Heat from the Sun reaches Earth by MCQ with Answer and Explanation

Heat from the Sun reaches Earth by
A. Convection
B. Radiation
C. Conduction
D. Evaporation
Answer: Option B
Solution (By JKSSB Mock Tests)
Vacuum of space, only radiation (electromagnetic waves) can transfer heat.

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Practice More Physics Questions

Question #1
A person cannot see objects clearly beyond 2 m. This defect of vision is:
A. Astigmatism
B. Hypermetropia
C. Presbyopia
D. Myopia

Correct Answer: Option D


Explanation:
Myopia (nearsightedness) is the inability to see distant objects clearly, with far point less than infinity. Here, far point is 2 m. Corrected using concave lens. Hypermetropia (farsightedness) affects near vision; presbyopia is age-related loss of accommodation; astigmatism involves uneven corneal curvature. Memory aid: 'Myopia = near-sighted; far point reduced'. This application question tests knowledge of vision defects and corrections, frequently appearing in competitive exams. Always link symptom (blurred distant vision) to defect (myopia) and correction (diverging lens).

This question belongs to: Science Physics
Question #2
A lens has power +1 D. Its focal length in cm is
A. 10 cm
B. 100 cm
C. 1 cm
D. 0.1 cm

Correct Answer: Option B


Explanation:
f = 1/P = 1 m = 100 cm.

This question belongs to: Science Physics
Question #3
The temperature coefficient of resistance of a semiconductor is
A. Infinite
B. Negative
C. Zero
D. Positive

Correct Answer: Option B


Explanation:
Resistance decreases with temperature for semiconductors, so α negative.

This question belongs to: Science Physics