1~General Science

1. What is used in nuclear reactor as a moderator. It is also known as Heavy Water?

Show Answer


Ans -: Deuterium Oxide (D₂O)

2.Which Metal is in liquid state at room temperature?

Show Answer


Ans -: Mercury
¶ Mercury exists in liquid state at room temperature. Bromine(Br) also exists as liquid at room temperature however it is a non-metal. Some other metals like caesium, gallium and rubidium exists as liquid slightly above room temperature.

3._________ elements are non-metal.

Show Answer


Ans -: Electro-negative

4.What is known as Artificial Silk.

Show Answer


Ans -: Rayon

5. Nitrous Oxide (N₂O) is also known as –

Show Answer


Ans -: Laughing Gas

6. Which compound is used to prepare water proof clothes?

Show Answer


Ans -:Aluminium sulfate

7.Which Nobel Gas is also known as ‘Stranger Gas’?

Show Answer


Ans-:Xenon

8. Which Acid is known as ‘Oil of Vitriol’?

Show Answer


Ans -: Sulphuric acid(H₂SO₄)

9. For making of parachute, which polymeric substance used?

Show Answer


Ans -: Viscose

10. Acid rain is caused when the air is polluted by ____________ Gases.

Show Answer


Ans -: Nitrous Oxide(N₂O) & Sulphur dioxide(SO₂)

11. ________ is used as a Water Purifier.

Show Answer


Ans -:Chlorine

12. Aluminium is extracted from ?

Show Answer


Ans -: Bauxite

13. The ________ Process is used to synthesized Ammonia(NH₃)?

Show Answer


Ans -: Haber’s Process

14. _______ gas used to fill Balloons.

Show Answer


Ans -: Helium

15. ________ is also known as Baryta Water?

Show Answer


Ans -: Barium Hydroxide

16.Best sources for Vitamin D are –

Show Answer


Ans -: Sunlight & Fish liver

17.Which gas is the chief component of Bio-gas?

Show Answer


Ans -: Methane

18._______ is the purest form of Carbon found in Nature.

Show Answer


Ans -: Diamond

19.The Chemical name of ‘Washing Soda’ is –

Show Answer


Ans -:Sodium Carbonate

20.Chemical name of Picric Acid is –

Show Answer


Ans -:Tri Nitro Phenol

21.In Photography, which chemical used as a fixer ?

Show Answer


Ans -:Sodium thiosulphate

22.What are used to control the chain reaction in a nuclear reactor?

Show Answer


Ans -:Cadmium rods

23.In sunlight, Chloroform is converted into ___________, a poisonous gas.

Show Answer


Ans -:Phosgene

24.Which Vitamin contains Cobalt?

Show Answer


Ans -:Vitamin B12

25._______ is one of the most common preservatives used in food processing industry?

Show Answer


Ans -:Benzoic Acid

26.Which compounds are responsible for permanent hardness of water?

Show Answer


Ans -: Sulphates and Chlorides of Calcium and Magnesium

27.The temporary hardness of water is caused of because of which compounds?

Show Answer


Ans -: Bicarbonates of Calcium and Magnesium
Temporary hardness is a type of water hardness caused by the presence of dissolved bicarbonate minerals (calcium bicarbonate and magnesium bicarbonate). The presence of the metal cations makes the water hard.

28.Copper is extracted from?

Show Answer


Ans -: Copper Pyrite

29.When there is ___________, Dead organisms are transformed into petroleum and natural gas.

Show Answer


Ans -: Absence of air

30.Deuterium is ______ of Hydrogen.

Show Answer


Ans -: Isotope

31.Egg shell is made up of ________..

Show Answer


Ans -: Calcium Carbonate (CaCO₃)

32.Which Vitamins are fat Soluble?

Show Answer


Ans -: A, D, E & K

33.Fuse wire is made up of ________.

Show Answer


Ans -: Lead and Tin

34._______ is used to coat Galvanised Iron.

Show Answer


Ans -: Zinc

35.Which Gases are used by sea divers for under water breathing?

Show Answer


Ans -: Oxygen & Helium

36.Iron is extracted from

Show Answer


Ans-: Hematite

37.Kerosene is a mixture of _______.

Show Answer


Ans -:Alkanes

38.Which Element is used for making of Lead pencil ?

Show Answer


Ans -: Graphite

39.The lightest metal is _________.

Show Answer


Ans -: Lithium

40.Which Metal is found in the highest proportion in earth’s crust?

Show Answer


Ans -: Aluminium

41.Mine explosions are mostly caused by mixing of Air & __________.

Show Answer


Ans -: Methane

42.Which of the folkowing instrument is used to measure the flowing current in an electric circuit?

• A) Voltmeter
• B) Hydrometer
• C) Anemometer
• D) Ammeter

Show Answer
D) Ammeter

43.The study of flower is known as

• (A) Phrenology
• (B) Anthology
• (C) Agrostology
• (D) Palynology

Show Answer
(B) Anthology

44.The pH value of human blood ?

• (A) 5.5
• (B) 6.5
• (C) 7.5
• (D) 7.4

Show Answer
(D) 7.4

45.The vitamin that is most rapidly manufactured in our body is

• (A) Vitamin A
• (B) Vitamin B
• (C) Vitamin C
• (D) Vitamin D

Show Answer
(D) Vitamin D

46.ଡାଲିଜାତୀୟ ଉଭିଦର କେଉଁ ଅଂଶରେ ଯବକ୍ଷାରଜାନ ସଞ୍ଚିତ ହୋଇଥାଏ?

• A) ଫୁଲ
• B) ଫଳ
• C) ମୂଳ
• D) କାଣ୍ଡ

Show Answer
Ans:C) ମୂଳ

Some important elements and their scientists:-