Question 281:

• JAMB 1983

If the force of a charge of 0.2 coulomb in an electric field is 4N, then the electric field intensity of the field is

A. 0.8
B. 0.8N/C
C. 20.0N/C
D. 4.2N/C
E. 20.0N/C

Question 282:

• JAMB 1983

The specific latent heat of vaporization of a substance is always

A. Less than its specific latent heat of fusion
B. Greater than its specific heat of fusion
C. Equal to its specific latent heat of fusion
D. All of the above depending on the nature of the substance
E. None of the above

Question 283:

• JAMB 1983

Longitudinal waves do not exhibit

A. Refraction
B. Reflection
C. Diffraction
D. Polarization
E. Rarefaction

Question 284:

• JAMB 1983

Which of the following may be used to determine the relative humidity in a physics laboratory
I. Manometer
II. Wet-and-Dry Bulb Hygrometer
III. Hair Hygrometer
IV. A Hydrometer

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

Question 285:

• JAMB 1983

PQ is a thin rod on a horizontal table, RS is a plane mirror inclined at \( 45^{\circ}C\) to the horizontal as shown above. The image of PQ as seen in the mirror by the eye T is

A. Horizontal
B. Parallel to the mirror
C. At infinity
D. Vertical
E. Highly magnified