MCQ
The electric potential inside a conducting sphere:
- AIncreases from centre to surface.
- BDecreases from centre to surface.
- CRemains constant from centre to surface.
- DIs zero at every point inside.
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The clear sky appears blue because:
The specific resistance of manganin is . The resistance of a cube of length 50 cm will be
|
(a) |
(b) 2.5 |
(c) |
(d) 5 |
Thermal neutrons can cause fission in
|
(a) |
(b) |
(c) |
(d) |
In the above question, the resistance between the square faces is
|
(a) 3 |
(b) 3 |
(c) 3 |
(d) 3 |
Sodium and copper have work functions 2.3eV and 4.5eV respectively. Then the ratio of their threshold wavelengths is nearest to
|
(a) 1: 2 |
(b) 4 : 1 |
(c) 2 : 1 |
(d) 1 : 4 |