Physics [NSTSE (National Science Talent Search Exam- Unified Council) Class 7]: Questions 46 - 51 of 191

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Question 46

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Question

MCQ▾

The initial and the final velocity of a car was 0 km/hr and 90 km/hr. Find the acceleration of the car if the time taken was 10 seconds.

Choices

Choice (4)Response

a.

b.

c.

d.

Question 47

Physics
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Question

MCQ▾

Why sand is used as a fire extinguisher to prevent small fires?

Figure showing bucket filled with sand

Figure Showing Bucket Filled with Sand

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Choices

Choice (4)Response

a.

Because sand is cheap.

b.

Because sand cover up all oxygen from the fire.

c.

Because sand is easily available

d.

All a. , b. and c. are correct

Question 48

Physics
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Question

MCQ▾

Which of the following is bad conductor of heat?

Choices

Choice (4)Response

a.

Gold

Figure showing gold
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b.

Mercury

Figure showing mercury metal
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c.

Glass

Figure showing glass surface
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d.

Silver

Figure showing silver
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Question 49

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Question

MCQ▾

A pendulum of a clock takes 45 seconds to complete 15 oscillations, calculate its time period.

Figure showing pendulum of a clock

Figure Showing Pendulum of a Clock

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Choices

Choice (4)Response

a.

4 sec

b.

9 sec

c.

3 sec

d.

6 sec

Question 50

Physics
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Question

MCQ▾

In a village all the rivers and lakes got dried up in summer, this process can be called as:

Choices

Choice (4)Response

a.

Evaporation

b.

Sublimation

c.

Condensation

d.

Melting

Question 51

Physics
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Question

MCQ▾

For very high temperature range, which type of thermometers can be used?

Choices

Choice (4)Response

a.

Galileo thermometers

b.

Water thermometers

c.

Mercury Thermometers

d.

Question does not provide sufficient data or is vague