The phenomenon of bouncing back of light from a surface is called MCQ with Answer and Explanation
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Question #1
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Resistance of wire: R = ρL/A. If length tripled and area doubled, new R is:
Correct Answer: Option B
Explanation:
R' = ρ(3L)/(2A) = (3/2)(ρL/A) = 1.5R. Resistance scales directly with length, inversely with area. Memory aid: 'R ∝ L/A; changes multiply'. Proportional reasoning problem testing resistance formula, frequently appearing in competitive electricity sections.
R' = ρ(3L)/(2A) = (3/2)(ρL/A) = 1.5R. Resistance scales directly with length, inversely with area. Memory aid: 'R ∝ L/A; changes multiply'. Proportional reasoning problem testing resistance formula, frequently appearing in competitive electricity sections.
Question #2
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The physical quantity having unit henry is
Question #3
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In the SI system, what are the fundamental units of momentum?
Correct Answer: Option B
Explanation:
Momentum (p) is defined as the product of mass (m) and velocity (v). p = m × v. The SI unit of mass is the kilogram (kg) and the SI unit of velocity is meters per second (m/s or m s⁻¹). Therefore, the SI unit of momentum is kg m/s or kg m s⁻¹.
Momentum (p) is defined as the product of mass (m) and velocity (v). p = m × v. The SI unit of mass is the kilogram (kg) and the SI unit of velocity is meters per second (m/s or m s⁻¹). Therefore, the SI unit of momentum is kg m/s or kg m s⁻¹.
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