KPTCL Exam Numerical Ability Ratio and Proportion

What is the percentage error when 3 resistors with ratings 100 Ω at 5%, 150 Ω at 6% and
250 Ω at 8% respectively, are connected in series?

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KPTCL Other Question
Consider a cube of material of sides 1 cm with a resistance of 0.003 Ω between its opposite
faces. What is the resistance if the same volume of the material is drawn into a length of 50
cm with a uniform cross – section?
A) 0.003 Ω B) 0.15 Ω
C) 7.5 Ω D) None of these
 Animesh Dagga inaugurates his internet cafe on the 1st
of January 2003. He invests in 10 computers @ Rs. 30,000
per computer. Besides, he also invests in the other
infrastructure of the centre, a sum of Rs.1 lakh only. He
charges his customers on the time spent on the internet a
flat rate of Rs.50 per hour. His initial investment on
computers has to be written off equally in 3 years (1 lakh per
year) and the infrastructure has to be written off in 5 years
(@ Rs. 20,000 per year). He has to pay a fixed rental of
Rs.8000 per month for the space and also hires an assistant
at Rs.2000 per month. For every hour that he is connected
to the internet, he has to bear a telephone charge of Rs.20
irrespective of the number of machines operational on the
internet at that time. On top of this, he also has to pay an
electricity charge of Rs.5 per computer per hour. Assume
that there are no other costs involved unless otherwise
mentioned. The internet cafe is open 12 hours a day and is
open on all 7 days of the week. (Assume that if a machine is
not occupied, it is put off and hence consumes no electricity).
Assuming a uniform 80% occupancy rate for the month of
April 2003, find his profit or loss for the month