Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
Which of the following statements about matter is not correct?
Molecules of solids move more freely than molecules of liquids and gases
Molecules of solids are more closely packed than those of liquids
Energy is required to break the intermolecular forces of attraction between molecules
Molecules of liquids move about within the liquid and they are in constant motion
Correct answer is A
All other properties of the different states of matter holds except that the molecules of solids don't move freely due to the fact that the particles in the solids are closely packed so it inhibits free motion.
3.0\(ms^{-1}\)
4.5\(ms^{-1}\)
6.0\(ms^{-1}\)
18.0\(ms^{-1}\)
Correct answer is C
Given that \(u = 0ms^{-1}, a = 2ms^{-2}, s = 9m\)
We can use the equation, \(v^{2}=u^{2} +2as\) so that we have,
\(v^{2} = 0^{2} + 2\times 2\times 9\)
\(v^{2} = 36; v= 6.0ms^{-1}\)
Note; u = Initial velocity
v = final velocity
a = acceleration
s = distance covered
Which of the following is the dimension for impulse?
MLT\(^{-1}\)
MLT\(^{-2}\)
MLT
ML
Correct answer is A
Impulse = Force \(\times\) time
Force has the dimension \(\frac{ML}{T^{2}}\), hence
Impulse= \(\frac{ML}{T^{2}} \times T = \frac{ML}{T}\)
The diagram above is a micrometer screw gauge. Determine its reading
2.44mm
2.46mm
2.86mm
2.96mm
Correct answer is B
No explanation has been provided for this answer.
A nuclide is represented by \(_{32}^{70}B\). Determine its neutron-proton ratio
0.5
0.8
1.2
1.5
Correct answer is C
The element B has a mass number of 70 with atomic number 32. Hence, B has 32 protons and (70-32) = 38 neutrons.
The neutron- proton ratio is 38:32 = \(\frac{38}{32} = 1.1875\)
\(\approxeq 1.2\)