α-particles, deuterons and protons of same energy are moving in a perpendicular magnetic field. The ratio of diameters of their circular paths will be
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(a) (1:√2:1) (b) (√2:1:1) (c) (2:1:1) (d) (1:1:2)
When photons of energy hν are incident on the surface of photosensitive material of work function hν₀, then
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(a) The kinetic energy of all emitted electrons is hν₀ (b) The kinetic energy […]
The photoelectric threshold frequency of a metal is ν. When light of frequency 4ν is incident on the metal, the maximum kinetic energy of the emitted photoelectron is
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(a) 4hν (b) 3hν […]
An inductor is connected to an a.c. source when compared to voltage, the current in the lead wires
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(a) is ahead in phase by π (b) lags in phase by π (c) […]
A galvanometer has a resistance 50Ω. A resistance of 5Ω is connected parallel to it. Fraction of the total current flowing through galvanometer is
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(a) (1/10) (b) (1/11) (c) (1/50) (d) (2/15)
A charged particle enters a uniform magnetic field with a certain speed at right angles to it. In the magnetic field a change could occur in its
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(a) kinetic energy (b) angular […]
If longitudinal strain for a wire is 0.03 and its poisson’s ratio is 0.5, then its lateral strain is
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(a) 0.003 (b) 0.0075 (c) 0.015 (d) 0.4
Correct Answer:
0.015
Explanation:
No […]
Electrons in the atom are held to the nucleus by
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(a) Coulomb’s forces (b) nuclear forces (c) van der waal’s forces (d) gravitational forces
Correct Answer:
Coulomb’s forces
Explanation:
No explanation available. […]
Mass of the nucleons together in a heavy nucleus is
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(a) greater than mass of nucleus (b) equal to mass of nucleus (c) less than mass of nucleus (d) any of these
Ratio of the radii of the nuclei with mass numbers 8 and 27 would be
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(a) 27 / 8 (b) 8 / 27 (c) 2 / 3 (d) 3 / 2
Correct […]
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