- ✓reflection from ionosphere
- Babsorption by ionosphere
- Ctransmission through ionosphere
- Dnone of these
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Eight drops of mercury of equal radii possessing equal charges combine to form a big drop. Then the capacitance of bigger drop compared to each individual small drop is
|
(a) 8 times |
(b) 4 times |
(c) 2 times |
(d) 32 times |
The time of revolution of an electron around a nucleus of charge Ze in nth Bohr orbit is directly proportional to
|
(a) n |
(b) |
(c) |
(d) |
The charge on electron was discovered by
|
(a) J.J. Thomson |
(b) Neil Bohr |
(c) Millikan |
(d) Chadwick |
On heating a liquid, the refractive index generally
|
(a) Decreases |
|
(b) Increases or decreases depending on the rate of heating |
|
(c) Does not change |
|
(d) Increases |
A coil resistance 20W and inductance 5H is connected with a 100V battery. Energy stored in the coil will be
|
(a) 41.5 J |
(b) 62.50 J |
(c) 125 J |
(d) 250 J |