300 Science MCQ Questions in english

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300 Science MCQ Questions in english हिन्दी

Read science multiple choice questions for the various types of competitive exams. These science questions will help students to prepare for their exams. Improve your Science subject knowledge by reading these science questions.

48. Which of the following was the first to be found in the sun's chromospheres?

A. Neon

B. Krypton

C. Helium

D. Xenon

47. Which of the following is liquid when the temperature is ambient?

A. Sodium

B. Francium

C. Cerium

D. Lithium

46. The metal sodium is stored under:

A. Water

B. Alcohol

C. Kerosene

D. Petrol

45. The mineral monazite is a

A. Zirconium

B. Thorium

C. Titanium

D. Iron

44. Together, carbon, diamond, and graphite are known as:

A. Isomorphs

B. Isotopes

C. Isomers

D. Allotrope

43. Uses for potassium nitrate include

A. Fertilizer

B. Salt

C. Glass

D. Medicine

42. Water's enduring hardness can be reduced by adding:

A. Lime

B. Sodium Carbonate

C. Potassium Permanganate

D. Alum

41. soda water includes

A. Sulphuric acid

B. Carbon dioxide

C. Carbonic acid

D. Nitrous acid

40. Heavy water is defined as:

A. Rain water

B. Deuterium oxide

C. PH7

D. Tritium oxide

39. The group of metals Fe, Co, and Ni is best known as:

A. Main group metals

B. Alkali metals

C. Transition metals

D. Rare metals

38. The chemical (Ethyl Mercaptan) added to otherwise odourless LPG cooking gas to give it a perceptible odour is a compound of:

A. Chlorine

B. Bromine

C. Sulphur

D. Fluorine

37. The element that all acids share is

A. Oxygen

B. Sulphur

C. Hydrogen

D. Carbon

36. Cooking utensils that are nonstick are coated with

A. Teflon

B. Black paint

C. Polystyrene

D. PVC

35. Silicon carbide is used in which of the following activities?

A. Disinfecting water of ponds

B. Cutting very hard substances

C. Making cement and glass

D. Making casts for statues

34. What is the approximate salinity of seawater?

A. 2.5%

B. 3%

C. 3.5%

D. 2%

33. Iron oxide is created when an iron nail rusts.

A. With decrease in the weight of the nail

B. Without any change in the weight of the nail

C. Without any change in colour or weight of the nail

D. With increase in the weight of the nail

32. The coating on galvanized iron sheets is

A. Chromium

B. Zinc

C. Tin

D. Lead

31. Among the different carbon allotropes

A. Diamond is the hardest, graphite is the softest

B. Diamond is the hardest, lamp black is the softest

C. Coke is the hardest, graphite is the softest

D. Diamond is the hardest, coke is the softest

30. Which of the following work as lubricant?

A. Iron Oxide

B. Diamond

C. Silica

D. Graphite

29. Lead tetraethyl is used as

A. Mosquito Repellent

B. Fire Extinguisher

C. Pain Killer

D. Petrol Additive

28. The inert gas that deep sea divers use to breathe in place of the nitrogen in the air is

A. Helium

B. Argon

C. Xenon

D. Krypton

27. The gases utilised in various forms of welding consist;

A. Oxygen, Hydrogen, Acetylene and Nitrogen

B. Oxygen and Acetylene

C. Oxygen, Acetylene and Argon

D. Oxygen and Hydrogen

26. When a material is exposed to air, it has the ability to absorb moisture from

A. Efflorescence

B. Desiccation

C. Deliquescence

D. Osmosis

25. Typically employed in quartz clocks and other devices, quartz crystals are chemically

A. A mixture of Germanium Oxide and Silicon dioxide

B. Sodium Silicate

C. Germanium Oxide

D. Silicon Dioxide

24. Which gas is not referred to as a greenhouse gas?

A. Nitrous oxide

B. Methane

C. Hydrogen

D. Carbon dioxide

23. What is bromine?

A. Red Liquid

B. Colourless Gas

C. Highly Inflammable Gas

D. Black Solid

22. The material that is the toughest on earth is

A. Iron

B. Gold

C. Platinum

D. Diamond

21. The type of coal where the deposit may be seen to include remnants of the original plant matter is

A. Lignite

B. Bitumen

C. Peat

D. Anthracite

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