A wire of 5Ω resistance is drawn out so that its new length is two times the original length. If the resistivity of the wire remains the same and the cross-sectional area is halved, the new resistance is?
A. 40Ω B. 20Ω C. 10Ω D. 5Ω Correct Answer: Option B – 20Ω
The operation of an optical fibre is based on the principal of?
A. dispersion of light B. interference of light C. refraction of light D. polarization of light Correct Answer: Option C – refraction of light
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...Products
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