Two different loops are concentric and lie in the same plane. The current in the outer loop is clockwise and increasing with time. The induced current in the inner loop then, is
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(a) Clockwise |
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(b) Zero |
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(c) Counter clockwise |
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(d) In a direction that depends on the ratio of the loop radii |
(c) Counter clockwise
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If the speed of light were 2/3 of its present value, the energy released in a given atomic explosion will be decreased by a fraction
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(a) 2/3 |
(b) 4/9 |
(c) 3/4 |
(d) 5/9 |
Which of the energy band diagrams shown in the figure corresponds to that of a semiconductor
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(a)
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(b)
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(c)
|
(d)
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A sky wave with a frequency 55 MHz is incident on D-region of earth's atmosphere at 45o. The angle of refraction is (electron density for D-region is 400 electron/cm3)
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(a) 60° |
(b) 45° |
(c) 30° |
(d) 15° |
$\text{v}_1=\text{v}_2$
$\text{v}_1=13.6\text{v}_2$
$\text{v}_1=\frac{\text{v}_2}{\text{13.6}\cdot}$
$\text{v}_1=\sqrt{13.6}\text{v}_2$
A current of 16 ampere flows through molten NaCl for 10 minute. The amount of metallic sodium that appears at the negative electrode would be
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(a) 0.23 gm |
(b) 1.15 gm |
(c) 2.3 gm |
(d) 11.5 gm |
The following four wires are made of the same material and are at the same temperature. Which one of them has highest electrical resistance
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(a) Length = 50 cm, diameter = 0.5 mm |
(b) Length = 100 cm, diameter = 1 mm |
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(c) Length = 200 cm, diameter = 2 mm |
(d) Length = 300 cm, diameter = 3 mm |
A positively charged ball hangs from a silk thread. We put a positive test charge 
at a point and measure F/, then it can be predicted that the electric field strength E
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(a) |
(b) |
(c) |
(d) Cannot be estimated |
