A moving coil sensitive galvanometer gives at once much more deflection. To control its speed of deflection
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(a) A high resistance is to be connected across its terminals |
|
(b) A magnet should be placed near the coil |
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(c) A small copper wire should be connected across its terminals |
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(d) The body of galvanometer should be earthed |
(b) A magnet should be placed near the coil
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Colours of thin films result from
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(a) Dispersion of light |
(b) Interference of light |
(c) Absorption of light |
(d) Scattering of light |
Two stars P and Q are observed at night. Star P appears reddish while, star Q is white. From this we conclude
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(a) Temperature of Q is higher than that of P |
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(b) Temperature of Q is lower than that of P |
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(c) Star Q is at the same distance at that of star P |
|
(d) Star P is farther than star Q |
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 |
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(b) They have the same kinetic energy |
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(c) They have the same de Broglie wavelength |
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(d) They have their speeds varying from zero to a certain maximum |
Three capacitors of 2μF, 3μF and 6μF are joined in series and the combination is charged by means of a 24 volt battery. The potential difference between the plates of the 6 μF capacitor is
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(a) 4 volt |
(b) 6 volt |
(c) 8 volt |
(d) 10 volt |
A spectrum is formed by a prism of dispersive power ‘ω’. If the angle of deviation is ‘δ’, then the angular dispersion is
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(a) ω/δ |
(b) δ / ω |
(c) 1/ ωδ |
(d) ω δ |
The plane surface of a plano-convex lens of focal length f is silvered. It will behave as
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(a) Plane mirror |
(b) Convex mirror of focal length 2 |
|
(c) Concave mirror of focal length f/2 |
(d) None of the above |
