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When the current change from + 2A to – 2A in 0.05 second, an e.m.f. of 8 V is induced in a coil. The coefficient of self-induction of the coil is
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(a) 0.1 H |
(b) 0.2 H |
(c) 0.4 H |
(d) 0.8 H |
A galvanometer with a resistance of 12 W gives full scale deflection when a current of 3 mA is passed. It is required to convert it into a voltmeter which can read up to 18 V. the resistance to be connected is
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(a) 6000 W |
(b) 5988 W |
(c) 5000 W |
(d) 4988 W |
Assertion : The comet do not obey Kepler's laws of planetary motion
Reason : The comet do not have elliptical orbit
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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. |
Monochromatic light of frequency 5 
Hz travelling in vacuum enters a medium of refractive index 1.5. Its wavelength in the medium is
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(a) 4000 Å |
(b) 5000 Å |
(c) 6000 Å |
(d) 5500 Å |
If 
are the lengths of the emitter, base and collector of a transistor then
|
(a) |
(b) |
(c) |
(d) |
In Young’s double slit experiment, the intensity of light coming from the first slit is double the intensity from the second slit. The ratio of the maximum intensity to the minimum intensity on the interference fringe pattern observed is
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(a) 34 |
(b) 40 |
(c) 25 |
(d) 38 |
In Young's double slit experiment the y-coordinates of central maxima and 10th maxima are 2 cm and 5 cm respectively. When the YDSE apparatus is immersed in a liquid of refractive index 1.5 the corresponding y-coordinates will be
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(a) 2 cm, 7.5 cm |
(b) 3 cm, 6 cm |
(c) 2 cm, 4 cm |
(d) 4/3 cm, 10/3 cm |
Comparing real and virtual images, we may say that:
On increasing the temperature of a conductor, its resistance increases because
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(a) Relaxation time decreases |
(b) Mass of the electrons increases |
|
(c) Electron density decreases |
(d) None of the above |
The ratio of specific charge of an α -particle to that of a proton is
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(a) 2 : 1 |
(b) 1 : 1 |
(c) 1 : 2 |
(d) 1 : 3 |
