List of top Science Questions asked in CBSE Class VIII

Does pure water conduct electricity? If not, what can we do to make it conducting?

A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. You would conclude that

Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain.

Prepare a Table having two columns depicting names of endocrine glands and hormones secreted by them.

Paheli had heard that rainwater is as good as distilled water. So she collected some rainwater in a clean glass tumbler and tested it using a tester. To her surprise she found that the compass needle showed deflection. What could be the reasons?

Name three liquids, which when tested in the manner shown in Fig.11.9, may cause the magnetic needle to deflect.

List changes in the body that take place at puberty.

Explain the process of formation of petroleum.

Explain why fossil fuels are exhaustible natural resources.

Suppose you are outside your home and an earthquake strikes. What precaution would you take to protect yourself?

Describe how coal is formed from dead vegetation. What is this process called?

List three states in India where earthquakes are more likely to strike.

What is menstruation? Explain.

Suggest three measures to protect ourselves from lightning.

Name the petroleum product used for surfacing of roads.

Write T against true and F against false in the following statements.

1. Like charges attract each other (T/F)
2. A charged glass rod attract a charged plastic straw (T/F)
3. Lightning conductor cannot protect a building from lightning (T/F)
4. Earthquakes can be predicted in advance (T/F)

When a glass rod is rubbed with a piece of silk cloth the rod

Which of the following cannot be charged easily by friction?

Define adolescence.

Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose water will get heated in a shorter time?

Can the process of rusting be called combustion? Discuss.

What is metamorphosis? Give examples.

In which female reproductive organ does the embryo get embedded?

Indicate whether the following statements are True (T) or False (F).

1. Oviparous animals give birth to young ones. ( )
2. Each sperm is a single cell. ( )
3. External fertilisation takes place in frog. ( )
4. A new human individual develops from a cell called gamete. ( )
5. Egg laid after fertilisation is made up of a single cell. ( )
6. Amoeba reproduces by budding. ( )
7. Fertilisation is necessary even in asexual reproduction. ( )
8. Binary fission is a method of asexual reproduction. ( )
9. A zygote is formed as a result of fertilisation. ( )
10. An embryo is made up of a single cell. ( )

Choose the most appropriate answer.
The number of nuclei present in a zygote is