Jamb Physics 2008 Past Questions and Answers

Question 46:

• JAMB 2008

If a convex lens of focal length 12cm is used to produce a real image four times the size of the object, how far from the lens must the object be placed?

A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm

Question 47:

• JAMB 2008

Find the effective resistance in the diagram above

A. 6 Ω
B. 12 Ω
C. 18 Ω
D. 24 Ω

Question 48:

• JAMB 2008

Given the inductor of inductance 5mH, 10mH and 20mH connected in series, the effective inductance is

A. 0.35mH
B. 3.50mH
C. 2.90mH
D. 35.0mH

Question 49:

• JAMB 2008

If electron are accelerated from rest through a potential difference of 10kv, what is the wavelength of the associated electron
[m = 9.1 x 10^-31kg, e = 1.6 x 10^-19C, h = 6.6 x 10^-34js]

A. 1.22 x 10^-11m
B. 3.87 x 10^-10m
C. 2.27 x 10¹¹m
D. 2.27 x 10¹⁴m

Question 50:

• JAMB 2008

N + He → O + X

14	4	17
7	2	8

In the equation above, the particles X is

A. A proton
B. A neutron
C. An α - particle
D. A β - particle