Jamb Physics 2000 Past Questions and Answers

Question 21:

• JAMB 2000

If a charged ion goes through combined electric and magnetic fields, the resultant emergent velocity of the ion is

A. E/B
B. EB
C. B/E
D. E - B

Question 22:

• JAMB 2000

A projection lantern is used to give the image of a slide on a screen. If the image is 24 times as large as the slide and the screen is 72.0m from the projecting lens, what is the position of the slide from the lens?

A. 0.3m
B. 3.0m
C. 3.5m
D. 4.0m

Question 23:

• JAMB 2000

An electron of charge 1.6 x 10^-19C and mass 9.1 x 10^-31kg is accelerated between two metal plates with a velocity of 4 x 10⁷ms^-1, the potential difference between the plates is

A. 4.55 x 10³V
B. 4.55 x 10²V
C. 9.10 x 10¹V
D. 4.55 x 10¹V

Question 24:

• JAMB 2000

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

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

Question 25:

• JAMB 2000

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