Class 08

Class 08 NCERT Solutions

Science Chapter-13: Sound

Select the correct answer from the following:

Que.1.The propagation of sound takes place through

(i) solids only (ii) liquids only (iii) gases only (iv) solids, liquids and gases.

Read more ...

Science Chapter-15: Some Natural Phenomena

Q.1. Identify the one which does not charge by friction that easily?

(i) An inflamed balloon

(ii) A woolen cloth

(iii) A plastic scale

(iv) A copper rod

Read more ...

Science Chapter-02: Microorganisms: Friend And Foe

Q.1. Fill in the blanks:

(i) ___________ is used to see microorganisms.

(ii) ___________ causes cholera.

(iii)___________ is used to produce alcohol.

(iv)___________ is fixed directly from air to enhance the soil fertility by blue green algae.

Read more ...

Science Chapter-06: Combustion and Flame

1. What are the conditions under which a combustion can take place?

Read more ...

Science Chapter-04: Materials : Metals and Non-Metals


Which of the following can be beaten into thin sheets?

(i) Phosphorus (ii) oxygen (iii) zinc (iv) sulphur

Read more ...

Science Chapter-08: Cell: Structure and Functions

  1. Indicate whether the following statements are True or False.

a) Unicellular organisms have a one-celled body.

b) Muscle cells are branched.

c) The basic living unit of an organism is an organ.

d) Amoeba has irregular shape.

Read more ...

Science Chapter-03: Synthetic Fibres and Plastics


Explain the reason why some of the fibres are called synthetic.

Read more ...

Science Chapter-05: Coal and Petroleum

Question 1:

Compressed Natural Gas (CNG) and Liquefied Petroleum Gas (LPG) are used as fuels. What are its advantages?

Read more ...

Science Chapter-01: Crop Production and Management


(a) The cultivation of a single variety of plants at a place on a big scale in terms of area are known as ________________.

(b) The seeds that are damaged will _________on upper portion of the water.

(c) Sufficient ______,________ and ____________in the soil is required for the growth of a crop.

(d) __________________of the soil is the first step before growing crops.

Read more ...

Science Chapter-14: Chemical Effects of Electric Current

1. Complete the following sentence.

(a) _______, _______ and _______ are the liquids that conduct electricity.

(b) _______ is the effect generated when an electric current is passed through a solution.

(c)_______ is known as the process for depositing a layer of any metal on another material by the means of Electricity.

Read more ...

Science Chapter-09: Reproduction in Animals

1) What is the importance of reproduction in organisms?


  • Reproduction is termed to be a biological process in which organisms give birth to their off springs.
  • It helps in maintaining the continuity of particular race and helps in increasing the population of the species.
  • Reproduction is meant for survival of all living things.

Read more ...

Science Chapter-07: Conservation of Plants and Animals

1. Fill in the blanks:

(a) _______ is a place where animals are protected in their own natural habitat.

(b) Species found only in a particular area are known as _______.

(c) Migratory birds fly to faraway places because of _______ changes.

Read more ...

Science Chapter-10: Reaching the Age of Adolescence


Which chemical substance is secreted by the endocrine glands which are responsible for the changes taking place in the body?

Read more ...

Science Chapter-12: Friction


Fill in the blanks with the appropriate words.

a) It is the________of the surface on which the friction depends.

b) Sliding friction is_______compared to the static friction.

c) _________is produced by the friction.

Read more ...

Science Chapter-18: Pollution of Air and Water


State the different ways in which water is contaminated.

Read more ...

Science Chapter-11: Force and Pressure


In which situations, do you need to pull or push to change the state of motion of an object? Give two examples.

Read more ...

Science Chapter-17: Stars and the Solar System

Question 1:

From the following pick out, which is not the member of the solar system?

a) A satellite

b) A comet

c) An asteroid

d) A constellation

Read more ...

Science Chapter-16: Light


Imagine a person is in a dark room, will he be able to see any object which is kept inside the room and any other object which is kept out of the room? Elaborate.

Read more ...

Maths Chapter-02: Linear Equations in One Variable

Exercise 1


Solve the linear equation \(\frac{x}{2}-\frac{1}{5}=\frac{x}{3}+\frac{1}{4}\)

Read more ...

Maths Chapter-01: Rational Numbers

  1. Using appropriate properties find the value of \(\frac{-2}{3}\times \frac{3}{5}+\frac{5}{2}-\frac{3}{5}\times \frac{1}{6}\)

Read more ...

Maths Chapter-09: Algebraic Expressions and Identities

Q.1. Identify the terms and their coefficients for each of the following expressions.

(I) 5abc2 – 3cb

Read more ...

Maths Chapter-08: Comparing Quantities

Q1. Calculate the ratio for the following:

(i) The scooter runs with a speed of 30 km/hour and the cycle runs with a speed of 60 km/ hour.

Read more ...

Maths Chapter-06: Squares and Square Roots

Question-1) Determine which digit will be at the unit’s place in the squares of the numbers given below:

  1. 36
  2. 273
  3. 798
  4. 3864
  5. 58637
  6. 63545
  7. 16542
  8. 45640
  9. 98231
  10. 89999

Read more ...

Maths Chapter-16: Playing with Numbers

Exercise 16.1

  1. In the given addition, find the value of the letters and give reason.

Read more ...

Maths Chapter-14: Factorisation


Question1. Calculate the common factors of the following:

( i )16a and 28 ( i i )26x and 13ya

( iii )20pq, 30rp and 20pqr ( iv )12a3y2 and 5a2y3z2

( v ) 8abc and 18ab2 ( vi )6pqr, 24pq2 and 12p2q

Read more ...

Maths Chapter-03: Understanding Quadrilaterals

Exercise 3.1

Q1) Given below are some shapes.

Identify the below diagrams based on the following category

(a) Concave polygon (b) Simple curve (c)Convex polygon

(d)Simple closed curve (e) Polygon

Read more ...

Maths Chapter-12: Exponents and Powers


Q.1. (i)\( 4^{-3}\)

(ii)\( (-5)^{-5}\)

(iii)\( (\frac{1}{2})^{-4}\)

Read more ...

Maths Chapter-07: Cubes and Cube Roots

Exercise 7.1


Mention the numbers that are not perfect cubes.

Read more ...

Maths Chapter-11: Mensuration

Exercise 11.1

1. A rectangle and a square field with given measurements have same perimeter is given below in the figure. Which of the following has larger area?

Read more ...

Maths Chapter-13: Direct and Inverse Proportions

Exercise 13.1

Q1: Following are the car parking charges near railway station according to the hours:

Read more ...

Maths Chapter-05: Data Handling

Exercise 5.1

1. For which of these would you use a histogram to show the data:

(a) The number of letters for different areas in a postman’s bag.

(b) The height of competitors in an athletics meet.

(c) The number cassettes produced by 5 companies.

Read more ...

Maths Chapter-10: Visualising Solid Shapes

Exercise 10.1

Question 1:

Given below are solids, and their compared views. Match them by comparing them with their top views and front views. For the example default: The first is done for you:

Read more ...

Maths Chapter-04: Practical Geometry

Exercise 4.1

Question 1:

Construct the following quadrilaterals.

Read more ...

Maths Chapter-15: Introduction to Graphs

Exercise 15.1

Q1) The graph given below shows the temperature of a patient observed every hour.

(a) What was the temperature of the patient at 2 pm?

(b) When was the temperature of the patient \(36.5^{\circ}\)?

Read more ...