In the diagram above, a bulb is lit by drawing 2.0A from 440V a.c. source. Calculate the cost of keeping the bulb on for two days at $0.40 per kilowatt-hour.
A. $16.90 B. $84.48 C. $1690.00 D. $8.48 Correct Answer: Option A = $16.90 Explanation Power [p] = IV → 2 * 440 = 880Watt Energy = p * t = 880 * 48hrs = 42240 or 42.24kwh But 1 kwh cost $0.40 ∴ 42.24kwh costs 42.24 x 0.40 = 16.896 or...
An electric pressing iron is connected to the mains using an insulated wire. wire becomes very hot. The heat generated in the wire can be minimized by replacing the wire with one of?
A. thinner insulation. B. greater diameter. C. smaller diameter. D. thicker insulation. Correct Answer: Option B = greater diameter.
Which of the arrangements of radiations below shows decreasing order of wavelengths?
A. X-rays> radio waves > infrared radiations B. Radio waves> infrared radiations > X-rays C. Infrared radiations > radio waves > X-rays D. X-rays> infrared radiations > radio waves Correct Answer: Option B = Radio waves> infrared radiations...
Which of the following curved surfaces will produce a real image? I. Concave mirror II. Convex mirror III. Diverging lens IV. Converging lens
A. I and III only B. I, II and IV only C. II, III and V only D. II and IV only Correct Answer: Option D = II and IV only Explanation Convex (converging) lenses can form either real or virtual images, whereas concave (diverging) lenses can form only virtual...
The sketched graph represents a progressive wave moving from the left to the right. The period the wave is 0.125s. Determine the values of the amplitude and wavelength, respectively, of the wave.
A. 8 cm; 27 cm B. 8 cm; 9 cm C. 4 cm; 9 cm D. 16 cm; 27 cm Correct Answer: Option B = 8 cm; 9 cmProducts
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