Question 4361:

• NECO 2000

Which of the following is NOT part of an a.c generator?

A. Commutator
B. Armature
C. Field magnet
D. Carbon brushes
E. Slip rings

Question 4362:

• NECO 2000

In a simple pendulum experiment, a boy observed that the times for 30 oscillations are 70.0s, 72.0s and 67.0s respectively. Calculate the mean period of oscillation of the pendulum.

A. 0.14s
B. 0.43s
C. 2.32s
D. 2.40s
E. 6.97s

Question 4363:

• NECO 2000

The clinical thermometer differs from other mercury-in-glass thermometers because it has

I. a constriction
II. a wide range
III. a short range
IV. a narrow bore.

Which of the above are correct?

A. I and II only
B. I and III only
C. III and IV only
D. I,II and III only
E. I, III and IV only

Question 4364:

• NECO 2000

If a positively charged glass-rod is used to charge an electroscope X by contact and an electroscope Y by induction, then

A. X and Y will be negatively charge
B. X and Y will be positively charged
C. X will be negatively charged and Y positively charged
D. X will be positively charged and Y negatively charged
E. X will be positively charged and Y will remain uncharged

Question 4365:

• NECO 2000

A wave travels a distance of 20 cm in 3s. The distance between successive crests of the wave is 4cm. What is the frequency of the wave?

A. 0.60Hz
B. 1.67Hz
C. 7.50Hz
D. 15.00Hz
E. 26.67Hz