Question 101:

• JAMB 1979

Fig 8 shows a current I flowing in a copper wire situated in a magnetic field existing between the pole-pieces of a horse-shoe magnet.
Which of the following statements is correct?

A. The wire will experience a force in the direction into the paper
B. The wire will experience a force in the direction out of the paper
C. The wire will vibrate in a direction into and out of the paper
D. The wire will move in the direction of the field i.e toward the s-pole
E. The wire will not move because it is made of copper which is non magnetic

Question 102:

• JAMB 1979

For the wave motion represented above
The wavelength is given by

A. P
B. Q
C. R
D. S
E. T

Question 103:

• JAMB 1979

fig 10 shows a see-saw which is perfectly in balance, the weighs of the people sitting on it are 50kg, xkg and 15kg as shown, the sit at distances of 1.5, 1.5 and 2m from the pivot respectively. The vale of X is

A. 30
B. 35
C. 70
D. 24.25
E. Impossible to find

Question 104:

• JAMB 1979

An electrical circuit is connected up as shown above, which of the following is correct about the value of current flowing through the 1 ohm resistance?

A. 12/13A
B. 13/12A
C. 1/3A
D. 3A
E. 12/7A

Question 105:

• JAMB 1980

Which of the following statements are true of the law of universal gravitation?

A. Any two bodies attract each other with a force which is proportional to the difference of their masses
B. Any two bodies attract each other with a force which is inversely proportional to the square of the distance between them
C. Any two bodies attract each other with a force which is proportional to the product of their masses and inversely proportional to the square of the distance between them
D. Any two bodies attract each other with a force which is proportional to the square of the distance between them
E. Any two bodies attract each other with a force which is proportional to the sum of their masses