When a wire loop is rotated in a magnetic field, the direction of induced e.m.f. changes once in each
|
(a) |
(b) |
(c) 1 revolution |
(d) 2 revolution |
(b) 
revolution
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
If 20 gm of a radioactive substance due to radioactive decay reduces to 10 gm in 4 minutes, then in what time 80 gm of the same substance will reduce to 10 gm
|
(a) In 8 minutes |
(b) In 12 minutes |
(c) In 16 minutes |
(d) In 20 minutes |
If the shift of wavelength of light emitted by a star is towards violet, then this shows that star is
|
(a) Stationary |
(b) Moving towards earth |
|
(c) Moving away from earth |
(d) Information is incomplete |
Two resistors are connected (a) in series (b) in parallel. The equivalent resistance in the two cases are 9 ohm and 2 ohm respectively. Then the resistances of the component resistors are
|
(a) 2 ohm and 7 ohm |
(b) 3 ohm and 6 ohm |
(c) 3 ohm and 9 ohm |
(d) 5 ohm and 4 ohm |
A nucleus 
emits one α and one β particles. The resulting nucleus is
|
(a) |
(b) |
(c) |
(d) |
