- A49:4
- ✓4:49
- C3:7
- DNone of these
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The relation between n1 and n2, if behaviour of light rays is as shown in figure is
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(a) |
(b) |
(c) |
(d) |
A star moves away from earth at speed 0.8 c while emitting light of frequency 6 . What frequency will be observed on the earth (in units of 1014 Hz) (c = speed of light)
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(a) 0.24 |
(b) 1.2 |
(c) 30 |
(d) 3.3 |
For what value of R the net resistance of the circuit will be 18 ohms
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(a) 8 Ω |
(b) 10 Ω |
(c) 16 Ω |
(d) 24 Ω |
An achromatic combination of lenses produces
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(a) Coloured images |
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(b) Highly enlarged image |
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(c) Images in black and white |
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(d) Images unaffected by variation of refractive index with wavelength |
In Young's double slit experiment, if one of the slit is closed fully, then in the interference pattern
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(a) A bright slit will be observed, no interference pattern will exist |
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(b) The bright fringes will become more bright |
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(c) The bright fringes will become fainter |
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(d) None of the above |
Assertion : Electric conduction in gases is possible at normal pressure.
Reason : The electric conduction in gases depends only upon the potential difference between the electrodes.
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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. |
Assertion : There is no atmosphere on moon
Reason : Escape velocity at the surface of moon is low.
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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. |
Infinite charges of magnitude q each are lying at x =1, 2, 4, 8... meter on X-axis. The value of intensity of electric field at point x = 0 due to these charges will be
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(a) 12 ×109q N/C |
(b) Zero |
(c) 6 × 109q N/C |
(d) 4 × 109q N/C |