A resistance R is connected across the terminal of an electric cell of internal resistance 2Ω and the voltage was reduced to 3/5 of its nominal value. The value of R is?
A. 3 Ω B. 2 Ω C. 1 Ω D. 6 Ω Correct Answer: Option A – 3 Ω Explanation 1 = V/R = E/R+r , if r = 2Ω V = 3/5 E => 3E/5R = E/R+2 i.e 3E(R+2) = 5RE 3RE + 6E = 5RE i.e 3R + 6 = 5R 6 = 5R – 3R => 2r = 6 i.e R = 6/2 =...
A cell of internal resistance r supplies current to a 6.0Ω resistor and its efficiency is 75%. Find the value of r.
A. 4.5Ω B. 1.0Ω C. 8.0Ω D. 2.0Ω Correct Answer: Option D = 2.0Ω Explanation Efficiency = power out put/power input x 100/1 = power out put/ power + that due x 100/1 to internal resistance => 75/1 = 12R x 100/1 12(R+r) i.e 75/100 = 6/6+r => 75 (6+r) = 100/6 i.e...A gas with initial volume of 2 X 10^-6 m³ is allowed to expand to six times its initial value at constant pressure of 2 x 10^5Nm−². The work done is?
A. 2.0J B. 4. 0J C. 12.0J D. 2.4J Correct Answer: Option D = 2.4J Explanation P = F/A => F = PA = PV/L W = FD = (PV/L) x L = PV = 2 x 105 (2 x 10-6 x 6) = 2 x 105 x 1.2 x 10-5 = 2.4...
A string is fastened tightly between two walls 24cm apart. The wavelength of the second overtone is?
A. 24cm B. 16cm C. 12cm D. 8cm Correct Answer: Option B – 16cm Explanation For a string fixed at both ends and plucked at the middle, the fundamental frequency is given by f0 = v/λ, where v = velocity of sound, λ = wave length. At its fundamental, note, the the...Products
-
Download Business Administration Project Topic PDF - Effects of Job Stress on Employee’s Performance in Evans Nigeria
Original price was: ₦600.00.₦300.00Current price is: ₦300.00.
-
Download Accountancy Project Topic PDF - Effect Of Cost Control On The Profit Of An Organization (A Case Study Viju Milk Industries Nigeria Limited)
Original price was: ₦600.00.₦400.00Current price is: ₦400.00.
-
Download Animal Production Journal Article PDF - Performance of Some Forage Rass Species in the Southern Guinea Savannah Agro-Ecological Zone in Nasarawa State of Nigeria
Original price was: ₦600.00.₦300.00Current price is: ₦300.00.
-
Download Conference Paper Article PDF - Video Summarization Based Handout Generation from Video Lectures: A Gesture Recognition Framework
Original price was: ₦600.00.₦300.00Current price is: ₦300.00.
-
Download Conference on Advanced Computer Theory Article PDF - Real-Time Mono Vision Gesture-Based Virtual Keyboard System
Original price was: ₦600.00.₦300.00Current price is: ₦300.00.