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Units, Dimensions and Measurement JEE physics - Units, Dimensions and Measurement

CBSE - STD 12 Science - JEE physics (CBSE - English Medium). 318 questions in this chapter.

Question types

Units, Dimensions and Measurement question types

318 questions across 2 question groups — pick any mix to generate a JEE physics paper with step-by-step answer keys.

318
Questions
2
Question groups
5
Question types
Sample Questions

Units, Dimensions and Measurement questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1Assertion & Reason1 Mark
Assertion : The quantity $\left(1 / \sqrt{\mu_0 \varepsilon_0}\right)$ is dimensionally equal to velocity and nemerically equal to velocity of light.
Reason : $\mu_0$ is permeability of free space and $\varepsilon_0$ is the permittivity of free space.
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Q 4Assertion & Reason1 Mark
Assertion : The graph between $P$ and $Q$ is straight line, when $P / Q$ is constant.
Reason : The straight line graph means that $P$ proportional to $Q$ or $P$ is equal to constant multiplied by $Q$.
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Q 5Assertion & Reason1 Mark
Assertion : In the relation $f=\frac{1}{2 l} \sqrt{\frac{T}{m}}$, where symbols have standard meaning, $m$ represent linear mass density.
Reason : The frequency has the dimensions of inverse of time.
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Q 6MCQ1 Mark
The dimensions of electric potential are
  • ✓
    $\left[M L^2 T^{-2} Q^{-1}\right]$
  • B
    $\left[M L T^{-2} Q^{-1}\right]$
  • C
    $\left[M L^2 T^{-1} Q\right]$
  • D
    $\left[M L^2 T^{-2} Q\right]$

Answer: A.

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Q 7MCQ1 Mark
If the velocity of light $$, gravitational constant $(G)$ and Planck's constant (h) are chosen as fundamental units, then the dimensions of mass in new system is
  • A
    $c^{1 / 2} G^{1 / 2} h^{1 / 2}$
  • B
    $c^{1 / 2} G^{1 / 2} h^{-1 / 2}$
  • ✓
    $c^{1 / 2} G^{-1 / 2} h^{1 / 2}$
  • D
    $c^{-1 / 2} G^{1 / 2} h^{1 / 2}$

Answer: C.

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Q 8MCQ1 Mark
Dimensions of luminous flux are
  • A
    $M L^2 T^{-2}$
  • ✓
    $M L^2 T^{-3}$
  • C
    $M L^2 T^{-1}$
  • D
    $M L T^{-2}$

Answer: B.

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Q 9MCQ1 Mark
Which of the following is not a unit of time
  • A
    Leap year
  • B
    Micro second
  • C
    Lunar month
  • ✓
    Light year

Answer: D.

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Q 10MCQ1 Mark
The correct value of $0^{\circ} C$ on the Kelvin scale is
  • ✓
    $273.15 K$
  • B
    $272.85 K$
  • C
    $273 K$
  • D
    $273.2 K$

Answer: A.

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