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If the mass of a substance remains constant, then the density of the substance will increase with an increase in its volume.

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Important Questions on Some Basic Concepts of Chemistry

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

Dimensional formula for thermal conductivity is (here

K

denotes the temperature):

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

The temperature of an object is $60 ° C .$ Its value in Fahrenheit scale is

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

A student measured the length of a rod and wrote it as 3.50 cm. Which instrument did he use to measure it ?

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

The time period of a body undergoing simple harmonic motion is given by

T = p^{a} D^{b} S^{c},

where

p

is the pressure,

D

is density and

S

is surface tension. The values of

a, b

and

c

respectively are

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

The units nanometer and picometer are related as,

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

Among the following, the correct statement is :

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

A beaker contains a fluid of density

ρ

\frac{k g}{m^{3}}

, specific heat

S \frac{J}{k g^{o} C}

and viscosity

η

. The beaker is filled up to height h. To estimate the rate of heat transfer per unit area

(\frac{\dot{Q}}{A})

by convection when beaker is put on a hot plate, a student proposes that it should depend on

η

(\frac{S Δ θ}{h})

and

(\frac{1}{ρ g})

when

Δ θ

(

{i n}^{o} C

) is the difference in the temperature between the bottom and top of the fluid. In that situation the correct option for

(\frac{\dot{Q}}{A})

is:

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

The angular diameter of a planet measured from earth is

90 " .

If the diameter of the planet is

π \times 10^{6} m,

then its distance from the earth is

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

A hot air balloon with a payload rises in the air. Assume that the balloon is spherical in shape with diameter of

11.7 m

and the mass of the ballon and the payload (without the hot air inside) is

210 kg

Temperature and pressure of outside air are

27 ° C

and 1 atm

= 10^{5} N / m^{2}

, respectively. Molar mass of dry air is

30 g

. The temperature of the hot air inside is close to [The gas constant,

R = 831 {JK}^{- 1} {mol}^{- 1}

]

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

The nearest star to our solar system is

4.3

light years away. The distance of this star in Parsec is (Mean distance between the earth and the sun

= 1.5 \times 10^{11} m

and one light year

= 9.46 \times 10^{15} m)

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

The number of significant figures in

50000.020 \times 10^{- 3}

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

What is the density of water vapour at boiling point of water?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

The number of significant figures in

0.00340

is _________

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

Which two of the following quantities are dimensionally equivalent?

(i) Force
(ii) Pressure
(iii) Young's Modulus
(iv) Energy

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

Using the rules for significant figures, the correct answer for the expression

\frac{0.02858 \times 0.112}{0.5702}

will be:

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

One angstrom

(\overset{\circ}{A})

is equal to:

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

Experimentally it was found that a metal oxide has formula

M_{0.98} O .

Metal

M

is present as

M^{2 +}

adn

M^{3 +}

in its oxide. Fraction of the metal which exists as

M^{3 +}

would be :

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

What is the

SI

unit of density?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

The dimension of light year

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement

0.27 g

of a long chain fatty acid was dissolved in

100 {c m}^{3}

of hexane.

10 m L

of this solution was added dropwise to the surface of water in a round watch glass. Hexane evaporates and a monolayer is formed. The distance from edge to centre of the watch glass is

10 c m

. What is the height of the monolayer?
[Density of fatty acid

= 0.9 g c m^{- 3}; π = 3]

If the mass of a substance remains constant, then the density of the substance will increase with an increase in its volume.

Important Questions on Some Basic Concepts of Chemistry

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