A positive charged rod X is brought near as uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed; the result is that y has
A. no charge and a zero potential B. a positive charge and zero potential C. a negative charge and positive potential D. a negative charge and a negative potential Correct Answer: Option D – a negative charge and a negative...
If 1.2 x 10^6J of heat energy is given off in 1 sec from a vessel maintained at a temperature gradient of 30Km−¹; the surface area of the vessel is?
A. 1.0 x 102m2 B. 9. 0 x 102m2 C. 1.0 x 103m2 D. 9.0 x 104m2 Correct Answer: Option A – 1.0 x 102m2 Explanation Generally in thermal/heat conduction, if 1.2 x 106 J is the heat flow per seconds; 30KM-1 is the temperature gradient of the materials; and 400Wm-1K-1...
A 2000W electric heater is used to heat a metal object of mass 5kg initially at 10°C. If a temperature rise of 30°C is obtained after 10min; the heat capacity of the material is?
A. 6.0 x 104JC-1 B. 4.0 x 104JC-1 C. 1.2 x 104JC-1 D. 8.0 x 104JC-1 Correct Answer: Option A – 6.0 x 104JC-1 Explanation 2000W heater → 2000J/S => Heat supplied by the heater within 10 min (600 seconds) = 2000 x 600 = 1200000J ∴ Heat capacity MC =...
If the distance from a point source of sound is doubled; by what factor does the intensity decrease?
A. 4.00 B. 2.00 C. 0.50 D. 0.25 Correct Answer: Option A – 4.00 Explanation In general, the intensity of a wave is the rate of flow of energy across unit area normal to the direction of propagation of the wave intensity α1/r2 where r is the distance away from...
At what position will an object be placed in front of a concave mirror in order to obtain an image at infinity?
A. At the pole of the mirror B. At the principal focus C. at the center of the curvature D. Between the principal focus and the center of curvature Correct Answer: Option B – At the principal focus Explanation For a concave mirror to produce an image at...Products
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