مركز الاختبارات الالكترونية

SCIENCE CLASS 8 MID TERM EXAMS 2020 - 2021

General Instructions:

Read the questions carefully.

Marks are indicated against each question.

Check your paper before you submit it.

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.
reactive
active
inactive

Iron is[ ................... ]reactive than copper.
less
more

Species found only in a particular area are known as[ ................... ].
endemic
endanger

Migratory birds fly to far away places because of [ ................... ]changes.
seasonal
climatic

Friction depends on the[ ................... ]of surfaces.
nature
kind

Sprinkling of powder on the carrom board[ ................... ]friction.
increases
reduces

Sliding friction is[ ................... ]than the static friction.
less
more

Loudness is determined by the[ ................... ]of vibration.
attitude
amplitude
aptitude

Unwanted sound is called[ ................... ].
noice
music
horn

Shrillness of a sound is determined by the[ ................... ]of vibration.
pitch
frequency

Match the substances given in Column A with their uses given in Column B.

Fuel
Thermometer
Machinery
Electric wire
Wrapping food
Jewellery
Gold
Iron
aluminium
Carbon
Copper
Mercury

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.

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?

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