Radioactivity is a phenomenon associated with MCQ with Answer and Explanation

Question Report Error

Radioactivity is a phenomenon associated with

A. Nuclear instability

B. Molecular vibrations

C. Chemical reactions

D. Electron transitions

Answer: Option A

Solution (By JKExamLibrary)

Unstable nuclei emit radiation to become stable.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

The device used to measure electric potential difference is

A. Ammeter

B. Ohmmeter

C. Voltmeter

D. Galvanometer

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Correct Answer: Option C

Explanation:
Voltmeter measures potential difference in volts. Connected in parallel, high resistance. Galvanometer detects small current, can be converted to ammeter/voltmeter. Ammeter for current. Ohmmeter for resistance.

This question belongs to: Science Physics

Question #2 Report Error

Which of the following is an ohmic conductor?

A. Transistor

B. Electrolyte

C. Diode

D. Copper wire

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Correct Answer: Option D

Explanation:
Copper wire obeys Ohm's law (V ∝ I) at constant temperature. Diode, transistor are non-ohmic (non-linear). Electrolytes can be non-linear. Metals are ohmic.

This question belongs to: Science Physics

Question #3 Report Error

The instrument that measures the density of a liquid is

A. Barometer

B. Hydrometer

C. Hygrometer

D. Lactometer

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Correct Answer: Option B

Explanation:
Hydrometer measures relative density. Lactometer for milk, but general is hydrometer.

This question belongs to: Science Physics

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