5 volts
3.5 volts
2.5 volts
1 volts
10 volts
Correct answer is B
E.m.f. = I(R + r) = 0.5(2+5) = 3.5 volts
heating the bar to a high temperature
breaking the bar
connecting opposite poles with a small piece of iron
placing the bar inside a strong magnetic field
none of the above
Correct answer is A
No explanation has been provided for this answer.
What are the units of thermal conductivity?
kg.m.sec2
Joule sec-1m-1k-1
kg.m
Newton sec-1m2
m3
Correct answer is B
No explanation has been provided for this answer.
the cross-sectional area of the tube
the atmospheric pressure
the density of mercury
the temperature of mercury
the acceleration due to gravity
Correct answer is A
No explanation has been provided for this answer.
N5.70
N7.23
N3.65
N8.05
N4.50
Correct answer is A
Total power = (8 x 40) + (4 x 60) + (2 x 100)
= 760W
Energy(Kwhr) = power x time
= 760 x 10-3 x 150
= 114kwhr.
If, 1kwhr. cost 5k
thus, 114 kwhr. will cost 5 x 114
= N5.70