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SCIENCE CLASS 8 MID TERM EXAMS 2020 - 2021

Give reasons: Aluminium foils are used to wrap food items.
Can you store lemon pickle in an aluminium utensil? Explain.
Discuss the effects of deforestation on the following.
Why should we conserve biodiversity?

Suppose your writing desk is tilted a little. A book kept on it starts sliding down.
Show the direction of frictional force acting on it.

Explain why sportsmen use shoes with spikes.
Explain in what way noise pollution is harmful to humans.
Protected forests are also not completely safe for wild animals. Why?

Which of the following can be beaten into thin sheets?

(a) Phosphorus
(b) Zinc
(c) Sulphur
(d) Oxygen
Which of the following statements is correct?
(a) All metals are ductile.
(b) All non-metals are ductile.
(c) Some non-metals are ductile.
(d) Generally, metals are ductile
Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement.
(a) rolling, static, sliding
(b) rolling, sliding, static
(c) static, sliding, rolling
(d) sliding, static, rolling
Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be
(a) wet marble floor, dry marble floor, newspaper and towel.
(b) newspaper, towel, dry marble floor, wet marble floor.
(c) towel, newspaper, dry marble floor, wet marble floor
(d) wet marble floor, dry marble floor, towel, newspaper
Sound can travel through
(a) gases only
(b) solids only
(c) liquids only
(d) solids, liquids and gases.
Which of the following voices is likely to have minimum frequency?
(a) Baby girl
(b) Baby boy
(c) A man
(d) A woman
Generally, non-metals react with acids. 
True
False
Unicellular organisms have one-celled body.
True
False
Sodium is a very reactive metal. 
True
Flase
Muscle cells are branched. (F)
True
False
Coal can be drawn into wires.
True
False
Amoeba has irregular shape. 
True
False
The number of oscillations per second of a vibrating object is called its time period.
True
False
Sound cannot travel in vacuum. 
True
False
Noise pollution may cause partial hearing impairment.
True
False
If the amplitude of vibration is large, sound is feeble.
True
False
Unwanted or unpleasant sound is termed as music. 
True
False
Phosphorus is a very ........... non-metal.
Iron is ........... reactive than copper.
Species found only in a particular area are known as ........... .
Migratory birds fly to far away places because of ........... changes.
Friction depends on the ........... of surfaces.
Sprinkling of powder on the carrom board ........... friction.
Sliding friction is ........... than the static friction.
Loudness is determined by the ........... of vibration.
Unwanted sound is called ........... .
Shrillness of a sound is determined by the ........... of vibration.
Match the substances given in Column A with their uses given in Column B.
FuelGold
ThermometerIron
Machineryaluminium
Electric wireCarbon
Wrapping foodCopper
JewelleryMercury
Explain how deforestation leads to reduced rainfall.

Look at the picture and write a short note on Nucleus of a cell.


You spill a bucket of soapy water on a marble floor accidentally. Would it make it easier or more difficult for you to walk on the floor? Why?
Explain why sliding friction is less than static friction.
Look at the sketch of larynx and explain its function in your own words.

Explain why objects moving in fluids must have special shapes.

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