For a metallic wire, the ratio V/i (V = the applied potential difference, i = current flowing) is
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(a) Independent of temperature |
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(b) Increases as the temperature rises |
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(c) Decreases as the temperature rises |
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(d) Increases or decreases as temperature rises, depending upon the metal |
(b) Increases as the temperature rises
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If energy of K-shell electron is – 40000 eV and If 60000 V potential is applied at coolidge tube then which of the following X-ray will get form
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(a) Continuous |
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(b) White X-rays |
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(c) Continuous and all series of characteristic |
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(d) None of these |
For a triode m = 64 and gm =1600 m mho. It is used as an amplifier and an input signal of 1V (rms) is applied. The signal power in the load of 40 kW will be
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(a) 23.5 mW |
(b) 48.7 mW |
(c) 25.6 mW |
(d) None of these |
The resistance of a conductor is 5 ohm at 50 oC and 6 ohm at 100 oC. Its resistance at 0 oC is
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(a) 1 ohm |
(b) 2 ohm |
(c) 3 ohm |
(d) 4 ohm |
A cube of a metal is given a positive charge Q. For the above system, which of the following statements is true
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(a) Electric potential at the surface of the cube is zero |
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(b) Electric potential within the cube is zero |
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(c) Electric field is normal to the surface of the cube |
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(d) Electric field varies within the cube |
With the increase in principle quantum number, the energy difference between the two successive energy levels
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(a) Increases |
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(b) Decreases |
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(c) Remains constant |
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(d) Sometimes increases and sometimes decreases |
In the following star circuit diagram (figure), the equivalent resistance between the points A and H will be
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(a) 1.944 r |
(b) 0.973 r |
(c) 0.486 r |
(d) 0.243 r |