CBSE Class 8 Science Sample Paper Set 19

CBSE Class 8 Science Sample Paper Set S.Sample Papers are the very important for every student. The sample papers should be practiced to gain extra marks in examinations. The sample papers have been prepared based on summative assessment1 and summative assessment 2 pattern. The sample papers have been prepared based on pattern of last year examinations and as per latest changes in the syllabus. Students, teachers and parents can download all CBSE educational material and very well prepared worksheets from this website.  All CBSE educational material is developed by our panel of teachers, have also been submitted by CBSE teachers and students. 

Q.1 Choose the correct option in each of the following. 

i) Sperms collect and mature in the –

a) epididymis b) vas deferens

c) scrotal sac d) testes

ii) Which one of the following is a natural fibre?

a) polyester b) nylon

c) cellulose d) acrylic

iii) The electrode, connected to the negative terminal of a battery is -

a) anode b) cathode c) electrolyte d) can’t say

iv) When the angle between the two mirrors is 900, the number of images formed will be -

a) 3 b) 2 c) 1 d) 5

v) Natural gas is used to produce -

a) coke b) carbon black c) biodiesel d) coal tar

vi) Which one of the following effects the ozone layer?

a) carbon dioxide b) soot c) CFCs d) dust

Q.2 Complete the following sentences. 

i) ________ is the stage of attaining sexual maturity in males and females.

ii) ________ fibres compete with wool.

iii) The main constituent of coal is ________.

iv) The kaleidoscope is a device that uses ________ to produce patterns.

v) The process by which the carbon content of coal increases is called ________ .

vi) Protecting wildlife in its natural surrounding is called ________ conservation.

Q.3 Answer the following in one word. 

i) The process of formation of a polymer from its monomer ________.

ii) The gas collected over petroleum in a petroleum well ________.

iii) The most polluted river of the country ________.

iv) The phenomenon of splitting of light into its component colours on refraction ________.

v) Natural fountains of hot water and stream often used to generate electricity ________.

vi) The plants / animals that do not belong to a place originally and are introduced from elsewhere ________.

Q.4 Give reasons for the following. (any three) (2×3=6)

i) Acrylics are not spun from the melt.

ii) A log of wood takes longer time to start burning than the wood shavings.

iii) Metals are good conductor of heat.

iv) The image formed on a metal surface is hazy as compared to the image formed on a mirror.

Q.5 Define the following terms (any five). (2×5=10)

i) Asexual reproduction ii) Foeticide

iii) Electrolyte iv) Accomodation

v) Biomass energy vi) Endangered species

vii) Ignition temperature

Q.6 Draw and label of the following (any two). (3×2=6)

i) Female reproductive system

ii) Electroplating of spoon with silver

iii) Operations at waterworks / large scale purification of water.

iv) Fractional distillation of petroleum.

Q.7 Answer the following in not more than 20 words. (any six) (2×6=12)

i) Write any two advantages and two disadvantages of synthetic fibres.

ii) What is an ion ? Give two examples of it.

iii) What is lateral inversion?

iv) Name any four alternative sources of energy that can be used for the generation of electricity.

v) What is potable water? Write any two properties of it.

vi) What does ‘sustainable utilization’ of natural resources mean?

vii) What is wildlife? What to you understand by Joint Forest Management?

viii) Why are coal, petroleum and natural gas called fossil fuel?

Q.8 Answer the following in not more than 40 words. (any six) (3×6=18)

i) How are twins born?

ii) What is biogas and how does it burn?

iii) What happens when voltage is applied across electrodes placed in an electrolyte?

iv) What do you understand by the blind spot of the eye?

v) Describe any three methods of preventing water pollution.

vi) Name three special projects launched to protect (particular) endangered animals in India. Write their locations (states) too.

vii) What is monoculture? What is the danger linked to this practice?

Q.9 Answer the following in not more than 100 words. (any five) (5×5=25)

i) How is the sex of a foetus determined? Why is it prohibited by law?

ii) Write any five factors which should be considered while choosing a fuel.

iii) What is Electrolysis? Explain the process of electrolysis of water using chemical equations.

iv) a) State the laws of reflection.

b) Mention any three vision related problems and their possible causes.

v) a) Describe Eutrophication.

b) What is acid rain? Mention any two effects of it.

vi) What are secondary sexual characters? Mention the male and female secondary sexual characters in human being.

Q.10 Carefully observe the diagram given below and answer the following questions.

a) Label the given points (a, b, c, d, e, f) of the diagram. (3)

b) Name the protective membrane of eye which covers most of the eye ball. (1)

c) What is the function of ‘suspensory ligament’?

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