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.
s = ut+\(\frac{1}{2}\)at2
v2 = u2 + 2as
v =u + at
v = u + 2as
s = \(\frac{1}{2}\)(u+v)t
Correct answer is D
No explanation has been provided for this answer.
4.8 × 10-19Hz
9.3 × 10-7Hz
4.8 × 1014Hz
7.3 × 1014Hz
9.3 × 1014Hz
Correct answer is D
The work function (\(\phi\)) of a metal is defined as:
\(\phi = hf_0\)
\(f_0 = \frac{\phi}{h}\)
\(\phi = 3.0 eV = 3.0 \times 1.6 \times 10^{-19}\)
= \(4.8 \times 10^{-19} J\)
\(f_0 = \frac{4.8 \times 10^{-19}}{6.6 \times 10^{34}}\)
= \(0.727 \times 10^{15} s^{-1}\)
= \(7.27 \times 10^{14} s^{-1}\)
\(\approxeq 7.3 \times 10^{14} Hz\)
A lead-acid accumulator is used in preference to a dry battery in a car because
a dry battery cannot supply the necessary high voltage
a dry battery would not operate on a cold frosty morning
the accumulator can give a bigger current and can be recharged
the accumulator can supply a.c
the chemicals used in a dry battery constitute a fire hazard.
Correct answer is C
No explanation has been provided for this answer.
What gives rise to the line spectra observed in atoms?
change of an electron from a higher to a lower energy level in the atom
disturbed protons in the nucleus
excitation of an electron in the atom
kinetic energy of a moving atom
potential energy of an electron inside an atom
Correct answer is A
No explanation has been provided for this answer.
420 J
1680 J
1701 J
2100 J
3780 J
Correct answer is E
No explanation has been provided for this answer.