Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 12

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The speed of light in vacuum is given by $3 \times 10^{8} m s^{- 1}$ in the MKS system. If in a new system, the unit of length and time is increased by a factor of $2$ and $4$ , respectively, the numerical value of speed of light in this new system will be

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Important Questions on Physics and Measurement

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Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 13

The dimensions of light year are

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Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 14

Which of the following is dimensionally correct?

MEDIUM

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Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 15

Suppose refractive index

μ

is given as

μ = A + \frac{B}{λ^{2}}

, where

A

and

B

are constants and

λ

is the wavelength, then dimensions of

B

are same as that of

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Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 16

Two quantities, $A$ and $B$ have different dimensions. Which mathematical operation, given below, is physically meaningful?

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Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 17

Which one of the following does not have the same dimensions?

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Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 18

If the speed

v

of a particle, of mass

m

, as a function of time

t

, is given by

v = ω A \sin [(\sqrt{\frac{k}{m}}) t]

, where

A

has dimension of length. Choose the correct option.

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Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 19

Choose the incorrect statement :

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Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 20

The dimensional equation for the electrical resistance of a conductor is