EASY

Earn 100

Which of the following are correct statements?

$(a)$ Precision refers to closeness of various measurements for the same quantity.

$(b)$ Accuracy is the agreement of particular value to the true value of the result.

$(c)$ Accuracy is closeness of various measurements for the same quantity

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Important Questions on Some Basic Concepts of Chemistry

MEDIUM

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

Which of the following have same number of significant figures?
(A)

0.00253

(B)

1.0003

(C)

15.0

(D)

163

Choose the correct answer from the options given below

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:

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

EASY

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

The number of significant figures in

4.023

MEDIUM

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

Three successive measurements in an experiment gave the values 10.9, 11.4042 and 11.42. The correct way of reporting the average value is-

EASY

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

The number of significant figures in

0.00340

is _________

EASY

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

What is the

SI

unit of density?

EASY

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

The units nanometer and picometer are related as,

EASY

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

Among the following, the correct statement is :

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}

EASY

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

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]

EASY

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

The number

0.004

has significant figures equal to

EASY

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

The length, breadth and thickness of a metal block is given by

l = 12

cm,

b = 6 c m

t = 2.45

cm. The volume of the block is (according to significant figures)

EASY

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

At what temperature will both Celsius and Fahrenheit scales read the same value?

EASY

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

At the surface of a certain planet, acceleration due to gravity is one-quarter of that on earth. If a brass ball is transported to this planet, then which one of the following statements is not correct?

EASY

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

How many significant figures are there in
(a)

73.000 g

(b)

0.0503 g

and (c)

2.001 s

?(respectively)

EASY

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

1 Wb m^{- 2}

is equal to

MEDIUM

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

Let

(3.00 \times 2.303) + 10 .00 =

Z, so the number of significant figures in Z is -------.

HARD

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

100^{\circ} C

and

1 atm

, if the density of the liquid water is

1.0 g {cm}^{- 3}

and that of water vapour is

0.0006 g {cm}^{- 3}

, then the volume occupied in

{cm}^{3}

by water molecules in

1 L

of steam at this temperature is

b {cm}^{3}

. The value of

10 b

is (nearest integer).

Which of the following are correct statements? a Precision refers to closeness of various measurements for the same quantity. b Accuracy is the agreement of particular value to the true value of the result. c Accuracy is closeness of various measurements for the same quantity

Important Questions on Some Basic Concepts of Chemistry

Learn and Prepare for any exam you want !

Which of the following are correct statements?

$(a)$ Precision refers to closeness of various measurements for the same quantity.

$(b)$ Accuracy is the agreement of particular value to the true value of the result.

$(c)$ Accuracy is closeness of various measurements for the same quantity