The least count of a standard vernier calliper is generally MCQ with Answer and Explanation
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Question #1
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Electromagnetic induction was discovered by
Correct Answer: Option D
Explanation:
Michael Faraday discovered electromagnetic induction in 1831: changing magnetic field induces emf. Oersted discovered magnetic effect of current. Ampere gave laws of magnetic force between currents. Coulomb for electrostatics.
Michael Faraday discovered electromagnetic induction in 1831: changing magnetic field induces emf. Oersted discovered magnetic effect of current. Ampere gave laws of magnetic force between currents. Coulomb for electrostatics.
Question #2
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Alpha particles are
Question #3
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The time period of a simple pendulum is measured as 2.0 s with an error of 0.1 s. The percentage error in the calculated value of g is approximately:
Correct Answer: Option C
Explanation:
Pendulum period T = 2π√(l/g) ⇒ g = 4π²l/T². For error propagation, % error in g = % error in l + 2 × % error in T. Assuming l measured precisely, % error in g ≈ 2 × (% error in T). % error in T = (0.1/2.0)×100% = 5%. Thus % error in g ≈ 2×5% = 10%. Memory tip: 'g ∝ 1/T² ⇒ %Δg = 2 × %ΔT'. This error analysis problem tests experimental physics skills, frequently appearing in competitive exams. Always apply power rule for error propagation: if Q ∝ xⁿ, %ΔQ = |n| × %Δx.
Pendulum period T = 2π√(l/g) ⇒ g = 4π²l/T². For error propagation, % error in g = % error in l + 2 × % error in T. Assuming l measured precisely, % error in g ≈ 2 × (% error in T). % error in T = (0.1/2.0)×100% = 5%. Thus % error in g ≈ 2×5% = 10%. Memory tip: 'g ∝ 1/T² ⇒ %Δg = 2 × %ΔT'. This error analysis problem tests experimental physics skills, frequently appearing in competitive exams. Always apply power rule for error propagation: if Q ∝ xⁿ, %ΔQ = |n| × %Δx.
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