CBSE Class 8 Science - Practice Test

Sperms collect and mature in the –

Which one of the following is a plastic?

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

Natural gas is used to produce -

Fill in the blanks: The best way of attaining sexual maturity is -

Justify why - water is important for conservation and our ecosystem.

Give reasons for the following (any three)
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.

Classify the following terms (any five)
i)Asexual reproductionii)Foeticide
iii)Electrolyteiv)Accomodation
v)Biomass energyvi)Endangered species
vii)Ignition temperature

Draw and label the following (any two)
i)Female reproductive system
ii)Electroplating of spoon with silver
iii)Operations at waterworks / large scale purification of water.
iv)Fractional distillation of petroleum.

What is the phenomenon of splitting of light into its component colours on refraction?

What are the plants / animals that do not belong to a place originally and are brought from elsewhere?

What is the image formed on a metal surface by a mirror?

Explain how electricity is applied or used to get fish (any two) (2x5=10)

Describe any three methods of preventing water pollution.

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

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

Answer the following in not more than 100 words: (five)

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

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

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

a) State the laws of reflection. b) Mention any three vision related problems and their possible causes.

What is the function of 'Supersaturation'?

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