241.
Which of the following statement about the electromagnet shown above is correct?
A.
when the current flows from A to B, the end A will be in north pole
B.
when the current flows from A to B, the end A will be south pole
C.
when the current flows from A to B, the end B will be south pole
D.
none of the above
Correct answer is B
A - B = S - N.
Also, starting end of the current is south while terminating end is North.
243.
Radio waves belongs to the class of waves whose velocity is about
A.
340m/s
B.
3 × 106 m/s
C.
3 × 108 m/s
D.
3 × 10−8 m/s
Correct answer is C
3 × 108 m/s
245.
One newton × One meter equals?
A.
One water
B.
One Joule
C.
One ampere
D.
One kilogram
Correct answer is B
1N × 1m = 1Nm = 1 Joul (F × d = Work/Energy)
JAMB Subjects
Aptitude Tests