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Science MCQs

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Total Questions
2100
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Question 1181 Medium

Why is mercury used in thermometers?

A
It expands uniformly
B
It is cheap
C
It is safe
D
It contracts only
Question 1182 Medium

Which phenomenon explains the tightening of rivets upon cooling?

A
Contraction
B
Expansion
C
Conduction
D
Radiation
Question 1183 Medium

How many equal divisions are there between the fixed points on the Celsius scale?

A
100
B
180
C
273
D
212
Question 1184 Medium

How many equal divisions are there between the fixed points on the Fahrenheit scale?

A
180
B
100
C
32
D
212
Question 1185 Medium

What is the SI unit of heat?

A
Kelvin (K)
B
Joule (J)
C
Calorie (cal)
D
Watt (W)
Question 1186 Medium

What is a common non-SI unit of heat?

A
Kelvin
B
Calorie
C
Joule
D
Newton
Question 1187 Medium

Why do particles in a solid move further apart when heated?

A
They become lighter
B
They vibrate more vigorously
C
They change state
D
They lose electrons
Question 1188 Medium

Which expands more for the same rise in temperature: a solid or a liquid?

A
Solid
B
Liquid
C
Both expand equally
D
Gas
Question 1189 Medium

Why are rivets heated before being used?

A
They become stronger
B
They soften and are easier to hammer
C
They change color
D
They expand and fit loosely
Question 1190 Medium

What is the purpose of the rollers used in the supports of a bridge?

A
To allow for expansion and contraction
B
To make the bridge look good
C
To reduce construction cost
D
To support more weight
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