The graph between wave number () and angular frequency (w) is
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(a) |
(b) |
(c) |
(d) |
The graph between wave number () and angular frequency (w) is
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(a) |
(b) |
(c) |
(d) |
(a)
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Assertion : A potentiometer of longer length is used for accurate measurement.
Reason : The potential gradient for a potentiometer of longer length with a given source of e.m.f. becomes small.
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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 wavelength Ka X-rays produced by an X-ray tube is 0.76 Å. The atomic number of anticathode material is
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(a) 82 |
(b) 41 |
(c) 20 |
(d) 10 |
Assertion : The tangent galvanometer can be made more sensitive by increasing the number of turns of its coil.
Reason : Current through galvanometer is proportional to the number of turns of coil.
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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 temperature coefficient of resistance for a wire is 0.00125/℃. At 300K its resistance is 1 ohm. The temperature at which the resistance becomes 2 ohm is
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(a) 1154 K |
(b) 1100 K |
(c) 1400 K |
(d) 1127 K |
The current through choke coil increases form zero to 6A in 0.3 seconds and an induced e.m.f. of 30 V is produced. The inductance of the coil of choke is
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(a) 5 H |
(b) 2.5 H |
(c) 1.5 H |
(d) 2 H |
Tangent galvanometer is used to measure
| (a) Steady currents | (b) Current impulses |
| (c) Magnetic moments of bar magnets | (d) Earth's magnetic field |