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Published on: 23/05/2021
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Download CBSE Class 12th Standard CBSE Physics question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Physics
Questions + Answers key
Take MCQ Physics Test1.
The wavelength of a photon needed to remove a proton from a nucleus which is bound to the nucleus with 1MeV energy is nearly
1.2 nm
1.2 x 10-3 nm
1.2 x 10-6nm
1.2 x 10 nm
2.
Consider a beam of electrons (each electron with energy Eo) incident on a metal surface kept in an evacuated chamber. Then
no electronswillbe emittedas onlyphotons can emit electrons
electronscan be emittedbut all with an energy,E0
electronscan be emittedwith any energy,with a maximumof E 0 - φ (φ is the work function)
electronscan be emittedwith any energy,with a maximumof E0
3.
Two particles A1 and A2 masses m1, m2 (m1>m2) have the same de Broglie wavelength. Then
their momenta are their same
their energies are their same
energy of A1 is less than the energy of A2
energy of A1 is more than the energy of A2
4.
Consider a beam of electrons (each with energy E0) incident on a metal surface kept in an evacuated chamber. Then
no electrons will be emitted as only photons can emit electrons
electrons can be emitted but all with an energy E0
electrons can be emitted with any energy, with a maximum of \({ E }_{ 0 }-\phi \)(\(\phi \)is the work function)
electrons can be emitted with any energy, with a maximum of E0
5.
A particle is dropped from a height H. The de Broglie wavelength of the particle as a function of height is proportional to
\(H\)
\({ H }^{ 1/2 }\)
\({ H }^{ 0 }\)
\({ H }^{ -1/2 }\)
1.
(b)
1.2 x 10-3 nm
2.
(d)
electronscan be emittedwith any energy,with a maximumof E0
3.
(a)
their momenta are their same
4.
(d)
electrons can be emitted with any energy, with a maximum of E0
5.
(d)
\({ H }^{ -1/2 }\)
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