A study of binary stars is most helpful in
|
(a) Finding their distances |
(b) Finding their temperature |
|
(c) Finding their masses |
(d) Verifying Newton's force law of gravitation |
(d) Verifying Newton's force law of gravitation
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For depositing 1 gm of Cu in copper voltameter on passing 2 amperes of current, the time required will be (For copper Z = 0.00033 gm/C)
|
(a) Approx. 20 minutes |
(b) Approx. 25 minutes |
(c) Approx. 30 minutes |
(d) Approx. 35 minutes |
In the circuit given, the correct relation to a balanced Wheatstone bridge is
|
(a) |
(b) |
(c) |
(d) None of these |
What is the de-Broglie wavelength of the α - particle accelerated through a potential difference V
|
(a) |
(b) |
(c) |
(d) |
Fission of nuclei is possible because the binding energy per nucleon in them
|
(a) Increases with mass number at high mass numbers |
|
(b) Decreases with mass number at high mass numbers |
| (c) Increases with mass number at low mass numbers |
| (d) Decreases with mass number at low mass numbers |
Two equal charges q are placed at a distance of 2a and a third charge -2q is placed at the midpoint. The potential energy of the system is
|
(a) |
(b) |
(c) |
(d) |
The photoelectric threshold wavelength for a metal surface is 6600 Å. The work function for this is
|
(a) 1.87 V |
(b) 1.87 eV |
(c) 18.7 eV |
(d) 0.18 eV |
