- ASpin dependent and have no non-central part.
- BSpin dependent and have a non-central part.
- CSpin independent and have no non-central part.
- DSpin independent and have a non-central part.
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To an observer on the earth the stars appear to twinkle. This can be ascribed to
|
(a) The fact that stars do not emit light continuously |
|
(b) Frequent absorption of star light by their own atmosphere |
|
(c) Frequent absorption of star light by the earth's atmosphere |
|
(d) The refractive index fluctuations in the earth's atmosphere |
Image formed by a concave mirror of focal length 6 cm, is 3 times of the object, then the distance of object from mirror is
|
(a) – 4 cm |
(b) 8 cm |
(c) 6 cm |
(d) 12 cm |
In a potentiometer circuit there is a cell of e.m.f. 2 volt, a resistance of 5 ohm and a wire of uniform thickness of length 1000 cm and resistance 15 ohm. The potential gradient in the wire is
|
(a) |
(b) |
(c) |
(d) |
What is immaterial for an electric fuse wire
|
(a) Its specific resistance |
(b) Its radius |
|
(c) Its length |
(d) Current flowing through it |
In a radioactive reaction
, the number of α - particles emitted is
|
(a) 7 |
(b) 6 |
(c) 5 |
(d) 4 |