Physics

Explore physics concepts from mechanics and waves to modern physics. Practice quizzes covering theory, formulas, and real-world applications for students and competitive exam aspirants.

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Electricity & Magnetism

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Mechanics

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Modern Physics

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QUESTION NO 01

Entropy of an isolated system in a spontaneous process?

Answer: Increases or stays the same

Second law: entropy of an isolated system never decreases.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 02

X-rays are produced when?

Answer: Fast electrons strike a metal target

Bremsstrahlung/characteristic X-rays arise from electron–target interactions.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 03

Isotopes have same?

Answer: Atomic number but different mass number

Isotopes: same Z, different N (hence different A).

Shahzad Mahota @shahzad-mahota

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QUESTION NO 04

Gamma rays are?

Answer: High-energy photons

γ radiation is electromagnetic radiation from nuclei.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 05

Gravitational force between two masses is?

Answer: Always attractive

Newton's law of gravitation is always attractive.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 06

Pitch of sound depends mainly on?

Answer: Frequency

Pitch correlates primarily with frequency.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 07

Antinode is a point of?

Answer: Maximum displacement amplitude

Antinodes oscillate with maximum amplitude.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 08

Radioactivity is?

Answer: Spontaneous nuclear decay

Radioactive decay is spontaneous transformation of unstable nuclei.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 09

Beta-minus particle is?

Answer: Electron

β⁻ emission sends out an electron (and antineutrino).

Shahzad Mahota @shahzad-mahota

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QUESTION NO 10

In an isothermal process for an ideal gas,

Answer: Temperature remains constant

Isothermal means constant temperature; for ideal gas ΔU = 0.

Shahzad Mahota @shahzad-mahota

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