100:

1. The binding energy of the nucleus decreases on an average as A increases.
2. The binding energy per nucleon decreases on an average as A increases.
3. If the nucleus breaks into two roughly equal parts, energy is released.
4. If two nuclei fuse to form a bigger nucleus, energy is released.

A capacitor becomes a perfect insulator for:

A glass lens is placed in a medium in which it is found to behave like a glass plate. Refractive index of the medium will be(a) Greater than the refractive index of glass(b) Smaller than the refractive index of glass(c) Equal to refractive index of glass(d) No case will be possible from above 

In Boolean algebra A.B=Y implies the:

A narrow beam of white light goes through a slab having parallel faces.

1. The light never splits in different colours.
2. The emergent beam is white.
3. The light inside the slab is split into different colours.
4. The light inside the slab is white.