The breaking up of an atomic nucleus into the fragment of nearly equal size is known as
nuclear fusion
nuclear fission
thermonuclear reaction
natural radioactivity
Correct answer is B
No explanation has been provided for this answer.
i and ii only
ii and iii only
i and iii only
i, ii and iii
Correct answer is C
No explanation has been provided for this answer.
Which of the following statements about a bar magnet is correct?
iron fillings cling uniformly along the length of a bar magnet
the magnetic properties are more pronounced at the middle of a magnet
it is impossible to have the same poles at the end of a magnet
the magnetic properties are more pronounced at points near the end of the bar
Correct answer is D
No explanation has been provided for this answer.
An electric lamp rated 120W is used on a 240Vrms, calculate the resistance of its filament
480\(\Omega\)
360\(\Omega\)
60\(\Omega\)
2\(\Omega\)
Correct answer is A
R = \(\frac{V^2}{P} = \frac{240^2}{120} = 480\Omega\)
0.25A
0.30A
0.35A
0.50A
Correct answer is A
I = \(\frac{E}{R + r} = \frac{1.5}{5 + 1}\)
= \(\frac{1.5}{6} = 0.25A\)