Jamb Physics 1999 Past Questions and Answers

Question 31:

• JAMB 1999

The core of an efficient transformer should consist of laminated pieces of metal in order to

A. Increase the heat produced by increasing the eddy current
B. Increase the heat produced by reducing the eddy current
C. Reduce the heat produced by increasing the eddy current
D. Reduce the heat produced by reducing the eddy current

Question 32:

• JAMB 1999

Gamma rays are produced when

A. High velocity electrons are abruptly stopped in metals
B. Energy changes occur within the nucleus of atoms
C. Energy changes occur within the electronic structure of atoms
D. Electrons are deflected in very strong magnetic fields

Question 33:

• JAMB 1999

What is the speed of a particle of mass 10^-27kg whose wavelength is 10^-8m.
[h = 6.63 x 10^-34Js]

A. 6.63ms^-1
B. 66.30ms^-1
C. 663.00ms^-1
D. 6630.00ms^-1

Question 34:

• JAMB 1999

in a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively, what is the voltage across the capacitor?

A. 30V
B. 40V
C. 50V
D. 70V

Question 35:

• JAMB 1999

In the Rutherford scattering experiment, a beam of alpha particles was fired at a thin gold film with some of the particles being considerably deflected. This shows that

A. A gold nucleus contains protons, neutrons and electrons uniformly distributed in a tiny volume
B. The gold nucleus is positively charged and is concentrated in a tiny volume
C. The gold nucleus emitted alpha particles
D. The gold nucleus is concentrated in a tiny volume and contains alpha particles