- Adoubled
- Bhalf
- ✓four times
- Dsame
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A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is
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(a) Charge Q |
(b) Potential V |
(c) Capacity C |
(d) Energy U |
Resistance of semiconductor at 0 K is
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(a) Zero |
(b) Infinite |
(c) Large |
(d) Small |
The resistivity of a wire
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(a) Increases with the length of the wire |
|
(b) Decreases with the area of cross-section |
|
(c) Decreases with the length and increases with the cross-section of wire |
|
(d) None of the above statement is correct |
A frictionless dielectric plate S is kept on a frictionless table T. A charged parallel plate capacitance C (of which the plates are frictionless) is kept near it. The plate S is between the plates. When the plate S is left between the plates

|
(a) It will remain stationary on the table |
|
(b) It is pulled by the capacitor and will pass on the other end |
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(c) It is pulled between the plates and will remain there |
|
(d) All the above statements are false |
Emission spectrum of
gas
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(a) Is a line spectrum |
(b) Is a band spectrum |
|
(c) Is a continuous spectrum |
(d) Does not fall in the visible region |
To an observer on the earth the stars appear to twinkle. This can be ascribed to
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(a) The fact that stars do not emit light continuously |
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(b) Frequent absorption of star light by their own atmosphere |
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(c) Frequent absorption of star light by the earth's atmosphere |
|
(d) The refractive index fluctuations in the earth's atmosphere |