The energy source of the Sun is MCQ with Answer and Explanation

The energy source of the Sun is
A. Chemical reaction
B. Gravitational collapse
C. Nuclear fusion
D. Nuclear fission
Answer: Option C
Solution (By JKSSB Mock Tests)
Hydrogen fusion to helium releases energy.

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Practice More Physics Questions

Question #1
Uniform acceleration: v-t graph is:
A. Horizontal line
B. Hyperbola
C. Straight line with slope
D. Parabola

Correct Answer: Option C


Explanation:
a = constant ⇒ v = u + at (linear in t). Slope = acceleration. Memory tip: 'v-t slope = acceleration; area = displacement'. Graph interpretation frequently tested in competitive kinematics sections.

This question belongs to: Science Physics
Question #2
A wire of resistance R is cut into three equal parts. These parts are then connected in parallel. The equivalent resistance is
A. 3R
B. R
C. R/9
D. R/3

Correct Answer: Option C


Explanation:
Each part resistance = R/3. Three such in parallel: 1/R_eq = 3/(R/3) = 9/R => R_eq = R/9. For n equal parts cut and connected parallel, R_eq = R/n².

This question belongs to: Science Physics
Question #3
The electrical resistance of a conductor depends on its
A. Magnetic property
B. Transparency
C. Colour
D. Length and area of cross-section

Correct Answer: Option D


Explanation:
R = ρL/A, depends on length (L), cross-sectional area (A), and resistivity (ρ) which depends on material and temperature. Not on colour or transparency.

This question belongs to: Science Physics