A transformer is employed to
|
(a) Obtain a suitable dc voltage |
(b) Convert dc into ac |
|
(c) Obtain a suitable ac voltage |
(d) Convert ac into dc |
(c) Obtain a suitable ac voltage
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The current carrying wire and the rod AB are in the same plane. The rod moves parallel to the wire with a velocity v. Which one of the following statements is true about induced emf in the rod
|
(a) End A will be at lower potential with respect to B |
|
(b) A and B will be at the same potential |
|
(c) There will be no induced e.m.f. in the rod |
|
(d) Potential at A will be higher than that at B |
A circular disc of which 2/3 part is coated with yellow and 1/3 part is with blue. It is rotated about its central axis with high velocity, then it will be seen as
|
(a) Green |
(b) Brown |
(c) White |
(d) Violet |
The direction of the null points is on the equatorial line of a bar magnet, when the north pole of the magnet is pointing
|
(a) North |
(b) South |
(c) East |
(d) West |
A condenser of capacity 50μF is charged to 10 volts. Its energy is equal to
|
(a) 2.5 |
(b) 2.5 |
(c) 5 |
(d) 1.2 |
In Bohr model of the hydrogen atom, the lowest orbit corresponds to
|
(a) Infinite energy |
(b) The maximum energy |
|
(c) The minimum energy |
(d) Zero energy |
A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of incident beam. At the first maximum of the diffraction pattern the phase difference between the rays coming from the edges of the slit is
|
(a) 0 |
(b) |
(c) |
(d) 2 |
