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. … Read more
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 … Read more
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 … Read more
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. … Read more
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 … Read more
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 … Read more
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 … Read more
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 … Read more
Question : Solutions of Questions on Page Number : 80 Q1 : Why do we classify organisms? Answer : There are a wide range of life forms (about 10 million -13 million species) around us. These life forms have existed and evolved on the Earth over millions of years ago. The huge range of these … Read more
Question : Solutions of Questions on Page Number : 69 Q1 : What is a tissue? Answer : Tissue is a group of cells that are similar in structure and are organised together to perform a specific task. Q2 : What is the utility of tissues in multi-cellular organisms? Answer : In unicellular organisms, a … Read more