In a discharge tube ionization of enclosed gas is produced due to collisions between
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(a) Netural gas atoms/molecules (b) Positive ions and neutral atoms/molecules (c) Negative electrons and neutral atoms/molecules (d) Photons […]
Two cells, having the same e.m.f. are connected in series through an external resistance R. Cells have internal resistances r₁ and r₂ (r₁ > r₂) respectively. When the circuit is closed, the potential difference across […]
The radius of germanium nuclide is measured to be twice the radius of ₄⁹Be. The number of nucleons in Ge are
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(a) 72 (b) 73 (c) 74 (d) 75
Correct Answer:
72
Explanation: […]
The binding energy of deutron is 2.2 MeV and that of ₂⁴He is 28 MeV. If two deutrons are fused to form one ₂⁴He then the energy released is
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(a) 30.2 MeV (b) […]
The molar specific heat at constant pressure of an ideal gas is (7/2)R. The ratio of specific heat at constant pressure to that at constant volume is
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(a) (9/7) (b) (7/5) (c) […]
A photocell employs photoelectric effect to convert
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(a) Change in the frequency of light into a change in the electric current (b) Change in the frequency of light into a change in […]
A body of mass 3 kg is under a constant force which cause a displacement s in metres in it, given by the relation s=1/3 t², where t is in seconds. Work done by the […]
When photons of energy hν fall on an aluminium plate (of work function E₀), photoelectrons of maximum kinetic energy K are ejected. If the frequency of radiation is doubled, the maximum kinetic energy of the […]
The moment of inertia of a uniform circular disc of radius R and mass M about an axis touching the disc at its diameter and normal to the disc
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(a) 1/2 MR² […]
A 0.5 kg ball moving with a speed of 12 m/s strikes a hard wall at an angle of 30° with the wall. It is reflected with the same speed at the same angle. If […]
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