A fuse is rated 5 A. Maximum power at 250 V that can be drawn is MCQ with Answer and Explanation

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A fuse is rated 5 A. Maximum power at 250 V that can be drawn is

A. 50 W

B. 1250 W

C. 5000 W

D. 250 W

Answer: Option B

Solution (By JKSSB Mock Tests)

P = V I = 250×5 = 1250 W.

This question belongs to: Science Physics

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Question #1

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An electric iron draws 5 A at 220 V. Its power is

A. 1100 W

B. 2200 W

C. 44 W

D. 550 W

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Correct Answer: Option A

Explanation:
P = V×I = 220 × 5 = 1100 W = 1.1 kW. Energy consumed in 2 hours = 2.2 kWh. Simple.

This question belongs to: Science Physics

Question #2

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A piece of ice floats in water with 1/10 of its volume above water. The density of ice is

A. 0.5 g/cm³

B. 0.9 g/cm³

C. 1.0 g/cm³

D. 0.8 g/cm³

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Correct Answer: Option B

Explanation:
Fraction of volume submerged = ρ_ice / ρ_water. If 1/10 above, 9/10 submerged. So ρ_ice/ρ_water = 9/10 => ρ_ice = 0.9 g/cm³. Density of ice is 0.9 g/cm³.

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Question #3

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The force on a current-carrying conductor in a magnetic field is maximum when the conductor is

A. Parallel to field

B. At 45°

C. Perpendicular to field

D. At 60°

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Correct Answer: Option C

Explanation:
F = BIL sinθ. Maximum when θ = 90° (sin90°=1), so perpendicular. Parallel (θ=0°) force zero. This is the motor effect, used in electric motor.

This question belongs to: Science Physics

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