• CBSE-VIII Science Test
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CBSE-VIII Science Test

Description: An all round knowledge of science
Number of Questions: 25
Created by:
Tags: earth surrounding universe sound friction cell chemical effect............ Science Microorganisms: Friend and Foe Domestic Use of Microorganisms Properties of Synthetic Fibres and their Applications Environmental Effects of Plastics Conduction of Electricity Through Liquids Mechanism of Production of Sound Comparison of Plant and Animal Cell Deforestation: Causes and Consequences Coal and Petroleum
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If one wants to keep food fresh for a few months, what should one do?

  1. Food should be heated to keep it warm and safe.

  2. Food should be refrigerated at about 5 degree centigrade.

  3. Food can be preserved in a deep freezer at a temperature below -18 degee centigarde.

  4. We cannot stop growth of microbes hence we cannot preserve the food.

Show answer
Correct Option: C
Explanation:

Yes, this is the correct answer. Microbes growth is stopped on extreme cooling and hence food can be preserved.

What is the unit of inheritance in living organism?

  1. Chromosome

  2. Gene

  3. Nucleus

  4. Cell

Show answer
Correct Option: B
Explanation:

Yes, it is correct as each gene carries information about a particular trait of an organism, e.g. skin colour, colour of eyes, etc.

Who developed the idea of lightning conductor to protect tall buildings?

  1. Benjamin Franklin

  2. William Gilbert

  3. Charles F. Richter

  4. None of these

Show answer
Correct Option: A
Explanation:

He found that a metal rod from the top to the bottom of a building makes the flow of lightning harmlessly pass through.

Pick the odd one from the following:

Pencillium, Paramecium, Yeast, Agaricus

  1. Pencillium

  2. Paramecium

  3. Yeast

  4. Agaricus

Show answer
Correct Option: B
Explanation:

Yes, paramecium is the only protozoa (they are unicellular animal like organism) whereas all  others are fungi (plant like organism not containing chlorophyll).They can be unicellular or multicellular.

Graphite is a _________. It is a good conductor of electricity.

  1. metal

  2. non-metal

  3. metalloid

  4. none of the above

Show answer
Correct Option: B
Explanation:

Graphite is an exception , being a non metal, it is a good conductor of electricity.

Why is crude oil known as black gold?

  1. Because of its colour.

  2. Its importance in today's world.

  3. We get gold out of this black liquid after processing.

  4. None of these

Show answer
Correct Option: B
Explanation:

Yes, its importance makes it precious and gold is precious too, so the name given as BLACK GOLD.

What do you mean by Endemic species?

  1. Species which do not adjust to enviromental changes and so their population decreases.

  2. Species which disappear from earth.

  3. Species that are found only in a particular area.

  4. None of these

Show answer
Correct Option: C
Explanation:

Yes, this is correct , they are not distributed uniformally around the globe.

Tsunami is a ________.

  1. japanese word given to a large earthquake

  2. japanese word given to a large wave

  3. japanese word given to series of giant waves

  4. japanese word given to sea storm

Show answer
Correct Option: C
Explanation:

Very true. Latest Tsunami came in Japan which is still facing its after-effects.

What is the amplitude of the oscillation?

  1. The maximum distance from the centre by which the pendulum moves.

  2. The time taken for one oscillation.

  3. It is the number of oscillations per second.

  4. The maximum distance from one end to another extreme the pendulum covers.

Show answer
Correct Option: A
Explanation:

Yes, the more the push, the more the distance the pendulum  will cover from its central position, the more its amplitude.

What is the other name of Spring harvest?

  1. Winter crops

  2. Rabi crops

  3. Kharif crops

  4. (1) and (2) are correct

Show answer
Correct Option: D
Explanation:

Yes, they are correct. Spring harvest , rabi crops and winter crops are all same

________ force is required to kick a football and __________ force is required to take out bucket full of water from well.

  1. Push, pull

  2. Pull, push

  3. Push, push

  4. None of these

Show answer
Correct Option: A
Explanation:

Push is required to move the object forward and pull is required to move the cbject towards itself

Corrosion is useful in

(a) when iron gets rusted (b) siver ornaments turn black (c) when aluminium corrodes (d) none as corrosion cannot be useful

  1. (a)

  2. (b)

  3. (c)

  4. (d)

Show answer
Correct Option: C
Explanation:

Yes, this is correct , as corrosion of newly cut aluminium forms a layer of aluminium oxide which protects the aluminium from further corrosion.

In India, coal deposits are mainly found in ___________.

  1. Jharkhand

  2. West Bengal

  3. Chhatisgarh

  4. All of these

Show answer
Correct Option: D
Explanation:

Yes, this is correct as In India coal deposits are found in all these places and Orissa, Tamil Nadu and M.P too.

Which is the man made plastic used to coat non-stick pans?

  1. Teflon

  2. Bakelite

  3. Melamine

  4. All of these

Show answer
Correct Option: A
Explanation:

Yes, it is correct ,it is a thermoplastic which is not affected by heat .

Which of the following statements is correct about sonorous substances?

  1. If a ringing sound is produced on striking the surface, the substance is known as sonorous, e.g., metals.

  2. If a substance is soluble in water, it is called sonorous.

  3. The substances that make a sound on heating are known as sonorous.

  4. Substances that react with dilute acids to produce salts are known as sonorous.

Show answer
Correct Option: A
Explanation:

Yes, it is correct, when we strike a metal plate with a metal spoon, a ringing sound is produced.

Which is the first synthetic fibre made from chemicals only?

  1. Nylon

  2. Silk

  3. Rayon

  4. Polyster

Show answer
Correct Option: A
Explanation:

Yes, nylon  was the first synthetic fibre made from chemicals.It is wrinkle resistant

Which of the following sequences of steps is correct for nitrogen cycle?

(a) Nitrogen fixation, nitrification, ammonification, nitrogen assimilation, denitrification (b) Nitrogen assimilation, nitrogen fixation, ammonification, nitrification, denitrification (c) Denitrification, nitrification, ammonification, nitrogen assimilation, nitrogen fixation (d) Nitrogen fixation, nitrogen assimilation, ammonification, nitrification, denitrification

  1. (a)

  2. (b)

  3. (c)

  4. (d)

Show answer
Correct Option: D
Explanation:

Correct sequence is Nitrogen fixation, nitrogen assimilation, ammonification, nitrification, denitrification.

When forests are cut down to use the wood for other purposes, it is called __________.

  1. afforestation

  2. desertification

  3. deforestation

  4. none of these

Show answer
Correct Option: C
Explanation:

Yes, this is correct ,cutting of forest is called deforestation.Wood  got from forest are used  to build furniture , and  the land  so obtained is used for mining, building homes etc..

_______ is the membrane which separates the outer ear from middle ear.

  1. Pinna

  2. Ear drum

  3. Ear tube

  4. None of these

Show answer
Correct Option: B
Explanation:

 Yes, this is correct, it is a tightly stretched membrane separating the outer ear from middle ear.

Where lies the blind spot region in the eye?

  1. It is a spot on the cornea.

  2. It is the junction of optic nerve and the retina.

  3. It is on the lens.

  4. None of these

Show answer
Correct Option: B
Explanation:

Yes, it is correct because here, there are no sensory cells , the image formed here cannot be seen.

Why do boys have deep voice whereas girls have high pitched voice?

  1. The voice box or larynx grow bigger in boys than girls.

  2. The boys are physically stronger than girls.

  3. The vibration made by vocal cord is more in boys.

  4. All of these together affect the sound.

Show answer
Correct Option: A
Explanation:

 Yes, the larynx gets bigger and the vocal cords lengthen and thicken, so boys'  voice gets deeper. Along with the larynx, the vocal cords grow significantly longer and become thicker.

The image formed by _________ lens varies in nature but image formed by ________ lens is always virtual.

  1. concave, convex

  2. convex, plane

  3. plane, concave

  4. convex, concave

Show answer
Correct Option: D
Explanation:

Yes, this is correct. Image formed by convex lens varies in size, position, and nature whereas images formed by concave lens are always virtual as the rays falling through it always diverge.

Who named the charges as negative and positive?

  1. William Gilbert

  2. Sir Issac Newton

  3. Benjamin Franklin

  4. None of these

Show answer
Correct Option: C
Explanation:

Yes, he observed the charges on a glass rod and ebonite rod and named them positive charge and negative charge respectively.

What is the name of the transparent liquid filled in the space between cornea and the lens?

  1. Aqueous humour

  2. Vitreous humour

  3. Corneal liquid

  4. None of these

Show answer
Correct Option: A
Explanation:

Yes , it is correct . Aqueous humour is secreted into the posterior chamber by the cilliary  body .Glaucoma disease is caused  either through increased production or decreased outflow of aqueous humour.

Plastic has a very hazardous effect on our environment. To save our environment, we should practise the four R's. What does the 4 R's (RRRR) mean?

  1. Refuse, Reduce, Reuse, Reproduce

  2. Remake, Reduce, Reuse, Recycle

  3. Refuse, Reduce, Reuse and Recycle

  4. None of these

Show answer
Correct Option: C
Explanation:

This is correct ,the four Rs which we should remember and help conserving our environment.

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