Working With the Text (Page21) Discuss these questions in pairs before you write the answers. Q1.Why did the dog feel the need for a master? (1,2) Ans: The dog was sick and tired of going about alone in search of food. And he did not feel safe. So he decided to have a master. Q2. Who did he first choose as his master? Why did he leave that master? (3) Ans: The dog first chose a wolf as his master. But he found the wolf afraid of the bear. So he left the company of the wolf. Q3.Who did he…
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Working With the Text (Page 11) Answer the following questions Q1.What did Patrick think his cat was playing with? What was it really? (2) Ans: Patrick thought that his cat was playing with a little doll. It was, in fact, a very small-sized man, an elf. Q2.Why did the little man grant Patrick a wish? (2) Ans: Patrick had saved the tiny man’s life from the cat by not handing him back to the cat. So he promised to fulfil one wish of Patrick. Q3. What was Patrick’s wish? (3) Ans: Patrick hated doing homework. His greatest wish was that…
Question : Solutions of Questions on Page Number : 204 Q1 : What do we get from cereals, pulses, fruits and vegetables? Answer : (i) Cereals provide us with carbohydrates. Also, they are a rich source of energy. (ii) Pulses give us proteins. (iii) Fruits and vegetables are a rich source of vitamins and minerals. A small amount of proteins, carbohydrates, and fats are also present in them. Q2 : How do biotic and abiotic factors affect crop production? Answer : A variety of biotic factors such as pests, nematodes, diseases, etc. can reduce the net crop production. A pest…
Question : Solutions of Questions on Page Number : 193 Q1 : How is our atmosphere different from the atmospheres on Venus and Mars? Answer : Earth’s atmosphere is different from those of Venus and Mars. This difference lies essentially in their compositions. Earth’s atmosphere is a mixture of nitrogen (79%), oxygen (20%), and a small fraction of carbon dioxide, water vapours and other gases. This makes the existence of life possible on Earth. However, the atmospheres on Venus and Mars mainly consist of carbon dioxide. The amount of carbon dioxide on these planets can range from 95% to 97%.…
Question : Solutions of Questions on Page Number : 178 Q1 : State any two conditions essential for good health. Answer : The twoconditions essential for good health are: (i) An individual must have better health facilities and more professionals to deal with health problems. (ii) All basic necessary conditions to prevent diseases must be present. For example, proper garbage collection and disposal, clearing of drains, supply of healthy drinking water, etc. Q2 : State any two conditions essential for being free of disease. Answer : The twoconditions essential for being free of diseases are: (i) Personal hygiene and cleanliness…
Question : Solutions of Questions on Page Number : 162 Q1 : How does the sound produced by a vibrating object in a medium reach your ear? Answer : When an object vibrates, it forces the neighbouring particles of the medium to vibrate. These vibrating particles then force the particles adjacent to them to vibrate. In this way, vibrations produced by an object are transferred from one particle to another till it reaches the ear. Q2 : Explain how sound is produced by your school bell. Answer : When the school bell vibrates, it forces the adjacent particles in air…
Question : Solutions of Questions on Page Number : 148 Q1 : A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (Fig. 11.3). Let us take it that the force acts on the object through the displacement. What is the work done in this case? Answer : When a force Facts on an object to displace it through a distance Sin its direction, then the work done Won the body by the force is given by: Work done = Force ×Displacement W= F × S Where, F= 7…
Question : Solutions of Questions on Page Number : 134 Q1 : State the universal law of gravitation Answer : The universal law of gravitation states that every object in the universe attracts every other object with a force called the gravitational force. The force acting between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Fortwo objects of masses m1and m2 and the distance between them r, the force (F) of attraction acting between them is given by the universal law of gravitation as: Where, G…
Question : Solutions of Questions on Page Number : 118 Q1 : Which of the following has more inertia: (a) a rubber ball and a stone of the same size? (b) a bicycle and a train? (c) a five-rupees coin and a one-rupee coin? Answer : Inertia is the measure of the mass of the body. The greater is the mass of the body; the greater is its inertia and vice-versa. (a) Mass of a stone is more than the mass of a rubber ball for the same size. Hence, inertia of the stone is greater than that of a…
Question : Solutions of Questions on Page Number : 100 Q1 : A farmer moves along the boundary of a square field of side 10 m in 40s. What will be the magnitude of displacement of the farmer at the end of 2 minutes 20 seconds? Answer : The farmer takes 40 s to cover 4 x 10 = 40 m. In 2 min and 20 s (140 s), he will cover a distance Therefore, the farmer completes rounds (3 complete rounds and a half round) of the field in 2 min and 20 s. That means, after 2 min…