The scientist who proposed the planetary model of atom was MCQ with Answer and Explanation

The scientist who proposed the planetary model of atom was
A. Ernest Rutherford
B. Niels Bohr
C. Dalton
D. J.J. Thomson
Answer: Option A
Solution (By JKSSB Mock Tests)
Rutherford's gold foil experiment led to planetary model: electrons revolve around tiny positive nucleus. Bohr added quantized orbits. Thomson proposed plum-pudding model. Dalton atomic theory earlier.

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Practice More Physics Questions

Question #1
An electrical appliance is rated 1500 W, 220 V. What is the current drawn by it?
A. 4.5 A
B. 15 A
C. 10 A
D. 6.8 A

Correct Answer: Option D


Explanation:
The power formula is P = VI, where P is power, V is voltage, and I is current. Rearranging for current gives I = P / V. Given P = 1500 W and V = 220 V, the current I = 1500 / 220 ≈ 6.818 Amperes. Thus, 6.8 A is the closest correct answer.

This question belongs to: Science Physics
Question #2
The boiling point of water in Kelvin is
A. 212 K
B. 273 K
C. 373 K
D. 100 K

Correct Answer: Option C


Explanation:
100°C = 373.15 K, approximately 373 K. Freezing 273 K. No degree sign for Kelvin. Kelvin scale starts at absolute zero.

This question belongs to: Science Physics
Question #3
A voltmeter is always connected in
A. Series
B. Either series or parallel
C. Across the ammeter
D. Parallel

Correct Answer: Option D


Explanation:
Voltmeter measures potential difference, must be parallel.

This question belongs to: Science Physics