The n rows each containing m cells in series are joined in parallel. Maximum current is taken from this combination across an external resistance of 3W resistance. If the total number of cells used are 24 and internal resistance of each cell is 0.5 W then
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(a) m = 8, n = 3 |
(b) m = 6, n = 4 |
(c) m= 12, n = 2 |
(d) m = 2, n = 12 |
(c) m= 12, n = 2
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In a diode valve the cathode temperature must be (f = work function)
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(a) High and ∅ should be high |
(b) High and ∅ should be low |
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(c) Low and ∅ should be high |
(d) Low and ∅ should be high |
The maximum current that can be measured by a galvanometer of resistance 40 W is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected in series with the galvanometer is ... (in ohm)
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(a) 5040 |
(b) 4960 |
(c) 2010 |
(d) 4050 |
To make a PN junction conducting
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(a) The value of forward bias should be more than the barrier potential |
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(b) The value of forward bias should be less than the barrier potential |
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(c) The value of reverse bias should be more than the barrier potential |
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(d) The value of reverse bias should be less than the barrier potential |
When X rays pass through a strong uniform magnetic field, Then they
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(a) Do not get deflected at all |
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(b) Get deflected in the direction of the field |
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(c) Get deflected in the direction opposite to the field |
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(d) Get deflected in the direction perpendicular to the field |