MCQ
Gold-leaf electroscope can be used _______?
- AOnly to detect the presence of charge.
- BTo detect the presence of charge as well as its nature (positive or negative).
- CTo measure the surface charge density.
- DTo measure current.
Explanation:
If the apparatus is initially in contact with some positively charged body and then comes in contact with another charged body and if the divergence increases we can deduce that the second body is also positively charged. If the divergence decreases then the second body must be negatively charged.
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In the above figure D and E respectively represent
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(a) Absorption line of Balmer series and the ionization potential of hydrogen |
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(b) Absorption line of Balmer series and the wavelength lesser than lowest of the Lyman series |
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(c) Spectral line of Balmer series and the maximum wavelength of Lyman series |
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(d) Spectral line of Lyman series and the absorption of greater wavelength of limiting value of Paschen series |
A star which appears blue will be
|
(a) As hot as the sun |
(b) Cooler than the sun |
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(c) Very cold indeed |
(d) Much hotter than the sun |
In a coil of self inductance 0.5 henry, the current varies at a constant rate from zero to 10 amperes in 2 seconds. The e.m.f. generated in the coil is
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(a) 10 volts |
(b) 5 volts |
(c) 2.5 volts |
(d) 1.25 volts |