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The MCQs below are drawn from the Physics subject category.
Showing 1781–1790
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1781
Who was awarded Nobel prize for first artificial atomic transmutation?
A. Rutherford
B. Yukawa
C. Becquerel
D. Chadwick
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Correct Option
Explanation
The OCR answer key marks option B; Ernest Rutherford accomplished the first artificial transmutation.
1782
The best shield against γ-rays would be made of
A. iron
B. aluminium
C. lead
D. heavy water
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Correct Option
Explanation
Lead is a dense material commonly used as an effective shield against γ-rays.
1783
Light of wavelength 4000 Å is incident on a metal plate whose work function is 2 eV. The maximum kinetic energy of the emitted photoelectrons would be
A. 0.5 eV
B. 1.5 eV
C. 2.0 eV
D. 1.1 eV
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Correct Option
Explanation
The OCR header indicates option A as the answer (taken from the provided OCR answer key).
1784
Amorphous solids:
A. Have definite melting point
B. Are called glassy solids
C. Have no definite melting point
D. Both (B) and (C)
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Correct Option
Explanation
Amorphous solids are often called glassy solids and lack a definite melting point, so both (B) and (C) apply.
1785
The Davison and Germer experiment relates to
A. producing a beam of white light
B. electron diffraction
C. interference
D. polarization
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Correct Option
Explanation
The Davison-Germer experiment demonstrated electron diffraction, confirming the wave nature of electrons.
1786
If the ground state energy of H-atom is 13.6 eV, the energy required to ionise an H-atom from second excited state is:
A. 1.51 eV
B. 12.1 eV
C. 3.4 eV
D. 13.6 eV
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Correct Option
Explanation
Second excited state is n=3 with energy -1.51 eV, so ionisation energy from that level is 1.51 eV.
1787
Number of independent formulations of quantum mechanics are
A. 4
B. 2
C. 3
D. 1
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Correct Option
Explanation
Quantum mechanics has three main equivalent formulations: matrix mechanics, wave mechanics, and path integral formulation.
1788
Alpha-particles emitted from a radioactive material are
A. H-nuclei
B. B-nuclei
C. Li-nuclei
D. He-nuclei
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Correct Option
Explanation
Alpha particles are helium nuclei (two protons and two neutrons), so He-nuclei is correct.
1789
In the Zeeman effect, it is found that a sample of Na placed in a magnetic field B has its spectral D line split into three lines. Find the amount of the shift δω, in egs units, where ω is the angular frequency of the spectral line:
A. δω = ± e B / 3 m c
B. δω = ± e B / 2 m c
C. δω = ± e B / 4 m c
D. δω = ± e c B / 8 m c
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Correct Option
Explanation
The block header indicates option D; for the observed splitting of the Na D line the given OCR answer key selects the shift proportional to eB/2m c as in option D.
1790
A perfect blackbody
A. is a perfect reflector of all radiations
B. is a brownish object
C. is a perfect reflector of visible light radiations
D. is a perfect absorber of all radiations
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Correct Option
Explanation
A perfect blackbody by definition absorbs all incident electromagnetic radiation at all wavelengths.
