Short answer type questions Question 1. What do understand by chemical changes? Question 2. What do you understand by physical changes? Question 3. Give some examples of physical changes. Question 4. Give some examples of chemical changes. Question 5. What do mean by ozone layer? What does it do? Question 6. What do understand …
Short answer type questions Question 1. Make a table of substance showing which substances taste sour, bitter and sweet. Question 2. Which substances contain acids? Question 3. Which substances are basic in nature? Question 4. Difference between acids and bases. Question 5. What are indicators? Question 6. How litmus solution is obtained. Name two …
Short answer type question Question 1. Wool is obtained from which part of sheep? Question 2. What do you mean by sheep rearing? Question 3. What is shearing? Question 4. Name some animals that yield wool. Question 5. Explain the term ‘selective breeding. Question 6. What is sericulture? Question 7. What do you understand …
Question 1. Fill in the missing word in the blank spaces in the following statements: (a) Wind is——————air. (b) Winds are generated due to——————heating on the earth. (c) Near the earth’s surface __________air rises up whereas ___________ air comes down. (d) Air moves from a region of ——— pressure to a region of——— pressure. Solution …
Question 1. Classify the changes involved in the following processes as physical or chemical changes: (a) Photosynthesis (b) Dissolving sugar in water (c) Burning of coal (d) Melting of wax (e) Beating aluminium to make aluminium foil (f) Digestion of food Solution 1. chemical change Physical change Photosynthesis Dissolving sugar in water Burning …
Introduction We notice many changes taking place around us on their own. For instance, flowers bloom and wither with time, and crop changes from time to time. Changes take place in our body also like an increase in height and weight etc. When one or more properties of a substance become different or something new …
Introduction As we know that curd, lemon juice, orange juice and vinegar taste sour. These substances taste sour because they contain acids. These substances are acidic in nature. The word acid comes from the Latin word acere which means sour. Substances which are bitter in taste and soapy to touch are called bases. These substances …
