Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 45

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The dimensional formula $σ b^{4}$ (Here $σ =$ Stefan's constant and $b =$ Wein's constant) is

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Important Questions on Physical World and Measurement

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 46

The equation of state of some gases can be expressed as

(P + \frac{a}{V^{2}}) (V - b) = R T

, where,

P

is the pressure,

V

is the volume,

T

is the absolute temperature and

a

,

b

and

R

are constants. The dimensions of

a

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 47

If

P r e s s u r e = M^{a} L^{b} T^{c}

, then value of

a, b

and

c

will be satisfied

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 48

Among the following options, pick the one which has neither units nor dimensions.

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 49

The unit of potential energy is_____.

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 50

The SI unit of universal gas constant

(R)

is,

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 51

A

watt

is,

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 52

If

u_{1}

and

u_{2}

are the units selected in two systems of measurement and

n_{1}

and

n_{2}

are their numerical values, then

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 53

To determine the Young’s modulus of a wire, the formula is

Y = \frac{F}{A} \times \frac{L}{∆ L}

, where

L =

length,

A =

area of cross-section of the wire,

∆ L =

change in length of the wire when stretched with a force

F

. The conversion factor to change it from CGS to MKS system is