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 |
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Which of the following statements is correct
|
(a) The current in a photocell increases with increasing frequency of light |
|
(b) The photocurrent is proportional to applied voltage |
|
(c) The photocurrent increases with increasing intensity of light |
|
(d) The stopping potential increases with increasing intensity of incident light |
When current flows through a conductor, then the order of drift velocity of electrons will be
|
(a) |
(b) |
(c) |
(d) |
How much kinetic energy will be gained by an α - particle in going from a point at 70 V to another point at 50 V
|
(a) 40 eV |
(b) 40 keV |
(c) 40 MeV |
(d) 0 eV |
The condition for observing Fraunhofer diffraction from a single slit is that the light wavefront incident on the slit should be
|
(a) Spherical |
(b) Cylindrical |
(c) Plane |
(d) Elliptical |
If 
in the given figure, then resistance X will be
|
(a) 5Ω |
(b) 10 Ω |
(c) 15 Ω |
(d) 20 Ω |
Fermi level of energy of an intrinsic semiconductor lies
|
(a) In the middle of forbidden gap |
(b) Below the middle of forbidden gap |
|
(c) Above the middle of forbidden gap |
(d) Outside the forbidden gap |
