Download Download Now Where does the water present in the egg go after boiling the egg? When an egg is boiled in water, the water present in egg is used in de…

1. The atmospheric pollution is generally measured in the units of (a) mass percentage (b) volume percentage (c) volume fraction (d) ppm (d) ppm 2. Temperature dependent term amo…

कमज़ोर बदला लेते हैं, शक्तिशाली माफ करते हैं और समझदार भुला देते हैं। Weak people take revenge, strong people forgive and sensible people forget. स्नेह वह भाषा है जिसे बहरे भी सुन सकते हैं और गूंगे भी बोल सकते हैं। Love is that language, which th…

What is the capital of France? Paris Rome Berlin Madrid Paris is the capital of France. Who wrote "Romeo and Juliet"? Charles Dickens William Shakespea…

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Table of Contents Contents   One Mark questions with answers   1. What is the significant figures in 1.050 x 10 4 ?  Ans. Four  2. What is the S.I. unit of Density?  Ans. Kg m -3   3. What do mean by Mole fraction?  A…

Table of Contents   Atomic Mass Unit  One atomic mass unit is defined as a mass exactly equal to one twelfth the mass of  one carbon -12 atom. And 1 amu = 1.66056×10 –24 g.  Today, ‘amu’ has been replaced by ‘u’ which is known as…

LAWS OF CHEMICAL COMBINATIONS  Law of Conservation of Mass  (Given by Antoine Lavoisier in 1789). It states that matter (mass) can neither be created nor destroyed .  Law of Definite Proportions or Law of Constant Composition: This law was pro…

Mixtures  A mixture is a combination of two or more elements or compounds in any proportion  so that the components do not lose their identity. Air is an example of a mixture  Mixtures are of two types, homogeneous and heterogeneous.  Homogene…

Scientific Notation  In which any number can be represented in the form N × 10 n (Where n is an exponent  having positive or negative values and N can vary between 1 to 10). e.g. We can write 232.508 as 2.32508 x10 2 in scientific notation. Simi…

The International System of Units (SI)  The International System of Units (in French Le Systeme International d’Unites – abbreviated as SI) was established by the 11th General Conference on Weights and  Measures (CGPM from ConferenceGenerale des…