Select the correct statement
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(a) In a full wave rectifier, two diodes work alternately |
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(b) In a full wave rectifier, two diodes work simultaneously |
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(c) The efficiency of full wave and half wave rectifiers is same |
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(d) The full wave rectifier is bi-directional. |
(a) In a full wave rectifier, two diodes work alternately
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The ratio of longest wavelength and the shortest wavelength observed in the five spectral series of emission spectrum of hydrogen is
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(a) |
(b) |
(c) 25 |
(d) |
The pole pieces of the magnet used in a pivoted coil galvanometer are
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(a) Plane surfaces of a bar magnet |
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(b) Plane surfaces of a horse-shoe magnet |
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(c) Cylindrical surfaces of a bar magnet |
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(d) Cylindrical surfaces of a horse-shoe magnet |
Assertion : For the scattering of a-particles at a large angles, only the nucleus of the atom is responsible.
Reason : Nucleus is very heavy in comparison to electrons.
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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. |
Consider the following two statements:
An electron is travelling horizontally towards east. A magnetic field in vertically downward direction exerts a force on the electron along
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(a) East |
(b) West |
(c) North |
(d) South |
Assuming that the dimmest visible star to the naked eye has a magnitude of about 6. Brightness of planet Venus (magnitude = – 4) w.r.t. this star is
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(a) 10,000 times brighter |
(b) 2000 times brighter |
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(c) 15000 times brighter |
(d) 4000 times brighter |
