Tag Archives: NCERT Books Online Solutions

Question: While looking up at the sky, how can you distinguish between a planet and a star? Answer: While looking up at the sky, we can distinguish between a planet and a star by observing their twinkling nature. Stars twinkle at night sky whereas planets do not. Question: What is the …

Question: What do you mean by refraction of light? In which direction will light bend when travelling from an optically rarer medium to an optically denser medium? Answer: The bending of light as it passes from one transparent medium to another is called refraction. It occurs because light travels at lower …

We know that a mathematical expression uses mathematical symbols instead of words. For example, the words ‘twenty-eight increased by five’, will be shown as the mathematical expression 28 + 5. Can you give the mathematical expressions for these words? Seventy three minus forty -two Twelve less two Six times fifteen …

Question: What is electric current? Answer: The flow of electrons constitutes an electric current. Question: How is electronic current different from conventional current? Answer: The flow of electronic current is from negative to positive whereas the flow of conventional current is from positive to negative. Question: Differentiate between conductors and insulators. Answer: Difference is as …

This stamp has been stuck on centimeter-squared paper. Take each square to have a side of 1 cm.  USING FORMULA

A polygon is a simple figure formed by connecting line segments. These line segments do not cross each other. Triangles and quadrilaterals (rectangles, squares, etc.) are examples of polygons. TRIANGLES The word triangle means three angles. The given triangle has three angles ∠A, ∠B and ∠C. Points A, B and C are the …

CHECK IN   A protractor is used to measure angles. This angle is measured on the inner scale as the baseline arm point  to 0° on the inner scale. The other arm crosses 50° showing that ∠ AOB = 50°. Angles are named according to their measures.

Sometimes when we have a lot of information about things, it helps us to organize the information or data, as also called, Into graphs. Graphs  also help us understand and use the information in a proper manner. Graphs are pictorial or diagrammatic representations of data. PICTOGRAPHS Pictograph use pictures or …

Question: What are the basic ideals of a democracy? Answer: The basic ideals of democracy are… The participation of the citizens in the government’s decision-making. The need for the government to have the consent of its citizens in all major issues taken by it. Question: What is the purpose of …

PROFIT AND LOSS Mr Gupta makes very good rocking chairs. It coast him Rs. 795 to make one rocking chair. He sells it in his furniture shop at Rs. 900. Rs. 795 is the Cost Price (CP) of the chair. Rs. 900 is the Selling Price (SP) of the chair. …