Free Measurements MCQs with Answers
262 Measurements MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Physical quantities are expressed with SI base and derived units, while measurement limits are described through accuracy, precision, absolute and percentage error, and significant figures. Dimensional analysis checks equations, derives relationships and detects inconsistent units, but it cannot determine numerical constants or distinguish quantities with identical dimensions.
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262 questions · page 12 of 14
221. 1 joule is equal to:
- A. 104 ergs
- B. 105 ergs
- C. 106 ergs
- D. 107 ergs
Explanation: One Joule is the amount of work done when a force of 1 newton displaces a mass through a distance of 1 meter in the direction of the force…
Correct answer: 107 ergs- A. Distance travelled by earth in one year
- B. Distance travelled by star in one year
- C. Distance travelled by light in one year
- D. Distance travelled by light in one galactic year
Explanation: The following is the solution:Option C is correct since it gives the right definition of one light year.Option A is incorrect since it…
Correct answer: Distance travelled by light in one year- A. (Amperes)2ohm
- B. Joules/ sec
- C. Amperes x volts
- D. Amperes/volt
Explanation: Power is measured in watts. P = I x V (power is current times voltage) and it is NOT current divided by voltage.
Correct answer: Amperes/volt- A. Only the variables in the equation
- B. Only the constants in the equation
- C. The correctness of an equation
- D. Both constants and variables in the equation
Explanation: The principle of homogeneity of dimensions states that for an equation to be dimensionally correct, every term must have the same…
Correct answer: The correctness of an equation- A. A
- B. B
- C. C
- D. D
Explanation: The following is the solution:𝑃𝑟𝑒𝑠𝑠𝑢𝑟𝑒 = 𝐹𝑜𝑟𝑐𝑒/𝐴𝑟𝑒𝑎By dimensional analysis: 𝑃𝑟𝑒𝑠𝑠𝑢𝑟𝑒 = 𝑘𝑔. 𝑚.
Correct answer: D- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: T=2πgl The period of a simple pendulum is given by T = 2 gl, where l is the length of the pendulum and g is the acceleration due to…
Correct answer: Option C- A. Systematic error
- B. Zero error
- C. Precise error
- D. Random Error
Explanation: Parallax error is due to the positioning of the eye while recording a value.
Correct answer: Random Error- A. Kg ms-2
- B. Kgm2s-2
- C. Kgm2s-3
- D. None of these
Explanation: According to Newton's 2nd lawF=maWhere F is force , m is mass and a is acceleration .
Correct answer: Kg ms-2- A. Giga
- B. Tera
- C. Mega
- D. Deca
Explanation: The correct answer is Tera, as it represents 1012, the largest power of ten among the options.
Correct answer: Tera- A. Ampere
- B. Volt
- C. Coulomb
- D. Calorie
Explanation: The correct answer is Coulomb, which is the SI unit used to measure electric charge.
Correct answer: Coulomb- A. Am
- B. Js-1
- C. As
- D. C
Explanation: In terms of SI base units, 1 C is the equivalent of 1 ampere-second, which can be expressed as 1 C = 1 A ⋅ 1 s (or C = A ⋅ s).
Correct answer: As- A. Base Quantities
- B. Physical Quantities
- C. Derived Quantities
- D. Supplementary Quantities
Explanation: Physical Quantities, by definition, are quantities that can be measured with the help of an instrument to give a numerical value with a…
Correct answer: Physical Quantities- A. T-2
- B. LT-2
- C. LT-1
- D. M1T-2
Explanation: Angular acceleration (α) is defined as the rate of change of angular velocity (ω) with respect to time (t). Therefore, α = Δω/Δt.
Correct answer: T-2- A. (MLT)
- B. (M2 42 L)
- C. (ML2 T-2)
- D. (ML2 T2)
Explanation: The SI unit for torque is the Newton-metre or kgm2sec-2. Torque has the dimension of force times distance, symbolically T−2L2M.
Correct answer: (ML2 T-2)- A. strain
- B. refractive index
- C. magnification
- D. All of these
Explanation: The given dimensions indicate a dimensional quantity. Strain = change in length/original length [L]/[L] =1 so it is dimensionless…
Correct answer: All of these- A. angular momentum
- B. power
- C. impulse
- D. viscosity
Explanation: The dimensions ML-1T-1 indeed correspond to viscosity. The correct explanation for option D is as follows:Viscosity is a property of…
Correct answer: viscosity- A. Second
- B. Weber
- C. Henry
- D. Tesla
Explanation: The product of Ohm (unit of resistance) and Farad (unit of capacitance) results in the unit of time, which is the second.
Correct answer: Second- A. 2%
- B. 8%
- C. 4%
- D. 10%
Explanation: 4%: As mentioned earlier, the maximum error in the calculated density is the sum of the errors in measuring the mass and diameter, which…
Correct answer: 4%- A. Four
- B. Five
- C. Two
- D. Three
Explanation: Five: There are five significant figures in 4.0030. All the digits (4, 0, 0, 3, and 0) are non-zero and the trailing zero after the…
Correct answer: Five- A. 4.8%
- B. 3.2%
- C. 1.6%
- D. 0.8%
Explanation: The uncertainty in a measurement involving exponentiation is multiplied by the exponent.
Correct answer: 3.2%