EASY
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The number, 0.00001465 can be correctly expressed in scientific notation as

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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
The number of significant figures in 4.023 is
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 0.02858×0.1120.5702 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 0.00340 is _________
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-
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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
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 number of significant figures in 50000.020×10-3 is                   
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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 :
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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

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 cm3 of hexane. 10 mL  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 cm . What is the height of the monolayer?
[Density of fatty acid =0.9 g cm-3;π=3] 
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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 cm, t=2.45 cm. The volume of the block is (according to significant figures)
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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement
The number 0.004 has significant figures equal to
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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?
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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)
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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 (3.00×2.303)+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
At 100∘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 cm3 by water molecules in 1 L of steam at this temperature is b cm3. The value of 10b is (nearest integer).
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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Measurement of Matter and Uncertainty in Measurement
In which of the following numbers all zeros are significant?