Which of the following is a vector quantity? MCQ with Answer and Explanation

Which of the following is a vector quantity?
A. Resistance
B. Magnetic flux
C. Magnetic field intensity
D. Electric potential
Answer: Option C
Solution (By JKSSB Mock Tests)
Magnetic field intensity (H) and magnetic field (B) are vectors. Magnetic flux is scalar (Φ = B·A). Resistance scalar, potential scalar. Vector quantities have direction. Current has direction but adds by scalar law, considered tensor sometimes but in basic physics not vector.

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Question #1
A fuse wire has
A. High melting point, high resistance
B. Low melting point, high resistance
C. High melting point, low resistance
D. Low melting point, low resistance

Correct Answer: Option B


Explanation:
Fuse wire must melt easily (low MP) and develop enough heat (high R) to break circuit on overload.

This question belongs to: Science Physics
Question #2
Rainbow formation involves:
A. Refraction only
B. Dispersion and total internal reflection
C. Reflection only
D. Diffraction

Correct Answer: Option B


Explanation:
Rainbow: sunlight enters raindrop (refraction + dispersion), reflects internally (TIR), exits with further refraction. Primary rainbow: one TIR; secondary: two TIRs. Memory tip: 'Rainbow = refraction + dispersion + TIR in water droplets'. Application question testing atmospheric optics, frequently appearing in competitive exams.

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Question #3
The mass of an electron is approximately
A. 9.11 × 10⁻²⁷ kg
B. 1.67 × 10⁻³¹ kg
C. 9.11 × 10⁻³¹ kg
D. 1.67 × 10⁻²⁷ kg

Correct Answer: Option C


Explanation:
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This question belongs to: Science Physics