N280.00
N28.00
N7.20
N1.44
Correct answer is B
P = (80 x 5 + 100 x 3)8
= 5600W
Cost = \(\frac{5600}{1000} \times 5 = N28\)
A bulb marked 240V, 40W is used for 30 minutes. Calculate the heat generated
320J
400J
10800J
72000J
Correct answer is D
W = P x t
= 40 x 30 x 60
= 72000J
Which of the following operations does not represent an action of a force field?
falling of a mango fruit from the tree
picking of nails using a bar magnet
repulsion of two like charges
pushing of a wheel-barrow on a level gound
Correct answer is D
No explanation has been provided for this answer.
Which of the following components is used for storing electric charges?
inductor
resistor
capacitor
electrometer
Correct answer is C
No explanation has been provided for this answer.
Which of the following statements is correct about resonance? Resonance occurs when a body
vibrates with its natural frequency
is forced to vibrate on its own natural frequency by another body at the same vibration
vibrates at the frquency of the body causing the vibration
vibrates with an irregular frequency
Correct answer is C
No explanation has been provided for this answer.