Below figures (1) and (2) represent lines of force. Which is correct statement
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(a) Figure (1) represents magnetic lines of force |
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(b) Figure (2) represents magnetic lines of force |
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(c) Figure (1) represents electric lines of force |
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(d) Both figure (1) and figure (2) represent magnetic lines of force |
(a) Figure (1) represents magnetic lines of force
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If a 30 V, 90 W bulb is to be worked on a 120 V line, a resistance of how many ohms should be connected in series with the bulb
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(a) 10 ohm |
(b) 20 ohm |
(c) 30 ohm |
(d) 40 ohm |
In the nth orbit, the energy of an electron 
for hydrogen atom. The energy required to take the electron from first orbit to second orbit will be
|
(a) 10.2 eV |
(b) 12.1 eV |
(c) 13.6 eV |
(d) 3.4 eV |
In short wave communication waves of which of the following frequencies will be reflected back by the ionospheric layer, having electron density 1011 per m3
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(a) 2 MHz |
(b) 10 MHz |
(c) 12 MHz |
(d) 18 MHz |
Four plates of the same area of cross-section are joined as shown in the figure. The distance between each plate is d. The equivalent capacity across A and B will be
|
(a) |
(b) |
(c) |
(d) |
