Free Chemistry in Daily Life MCQs with Answers

111. Percentage of water in an apple is__________?

• A. 84%
• B. 90%
• C. 66%
• D. None of these

Explanation: An apple is composed of roughly 84 to 86% water, so 84% is the closest listed value. The exact percentage varies with the variety and ripeness.

112. Percentage of water in a tomato is__________?

• A. 94%
• B. 90%
• C. 47%
• D. None of these

Explanation: Tomatoes contain approximately 94% water, which is higher than the water content commonly quoted for apples. Therefore the closest option is 94%.

113. Which metal is non toxic in nature?

• A. Silver
• B. Iron
• C. Copper
• D. Gold

Explanation: Gold is highly unreactive and is generally considered non-toxic in its metallic form. Silver, copper and iron are useful metals but can cause harmful effects at excessive doses or in certain compounds.

114. Frederick Sanger is a twice recipient of the Nobel Prize for ________?

• A. Physics in 1956 and 1972
• B. Chemistry in 1958 and 1980
• C. Physics in 1903 and Chemistry in 1911
• D. Chemistry in 1954 and Peace in 1962

Explanation: Frederick Sanger received the Chemistry Nobel Prize in 1958 for determining the structure of insulin and again in 1980 for work on nucleic-acid sequencing. He is one of the very few double Nobel laureates.

115. Which one of the following is not a plant product?

• A. Caffeine
• B. Nicotine
• C. Piperine
• D. Saccharin

Explanation: Saccharin is an artificially synthesized sweetener, whereas caffeine, nicotine and piperine are naturally occurring plant alkaloids. Their plant origins do not mean they are harmless, but they are plant products.

116. What is the number of known crystalline phases of water ________?

• A. 4
• B. 8
• C. 17
• D. 18Physics

Explanation: Water forms different crystal structures when temperature and pressure change; the standard classification used in such MCQs recognizes 18 crystalline phases. These include familiar ice and several high-pressure forms.

117. The Microbes used in baking industry is ________?

• A. Penicillin
• B. Yeast
• C. Water
• D. None of these

Explanation: Yeast is a microorganism that ferments sugars and releases carbon dioxide, causing bread dough to rise. Penicillin is an antibiotic, not the microbe used in ordinary baking.

118. Boiling point of pure water is __________?

• A. 90'C
• B. 97'C
• C. 100'C
• D. None of these

Explanation: At standard atmospheric pressure, pure water boils at 100°C. The boiling point changes with pressure, which is why water boils at a lower temperature at high altitudes.

119. Matter exists in______ states.

• A. One
• B. Three
• C. Five
• D. None of these

Explanation: Matter is commonly classified into three states: solid, liquid and gas. Modern science also recognises states such as plasma, but the basic school-level answer is three.

120. The process involved in making soap is called?

• A. saponification
• B. hydrolysis
• C. condensation
• D. polymerisation

Explanation: Saponification is the alkaline hydrolysis of fats or oils, producing soap and glycerol. Hydrolysis describes the chemical reaction generally, but saponification is its specific soap-making name.