- A1.6 × 10–19 C
- B3.2 × 10–19 C
- C1.6 × 10–20 C
- D4.8 × 10–19 C
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The mass and energy equivalent to 1 a.m.u. respectively
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(a) 1.67 |
(b) 1.67 |
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(c) 1.67 |
(d) 1.67 |
Which one of the following planet has the longest day
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(a) Venus |
(b) Mars |
(c) Mercury |
(d) Earth |
The ratio of secondary to primary turns is 9 : 4. If power input is P, what will be the ratio of power output (neglect all losses) to power input
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(a) 4 : 9 |
(b) 9 : 4 |
(c) 5 : 4 |
(d) 1 : 1 |
A wheel with ten metallic spokes each 0.50 m long is rotated with a speed of 120 rev/min in a plane normal to the earth’s magnetic field at the place. If the magnitude of the field is 0.4 Gauss, the induced e.m.f. between the axle and the rim of the wheel is equal to
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(a) |
(b) |
(c) 1.256 |
(d) 6.28 |
According to Faraday's law of electromagnetic induction
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(a) The direction of induced current is such that it opposes the cause producing it |
|
(b) The magnitude of induced e.m.f. produced in a coil is directly proportional to the rate of change of magnetic flux |
|
(c) The direction of induced e.m.f. is such that it opposes the cause producing it |
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(d) None of the above |