A transformer steps up 220 V to 2200 V. The turn ratio (secondary to primary) is MCQ with Answer and Explanation

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A transformer steps up 220 V to 2200 V. The turn ratio (secondary to primary) is

A. 10:1

B. 220:1

C. 1:1

D. 1:10

Answer: Option A

Solution (By JKSSB Mock Tests)

For ideal transformer, V_s/V_p = N_s/N_p. So N_s/N_p = 2200/220 = 10. So secondary turns 10 times primary. Ratio 10:1. Step-up increases voltage.

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Question #1

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When white light passes through a glass prism, it splits into a spectrum of seven colors. Which color deviates the least?

A. Blue

B. Violet

C. Yellow

D. Red

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Correct Answer: Option D

Explanation:
Dispersion occurs because different colors of light travel at slightly different speeds inside the glass prism, meaning they have different refractive indices. Red light has the longest wavelength, the lowest refractive index in glass, and therefore deviates (bends) the least. Violet has the shortest wavelength and deviates the most.

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Question #2

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An object is placed at the centre of curvature of a concave mirror. The image formed is

A. Real, inverted, diminished

B. Virtual, inverted, same size

C. Real, inverted, same size

D. Virtual, erect, magnified

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Correct Answer: Option C

Explanation:
At C (centre of curvature), image is at C, real, inverted, same size. At F, image at infinity. Beyond C, between F and C, diminished. Object between F and C gives beyond C, enlarged.

This question belongs to: Science Physics