Physics MCQs

1. Nuclear sizes are expressed in a unit named

Fermi
angstrom
newton
tesla
✅ The correct answer is option A.
Fermi – A unit of length equal to 10-15 meter (one femtometer), used in nuclear physics. It is similar to the diameter of a proton.

2. Radiocarbon is produced in the atmosphere as a result of

collision between fast neutrons and nitrogen nuclei present in the atmosphere
action of ultraviolet light from the sun on atmospheric oxygen
action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
lightning discharge in atmosphere
✅ The correct answer is option A.

6. Siphon will fail to work if

the densities of the liquid in the two vessels are equal
the level of the liquid in the two vessels are at the same height
both its limbs are of unequal length
the temperature of the liquids in the two vessels are the same
✅ The correct answer is option B.

7. Isotopes of an element contain

A. the same number of protons but different number of neutrons
B. the same number of neutrons but different number of protons
C. equal number of protons and electrons
D. equal number of nucleons
✅ The correct answer is option A.

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