Which of the following is an example of a second order lever? MCQ with Answer and Explanation

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Which of the following is an example of a second order lever?

A. Fishing rod

B. Nutcracker

C. Scissors

D. Tweezers

Answer: Option B

Solution (By JKExamLibrary)

Load between fulcrum and effort: nutcracker, wheelbarrow. Scissors first order, fishing rod third.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

Sunlight travel time to Earth:

A. 8 hours

B. 8 seconds

C. 8 minutes

D. 8 days

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Correct Answer: Option C

Explanation:
Distance ≈ 1.5×10¹¹ m, c = 3×10⁸ m/s ⇒ t = 500 s ≈ 8.3 min. Standard astronomical fact. Memory aid: 'Sunlight takes 8 minutes; we see Sun as it was 8 min ago'. Scale knowledge frequently tested in competitive exams.

This question belongs to: Science Physics

Question #2 Report Error

A car moving at constant velocity of 10 m/s has net force acting on it equal to

A. Force of engine

B. Zero

C. Weight of car

D. Frictional force

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Correct Answer: Option B

Explanation:
Constant velocity implies zero acceleration, net force = 0 by Newton's first law. Engine force balances friction and air resistance. Net force zero, not necessarily zero forces.

This question belongs to: Science Physics

Question #3 Report Error

The scientist who proposed the planetary model of atom was

A. Ernest Rutherford

B. J.J. Thomson

C. Niels Bohr

D. Dalton

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Correct Answer: Option A

Explanation:
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.

This question belongs to: Science Physics

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