10-2mm
10-3mm
10-4mm
10-5mm
10-6mm
Correct answer is E
m = Itz
density = \(\frac{\text{mass}}{\text{area x thickness}}\)
Density = \(\frac{Itz}{A \times h}\)
\(10^4 = \frac{0.5 \times 100 \times 60 \times 0.0003}{100 \times h}\)
h = 9 x 10-7cm = 9 x 10-6mm
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.