The V-i graph for a conductor makes an angle θ with V-axis. Here V denotes the voltage and i denotes current. The resistance of conductor is given by
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(a) sin θ |
(b) cos θ |
(c) tan θ |
(d) cot θ |
(d) cot θ
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When light is refracted from air into glass
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(a) Its wavelength and frequency both increase |
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(b) Its wavelength increases but frequency remains unchanged |
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(c) Its wavelength decreases but frequency remains unchanged |
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(d) Its wavelength and frequency both decrease |
In Young’s double-slit experiment, an interference pattern is obtained on a screen by a light of wavelength 6000 Å, coming from the coherent sources S1 and S2. At certain point P on the screen third dark fringe is formed. Then the path difference S1P – S2P in microns is
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(a) 0.75 |
(b) 1.5 |
(c) 3.0 |
(d) 4.5 |
In the circuit shown below, the cell has an e.m.f. of 10 V and internal resistance of 1 ohm. The other resistances are shown in the figure. The potential difference 
is
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(a) 6 V |
(b) 4 V |
(c) 2 V |
(d) -2V |
If 10% of a radioactive material decays in 5 days, then the amount of original material left after 20 days is approximately
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(a) 60% |
(b) 65% |
(c) 70% |
(d) 75% |
Assertion : If an electron is not deflected while passing through a certain region of space, then only possibility is that there is no magnetic region.
Reason : Force is directly proportional to the magnetic field applied.
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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 assertion is false but reason is true. |