The Central Board of Secondary Education (CBSE) is one of the oldest and most famous educational boards. Due to its comprehensive syllabus and well-designed exam pattern, CBSE is one of the most preferred educational boards in the country. The Central Board of Secondary Education provides the best education to its learners so that they can prosper in their academics.
Science is one of the most interesting and scoring subjects in CBSE class 8. Many students fail to score good marks in science as they fail to understand the concepts of the subject properly. The important questions for class 8 science are given here so that students can understand each and every concept of science more effectively. Students are advised to practice the below-given important questions for class 8 science on a regular basis to score well in their class 8 exam.
The 5 marks questions are given here so that students can score good marks in this section. The questions are created by subject teachers according to the current CBSE class 8 syllabus.
The important 5 marks questions for class 8 science are given below.
Question 1- Draw a neat diagram of a flame and label the parts.
Question 2- Write the important steps involved in agricultural practices.
Question 3- (a) If microorganisms were not there, the earth would have been full of garbage and unwanted materials. Why?
(b) Write any two ways in which microorganisms are beneficial to us.
(c) Write any two ways in which microorganisms are harmful to us.
Question 4- (a) What happens when the zinc strip is dipped into blue copper sulphate solution? Why?
(b) What would happen to iron railings on the roadside if they were not painted? Why does it so happen?
(c) Why should foodstuffs like chutneys, pickles and curd not be stored in containers made of metals?
Question 5- (i) How is the sex of the foetus determined? Why is it prohibited by law?
Question 6- Write any five factors which should be considered while choosing a fuel.
Question 7- What are secondary sexual characters? Mention the male and female secondary sexual characters in human beings.
Question 8- (a) State the laws of reflection.
(b) Mention any three vision-related problems and their possible causes.
Question 9- What is electrolysis? Explain the process and its possible causes.
Question 10- (a) Describe Eutrophication.
(b) What is acid rain? Mention any two effects of it.
Question 11- Describe the asexual method of reproduction in amoeba with a suitable diagram.
Question 12- Give reasons for the following:
(a) Aluminium foils are used to wrap food items.
(b) Immersion rods for heating liquids are made up of metallic substances.
(c) Copper cannot displace zinc from its salt solution.
(d) Sodium and potassium are stored in Kerosene.
Question 13- Define the following terms-
(i) Reproduction
(ii) Fertilization
(iii) Metamorphosis
(iv) Foetus
(v) Binary Fission
Question 14- What is fractional distillation? And list different constituents of petroleum.
Question 15- i) What is earthing?
ii) Explain how lightning conductors protect tall structures from damage due to lightning?
iii) Suggest any two measures to protect ourselves from lightning.
Question 16- (i) List any two sources of noise pollution in your surroundings.
ii) Explain in what way noise pollution is harmful to humans.
iii) Write any two measures to limit noise pollution.
Question 17- (i) List any four changes in the body that take place at puberty.
ii) What is a balanced diet? Why is it more necessary for adolescents?
iii)Why are chips, colas and junk food not good for health?
Question 18- (i) Draw a labelled sketch of the human eye.
(ii) ’Vision’ is one of the wonderful gifts given to us by god. But most people never take care of their eyes. Care for eyes should be taken. Suggest two methods of proper eye care.
(ii) ’Vision’ is one of the wonderful gifts given to us by god. But most people never take care of their eyes. Care for eyes should be taken. Suggest two methods of proper eye care.
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