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Central Exam — General Science — Physics

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Showing 101–106 of 106 questions in Physics

Q.101 Medium Physics

Two capacitors of 2 μF and 3 μF are connected in series. What is the equivalent capacitance?

A 5 μF

B 1.2 μF

C 6 μF

D 0.5 μF

Correct Answer: B. 1.2 μF

Explanation:

For capacitors in series: 1/C = 1/C₁ + 1/C₂ = 1/2 + 1/3 = 5/6. Therefore C = 6/5 = 1.2 μF.

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Q.102 Easy Physics

Which of the following has the highest refractive index?

A Air

B Water

C Diamond

D Glass

Correct Answer: C. Diamond

Explanation:

Refractive indices: Air ≈ 1, Water ≈ 1.33, Glass ≈ 1.5, Diamond ≈ 2.42. Diamond has the highest refractive index among these options.

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Q.103 Medium Physics

A body moves in a circle of radius 5 m with constant speed 10 m/s. What is the centripetal acceleration?

A 2 m/s²

B 20 m/s²

C 50 m/s²

D 100 m/s²

Correct Answer: B. 20 m/s²

Explanation:

Centripetal acceleration a = v²/r = (10)²/5 = 100/5 = 20 m/s².

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Q.104 Easy Physics

A current of 5 A flows through a resistor for 10 seconds. How much charge passes through it?

A 0.5 C

B 2 C

C 50 C

D 500 C

Correct Answer: C. 50 C

Explanation:

Charge Q = I × t, where I = 5 A and t = 10 s. Q = 5 × 10 = 50 Coulombs.

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Q.105 Hard Physics

An electron undergoes a transition from n=3 to n=1 in a hydrogen atom. Which series does this transition belong to?

A Paschen series

B Balmer series

C Lyman series

D Brackett series

Correct Answer: C. Lyman series

Explanation:

The Lyman series involves transitions to n=1 from higher energy levels. Balmer series ends at n=2, Paschen at n=3, and Brackett at n=4.

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Q.106 Hard Physics

An object of mass 2 kg experiences a net force of 10 N. If it starts from rest, what will be its velocity after traveling 5 m?

A 5 m/s

B √50 m/s

C 10 m/s

D √5 m/s

Correct Answer: A. 5 m/s

Explanation:

Using F = ma: a = F/m = 10/2 = 5 m/s². Using v² = u² + 2as: v² = 0 + 2(5)(5) = 50. v = √50 ≈ 7.07 m/s. Checking options again using work-energy: Work = KE; 10×5 = (1/2)(2)v²; v = 5√2 m/s. The closest correct approach gives v² = 50, so v = 5√2 m/s or approximately 7.07 m/s. Option B matches √50.

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