EVENTS CONVENT HIGH SCHOOL
70,LALA LAJPAT RAI COLONY,
BAGH DILKUSHA
SLOT 1 SCIENCE REVISION QUESTIONS
CLASS-8
A. Answer
the following Questions:-
Que-1
Explain how fertilizer are different
from manure?
Que-2
What is irrigation? Describe two methods
of irrigation which conserve water?
Que-3
If wheat is sown in the kharif season,
what would happen Discuss?
Que-4
Write a paragraph in your own words on each of the following:
a. Weeding b. Threshing
Que-5
Can microorganisms be seen with the
naked eyes? If not how can they be seen?
Que-6
What are the major groups of
microorganisms?
Que-7
Name the micro-organism which can fix
atmospheric nitrogen in the soil?
Que-8
Explain the difference between
thermoplastic and thermosetting plastic?
Que-9
What is the difference between noise and
music? Can music become noise sometimes?
Que-10
List the source of noise pollution in your surroundings?
Que-11
List sources of Noise pollution if your surroundings?
Que-12
Explain in what way Noise pollution is harmful to humans?
Que-13
Does Pure water conduct electricity? If not what can we do to make it
conducting?
Que-14
In case of a fire before the fireman use the water hoses.......?
Que-15
What are weeds? How can we control them?
B.Fill in
the blanks :-
1.
The same kind of plants grown and cultivated on a large scale at a place is
called Crop.
2.
The first step before growing crops is Preparation of the soil.
3.
Microorganisms can be seen with the help
of a microscope .
4. Alcohol is produced with the help of Yeast
5. Cholera is produced by Bacteria.
6.
Synthetic fibres are synthsised from raw material called Petrochemical.
7.
Loudness is determined by the amplitude of vibration.
8.The
unit of Frequency is Hertz
9.
Un wanted sound is called Noise.
10.
Shrillness of a sound is determined by the frequency of vibration.
11.
Most liquids that conduct electricity are solutions of acid, base
and solid.
12.The
passage of an electric current through a solution causes Chemical
effects.
C.Match the
following:-
1.
Kharif Crops - Paddy and maize
2.
Rabi crops - wheat gram pea
3.
Chemical fertilizer - Urea and phosphate
4.
Bacteria - Causing Cholera
5.
Yeast - Baking of Bread
6.
A protozoan - Causing Cholera
7.
A virus - Causing AIDS
8.Rhizobium - Fixing Nitrogen
9.Lactobacillus - setting of curd
10.
Organic Manure - cow dung, and plant waste.
11.
Cutting Crops - Harvester
12.
Providing water - Irrigation
D.Draw a Diagram of Nitrogen Cycle
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Thank your for your valuable responce.
Mrfarooqui