NCERT Solutions for Class 8 Science Chapter 5 – Coal and Petroleum provide a comprehensive guide for students studying under the Central Board of Secondary Education (CBSE) curriculum. This chapter explores the formation, composition, and uses of coal and petroleum, which are two of the most important sources of energy in the world today. NCERT Solutions for Class 8 Science Chapter 5 have been developed by the National Council of Educational Research and Training (NCERT) to help students understand and master the concepts covered in this chapter. NCERT Solution Class 8 Science Chapter 5 – Coal and Petroleum Exercise :…
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Exercise : Solutions of Questions on Page Number : 53 Q1 :Which of the following can be beaten into thin sheets? (a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen Answer : (a) Zinc Q2 :Which of the following statements is correct? (a) All metals are ductile. (b) All non-metals are ductile. (c) Generally, metals are ductile. (d) Some non-metals are ductile. Answer : (c) Generally, metals are ductile However, mercury metal- a liquid at room temperature – cannot be drawn into wires and is not ductile. Q3 :Fill in the blanks: (a) Phosphorus is a very _________non-metal. (b) Metals are…
Synthetic Fibres and Plastics Class 8 Questions Science Chapter 3 Exercise : Solutions of Questions on Page Number: 41 Q1 :Explain why some fibres are called synthetic. Answer : There are some fibres that are prepared by man by using chemicals. These are called synthetic fibres. These are made of small units that join together to form long chains. Examples of synthetic fibres are rayon, nylon, polyester, acrylic, etc. Q2 :Mark () the correct answer. Rayon is different from synthetic fibres because (a) it has a silk-like appearance. (b) it is obtained from wood pulp. (c) its fibres can also…
Exercise : Solutions of Questions on Page Number : 29 Q1 :Fill in the blanks: (a) Microorganisms can be seen with the help of a _________. (b) Blue green algae fix _________ directly from air to enhance fertility of soil. (c) Alcohol is produced with the help of _________. (d) Cholera is caused by _________. Answer : (a) Microorganisms can be seen with the help of a _microscope _. (b) Blue green algae fix __ nitrogen_ directly from air to enhance fertility of soil. (c) Alcohol is produced with the help of _yeast _. (d) Cholera is caused by _…
Exercise : Solutions of Questions on Page Number : 13 Q1 : Select the correct word from the following list and fill in the blanks. float, water, crop, nutrients, preparation (a) The same kind of plants grown and cultivated on a large scale at a place is called _________. (b) The first step before growing crops is ________ of the soil. (c) Damaged seeds would _________ on top of water. (d) For growing a crop, sufficient sunlight and _________ and _________ from the soil are essential. Answer : (a) The same kind of plants grown and cultivated on a large scale…
Exercise : Solutions of Questions on Page Number : 228 Q1 : Fill in the blanks: (a) Cleaning of water is a process of removing _______. (b) Wastewater released by houses is called ________. (c) Dried _______ is used as manure. (d) Drains get blocked by ________and ________. Answer : a) Cleaning of water is a process of removing __pollutants__. (b) Wastewater released by houses is called __sewage__. (c) Dried __sludge__is used as manure. (d) Drains get blocked by __cooking oil__and __fats__. Q2 : What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.…
Exercise : Solutions of Questions on Page Number : 217 Q1 : Explain how animals dwelling in the forest help it grow and regenerate. Answer : The animals in forests are of various types. These could be herbivores, carnivores, micro-organisms, etc. These play an important role in maintaining the food chains. (i) Micro-organisms convert the dead plants and animals to humus. This humus helps in returning the nutrients back to the soil. These are absorbed by plants. (ii) The animals also help in dispersing the seeds of certain plants. (iii) The decaying animal dung provides nutrients to various types of…
NCERT Solutions for Class 7 Science Chapter 16 Water: A Precious Resource Exercise : Solutions of Questions on Page Number : 203 Q1 : Mark ‘T’ if the statement is true and ‘F’ if it is false: (a) The freshwater stored in the ground is much more than that present in the rivers and lakes of the world. (T/F) (b) Water shortage is a problem faced only by people living in rural areas. (T/F) (c) Water from rivers is the only source for irrigation in the fields. (T/F) (d) Rain is the ultimate source of water. (T/F) Answer :…
Exercise : Solutions of Questions on Page Number : 189 Q1 : Fill in the blanks: (a) An image that cannot be obtained on a screen is called ________. (b) Image formed by a convex ________is always virtual and smaller in size. (c) An image formed by a ________mirror is always of the same size as that of the object. (d) An image which can be obtained on a screen is called a _______image. (e) An image formed by a concave ________cannot be obtained on a screen. Answer : a) An image that cannot be obtained on a screen is…
Exercise : Solutions of Questions on Page Number : 170 Q1 : Draw in your notebook the symbols to represent the following components of electrical circuits: connecting wires, switch in the ‘OFF’ position, bulb, cell, switch in the ‘ON’ position, and battery. Answer : Component of electrical circuit Symbol Connecting wires Switch in the ‘OFF’ position Bulb Cell Switch in the ‘ON’ position Battery Q2 : Draw the circuit diagram to represent the circuit shown infigure. Answer : In the given circuit, one terminal of the bulb is connected with one terminal of the cell while their other terminals are…