Recent questions tagged science

Match column I with column 11 and select the correct option from the codes given below. Column - I Column - II (a) Clothing material (i) Nylon (b) Twisted fibre (ii) Fabric (c) Synthetic fibre (iii)Yarn (d) Animal fibre (iv) Cotton (e) Plant fibre (v) Silk

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Reema's mother has done some preparations for her Birthday Party. Which of the folllowing changes can be reversed

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Lactic acid is found in

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In an atomic explosion, enormous energy is released which is due to

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Water is neither acidic nor alkaline because

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Compared to ionic compounds, covalent bonds have

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What is laughing gas?

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Two main requirements to make ammonia are

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Hypothesis that matter has a continuous composition which can always be broken down into smaller and smaller pieces was given by

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Which of the following are the ingredients of gun metal?

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Which of the following are true regarding a catalyst? 1. It is a substance which increases the rate of reaction. 2. It is a substance which reduces the activation energy. 3. It is a substance which increases the activation energy. 4. It is a substance which is consumed in the reaction.

asked Aug 14, 2017 by meena.p

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If baking soda or fruit salt is mixed with vinegar there takes place a

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Fog would most likely occur when

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Sodium becomes a cation because

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Stars are made up of two most abundant elements in universe namely

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Permanent hardness of water may be removed by the addition of

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The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

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The average salinity of sea water is

asked Aug 11, 2017 by meena.p

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In an atomic explosion, enormous energy is released which is due to

asked Aug 11, 2017 by meena.p

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Which of the following is a protein?

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The solution which do not change the colour of either red/blue litmus are known as

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If 1g of hydrogen is mixed with 8 g of oxygen they water produced will be

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A gas which is used as cooling agent is

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Non stick cooking utensils are coated with

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The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of

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When an iron nail gets rusted, iron oxide is formed

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What do the letters pH stand for?

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Petroleum, gasoline, kerosene, diesel, paraffin wax are yielded on fractional distillation of

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Name the chemical used to test the presence of $CO_2$ in exhaled air.

asked Aug 11, 2017 by meena.p

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Washing soda is the common name for

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In the manufacture of safety matches, which of the following materials are used to coat the two sides of match boxes? 1. Yellow phosphorus 2. Glue 3. Glass powder 4. Red phosphorus

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A solute disappears when it is added to a

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Medicinal drugs are bitter in taste hence they are added with

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A chemical change could best be demonstrated by

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Water is neither acidic nor alkaline because

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To desalinate water technique used is

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Which of the following is a non metal that remains liquid at room temperature?

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The hardest substance available on earth is

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The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

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Which is the first thing that would happen if a plant could NOT obtain carbon dioxide?

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Low densities, low melting and boiling point and poor conductivity is found in

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In a comparison with a gold atom and hydrogen atom, gold atom is

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Which of the following causes the rusting of iron? a)Oxidation b)Reduction c)Chemical reaction with oxygen d)Chemical reaction with CO

asked Aug 11, 2017 by meena.p

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What are the most common elements in the human body?

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Which of the following is not produced if you mix vinegar (an acid) and sodium bicarbonate (an alkali, or base) together?

asked Aug 11, 2017 by meena.p

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Which of the following has the highest pH value?

asked Aug 10, 2017 by meena.p

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Which of the following is the newest element to be discovered and synthesised?

asked Aug 10, 2017 by meena.p

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Chemical change does not take place in case of?

asked Aug 10, 2017 by meena.p

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Which of the following statements is/are true? A. The process of oxidation leads to a gain of electrons. B. The process of oxidation leads to a Toss of electrons. C. The process of reduction leads to a gain of electrons. D. The process of reduction leads to a loss of electron

asked Aug 10, 2017 by meena.p

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What is the percentage of $CO_2$ in the exhaled air?

asked Aug 10, 2017 by meena.p

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