- A$10\mu\text{F}$
- B$15\mu\text{F}$
- C$20\mu\text{F}$
- D$\text{None of these}$
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What will happen when a 40 watt, 220 volt lamp and 100 watt, 220 volt lamp are connected in series across 40 volt supply
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(a) 100 watt lamp will fuse |
(b) 40 watt lamp will fuse |
|
(c) Both lamps will fuse |
(d) Neither lamp will fuse |
The photo-electrons emitted from a surface of sodium metal are such that
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(a) They all are of the same frequency |
|
(b) They have the same kinetic energy |
|
(c) They have the same de Broglie wavelength |
|
(d) They have their speeds varying from zero to a certain maximum |
The maximum focal length of the eye-lens of a person is greater than its distance from the retina. The eye is:

A particle of mass m and charge q enters a magnetic field B perpendicularly with a velocity v, The radius of the circular path described by it will be
|
(a) Bq/mv |
(b) mq/Bv |
(c) mB/qv |
(d) mv/Bq |
The net resistance of a voltmeter should be large to ensure that
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(a) It does not get overheated |
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(b) It does not draw excessive current |
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(c) It can measure large potential difference |
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(d) It does not appreciably change the potential difference to be measured |
The correct order of ionizing capacity of α, β and γ - rays is
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(a) α > γ > β |
(b) α > β > γ |
(c) α < β <γ |
(d) α > β > γ |