Jamb Physics 2012 Past Questions and Answers

Question 61:

• JAMB 2012

A cell of internal resistance 0.01Ω can be measured accurately using the

A. Ohm meter
B. Metre bridge
C. Potentiometer
D. Electroscope

Question 62:

• JAMB 2012

What optical instrument can best be constructed with converging lenses of focal lengths 50cm and 5cm?

A. Compound microscope
B. Galileo's telescope
C. Terrestrial telescope
D. Astronomical telescope

Question 63:

• JAMB 2012

in a pure semiconductor, the number of electrons in the conduction band is

A. Less than the number of holes in the valence band
B. Equal to the number of holes in the valence band
C. Greater than the number of holes in the valence band
D. Twice the number of holes in the valence band

Question 64:

• JAMB 2012

In a thermonuclear reaction, the total initial mass is 5.02 x \(10^{-{2}{7}}\)kg and the total final mass is 5.01 x \(10^{-{2}{7}}\)kg. The energy released in the process is
[c = 3.0 x \(10^8\) ms-1]

A. 9.0 x 10^-13J
B. 9.0 x 10^-12J
C. 9.0 x 10^-11J
D. 9.0 x 10^-10J

Question 65:

• JAMB 2012

A gas would serve as an electrical conductor under

A. Reduced pressure and high current
B. Increased magnetic field
C. Reduced pressure and reduced potential
D. Exposure to visible light