NSO Level 1- Science Olympiad (SOF) Class 7: Questions 234 - 237 of 593

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Question number: 234

» Physical and Chemical Changes

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MCQ▾

Question

Which of the following is the term used for the process of depositing a layer of one metal over another metal to protect it from rusting.

Choices

Choice (4) Response

a.

Crystallization

b.

Neutralization

c.

Amalgamating

d.

Galvanization

Question number: 235

» Acids, Bases and Salts

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MCQ▾

Question

Purple color of solution indicates which of the following?

Choices

Choice (4) Response

a.

Basic Solution

b.

A salt Solution

c.

Neutral Solution

d.

Acidic Solution

Question number: 236

» Fibre to Fabric

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MCQ▾

Question

Cotton burns with the smell of burning paper. This is because

Choices

Choice (4) Response

a.

Paper is also a plant product

b.

Paper has cotton fibres

c.

All of the above

d.

Question does not provide sufficient data or is vague

Question number: 237

» Fibre to Fabric

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MCQ▾

Question

Following are the given stages involved in the life cycle of a silk moth. Arrange them in a proper sequence by selecting the correct option.

The life cycle of a silk moth

The Life Cycle of a Silk Moth

The life cycle of a silk moth

  1. Caterpillar called silk worm comes out of eggs.

  2. Silk moth lays eggs.

  3. Pupa comes out of cocoon as a moth after metamorphosis.

  4. Larva weaves a net and secretes a fibre made of protein, which hardens on exposure to air.

  5. Larva feeds on leaves and grows.

  6. Larva covers itself completely within the tightly woven fibre, which is called cocoon.

Choices

Choice (4) Response

a.

(2), (3), (5), (4), (6), (1).

b.

(3), (4), (6), (5), (1), (2).

c.

(2), (1), (5), (4), (6), (3).

d.

(1), (2), (6), (4), (5), (3).

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