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.
i, ii, iii and iv
i, ii, iv only
i, iii, iv only
ii, iii, iv only
Correct answer is B
No explanation has been provided for this answer.
14cm
28cm
75cm
150cm
Correct answer is A
F = \(\frac{uv}{u - v}\)
F = +ve
v = -ve
30 = \(\frac {25 {\times} (-v)}{25 - (-v)}\)
v = \(\frac {25 {\times} (-v)}{25+v}\)
v = 14cm
(Note that either negative or positive values go to show the positioning and hence, they are not a strong necessity in your final answer.)
t – n
t (1 + 1/n)
t (1-1/n)
t (1/n - 1)
Correct answer is C
n = \(\frac {\text{real depth}}{\text {apparent depth}{}}\)
n = \(\frac {t}{t-d}\)
\(\frac{t - d}{1}\) = \(\frac{t}{n}\)
-d = \(\frac{t}{n}\) - t
d = - \(\frac{t}{n}\) + t
d = t - \(\frac{t}{n}\)
d =t (1 - \(\frac{1}{n}\))
The most suitable type of mirror used for the construction of the search light is the?
concave mirror
convex mirror
spherical mirror
parabolic mirror
Correct answer is D
In optics, parabolic mirrors are used to gather light in reflecting telescopes and solar furnaces, and project a beam of light in flashlights, searchlights, stage spotlights, and car headlights.
30o
45o
51o
90o
Correct answer is B
Number of image = \(\frac{360}{\theta}\) -1
7 = \(\frac{360}{\theta}\) -1
thus,\(\theta\) = 45o