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NEET UG Units and Measurement — practice questions — page 3

Explore 92 free Units and Measurement questions in NEET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Units and Measurement questions and exercises with answers

Showing questions 61–90 of 92.

The argument of sin, log or exp in a physics formula must be what?Read the answer and worked solution →What are the dimensions of refractive index?Read the answer and worked solution →An equation whose terms have unequal dimensions must be what?Read the answer and worked solution →Which task can dimensional analysis NOT do?Read the answer and worked solution →When computing derived quantities, how are units treated?Read the answer and worked solution →What is one advantage of a dimensional check over a units check?Read the answer and worked solution →What is the dimensional formula of linear momentum?Read the answer and worked solution →From F = Gm1m2/r², the dimensions of G are?Read the answer and worked solution →Since E = hν, Planck's constant h has which dimensions?Read the answer and worked solution →Surface tension is force per unit length. Its dimensional formula is?Read the answer and worked solution →If speed v = At + B/t, what are the dimensions of B?Read the answer and worked solution →Wave speed v on a string depends on tension F and mass per length μ. Then v is proportional to?Read the answer and worked solution →Which organisation coordinates the SI?Read the answer and worked solution →In which year were the newest SI prefixes adopted?Read the answer and worked solution →Which SI prefix is NOT an integer power of 1000?Read the answer and worked solution →A millionth of a metre is correctly called what?Read the answer and worked solution →Which coherent SI unit has a prefix in its name?Read the answer and worked solution →J/K is the coherent SI unit of heat capacity and of which quantity?Read the answer and worked solution →One pascal is equal to what?Read the answer and worked solution →How is a unit named after a person, like newton, written mid-sentence?Read the answer and worked solution →How many nations signed the Metre Convention in 1875?Read the answer and worked solution →Which CGPM adopted the International System of Units in 1960?Read the answer and worked solution →In which year did the mole become the seventh SI base unit?Read the answer and worked solution →Which unit joined the MKS system to form the MKSA system?Read the answer and worked solution →Before 2019, which was the last physical artefact defining an SI unit?Read the answer and worked solution →The electronvolt is a non-SI unit of which quantity?Read the answer and worked solution →Which standard formalises the International System of Quantities?Read the answer and worked solution →Which SI defining constant is described as purely technical?Read the answer and worked solution →When is a derived SI unit called coherent?Read the answer and worked solution →A count of exactly 4 apples has how many significant figures?Read the answer and worked solution →

Worked practice questions

The argument of sin, log or exp in a physics formula must be what?

  1. Of time dimension
  2. Of length dimension
  3. Of energy dimension
  4. Dimensionless
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Correct answer: D. Dimensionless

Special functions such as trigonometric, logarithmic and exponential ones only accept pure numbers.

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What are the dimensions of refractive index?

  1. No dimensions
  2. [M L T⁻¹]
  3. [L T⁻¹]
  4. [L⁻¹ T]
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Correct answer: A. No dimensions

Refractive index is a ratio of two speeds, so the dimensions cancel and it is a pure number.

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An equation whose terms have unequal dimensions must be what?

  1. Definitely correct
  2. Definitely wrong
  3. Valid only in SI
  4. Correct up to a factor
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Correct answer: B. Definitely wrong

Terms of different dimensions cannot be added or equated, so a dimensionally inconsistent equation is definitely wrong.

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More Physics topics

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