Waec Physics 2015 Past Questions and Answers

Question 46:

• WAEC 2015

When current flows through a moving-coil galvanometer, the force exerted on the pointer depends on the: i. strength of the current. ii. magnetic field strength. iii. length of the coil. Which of the statement(s) above is/are correct?

A. I only
B. Ii only
C. I and iii only
D. I, ii and iii

Question 47:

• WAEC 2015

in a nuclear fission process, the mass defect was 1.2 x 10^-5kg. Calculate the energy released. [speed of the light in vacuum = c = 3.0 x 10⁸ms^-1]

A. 1.08 x 10¹¹J
B. 5.20 x 10¹¹J
C. 1.08 x 10¹²J
D. 2.50 x 10¹³J

Question 48:

• WAEC 2015

Which of the following statements about diode is correct?

A. Reverse bias diodes have low resistance
B. Forward bias diodes have high resistance
C. Forward bias diodes produce high current
D. Forward bias diodes function as a result of heat

Question 49:

• WAEC 2015

Which of the following radiations constitutes a stream of electrons?

A. Ramma rays
B. X-rays
C. Cathode rays
D. Radio waves

Question 50:

• WAEC 2015

\(^{226}_{88}Ra\) emits two alpha particles to produce polonium(po) nuclide. The correct formula for the nuclide?

A. \(^{224}_{86}po\)
B. \(^{222}_{86}po\)
C. \(^{222}_{84}po\)
D. \(^{218}_{84}po\)