HARD

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In the final answer of the expression

$\frac{(29.2 - 20.2) (1.79 \times 10^{5})}{1.37}$

the number of significant figures is :

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Important Questions on Some Basic Concepts of Chemistry

EASY

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

The number of significant figures in

4.023

MEDIUM

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

The percentage errors in quantities

P

Q

R

and

S

are

0.5 %

1 %

3 %

and

1.5 %

respectively in the measurement of a physical quantity

A= \frac{P^{3} Q^{2}}{\sqrt{R} S}

. The maximum percentage error in the value of

A

will be:

EASY

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

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

MEDIUM

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

The diameter and height of a cylinder are measured by a meter scale to be

12 .6 \pm 0 .1 cm

and

34 .2 \pm 0 .1 cm

, respectively. What will be the value of its volume in appropriate significant figures?

EASY

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

What is the

SI

unit of density?

MEDIUM

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

The length and width of a rectangular room are measured to be

(3 .95 \pm 0 .05) m

and

(3 .05 \pm 0 .05) m

, respectively, the area of the floor is

EASY

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

Among the following, the correct statement is :

EASY

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

The number of significant figures in

50000.020 \times 10^{- 3}

MEDIUM

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

If one takes into account the finite mass of the proton, the correction to the binding energy of the hydrogen atom is approximately (mass of proton

= 1 .60 \times 10^{- 27} kg,

mass of an electron

= 9 .10 \times 10^{- 31} kg

)

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>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-

MEDIUM

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

In an experiment, the mass of an object is measured by applying a known force on it, and then measuring its acceleration. If in the experiment, the measured values of applied force and the measured acceleration are

F = (10.0 \pm 0.2) N

and

a = (1.00 \pm 0.01) m s^{- 2},

respectively, the mass of the object is

MEDIUM

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

In an experiment on a simple pendulum to determine the acceleration due to gravity, the student measures the length of the thread as

63.2 cm

and diameter of the pendulum bob as

2.256 cm .

The student should take the length of the pendulum to be

MEDIUM

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

In a simple pendulum experiment for determination of acceleration due to gravity

(g)

, time taken for

20

oscillations is measures by using a watch of

1

second least count. The mean value of time taken comes out to be

30 s

. The length of the pendulum is measured by using a meter scale of least count

1 m m

and the value obtained is

55.0 c m

. The percentage error in the determination of

g

is close to

EASY

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

A physical quantity $P$ is described by the relation $P = a^{\frac{1}{2}} b^{2} c^{3} d^{- 4}$ . If the relative errors in the measurement of $a$ , $b$ , $c$ and $d$ respectively, are $2 %$ , $1 %$ , $3 %$ and $5 %$ . Then the relative error in $P$ will be:

EASY

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

The number of significant figures in

0.00340

is _________

EASY

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

The units nanometer and picometer are related as,

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>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]

In the final answer of the expression (29.2 − 20.2) (1.79 × 10 5 ) 1.37 the number of significant figures is :

Important Questions on Some Basic Concepts of Chemistry

Learn and Prepare for any exam you want !

In the final answer of the expression

$\frac{(29.2 - 20.2) (1.79 \times 10^{5})}{1.37}$

the number of significant figures is :