The core of a transformer is laminated to reduce MCQ with Answer and Explanation

The core of a transformer is laminated to reduce
A. Hysteresis loss
B. Eddy current loss
C. Flux leakage
D. Copper loss
Answer: Option B
Solution (By JKSSB Mock Tests)
Lamination of core increases resistance to circulating eddy currents, reducing eddy current losses (I²R). Hysteresis loss reduced by using soft iron. Copper loss is in windings. Lamination is insulation between layers.

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Practice More Physics Questions

Question #1
The mass of an electron is approximately
A. 9.11 × 10⁻²⁷ kg
B. 1.67 × 10⁻³¹ kg
C. 1.67 × 10⁻²⁷ kg
D. 9.11 × 10⁻³¹ kg

Correct Answer: Option D


Explanation:
Electron mass 9.11×10⁻³¹ kg, proton ~1.67×10⁻²⁷ kg.

This question belongs to: Science Physics
Question #2
The frequency of infrasound is
A. Below 20 Hz
B. Below 10 Hz
C. 20 Hz - 20 kHz
D. Above 20 kHz

Correct Answer: Option A


Explanation:
Infrasound < 20 Hz, ultrasound > 20 kHz.

This question belongs to: Science Physics
Question #3
A ball is dropped from a height of 20 m. Time to reach ground (g=10) is
A. 4 s
B. 1 s
C. 3 s
D. 2 s

Correct Answer: Option D


Explanation:
h = ½gt² => t = √(2h/g) = √(40/10) = √4 = 2 s. Free fall formula. Final velocity v = gt = 20 m/s.

This question belongs to: Science Physics