Question 256:

• JAMB 1983

Which of the following statements about defects of vision is/are CORRECT? i. for a long sighted person, close objects appear blurred. ii. for a short sighted person, distant objects appear blurred. iii. short sight is corrected by using a pair of converging lenses.

A. I only
B. Ii only
C. I and ii only
D. Ii and iii only
E. I, ii and iii

Question 257:

• JAMB 1983

The range of wavelengths of the visible spectrum is 400nm - 700nm. The wavelength of gamma rays is

A. Longer than 700nm
B. Shorter than 700nm but longer then 400nm
C. 550nm
D. Shorter than 400nm
E. Infinite

Question 258:

• JAMB 1983

If the pressure on 100cm³ of an ideal gas is doubled while its kelvin temperature is halved, then the new volume of the gas will become

A. 25cm³
B. 50cm³
C. 100cm³
D. 200cm³
E. 400cm³

Question 259:

• JAMB 1983

A train has an initial velocity of 44ms^-1 and an acceleration of -4ms^-1. Its velocity after 10 seconds is

A. 2ms^-1
B. 4ms^-1
C. 8ms^-1
D. 12ms^-1
E. 16ms^-1

Question 260:

• JAMB 1983

Which of the following conditions are necessary and sufficient for total internal reflection to take place at the boundary between two optical media? i. light is passing from optically denser medium to optically less dense medium. ii. light is passing from optically less dense medium to optically denser medium. iii. angle of incidence is greater. iv. angle of incidence is lesser

A. I and ii only
B. Ii and iii only
C. Ii and iv only
D. I and iii only
E. Ii and iv only