Choose any one of the following four responses :

(1) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(2) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(3) If assertion is true but reason is false.

(4) If the assertion and reason both are false.

Assertion: Dimensional constants are the quantities whose values are constant.

Reason : Dimensional constants are dimensionless.

Subtopic:  Dimensions |
 55%
From NCERT
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Choose any one of the following four responses :

(1) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(2) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(3) If assertion is true but reason is false.

(4) If the assertion and reason both are false.

Assertion :The time period of a pendulum is given by the formula, T=2πl​/​g.

Reason : According to the principle of homogeneity of dimensions, only that formula is correct in which the dimensions of L.H.S. is equal to dimensions of R.H.S.

Subtopic:  Dimensions |
From NCERT
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Assertion :In the relation f=12lTm, where symbols have standard meaning, m represent linear mass density.

Reason : The frequency has the dimensions of inverse of time.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Dimensions |
 70%
From NCERT
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Choose any one of the following four responses :

(1) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(2) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(3) If the assertion is true but the reason is false.

(4) If the assertion and reason both are false.

Assertion: Avogadro number is the number of atoms in one gram mole.

Reason: Avogadro number is a dimensionless constant.

Subtopic:  Dimensions |
From NCERT
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Choose any one of the following four responses :

(1) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(2) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(3) If assertion is true but reason is false.

(4) If the assertion and reason both are false.

Assertion : The quantity (1/μ0ε0) is dimensionally equal to velocity and numerically equal to velocity of light.

Reason : μ0 is permeability of free space and ε0 is the permittivity of free space.

Subtopic:  Dimensions |
 64%
From NCERT
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The surface tension of a liquid is 70 dyne/cm. In MKS system its value is 

(1) 70 N/m

(2) 7 × 10–2 N/m

(3) 7 × 103 N/m

(4) 7 × 102 N/m

Subtopic:  Dimensions |
 71%
From NCERT
PMT - 1973
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The SI unit of universal gas constant (R) is

(1) Watt K–1 mol–1

(2) Newton K–1 mol–1

(3) Joule K–1 mol–1

(4) Erg K–1 mol–1

Subtopic:  Dimensions |
 78%
From NCERT
PMT - 1987
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The unit of permittivity of free space ε0 is

(1) Coulomb/Newton-metre

(2) Newton-metre2/Coulomb2

(3) Coulomb2/(Newton-metre)2

(4) Coulomb2/Newton-metre2

Subtopic:  Dimensions |
 60%
From NCERT
PMT - 2003
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What are the units of K=1/4πε0

(1) C2N–1m–2

(2) Nm2C–2

(3) Nm2C2

(4) Unitless

Subtopic:  Dimensions |
 69%
From NCERT
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The SI unit of surface tension is

(1) Dyne/cm

(2) Newton/cm

(3) Newton/metre

(4) Newton-metre

Subtopic:  Dimensions |
 83%
From NCERT
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