physics

Two spheres of masses 100kg and 90kg respectively have their centres separated by a distance of 1.0m. Calculate the magnitude of the force of attraction between them. [G = 6.70 x 10‾¹¹Nm‾²kg‾²]

A. 6.70 x 10^-11N B. 6.70 x 10^-10N C. 6.03 x 10^-11N D. 6.03 x 10^-7N Correct Answer: Option D…

6 years ago

Three capacitors each of capacitance 18μF are connected in series. Calculate the effective capacitance of the capacitors

A. 54.00μF B. 18.00μF C. 6.00μF D. 0.17μF Correct Answer: Option C C. 6.00μF Explanation 1/c=1/18+1/18+1/18 = 3/18 c =…

6 years ago

Which of the following items can be used to compare the relative magnitudes of electric charges on two bodies?

A. ebonite rod B. gold leaf electroscope C. proof plane D. the electrophorus Correct Answer: Option B B. gold leaf…

6 years ago

Which of the following actions will not cause an increase in the frequency of a vibrating string?

A. increasing the tension of the string B. decrease the mass per unit length of the string C. decrease the…

6 years ago

Which of the following instruments is not a wind instrument?

A. clarinet B. saxophone C. trumpet D. xylophone Correct Answer: Option D D. xylophone

6 years ago

When two notes of nearly equal frequencies are sounded together, periodic rise and fall in sound intensity can be heard. This phenomenon can be called

A. beats B. diffraction C. overtones D. resonance Correct Answer: Option A A. beats

6 years ago

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…

6 years ago

In 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. 3.4cm

6 years ago

A 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 years ago

The 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 =…

6 years ago
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