NSO Level 1- Science Olympiad (SOF) Class 8: Questions 536 - 542 of 1076

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Question number: 536

» Metals and Non-Metals

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MCQ▾

Question

Which of the following is the most reactive metal?

Choices

Choice (4)Response

a.

Sodium

b.

Silver

c.

Copper

d.

Gold

Passage

Read the description carefully and answer the questions. Anjali was doing an experiment. She took a dish. Placed two lighted candles in it. One long and the other long. She put some baking soda in the dish and placed it in a bowl. The she poured some vinegar in the dish.

Question number: 537 (1 of 6 Based on Passage) Show Passage

» Combustion and Flame

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MCQ▾

Question

Where does the carbon dioxide come from?

Choices

Choice (4)Response

a.

Baking soda reacts with moisture to release carbon dioxide

b.

Atmospheric carbon dioxide dissolved in baking soda

c.

Baking soda reacts with oxygen to form carbon dioxide

d.

Vinegar reacts with baking soda to form carbon dioxide

Question number: 538 (2 of 6 Based on Passage) Show Passage

» Combustion and Flame

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MCQ▾

Question

What would be her observation?

Choices

Choice (4)Response

a.

There was no change in the baking soda

b.

Fumes came out

c.

Bubbles started to come out

d.

Baking soda completely dissolved in vinegar

Question number: 539 (3 of 6 Based on Passage) Show Passage

» Combustion and Flame

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MCQ▾

Question

What do you think about the bubbles?

Choices

Choice (4)Response

a.

It is oxygen gas

b.

It is carbon dioxide gas

c.

It is heat

d.

It is hydrogen gas

Question number: 540 (4 of 6 Based on Passage) Show Passage

» Combustion and Flame

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MCQ▾

Question

Which of the two candles will get extinguished first?

Choices

Choice (4)Response

a.

Larger one

b.

Smaller one

c.

Simultaneously

d.

All of the above

Question number: 541 (5 of 6 Based on Passage) Show Passage

» Combustion and Flame

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MCQ▾

Question

The chemical equation for the reaction between baking soda and vinegar is

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 542 (6 of 6 Based on Passage) Show Passage

» Combustion and Flame

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MCQ▾

Question

In the above experiment, the candles get extinguished. What do this indicate?

Choices

Choice (4)Response

a.

Presence of gas

b.

Presence of gas

c.

Presence of gas

d.

Question does not provide sufficient data or is vague

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