Physics [NSTSE (National Science Talent Search Exam- Unified Council) Class 7]: Questions 79 - 83 of 191

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Question 79

Physics
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Question

MCQ▾

Cold air is:

Choices

Choice (4)Response

a.

Lighter than warm air

b.

Heavier than warm air

c.

Question does not provide sufficient data or is vague

d.

All of the above

Question 80

Physics
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Question

MCQ▾

In which of the following electrical energy is converted to heat energy?

Choices

Choice (4)Response

a.

Electric heater

Fig showing electric heater
Loading Image

b.

Steam engine

Figure showing a steam engine
Loading Image

c.

Candle

Figure showing a candle
Loading Image

d.

All of the above

Question 81

Physics
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Question

MCQ▾

Chemical reactions does not produce any heat energy if:

Choices

Choice (4)Response

a.

Energy absorbed by the reactants is less than the energy released by the products.

b.

Energy absorbed by the reactants is more than the energy released by the products.

c.

Energy absorbed by the reactants is equal to the energy released by the products.

d.

Question does not provide sufficient data or is vague

Question 82

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Question

MCQ▾

Which one is not an oscillatory motion:

Figure showing Motion of your hands while running

Figure Showing Motion of Your Hands While Running

Loading Image

Choices

Choice (4)Response

a.

Figure showing an electric bell
Loading Image

b.

Figure showing a pendulum
Loading Image

c.

Motion of the hammer of an electric bell.

d.

None of the above

Question 83

Physics
Edit

Question

MCQ▾

4.18 joules is equal to:

Choices

Choice (4)Response

a.

10 dynes

b.

10 calorie

c.

1 calorie

d.

4.18 dynes