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.
If the refractive index of a medium is V2, what is the critical angle?
45o
50o12'
56o25'
75o
90o
Correct answer is A
sin C = \(\frac{1}{n}\) ; sin C = \(\frac{1}{√2}\)
C = sin-1\(\frac{1}{√2}\)
= 45o
0.026 per degree centigrade
0.00026 per degree centigrade
0.26 per degree centigrade
1.0026 per degree centigrade
0.0026 per degree centigrade
Correct answer is B
\(\alpha\) = \(\frac{L_2 - L_1}{L_1 \times \theta}\)
= \(\frac{10 - 26 - 10}{10 \times 100}\)
= 2.6 x 10-4oC
Why does a piece of cork float on water?
there is no upthrust on it when completely immersed in water
the upthrust on it when completely immersed in water is greater than its weight in air
the upthrust on it when completely immersed in water is less than its weight in air
its specific gravity is greater than that of water
its specific gravity is the same as that of water
Correct answer is B
It floats because it weighs more than amount of water it would have to push out of the glass if it sank. This means, its weight in air is less than its upthrust.
The combination of sound waves with different frequencies is known as
interference
diffraction
superposition
forced vibration
resonance
Correct answer is C
No explanation has been provided for this answer.
20cm
45cm
54cm
63cm
70cm
Correct answer is A
\(\frac{\text{image height}}{\text{object height}}\) = \(\frac{\text{image distance}}{\text{object distance}}\)
\(\frac{10}{15}\) = \(\frac{\text{image distance}}{30}\)
image distance = 20cm