Assertion (A): A convex mirror is used as a rear-view mirror. Reason (R): It gives a wider field of view. MCQ with Answer and Explanation

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Assertion (A): A convex mirror is used as a rear-view mirror. Reason (R): It gives a wider field of view.

A. Both A and R true, R not correct explanation

B. A true, R false

C. Both A and R true, R correct explanation

D. A false, R true

Answer: Option C

Solution (By JKSSB Mock Tests)

Convex mirror provides wider field and erect image, so R explains A correctly.

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Question #1

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A car moving at 72 km/h is brought to rest in 10 seconds. The deceleration is

A. 2 m/s²

B. 2.5 m/s²

C. 7.2 m/s²

D. 20 m/s²

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Correct Answer: Option A

Explanation:
72 km/h = 72 × (5/18) = 20 m/s. Initial velocity u = 20 m/s, final v = 0, t = 10 s. Using v = u + at => 0 = 20 + a×10 => a = -2 m/s², so deceleration magnitude is 2 m/s². Conversion factor 5/18 is essential: multiply km/h by 5/18 to get m/s.

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Question #2

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The energy possessed by a body due to its position or configuration is called

A. Kinetic energy

B. Potential energy

C. Thermal energy

D. Nuclear energy

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Correct Answer: Option B

Explanation:
Potential energy: gravitational (mgh), elastic (½kx²). Kinetic energy due to motion. Total mechanical energy sum conserved in conservative forces.

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Question #3

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Assertion (A): A convex mirror is used as a rear-view mirror in vehicles. Reason (R): A convex mirror always forms a virtual, erect, and diminished image, giving a wider field of view.

A. Both A and R are true and R is the correct explanation of A.

B. A is true but R is false.

C. Both A and R are true but R is NOT the correct explanation of A.

D. A is false but R is true.

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Correct Answer: Option A

Explanation:
Convex mirrors bulge outwards, which inherently provides a much wider field of view compared to plane mirrors. Regardless of the object's position, a convex mirror reliably produces virtual, erect, and diminished (smaller) images. This allows a driver to see a large area of the road behind them in a small mirror, making R the exact explanation for A.

This question belongs to: Science Physics

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