Science

NCERT 8th Class (CBSE) Science: Light – Quiz 26 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: Light – Quiz: When a beam of light falls on a smooth surface it gets reflected in one direction. This is called regular reflection. When a beam of light falls on …

Question: What is reflection of light? Answer: The objects send back the light which falls on them. This sending back of light by objects is called reflection of light. Question:What is the second law of reflection? Answer: The second law of reflection states that the incident ray, the normal and the …

NCERT 8th Class (CBSE) Science: Some Natural Phenomena – Quiz 28 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: Some Natural Phenomena – Quiz: Static electricity consists of electrical charges that do not flow. There are two kinds of charges – positive and negative. When two bodies are rubbed together, …

Question: Why does a comb rubbed on hair attract pieces of paper? Answer: The comb on rubbing became gets electrically charged and attract pieces of paper. This is called electrostatic force. Question: Under what conditions do charges attract or repel each other? Answer: Like charges repel and unlike charges attract each other. …

Question: How is sound produced? Answer: Sound is produced by rapid to-and-fro movements called vibrations. Question: Distinguish between infrasonic and ultrasonic. Answer: Difference is as follows: Question: What do you mean by time period of a vibrating object? Answer: The time taken for one complete vibration or oscillation is called its time period. Question:What is …

NCERT 8th Class (CBSE) Science: Sound – Quiz 26 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: Sound – Quiz: Sound is produced by rapid to and fro movements, called vibrations. The maximum distance to which an oscillating or vibrating object moves from its central position is called amplitude. …

NCERT 8th Class (CBSE) Science: Conservation of Plants and Animals – Quiz 22 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: Conservation of Plants and Animals – Quiz: Ecosystem consists of all the plants, animals and microorganisms in an area, along with all the non-living components, such as climate, …

Question: What is biodiversity? Answer: Biodiversity is the variety of plants, animals and microorganisms generally found in an area. Question: What do you mean by flora and fauna? Answer: Flora: Species of all plants found in a particular area is known as flora of that area. Fauna: Species of all animals found in …

NCERT 8th Class (CBSE) Science: Combustion and Flame – Quiz 32 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: Combustion and Flame – Quiz: Combustion is the process in which a substance burns in air or oxygen to produce heat and light. When a hydrocarbon fuel is burnt in …

Question: What is combustion? Answer: The process of burning of substances in air or oxygen with the evolution of heat and light is known as combustion. Question: Distinguish between combustible and non-combustible substances, giving three examples of each. Answer:  Question: Why is it more difficult to burn some combustible substances than others? Answer: Different substances …