- ✓12th part of the mass of carbon atom
- B12th part of the mass of oxygen atom
- COne 16th of the mass of the hydrogen atom
- DOne 16th of the mass of a helium atom
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A rectangular coil of 300 turns has an average area of average area of 25 cm × 10 cm. The coil rotates with a speed of 50 cps in a uniform magnetic field of strength 4
about an axis perpendicular of the field. The peak value of the induced e.m.f. is (in volt)
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(a) 3000 π |
(b) 300 π |
(c) 30 π |
(d) 3 π |
Intrinsic semiconductor is electrically neutral. Extrinsic semiconductor having large number of current carriers would be
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(a) Positively charged |
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(b) Negatively charged |
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(c) Positively charged or negatively charged depending upon the type of impurity that has been added |
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(d) Electrically neutral |
Assertion : A star which appears blue will be much hotter than the sun
Reason : It is based on Wien's law
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
The frequencies of X-rays, g-rays and ultraviolet rays are respectively a, b and c. Then
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(a) a < b, b > c |
(b) a > b, b > c |
(c) a > b, b < c |
(d) a < b, b < c |

In the Wheatstone's bridge shown, P = 2 Ω, Q = 3Ω, R = 6Ω and S = 8Ω. In order to obtain balance, shunt resistance across 'S' must be
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(a) 2 Ω |
(b) 3 Ω |
(c) 6 Ω |
(d) 8 Ω |