91.यदि हो, तो k का मान है : A) 1/2 B) 2 C) 1 D) 3/2 Sol:B Put a=b=c=1, k=2 Or सभी समीकरण को जोड़ने पर, 2(a+b+c)=(a+b+c)k k=2 92. निम्नलिखित n से कोई तीन मापों को लेकर कुल कितने त्रिभुज बनाये जा सकते हैं ? भुजा की माप 1.2 cm, 1.4 cm 5.9 cm और…
Read MoreImportance of variation The consistency of DNA copying during reproduction is important, which leads to the stability of population species. Changes in an ecological system, is beyond our control like varying temperature, varying water level and natural calamities, can wipe out the population species. So, if there are some variations that are present in some…
Read MoreCHEMICAL REACTIONS AND EQUATIONS Chemical reaction: The transformation of chemical substance into another chemical substance is known as Chemical reaction. For example: rusting of iron, burning of coal, burning of candle digestion of food etc. In chemical reaction the new substance is formed which is completely different in properties from the original substance. Experiment…
Read MoreTENSE INTRODUCTION Tense is a category that expresses time reference. The tenses simply show the time of an action or state of being as shown by a verb. The verb ending is changed (conjugated) to show what time it is referring to. WHAT IS TENSE? Tenses are form of verb-based method used to indicate the time, and sometimes the…
Read MoreARTICLES INTRODUCTION An article is a word that modifies or describes the noun. It is used before the noun to show whether it refers to something specific or not. So, articles can also be described as demonstrative adjectives. WHAT ARE ARTICLES? An article is a word or a letter which is used before noun…
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