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Free download in PDF CBSE Class 8 Science Objective Type Questions & Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE class 8 Students.
(21)
The shape of the airplane is like a
[A]
Bird
[B]
Dog
[C]
Car
[D]
none of these
(22)
Rolling friction is smaller than?
[A]
Sliding friction
[B]
Static friction
[C]
Fluid friction
[D]
All of the above
(23)
Lubricants ________
[A]
Increase friction
[B]
Reduce friction
[C]
Both (a) and (b)
[D]
None
(24)
Friction is a /an_______
[A]
Evil
[B]
Foe
[C]
Both (a) and (b)
[D]
None
(25)
On what force of friction depends?
[A]
Smoothness of surface
[B]
Roughness of surface
[C]
Inclination of surface
[D]
All of above
(26)
Fluid are____
[A]
Gases
[B]
Liquids
[C]
Gases and liquids both
[D]
None of these
Answer: Gases and liquids both
(27)
What kind of substances are known as lubricants
[A]
Increase friction
[B]
Decrease friction
[C]
Increase or decrease friction
[D]
None of these
Answer: Decrease friction
(28)
Friction is a __________
[A]
Contact force
[B]
Non-contact force
[C]
Magnetic force
[D]
None of these
(29)
Which one of these characteristics does a smooth surface has?
[A]
Less frictional force
[B]
More frictional force
[C]
Sometimes less and sometimes more force
[D]
All of above
Answer: Less frictional force
(30)
Complete the sentence. Friction always ____________
[A]
helps the motion
[B]
opposes the motion
[C]
both of these
[D]
none of these
Answer: opposes the motion
31
Microorganisms are
[A]
Unicellular
[B]
Multi-cellular
[C]
Both
[D]
None of these
32
Penicillium is a
[A]
Algae
[B]
Fungus
[C]
Bacteria
[D]
Yeast
33
Malaria Is caused by
[A]
Protozoa
[B]
Virus
[C]
Algae
[D]
Bacteria
34
Rhizobium becteria
[A]
Help in digestion
[B]
Help in nitrogen fixation
[C]
Cause diseases
[D]
All of the above
Answer: Help in nitrogen fixation
35
Scientist who discovered fermentation is
[A]
Alexander Fleming
[B]
Louis Pasteur
[C]
John Mendal
[D]
Edward Jenner
36
Amoeba belongs to
[A]
Algae
[B]
Fungi
[C]
Protozoa
[D]
Virus
37
Mushroom belongs to
[A]
Algae
[B]
Virus
[C]
Fungi
[D]
None of these
38
Amount of nitrogen in the atmosohere is
[A]
58%
[B]
68%
[C]
78%
[D]
88%
39
Vaccine for small pox is discorvered by
[A]
Louis Pasteur
[B]
Alexander Fleming
[C]
Edward Jenner
[D]
John Mendal
40
Spyrogyra is
[A]
An algae
[B]
A fungi
[C]
A protozoa
[D]
A bacteria
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