A convex mirror is used as a rear-view mirror because it MCQ with Answer and Explanation

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A convex mirror is used as a rear-view mirror because it

A. Magnifies image

B. Gives wider field of view

C. Inverts image

D. Gives real image

Answer: Option B

Solution (By JKSSB Mock Tests)

Convex mirror diverges rays, gives erect, diminished, virtual image with wider field. Concave would magnify but narrow field. Plane gives normal view. Safety advantage.

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Question #1

The frequency of a seconds pendulum is

A. 1 Hz

B. 0.25 Hz

C. 0.5 Hz

D. 2 Hz

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Correct Answer: Option C

Explanation:
Seconds pendulum has time period of 2 seconds (1 s for half swing). Frequency f = 1/T = 1/2 = 0.5 Hz. Length about 99.4 cm on Earth. Not exactly 1 m.

This question belongs to: Science Physics

Question #2

A nucleus of mass number A and atomic number Z contains

A. A protons and Z neutrons

B. Z protons and A-Z neutrons

C. A-Z protons and Z neutrons

D. Z protons and A neutrons

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Correct Answer: Option B

Explanation:
Atomic number Z = number of protons. Mass number A = protons + neutrons. So neutrons = A - Z. Electrons = Z in neutral atom. Isotopes same Z, different N.

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Question #3

The working of a refrigerator is based on

A. Heating effect of current

B. Evaporation and condensation of refrigerant

C. Photoelectric effect

D. Magnetic effect

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Correct Answer: Option B

Explanation:
Refrigerant evaporates inside absorbing heat, compressed outside releasing heat, cycle repeats.

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