CBSE Class 8 Science Objective Type Questions & Answers

Questions

21 The shape of the airplane is like a

A Bird

B Dog

C Car

D none of these

View Answer

Answer: Bird

22 Rolling friction is smaller than?

A Sliding friction

B Static friction

C Fluid friction

D All of the above

View Answer

Answer: All of the above

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23 Lubricants ________

A Increase friction

B Reduce friction

C Both (a) and (b)

D None

View Answer

Answer: Reduce friction

24 Friction is a /an_______

A Evil

B Foe

C Both (a) and (b)

D None

View Answer

Answer: Both (a) and (b)

25 On what force of friction depends?

A Smoothness of surface

B Roughness of surface

C Inclination of surface

D All of above

View Answer

Answer: All of above

26 Fluid are____

A Gases

B Liquids

C Gases and liquids both

D None of these

View Answer

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

View Answer

Answer: Decrease friction

28 Friction is a __________

A Contact force

B Non-contact force

C Magnetic force

D None of these

View Answer

Answer: Contact force

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

View Answer

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

View Answer

Answer: opposes the motion

31 Microorganisms are

A Unicellular

B Multi-cellular

C Both

D None of these

View Answer

Answer: Multi-cellular

32 Penicillium is a

A Algae

B Fungus

C Bacteria

D Yeast

View Answer

Answer: Fungus

33 Malaria Is caused by

A Protozoa

B Virus

C Algae

D Bacteria

View Answer

Answer: Protozoa

34 Rhizobium becteria

A Help in digestion

B Help in nitrogen fixation

C Cause diseases

D All of the above

View Answer

Answer: Help in nitrogen fixation

35 Scientist who discovered fermentation is

A Alexander Fleming

B Louis Pasteur

C John Mendal

D Edward Jenner

View Answer

Answer: Louis Pasteur

36 Amoeba belongs to

A Algae

B Fungi

C Protozoa

D Virus

View Answer

Answer: Protozoa

37 Mushroom belongs to

A Algae

B Virus

C Fungi

D None of these

View Answer

Answer: Fungi

38 Amount of nitrogen in the atmosohere is

A 58%

B 68%

C 78%

D 88%

View Answer

Answer: 78%

39 Vaccine for small pox is discorvered by

A Louis Pasteur

B Alexander Fleming

C Edward Jenner

D John Mendal

View Answer

Answer: Edward Jenner

40 Spyrogyra is

A An algae

B A fungi

C A protozoa

D A bacteria

View Answer

Answer: A fungi

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