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 instruments consumes the highest current?
|
I. Electric iron II. Television set III. Torch light IV. Immersion heater |
250v 220v 6v 110v |
1kW 110W 30W 500W |
2
I
II
III
IV
Correct answer is C
(I) I = \(\frac{P}{V} = \frac{1000}{25}\) = 4A
(II) I = \(\frac{110}{220}\) = 0.5A
(III) I = \(\frac{30}{6}\) = 5A
(IV) I = \(\frac{500}{110}\) = 4.55A
In the figure, the value of R is
3\(\Omega\)
6\(\Omega\)
4\(\Omega\)
5\(\Omega\)
Correct answer is B
R\(_T\) = \(\frac{V}{1} = \frac{12}{2}\) = 6\(\Omega\)
R\(_T\) = 3 + \(\frac{R \times 6}{R + 6}\)
R = 6\(\Omega\)
cooling temperature
boiling point
melting point
vaporization point
Correct answer is C
No explanation has been provided for this answer.
28.0N
48.0N
288.0N
50.0N
Correct answer is D
V.E = 6, load = 120N
Efficiency = M.A x \(\frac{1}{V.R}\) x 100%
40 = \(\frac{120}{effort}\) x \(\frac{1}{6}\) x \(\frac{100}{1}\)
Effort = 50N
0.50
0.60
1.67
2.00
Correct answer is C
Atmospheric pressure equivalence of 10m of water
: \(\frac{p_2+10}{p_1+10}\)
= \(\frac{40+10}{20+10\)
= \(\frac{50}{30}\) = 1.67