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Physics MCQs

1. Nuclear sizes are expressed in a unit named

September 19, 2025 by Admin
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.
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2. Radiocarbon is produced in the atmosphere as a result of

September 19, 2025 by Admin
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.

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3. Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to

September 19, 2025 by Admin
the heating effect of current alone
hysteresis loss alone
both the heating effect of current and hysteresis loss
intense sunlight at noon
✅ The correct answer is option C.

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4. The absorption of ink by blotting paper involves

September 19, 2025 by Admin
viscosity of ink
capillary action phenomenon
diffusion of ink through the blotting
siphon action
✅ The correct answer is option B.

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5. It is easier to roll a stone up a sloping road than to lift it vertical upwards because

September 19, 2025 by Admin
work done in rolling is more than in lifting
work done in lifting the stone is equal to rolling it
work done in both is same but the rate of doing work is less in rolling
work done in rolling a stone is less than in lifting it
✅ The correct answer is option D.

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6. Siphon will fail to work if

September 19, 2025 by Admin
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.

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7. Isotopes of an element contain

September 19, 2025 by Admin
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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8. On a rainy day, small oil films on water show brilliant colours. This is due to

September 19, 2025 by Admin
A. dispersion
B. interference
C. diffraction
D. polarization
✅ The correct answer is option B.

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9. It is more difficult to walk on a sandy road than on a concrete road because

September 19, 2025 by Admin
A. sand is soft and concreter is hard
B. the friction between sand and feet is less than that between concrete and feet
C. the friction between sand and feet is more than that between concrete and feet
D. the sand is grainy but concrete is smooth
✅ The correct answer is option B.

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10. Radiocarbon dating technique is used to estimate the age of

September 19, 2025 by Admin
A. rocks
B. monuments
C. soil
D. fossils
✅ The correct answer is option D.

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