In-Text Questions Solutions In Text-Questions Page 148 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?Ans:- When a force […]
In-Text Questions Solutions In Text-Questions Page 134 State the universal law of gravitation.Ans:- According to universal law of gravitation, every particle in the universe attracts every other particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of distance between them. The direction of force […]
In-Text Questions Solutions In Text-Questions Page 118 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?Ans:- (a) Mass of a stone is more than the mass of a rubber ball of same size. […]
In-Text Questions Solutions In-Text Questions Page 32 In a reaction, 5.3 g of sodium carbonate reacted with 6 g of ethanoic acid. The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium ethanoate. Show that these observations are in agreement with the law of conservation of mass. sodium carbonate […]
In-Text Questions Solutions In Text-Questions Page 100 An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.Ans:- Yes, an object moving through a distance can have zero displacement. This happens when final position of the object coincides with its initial position. For example, if a […]
NCERT In-Text Questions Solutions In-Text Questions Page 15 What is meant by a pure substance?Ans:- A pure substance consists of a single type of particles that cannot be separated into other kinds of matter by any physical process. List the points of differences between homogeneous and heterogeneous mixtures.Ans:- Differences between homogeneous and heterogeneous mixture: S. […]
NCERT In-Text Questions Solutions In-Text Questions Page 80 Why do we classify organisms?Ans:- For easier and convenient study we classify organisms. Give three examples of the range of variations that you see in lifeforms around you.Ans:- (a) Small cat and big cow(b) Grass and banyan tree (c) Black crow and green parrot In-Text Questions Page […]
NCERT In-Text Questions Solutions In-Text Questions Page 69 what is tissue?Ans:- A group of cells that are similar in structure and perform a particular function is called tissue. What is the utility of tissues in multi-cellular organisms?Ans:- Tissues provide structural strength, mechanical strength, show division of labour. In-Text Questions Page 74 Name types of simple […]
NCERT In-Text Questions Solutions In-Text Questions Page 03 Which of the following are matter?Chair, air, love, smell, hate, almonds, thought, cold, cold-drink, smell of perfume.Ans:- Chair, air, almonds, and cold-drink. Give reasons for the following observation:The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you […]
NCERT In-Text Questions Solutions In-Text Questions Page 59 Who discovered cells, and how?Ans:- Robert Hooke discovered cells in 1665 while examining a thin slice of cork through a self-designed microscope. He saw that the cork resembled the structure of a honey comb consisting of many little compartments. He called these small boxes cells. Why is […]