A pulse of a sound is transmitted from a ship and the reflection from the sea bed is recorded after 0.2s. Calculate the depth of the sea. [Take speed of sound in sea water = 1560m/s]
A. 312.0m B. 156.0m C. 78.0m D. 31.2m Correct Answer: Option B B. 156.0m Explanation x = vt/2 = (1560×0.2)/2 =156mIn a compound microscope, the image formed by the objective lens is at a distance of 3.0cm from the eye lens. Calculate the focal length of the eye lens.
A. 0.3cm B. 2.7cm C. 3.4cm D. 8.3cm Correct Answer: Option C C. 3.4cmA converging lens of focal length 15cm forms a virtual image at a point 10cm from the lens. Calculate the distance of the object from the lens.
A. 10.00cm B. 6.00cm C. 5.00cm D. 1.50cm Correct Answer: Option B B. 6.00cm Explanation 1/u+1/v=1/f = 1/15+1/10 u = 6.00The refractive index of a medium relative to air is 1.8. Calculate to the nearest degree, the critical angle for the medium
A. 68° B. 56° C. 34° D. 18° Correct Answer: Option C C. 34° Explanation C = sin‾¹ 1/n = sin‾¹ 1/1.8 =34°Products
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