Jamb Physics 1980 Past Questions and Answers

Question 16:

• JAMB 1980

The name given to the characteristics behaviour of substances which set their length perpendicular to a strong magnetic field instead of in line with it is

A. Magnetization
B. Paramagnetism
C. Diamagnetism
D. Demagnetization
E. Ferromagnetism

Question 17:

• JAMB 1980

Which of the following statements on the use of X-rays is incorrect? X-rays are used

A. In hospitals to obtain photogaphs of tissues and bones in the body
B. For the treatment of malignant growths like cancer cells
C. In detecting fingerprints
D. To reveal hidden flaws in metal castings and welded joints
E. To detect alternations which have been made to works of art

Question 18:

• JAMB 1980

What is the relative permitivity of a capacitor if its capacitance with a medium as dielectric is 16 farads and its capacitance with vacuum as dielectric is 2 farads?

A. O
B. \(\frac{1}{2}\)
C. 2
D. 8
E. 32

Question 19:

• JAMB 1980

If the magnification of a virtual image formed of an object 10cm from a convex lens is 3, then the focal length of the lens is

A. 10cm
B. 15cm
C. 16cm
D. 19cm
E. 20cm

Question 20:

• JAMB 1980

A quantity of sungas at -133^{[/sup] occupies 1/3m[sup]3} under pressure 1.4 x 10⁵ Nm^-2. if the gas occupies 31 m^-2 at 37^oC, its pressure will be

A. 1.26 x 10³Nm^-2
B. 3.3 x10⁴Nm^-2
C. 1.35 x 10⁴Nm^-2
D. 2.2 x 10⁴Nm^-2
E. 10⁵Nm^-2