A convex lens is placed in water. Its focal length MCQ with Answer and Explanation

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A convex lens is placed in water. Its focal length

A. Becomes zero

B. Remains same

C. Increases

D. Decreases

Answer: Option C

Solution (By JKSSB Mock Tests)

Refractive index relative to water decreases, so power decreases, focal length increases.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1

The speed of light in vacuum is approximately

A. 3 × 10⁴ m/s

B. 3 × 10⁶ km/s

C. 3 × 10⁸ m/s

D. 3 × 10⁵ m/s

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Correct Answer: Option C

Explanation:
3×10⁸ m/s = 3×10⁵ km/s.

This question belongs to: Science Physics

Question #2

Which of the following colours has the longest wavelength?

A. Blue

B. Red

C. Green

D. Violet

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Correct Answer: Option B

Explanation:
Visible spectrum: red ~700 nm, orange, yellow, green, blue, indigo, violet ~400 nm. Red has longest wavelength, lowest frequency. Violet shortest wavelength, highest frequency. Remember VIBGYOR.

This question belongs to: Science Physics

Question #3

The unit of electric current in CGS system is

A. Abcoulomb

B. Statampere

C. Ampere

D. Coulomb

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Correct Answer: Option B

Explanation:
CGS electrostatic unit of current is statampere. EMU is abampere. SI is ampere.

This question belongs to: Science Physics

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