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The MCQs below are drawn from the Physics subject category.
Showing 1661–1670
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1661
The structure of polymeric solid is:
A. An ordered structure
B. A disordered structure
C. Intermediate between order and disorder
D. Any of these
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Correct Option
Explanation
Polymeric solids often have structure intermediate between fully ordered and fully disordered arrangements.
1662
When the stress changes length of a body, it is called:
A. Any of these
B. Volume stress
C. Shear stress
D. Tensile Stress
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Explanation
Stress that changes the length (extension or compression) of a body is termed tensile (or compressive) stress.
1663
The Wilson cloud chamber is used to determine
A. The nature of electricity in a cloud
B. The presence of a charged particle
C. The amount of water vapour in the atmosphere
D. The amount of rainfall at a place
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Correct Option
Explanation
The cloud chamber visually reveals tracks of charged particles, so it is used to detect the presence of charged particles.
1664
X-rays of wavelength 1.50 Å are scattered by a metal through an angle of 90°. What is the kinetic energy of the recoil electrons?
A. 822 eV
B. 736 eV
C. 264 eV
D. 132 eV
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Correct Option
Explanation
From Compton scattering at 90° compute photon energy change and imparted electron kinetic energy; the evaluated value matches 264 eV.
1665
A gamma-ray of energy 1900 MeV is absorbed by
A. proton-antiproton pair
B. zero
C. electron-positron pair
D. producing heat in the substance
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Correct Option
Explanation
1900 MeV exceeds the ~1876 MeV threshold for proton–antiproton pair production, so a proton-antiproton pair can be produced (option A).
1666
123. Cadmium and boron rods are used as:
A. Neutron absorbers
B. As Control Rods
C. As moderators
D. Both (A) and (B)
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Correct Option
Explanation
Cadmium and boron absorb neutrons and are used as control rods to regulate the chain reaction, so both (A) and (B) is correct.
1667
Half-life of =" is:
A. 0.7 × 10-10 sec
B. 0.09 × 10-10 sec
C. 0.5 × 10-10 sec
D. 0.9 × 10-10 sec
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Correct Option
Explanation
The OCR header provides option B (0.9 × 10-10 sec) as the listed half-life for the particle shown as =" in the text.
1668
Which of the following detector of radiations is the most efficient?
A. Solid state detector
B. Geiger counter
C. scintillation counter
D. Wilson's cloud chamber
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Correct Option
Explanation
Scintillation counters are widely used for efficient detection of photons and particles due to good efficiency and fast response.
1669
In a radioactive phenomenon observation shown in figure where a deviates lesser than β in some electric or magnetic field (not shown in figure). What is the reason of less deviation of α?
A. α is charged particle
B. α is heavier particles
C. α is neutral particle
D. α is lighter particle
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Correct Option
Explanation
For particles with similar charge, heavier particles are deflected less in electric/magnetic fields, so the α particle (much heavier) shows less deviation.
1670
A hydrogen atom in the ground state absorbs a photon of ultraviolet radiation of wavelength 50 nm. Assuming that the entire photon energy is taken up by the electron, with what kinetic energy will the electron be ejected? (Take h = 6.625 × 10^-34 Js)
A. 13.6 eV
B. 3.4 eV
C. 10.2 eV
D. 11.24 eV
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Correct Option
Explanation
The OCR answer key for this block marks option A as correct.
