General science

1. Heavy water is: A. Deuterium oxide B. PH7 C. Rain water D. Tritium oxide

Deuterium oxide
PH7
Rain water
Tritium oxide

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oxide" class="read-more button" href="https://exam.pscnotes.com/mcq/heavy-water-is-a-deuterium-oxide-b-ph7-c-rain-water-d-tritium-oxide/#more-21622">Detailed SolutionHeavy water is: A. Deuterium oxide B. PH7 C. Rain water D. Tritium oxide

2. The group of metals Fe, Co, Ni may best called as: A. Transition metals B. Main group metals C. Alkali metals D. Rare metals

Transition metals
Main group metals
Alkali metals
Rare metals

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C. Alkali metals D. Rare metals" class="read-more button" href="https://exam.pscnotes.com/mcq/the-group-of-metals-fe-co-ni-may-best-called-as-a-transition-metals-b-main-group-metals-c-alkali-metals-d-rare-metals/#more-21621">Detailed SolutionThe group of metals Fe, Co, Ni may best called as: A. Transition metals B. Main group metals C. Alkali metals D. Rare metals

3. Among the various allotrope of carbon A. Coke is the hardest, graphite is the softest B. Diamond is the hardest, coke is the softest C. Diamond is the hardest, graphite is the softest D. Diamond is the hardest, lamp black is the softest

Coke is the hardest, graphite is the softest
Diamond is the hardest, coke is the softest
Diamond is the hardest, graphite is the softest
Diamond is the hardest, lamp black is the softest

Detailed SolutionAmong the various allotrope of carbon A. Coke is the hardest, graphite is the softest B. Diamond is the hardest, coke is the softest C. Diamond is

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the hardest, graphite is the softest D. Diamond is the hardest, lamp black is the softest

4. Galvanised iron sheets have a coating of A. Lead B. Chromium C. Zinc D. Tin

Lead
Chromium
Zinc
Tin

Detailed Solution

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class="screen-reader-text">Galvanised iron sheets have a coating of A. Lead B. Chromium C. Zinc D. Tin

5. In which of the following activities silicon carbide is used? A. Making cement and glass B. Disinfecting water of ponds C. Cutting very hard substances D. Making casts for statues

Making cement and glass
Disinfecting water of ponds
Cutting very hard substances
Making casts for statues

Detailed Solution Subscribe on YouTube

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class="screen-reader-text">In which of the following activities silicon carbide is used? A. Making cement and glass B. Disinfecting water of ponds C. Cutting very hard substances D. Making casts for statues

6. When an iron nail gets rusted, iron oxide is formed A. Without any change in the weight of the nail B. With decrease in the weight of the nail C. With increase in the weight of the nail D. Without any change in colour or weight of the nail

Without any change in the weight of the nail
With decrease in the weight of the nail
With increase in the weight of the nail
Without any change in colour or weight of the nail

Detailed SolutionWhen an iron nail gets rusted, iron oxide is formed A. Without any change in the weight of

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the nail B. With decrease in the weight of the nail C. With increase in the weight of the nail D. Without any change in colour or weight of the nail

7. The property of a substance to absorb moisture from the air on exposure is called A. Osmosis B. Deliquescence C. Efflorescence D. Desiccation

Osmosis
Deliquescence
Efflorescence
Desiccation

Detailed SolutionThe property of a substance to absorb moisture from the air

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on exposure is called A. Osmosis B. Deliquescence C. Efflorescence D. Desiccation

8. The gases used in different types of welding would include A. Oxygen and Hydrogen B. Oxygen, Hydrogen, Acetylene and Nitrogen C. Oxygen, Acetylene and Argon D. Oxygen and Acetylene

Oxygen and Hydrogen
Oxygen, Hydrogen, Acetylene and Nitrogen
Oxygen, Acetylene and Argon
Oxygen and Acetylene

Detailed SolutionThe gases used in different types

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of welding would include A. Oxygen and Hydrogen B. Oxygen, Hydrogen, Acetylene and Nitrogen C. Oxygen, Acetylene and Argon D. Oxygen and Acetylene

9. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is A. Argon B. Xenon C. Helium D. Krypton

Argon
Xenon
Helium
Krypton

Detailed SolutionThe inert gas which is substituted for

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nitrogen in the air used by deep sea divers for breathing, is A. Argon B. Xenon C. Helium D. Krypton

10. Which of the following is used as a lubricant? A. Graphite B. Silica C. Iron Oxide D. Diamond

Graphite
Silica
Iron Oxide
Diamond

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576 512"> Subscribe on YouTube Iron Oxide D. Diamond" class="read-more button" href="https://exam.pscnotes.com/mcq/which-of-the-following-is-used-as-a-lubricant-a-graphite-b-silica-c-iron-oxide-d-diamond/#more-21613">Detailed SolutionWhich of the following is used as a lubricant? A. Graphite B. Silica C. Iron Oxide D. Diamond

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