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 Β· page 3 of 14
- A. Celsius
- B. Degree
- C. Kelvin
- D. Fahrenheit
Explanation: Kelvin: Kelvin (K) is the base unit of temperature in the International System of Units (SI).
Correct answer: Kelvin- A. 5000 ampere second
- B. 5 x 10^-6 ampere second
- C. 5 x 10^6 coulomb second
- D. 500 coulomb second
Explanation: The following is the solution:Electric charge is a derived quantity, and its base unit is the coulomb (C), which is defined as the chargeβ¦
Correct answer: 5 x 10^-6 ampere second- A. Simultaneous
- B. Homogeneous
- C. Instantaneous
- D. Quadratic
Explanation: A dimension equation is said to be homogeneous, only and only if dimensions of equations are same on both sides.
Correct answer: Homogeneous- A. Pico, Mega, Kilo, Tera
- B. Pico, Micro, Mega, Giga
- C. Tera, Pico, Micro, Kilo
- D. Giga, Kilo, Milli, Nano
Explanation: Pico, Micro, Mega, Giga are the prefixes in increasing order as highlighted below:
Correct answer: Pico, Micro, Mega, Giga- A. Weight
- B. Pressure
- C. Power
- D. Work
Explanation: The following is the solution:As we know that:Power = Work / timeAnd,Work = force Γ distance F = maSo putting all that together:P = m Γ aβ¦
Correct answer: Power- A. Radian
- B. Steradian
- C. Both Radian & Steradian
- D. None of the given options
Explanation: Supplementary quantities are quantities of a circle and a sphere. Supplementary units are those that aren't yet graded as either base orβ¦
Correct answer: Both Radian & Steradian- A. 0.4%
- B. 2%
- C. 3%
- D. 7%
Explanation: The following is the solution:β’The first figures are to be subtracted:1.27-0.83=0.44β’The second figures (least counts) are to beβ¦
Correct answer: 7%- A. Force
- B. Impulse
- C. Acceleration
- D. Velocity
Explanation: The following is the solution:Impulse can be defined as "The sudden force acting on an object for a short interval of time".It is equal toβ¦
Correct answer: Impulse- A. Stress
- B. Strain
- C. Young modulus
- D. Pressure
Explanation: The strain unit is dimensionless. It is the ratio between the length shift and the initial length, so it is unit-less.
Correct answer: Strain- A. The value is accurate but not precise
- B. The value is both accurate and precise.
- C. The value is neither precise nor accurate.
- D. The value is precise but not accurate.
Explanation: The 'true' value of the acceleration of free fall is 9.81 m s-2.From the value given in the question, the acceleration of free fall can beβ¦
Correct answer: The value is accurate but not precise- A. Adjusting am ammeter to remove its zero error before measuring a current.
- B. Measuring several inter modal distance on a standing wave to find the mean inter modal distance
- C. Measuring the diameter of a wire repeatedly and calculating the average.
- D. Timing a large number of oscillation to find a period
Explanation: Systematic error is an error having a non-zero mean, so that its effect is not reduced when observations are averaged.
Correct answer: Adjusting am ammeter to remove its zero error before measuring a current.- A. kg m2s-1
- B. kg m2s-2
- C. kg m-1s-1
- D. kg ms-2
Explanation: The following is the solution:F=krv which is equal to F/rvk=F/rv=kgms-2/m.ms-1=kgm-1s-1.
Correct answer: kg m-1s-1- A. Power
- B. Frequency
- C. Refractive Index
- D. Impulse
Explanation: Refractive index of a medium is the ratio of the speed of light in a vacuum to the speed of light in that particular medium.
Correct answer: Refractive Index- A. Increase 8 times
- B. Increase 16 times
- C. Decrease 16 times
- D. Increase 4 times
Explanation: E=mc2 c=s/t Hence dimensionally, E=ML2T-2 E=(MLT-2)(L) =(4)(MLT-2)(4)(L)=16(ML2T-2)
Correct answer: Increase 16 times- A. KV-1FT-1
- B. KV-1FT
- C. KVF-1T-1
- D. KV-1F-1T
Explanation: The following is the solution: F=Ma a=V/T M=FT/V
Correct answer: KV-1FT- A. 1%
- B. 2%
- C. 3%
- D. 5%
Explanation: The following is the solution: % uncertainty of length= 0.02/2 x 100= 1% % uncertainty of width=0.01/1 x 100= 1% % uncertainty of the areaβ¦
Correct answer: 2%- A. 51.2 cm/sec
- B. 102.4 cm/sec
- C. 204.8 cm/sec
- D. 153.6 cm/sec
Explanation: The following is the solution: Calculation of the error in the speed through inputting the given information in the formulaβ¦
Correct answer: 204.8 cm/sec- A. Magnetic flux
- B. Electric flux
- C. Electric field
- D. Magnetic field
Explanation: The following is the solution: Plancks constant (h) has the units joule-seconds.
Correct answer: Magnetic flux- A. [M0L0T0]
- B. [ML4T-3]
- C. [ML-2T]
- D. [ML6T-3]
Explanation: The following is the solution: b=Ξ»mT, where Ξ»m is the peak wavelength of the black body radiation and T is the surface temperature of theβ¦
Correct answer: [ML4T-3]- A. Energy
- B. Electric charge
- C. Force
- D. Electric power
Explanation: The kilowatt-hour (SI symbol: kWβ h or kW h; commonly written as kWh) is a unit of energy equal to 3600 kilojoules (3.6 megajoules).
Correct answer: Energy