STUDY EDUCATION - MP Board Solutions

NCERT Class 8 Science Chapter 18 Pollution of Air and Water Solutions NCERT TEXT BOOK EXERCISES Q. 1. What are the different ways in which water gets contaminated? Ans. Water gets contaminated by following ways:   (i) Water gets contaminated when sewage is disposed off in rivers. (ii) Chemicals which are harmful and poisonous are thrown in water resources by various industrial units. (iii) Harmful chemicals used in agricultural process gets mixed with ground water making it unfit for consumption. (iv) Breeding of microorganisms in water make water polluted. Q. 2. At an individual level, how can you help reduce air pollution? Ans. We can plant tree to reduce the level of carbon dioxide. We can get our vehicles serviced well to reduce incomplete consumption of fuels. We can also reduce air pollution by saying no to crackers during Diwali celebrations. Q. 3. Clear, transparent water is always fit for drinking. Comment. Ans. The clear, transparent water may not always safe for drinking...

NCERT Class 8 Science Chapter 17 Stars and the Solar System Solutions NCERT TEXT BOOK EXERCISES Choose the correct answer in Questions 1-3 Q. 1. Which of the following is NOT a member of the solar system? (a) An asteroid. (b) A satellite. (c) A constellation. (d) A comete. Ans. (c) A constellation. Q. 2. Which of the following is NOT a planet of the sun? (a) Sirius. (b) Mercury. (c) Saturn. (d) Earth. Ans. (a) Sirius. Q. 3. Phases of the moon occur because: (a) we can see only that part of the moon which reflects light towards us. (b) our distance from the moon keeps changing. (c) the shadow of the Earth covers only a part of the moon’s surface. (d) the thickness of the moon’s atmosphere is not constant.  Ans. (c) the shadow of the Earth covers only a part of the moon’s surface.  Q. 4. Fill in the blanks: (a) The planet which is farthest from the Sun is _________. Ans. Neptune. (b) The planet which appears reddish in colour is _________. Ans. Mars. (c) A group of stars that ap...

NCERT Class 8 Science Chapter 16 Light Solutions NCERT TEXT BOOK EXERCISES Q. 1. Suppose you are in a dark room. Can you see objects outside the room? Explain. Ans. When we are in a dark room then we do not see objects. We can see the objects outside the room because out of the room the light is available and that rays of light enter in our eyes after reflection. Q. 2. Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection? Ans. Regular Reflection Diffused Reflection 1. It takes place on a smooth surface. 1. It takes place on a rough surface. 2. It has all the reflected rays in parallel. 2. Reflected rays are not parallel. 3. Reflected rays are in one direction. 3. Reflected rays are scattered in different directions. Diffused reflection is not due to failure of laws of reflection. Diffused reflection is not due to the failure of the laws of reflection. It is caused by the irregularities in the reflecting surfaces. Q. ...