Which would be the easiest way to burn an iron nail?

When a cork and a iron nail are placed in a beaker filled with water, the cork floats while the iron nail is submerged.
What is the reason behind it?

A

The density of cork is greater than the density of water

B

The density of iron nail is more than the density of water

C

Mass of iron nail is greater than mass of cork

D

Mass of cork is greater than mass of iron nail

Which would be the easiest way to burn a copper penny?

A

Hold the copper penny with crucible tongs, and heat strongly in the flame of a Bunsen burner.

B

Use the method in (A), but use an oxyacetylene torch to reach a higher temperature.

C

Grind the copper penny into very small, dust-sized particles, and spray the particles into a Bunsen burner flame.

D

Dissolve the copper penny in acid, precipitate the hydroxide, and heat in a Bunsen burner flame to make the oxide.

'Nail' is related to 'Nail-cutter' in the same way as 'Hair' is related to ?

A

Oil

B

Haircut

C

Scissors

D

Comb

Which is the easiest way to burn a silver coin?

A

Hold the silver coin with crucible tongs, and heat strongly in the flame of a Bunsen burner.

B

Use the method in (A), but use an oxyacetylene torch to reach a higher temperature.

C

Grind the silver coin into very small, dust-sized particles, and spray the particles into a Bunsen burner flame.

D

Dissolve the silver coin in acid, precipitate the hydroxide, and heat in a Bunsen burner flame to make the oxide.

Which of the following statements are true with respect to iron ore?
I. Limestone and coal are important for smelting iron ore
II. More than 20% of the world iron ore deposits are in India
III. Odisha and Jharkhand top in the production of iron ore
IV. Iran is the largest buyer of Indian iron ore

A

I, II and III

B

II and III

C

III and IV

D

II, III and IV

Out of the total production of iron from hematite, an ore of Iron, 20% of the ore gets wasted, and out of the remaining iron, only 25% is pure iron. If the pure iron obtained in a year from a mine of hematite was 80,000 kg, then the quantity of hematite mined from that mine in the year is

A

5,00,000 kg

B

4,00,000 kg

C

4,50,000 kg

D

None of these

Which of the following statement(s) is/are true?
1. Children bite their nails as it comforts them.
2. Children bite their nails when they are bored.
3. Slapping the children can help with nail biting.
4. Stopping nail biting is not required as it is not a major problem.

A

Only 1

B

Only 3

C

Both 1 and 2

D

None of these

“Drive the nail into the table. “Here the word 'nail' is a –

A

collective noun

B

common noun

C

meterial noun

D

proper noun

Drive the nail into the table. এখানে 'nail'' শব্দটি কোন প্রকারের noun?

A

Proper

B

Common

C

Collective

D

Material

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

Which would be the easiest way to burn an iron nail?

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