NSO Level 1- Science Olympiad (SOF) Class 10: Questions 798 - 800 of 986

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Question number: 798

» Chemical Reactions and Equation

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MCQ▾

Question

Two students noted the initial colour of the solutions kept in breakers, after inserting rods in each solution and leaving it undisturbed for two hours, the colour of each solution was again noted.

The observation for the chemical reaction

The Observation for the Chemical Reaction

They recorded their observations in the form of table given below:

Table of the Color of the solution

Table of the Color of the solution

Student

Colour of the solution

A

Initial

Final

Colorless

Colorless

Colorless

Colorless

Colorless

Colorless

Colorless

Colorless

B

Initial

Final

Colorless

Colorless

Light Green

Colorless

Colorless

Colorless

Blue

Reddish brown

Which student noted the color change in all the two beakers correctly?

Choices

Choice (4)Response

a.

B student

b.

A student

c.

None of the above

d.

All of the above

Question number: 799

» Light - Reflection and Refraction

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MCQ▾

Question

The rays of a parallel beam of light do not remain parallel after reflection from

Choices

Choice (4)Response

a.

Convex mirror

b.

Irregular reflecting surface

c.

Concave mirror

d.

Plane mirror

Question number: 800

» Chemical Reactions and Equation

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MCQ▾

Question

Which of the following is not true?

Choices

Choice (4)Response

a.

If a substance loses oxygen during a reaction, it is said to be oxidized.

b.

At high temperature, almost all metals (except Ag, Au and Pt) are oxidized.

c.

Alkali metals (Li, Na, K etc. ) and alkaline earth metals (Mg, Ca, Sn, etc. ) are rapidly oxidized at low temperature.

d.

Question does not provide sufficient data or is vague

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