Jamb Physics 2004 Past Questions and Answers

Question 16:

• JAMB 2004

The instrument used for securing a large number of similar charges by induction is called

A. Electrophorus
B. Capacitor
C. Proof-plane
D. Electroscope

Question 17:

• JAMB 2004

If 16mA of current flows through a conductor in one second, the number of electron transported per seconds is
[1 electronic charge = 1.6 x 10^-19C]

A. 1.00 x 10²⁰
B. 2.56 x 10^-18
C. 2.56 x ^-17
D. 1.00 x 10¹⁷

Question 18:

• JAMB 2004

Electrical appliances at home are normally earthed so that

A. The appliances are maintained at a lower p.d than the earth
B. Both the a.c and d.c sources can be used
C. A person touching the appliances is safe from electric shock
D. The appliances are maintained at a higher p.d than the earth

Question 19:

• JAMB 2004

Given three capacitors 0.3μF, 0.5μF and 0.2μF, the joint capacitance when arranged to give minimum capacitance is

A. 0.1μF
B. 0.3μF
C. 1.0μF
D. 0.5μF

Question 20:

• JAMB 2004

The difference between X-rays and gamma rays is that

A. X-rays are more penetrating than gamma rays
B. X-rays are electromagnetic radiations while gamma rays are negatively charged radiation
C. X-rays have higher frequencies than gamma rays
D. X-rays arise from energy changes in the electronic structure of atoms while gamma rays come from the nucleus