NSO Level 1- Science Olympiad (SOF) Class 8: Questions 531 - 535 of 1175

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Question 531

Question

MCQ▾

Sita bought a copper lamp as a decorative piece and displayed it in her show case. After a month she found that it looked dull with green patches on it. She was so shocked to see this. The green material is

Choices

Choice (4)Response

a.

A mixture of copper hydroxide and copper carbonate

b.

Copper carbonate

c.

Copper hydroxide

d.

All of the above

Question 532

Question

MCQ▾

Iron is used in construction work in RCC and making grills. Which property of metals is used here?

Choices

Choice (4)Response

a.

Ductility

b.

Malleability

c.

Hardness and strength

d.

Both b. and c. are correct

Question 533

Question

MCQ▾

This metal reacts with dilute sulphuric acid and release hydrogen

Choices

Choice (4)Response

a.

Gold

b.

Silver

c.

Copper

d.

Magnesium

Question 534

Question

MCQ▾

Which of the following metals does not react with concentrated hydrochloric acid?

Choices

Choice (4)Response

a.

Potassium

b.

Iron

c.

Copper

d.

Zinc

Question 535

Question

MCQ▾

We are familiar with the four R՚s used in environment protection. Identify the R used in the situations

Raju՚s family donated their old TV, Fridge, Washing Machine and Computer to a poor family in the village.

Choices

Choice (4)Response

a.

Recycle

b.

Reuse

c.

Recover

d.

Reduce

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