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.
Natural radioactivity consists of emission?
\(\alpha\)-particles and \(\beta\)-rays
\(\alpha\)-particles and X-rays
\(\gamma\)-ray and X-rays
\(\alpha\)-particles and \(\beta\)-rays and \(\gamma\)-rays
Correct answer is D
No explanation has been provided for this answer.
Which of the following statements on the use of X-rays is incorrect? X-rays are used
In a hospital to obtain photographs of tissues and bones in the body
For the treatment of malignant growths like cancer cells
In detecting fingerprints
To reveal hidden flaws in metal castings and welded joints work of art
Correct answer is C
No explanation has been provided for this answer.
The effect of closing the key K in the circuit shown in the figure above would be to?
increase the current by 0.4A
reduce the current by 0.4A
increase the current by 0.6A
reduce the current by 0.6A
Correct answer is A
When K is open. Total Resistance = 8 + 2 = 10\(\Omega\)
1 = \(\frac{V}{\Omega}\) = \(\frac{6v}{\Omega}\) = 0.6A
Where K is closed, \(\frac{1}{8} + \frac{1}{8} = \frac{1}{\Omega}\)
\(\frac{2}{8} = \frac{1}{\Omega}\)
\(\Omega\) = \(\frac{8}{2}\) = 4\(\Omega\)
\(\Omega\) = \(\frac{8}{2}\) = 4\(\Omega\)
4\(\Omega\) in series with 2\(\Omega\)= 6\(\Omega\)
1 = \(\frac{V}{\Omega}\) = \(\frac{6}{6}\) = 1A
1 - 0.6A = 0.4A increase
Temperature is a measure of the average kinetic energy of the molecules of a substance
Heat is a measure of the total kinetic energy of the molecules in a system
Different materials require different amounts of heat to cause a given change in temperature
All of the above
Correct answer is D
No explanation has been provided for this answer.
i, ii, iii, iv only
i, ii, iii only
iv and v only
i, ii and v only
Correct answer is B
No explanation has been provided for this answer.