A step-up transformer increases MCQ with Answer and Explanation

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A step-up transformer increases

A. Current

B. Energy

C. Power

D. Voltage

Answer: Option D

Solution (By JKSSB Mock Tests)

Step-up transformer increases voltage and decreases current proportionally (P = V×I constant ideal). Power constant (ignoring losses). Used in power transmission to reduce I²R losses. Step-down decreases voltage.

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Practice More Physics Questions

Question #1

A lactometer is used to check

A. Blood pressure

B. Purity of milk

C. Humidity

D. Purity of water

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Correct Answer: Option B

Explanation:
Measures specific gravity of milk, indicates adulteration.

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Question #2

The efficiency of a machine is 80%. If it lifts a load of 500 N through 2 m, effort applied through 10 m. Effort is

A. 100 N

B. 125 N

C. 80 N

D. 200 N

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Correct Answer: Option B

Explanation:
Work output = 500×2=1000 J. Work input = output/eff = 1000/0.8=1250 J. Effort = Work input / distance = 1250/10 = 125 N.

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Question #3

Work per unit charge to move between points is:

A. Potential energy

B. Electric potential

C. Electric field

D. Capacitance

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Correct Answer: Option B

Explanation:
Potential difference V = W/q: work per unit charge. Electric field E = F/q: force per unit charge. Memory tip: 'Potential = work/charge (scalar); Field = force/charge (vector)'. Electrostatics definition frequently tested in competitive exams.

This question belongs to: Science Physics

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