NSO Level 1- Science Olympiad (SOF) Class 8: Questions 1006 - 1009 of 1076

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Question number: 1006

» Mental Ability

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Appeared in Year: 2012

MCQ▾

Question

Observe the given apparatus carefully showing an activity performed to compare the carbon Dioxide content to inhaled and exhaled air. What would be the observation for T1 and T2 test tubes and its correct explanation [ ( ) indicates milky coloration in limewater]

Image shows The Mouthpiece

Image Shows the Mouthpiece

Image shows The Mouthpiece

Choices

Choice (4) Response

a.

T1: ++, T2: +++

b.

T1: ++++, T2: +

c.

T1: ++, T2: ++

d.

T1: +, T2: ++++

Question number: 1007

» Some Natural Phenomena

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MCQ▾

Question

The principle on which it works is

Choices

Choice (4) Response

a.

Like charges attract and unlike charges repel each other

b.

Like charges repel and unlike charges attract each other

c.

Like charges repel and unlike charges attract each other and Like charges attract and unlike charges repel each other

d.

Question does not provide sufficient data or is vague

Question number: 1008

» Chemical Effects of Electric Current

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MCQ▾

Question

Pick out the incorrect statement

1. Acids are good conductors of electricity.

2. Bases are good conductors of electricity.

3. Neutral solutions are poor conductors of electricity.

Choices

Choice (4) Response

a.

2

b.

1

c.

3

d.

All of the above

Question number: 1009

» Microorganisms

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Appeared in Year: 2012

MCQ▾

Question

Latika observed her grandmother adding lots of salt on unripe mangoes to prepare pickles. Her grandmother also added excess of oil in the pickle jar. What could be reason for it?

Choices

Choice (4) Response

a.

Salt prevents growth of microorganisms by retaining moisture in the food item and oil prevents their growth by forcing out water from them by osmosis.

b.

Salt prevents growth of microorganisms by retaining moisture in the food item and oil provides an environment in which microorganisms cannot grow.

c.

Salt prevents growth of microorganisms by forcing them to lose water by osmosis and oil provides an environment in which microorganisms cannot grow.

d.

Salt prevents growth of microorganisms by forcing them to lose water by osmosis and oil prevents their growth by retaining moisture in the food item.

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