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The MCQs below are drawn from the Physics subject category.
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2401
124. Due to chain reaction taking place in the core, the temperature of the core rises to about:
A. 573 K
B. 300°C
C. 1200°C
D. Either (A) or (C)
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Correct Option
Explanation
300°C is equivalent to approximately 573 K, so 'Either (A) or (C)' correctly represents the same temperature in two units.
2402
The half-life of the charged π-meson is only:
A. 1.8 × 10^9 sec
B. 1.8 × 10^-6 sec
C. 1.8 × 10^-8 sec
D. 1.8 × 10^-7 sec
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Correct Option
Explanation
The OCR answer key indicates the charged π-meson's half-life as about 1.8 × 10^-8 s, which is option C.
2403
The year and place when and where A. H. Compton did his scattering experiment are:
A. 1923, China
B. 1923, Washington University
C. 1927, Lawrence Barkeley Laboratory
D. 1927, India
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Correct Option
Explanation
Compton conducted his X-ray scattering experiments around 1923 at Washington University.
2404
(130) Charge and mass of a proton are respectively:
A. 1.6 × 10-19 kg
B. 1.673 × 10-27 coul, 1.6 × 10-19 kg
C. Zero, 1.673 × 10-27 kg
D. 1.6 × 10-19 coul, 1.673 × 10-27 kg
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Correct Option
Explanation
A proton has charge +1.6×10^-19 coulombs and mass ≈ 1.673×10^-27 kg, matching option (c).
2405
Which theory is the famous standard model of the universe?
A. Cosmos
B. The big bang
C. The small slap
D. Astronaut
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Correct Option
Explanation
The Big Bang theory is the widely known standard cosmological model for the universe's origin and evolution.
2406
(146) Which of the following is not a correct statement about the exposure in mrems?
A. The natural radioactivity of the body produces about 20 mrems per year.
B. In watching TV for a year, one is exposed to about 20 mrems.
C. Living in Denver Co., one receives about 125 mrems per year.
D. A dental x-ray provides a local exposure of 500 mrems.
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Correct Option
Explanation
A typical dental x-ray dose is far lower than 500 mrem; thus statement (a) is not correct.
2407
The number of electrons in a uranium nucleus is
A. zero
B. 92
C. 143
D. 235
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Correct Option
Explanation
A nucleus contains no electrons, so the number of electrons in a nucleus is zero.
2408
74. If M is atomic mass, A is mass number, then (M - A) is called
A. Packing fraction
B. Fermi energy
C. Mass defect
D. Binding energy
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Correct Option
Explanation
The difference between atomic mass and mass number is the mass defect, so option C is correct.
2409
The number of neutrons in a chain reaction increases in
A. arithmatic progression
B. geometric progression
C. harmonic progression
D. none of the above
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Correct Option
Explanation
In a chain reaction each generation multiplies the neutrons roughly by a factor, so the increase follows a geometric progression.
2410
In an atom for the electron to revolve around the nucleus, the necessary centripetal force is obtained from the following force exerted by the nucleus on the electron
A. Gravitational force
B. Electrostatic force
C. Nuclear force
D. Magnetic force
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Correct Option
Explanation
The Coulomb (electrostatic) attraction between nucleus and electron provides the centripetal force for the electron's orbit; option D is correct.
