Coal is made up of the remains of dead plants and animals buried in the ground, exposed to high temperatures and pressure in the absence of air. Exercise Questions 1. What are the advantages of using CNG and LPG as …
The principle, when the light rays fall on a smooth surface, the angle of reflection is equal to the angle of incidence; also, the incident ray, the reflected ray, and the normal to the surface all lie in the same …
CBSE Class 8 Science Chapter 11 Some Natural Phenomena gives you knowledge of natural phenomena like lightning, earthquakes, etc. They shed light on the causes and effects of these natural phenomena. The students need to learn the safety measures to …
Exercise Questions 1. Fill in the blanks. (a) Most liquids that conduct electricity are solutions of ______________ and ______________. (b) The passage of an electric current through a solution causes ______________ effects. (c) If you pass current through copper sulphate …
The human ear can easily detect frequencies between 20 Hz and 20 kHz. Hence, sound waves with frequency ranging from 20 Hz to 20 kHz is known as audible sound. Human ears cannot detect sound frequencies of less than 20 …
The frictional force exerted by fluids is also called drag or fluid friction. To overcome or minimize air fluid friction, the bodies of objects minimise their surface i.e. sometimes spherical shapes or another streamlined shape with smooth surfaces. Aeroplanes, jets, …
In Chapter 7, Force and Pressure, students will come across questions on applied force and changes in the object’s shape. Some questions, like the difference between force and pressure, appear prominently in the exams, which are explained in detail in …
The period which comes between the beginning of adulthood and puberty is called adolescence. In this period, the body undergoes different changes alongside attaining reproductive maturity. It starts somewhat at the age of 11 and ends at the age of …
Reproduction is termed to be a biological process in which organisms give birth to their offspring.It helps in maintaining the continuity of a particular race and in increasing the population of the species.Reproduction is meant for the survival of all …
The number and variety of various life forms, such as plants, animals and microorganisms, in an area are called Biodiversity. Both plants and animals have a mutual dependence on each other for their survival. As they are related to one …
1. List conditions under which combustion can take place. Solution: The burning of a substance in the presence of oxygen is defined as combustion. The conditions under which combustion can take place are 2. Fill in the blanks. (a) Burning …
After studying this chapter’s NCERT Solutions for Class 8 Science, students will be able to gather knowledge on microorganisms, their habitats, classes of microorganisms like bacteria, fungi, protozoans and viruses, mode of their reproduction, use of microorganisms, harmful microorganisms, pathogens, soil microorganisms, …
NCERT Solutions for Class 8 Science Chapter 1 Crop Production and Management guides you with the answers to the questions given in the textbook. Class 8 is an important phase in the student’s life as they are introduced to many new …