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Science MCQs

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Total Questions
2100
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Question 1161 Hard

Why does water level first fall when a flask is heated?

A
Flask expands first
B
Liquid contracts
C
Air expands
D
Liquid evaporates
Question 1162 Hard

What is the key difference between heat and temperature?

A
Heat is total energy; temperature is average energy
B
Heat is measured in Kelvin, temperature in Joule
C
Temperature is total energy; heat is average energy
D
They are the same
Question 1163 Hard

Why are metals better conductors of heat than wood?

A
They have free electrons
B
They are heavier
C
They are shinier
D
They are denser
Question 1164 Hard

What is the key feature of a vacuum flask that minimizes heat transfer?

A
It has a vacuum between double walls
B
It is made of metal
C
It has a shiny surface
D
It is very thick
Question 1165 Hard

What does the term "apparent expansion" of a liquid refer to?

A
The true expansion of the liquid
B
The observed expansion relative to the container
C
The expansion of the container
D
The contraction of the liquid
Question 1166 Medium

Which of the following best describes heat?

A
Average kinetic energy of particles
B
Total kinetic energy of all particles
C
Degree of hotness
D
Form of matter
Question 1167 Medium

What is 37°C in Kelvin?

A
273 K
B
310 K
C
300 K
D
236 K
Question 1168 Medium

What is the formula to convert Fahrenheit to Celsius?

A
°C = (9/5)(°F + 32)
B
°C = (5/9)(°F - 32)
C
°C = °F - 32
D
°C = °F + 273
Question 1169 Medium

What is 98.6°F in Celsius?

A
100°C
B
37°C
C
32°C
D
212°C
Question 1170 Medium

Why do solids expand when heated?

A
Particles lose energy
B
Particles vibrate more and move apart
C
Particles contract
D
Particles become heavier
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