NSO Level 1- Science Olympiad (SOF) Class 10: Questions 840 - 845 of 986

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Question number: 840

» Metals and Non - Metals

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MCQ▾

Question

An amalgam alloy does not contain which of the following?

Choices

Choice (4) Response

a.

Mercury

b.

Silver

c.

Manganese

d.

Copper

Question number: 841

» Carbon and Its Componds

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MCQ▾

Question

The compound reacts with ethanoic acid and releases water. The compound is

Choices

Choice (4) Response

a.

Ethanol

b.

Ethanoic acid

c.

Methanol

d.

None of the above

Question number: 842

» Light - Reflection and Refraction

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MCQ▾

Question

Which of the following is incorrect?

Choices

Choice (4) Response

a.

When light rays meet or appear to meet after reflection from a mirror, then it is known as image

b.

Virtual image is a kind of image, which is formed by actual intersection of light rays forward after reflection

c.

Spherical Mirrors is part of hollow glass sphere whose one surface is polished

d.

Question does not provide sufficient data or is vague

Question number: 843

» Metals and Non - Metals

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MCQ▾

Question

Metal present in least amount in the human body is

Choices

Choice (4) Response

a.

Potassium

b.

Magnesium

c.

Sodium

d.

Calcium

Question number: 844

» Metals and Non - Metals

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MCQ▾

Question

Which is not correct statement for ore?

Choices

Choice (4) Response

a.

Bauxite ore Aluminium

b.

Hematite Iron

c.

Galena Lead

d.

Chalcopyrite Copper

Question number: 845

» Light - Reflection and Refraction

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MCQ▾

Question

The reflected ray will pass through the focus of a concave mirror, or it appears to pass through the focus of a convex mirror, this case will happen when

Choices

Choice (4) Response

a.

The incident ray passes through or appears to pass through the centre of curvature

b.

The incident ray is normal to the reflecting surface

c.

The incident light ray is parallel to the principal axis

d.

All of the above