Question
Zener diode is used as
|
(a) Half wave rectifier |
(b) Full wave rectifier |
|
(c) ac voltage stabilizer |
(d) dc voltage stabilizer |
Zener diode is used as
|
(a) Half wave rectifier |
(b) Full wave rectifier |
|
(c) ac voltage stabilizer |
(d) dc voltage stabilizer |
(c) ac voltage stabilizer
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
For comparing the e.m.f.'s of two cells with a potentiometer, a standard cell is used to develop a potential gradient along the wires. Which of the following possibilities would make the experiment unsuccessful
|
(a) The e.m.f. of the standard cell is larger than the E e.m.f.'s of the two cells |
|
(b) The diameter of the wires is the same and uniform throughout |
|
(c) The number of wires is ten |
|
(d) The e.m.f. of the standard cell is smaller than the e.m.f.'s of the two cells |
By properly combining two prisms made of different materials, it is possible to:
A conducting wire is dropped along east-west direction, then
|
(a) No emf is induced |
|
(b) No induced current flows |
|
(c) Induced current flows from west to east |
|
(d) Induced current flows from east to west |
A rod of length 20 cm is rotating with angular speed of 100 rps in a magnetic field of strength 0.5 T about it’s one end. What is the potential difference between two ends of the rod
|
(a) 2.28 V |
(b) 4.28 V |
(c) 6.28 V |
(d) 2.5 V |
A non-conducting solid sphere of radius R is uniformly charged. The magnitude of the electric field due to the sphere at a distance r from its centre
|
(a) Increases as r increases for r < R |
(b) Decreases as r increases for 0 < r < ∞ |
|
(c) Decreases as r increases for R < r < ∞ |
(d) a, c |
Temperature above which a ferromagnetic substance becomes paramagnetic is called
| (a) Critical temperature | (b) Boyle's temperature |
| (c) Debye's temperature | (d) Curie temperature |