Two resistance wires of same material and same length have diameters in ratio 2:1. Their resistances are in ratio MCQ with Answer and Explanation

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Two resistance wires of same material and same length have diameters in ratio 2:1. Their resistances are in ratio

A. 1:4

B. 4:1

C. 2:1

D. 1:2

Answer: Option A

Solution (By JKSSB Mock Tests)

R ∝ L/A ∝ 1/d². So R₁/R₂ = (d₂/d₁)² = (1/2)² = 1/4 = 1:4.

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Question #1

The decimal equivalent of binary number 1101 is

A. 13

B. 9

C. 15

D. 11

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Correct Answer: Option A

Explanation:
1×8 + 1×4 + 0×2 + 1×1 = 13.

This question belongs to: Science Physics

Question #2

The density of a substance is 8 g/cm³. In SI, it is

A. 8 kg/m³

B. 80 kg/m³

C. 800 kg/m³

D. 8000 kg/m³

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Correct Answer: Option D

Explanation:
1 g/cm³ = 1000 kg/m³, so 8 g/cm³ = 8000 kg/m³.

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Question #3

The number of base SI units is

A. 8

B. 6

C. 5

D. 7

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Correct Answer: Option D

Explanation:
Seven base units: metre, kilogram, second, ampere, kelvin, mole, candela. All other units derived. This is standard definition. Supplementary units radian and steradian now considered dimensionless derived units.

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