Radioactivity was discovered by MCQ with Answer and Explanation

Question Report Error

Radioactivity was discovered by

A. Becquerel

B. Rutherford

C. Curie

D. Roentgen

Answer: Option A

Solution (By JKExamLibrary)

Henri Becquerel discovered natural radioactivity in uranium salts (1896). Curie isolated radium, Rutherford classified rays.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

The core of a transformer is laminated to reduce

A. Eddy current loss

B. Flux leakage

C. Copper loss

D. Hysteresis loss

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Correct Answer: Option A

Explanation:
Lamination of core increases resistance to circulating eddy currents, reducing eddy current losses (I²R). Hysteresis loss reduced by using soft iron. Copper loss is in windings. Lamination is insulation between layers.

This question belongs to: Science Physics

Question #2 Report Error

Which of the following is NOT a unit of pressure?

A. Watt

B. Pascal

C. Torr

D. Bar

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Correct Answer: Option A

Explanation:
Watt is power. Others are pressure units.

This question belongs to: Science Physics

Question #3 Report Error

A transformer steps up 220 V to 2200 V. The turn ratio (secondary to primary) is

A. 220:1

B. 1:10

C. 10:1

D. 1:1

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Correct Answer: Option C

Explanation:
For ideal transformer, V_s/V_p = N_s/N_p. So N_s/N_p = 2200/220 = 10. So secondary turns 10 times primary. Ratio 10:1. Step-up increases voltage.

This question belongs to: Science Physics

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