Match the Column I with Column II. Column - I (Event) Column - II (Time interval (in s )) ( A ) Lifetime of an excited state of an atom ( p ) 10 17 ( B ) Average human life-span ( q ) 10 11 ( C ) Age of Egyptian pyramids ( r ) 10 9 ( D ) Age of the universe ( s ) 10 - 8

A – s , B – r , C – q , D – p

A – p , B – q , C – r , D – s

A – q , B – p , C – s , D – r

A – r , B – s , C – p , D – q

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What is the primary function of a radiometer?

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Important Questions on Thermodynamics

EASY

Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

Two spherical black bodies have radii

r_{1}

and

r_{2}

. Their surface temperatures are

T_{1}

and

T_{2}

. If they radiate same power then

\frac{r_{2}}{r_{1}}

EASY

Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

Name the quantities which have no dimension but variable.

EASY

Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

The ratio of one micron to one nanometer is

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Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

Young’s modulus of a material has the same unit as

EASY

Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

Newton \times second

is the unit of:

EASY

Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

watt

is,

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Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

Match the Column I with Column II.

	Column - I (Event)		Column - II (Time interval (in $s$ ))
$(A)$	Lifetime of an excited state of an atom	$(p)$	$10^{17}$
$(B)$	Average human life-span	$(q)$	$10^{11}$
$(C)$	Age of Egyptian pyramids	$(r)$	$10^{9}$
$(D)$	Age of the universe	$(s)$	$10^{- 8}$

EASY

Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

Which one of the following is a fundamental quantity?

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Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

Name the fundamental quantities in mechanics?

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Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

Which of the following ratios express pressure?

EASY

Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

Ampere - hour

is a unit of which of the following quantities.

EASY

Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

The unit of potential energy is

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Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

Unit of self inductance is

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Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

The distance between centres of moon and the earth is about

60

times the radius of the earth. What will be diameter of the earth (approximately in degrees) as seen from the moon?

EASY

Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

Does ratio of same quantity depends upon the system of unit used?

EASY

Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

Erg m^{- 1}

can be the unit for measuring:

EASY

Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

Which of the following represents a

volt

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Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

What are the fundamental quantities? Name them.

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Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

What is a physical quantity? Name all the basic physical quantities.

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Chemistry>Physical Chemistry>Thermodynamics>Measurement of Energy Changes: Calorimetry

The unit of potential energy is_____.

What is the primary function of a radiometer?

Important Questions on Thermodynamics

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