Waec Physics 2017 Past Questions and Answers

Question 46:

• WAEC 2017

The opposition offered to an alternating current in a C-R series circuit is known as

A. Impedance
B. Resistance
C. Reactance
D. Friction

Question 47:

• WAEC 2017

Which of the following pairs of concepts constitutes complementary variables as expressess by the Heinsberg uncertainty principle?

A. Momentum and time
B. Energy and acceleration
C. Position and momentum
D. Velocity and Momentum

Question 48:

• WAEC 2017

The nucleon number of an atom is the total number of

A. Electrons and protons
B. Electrons and neutrons
C. Neutrons minus electrons
D. Protons and neutrons

Question 49:

• WAEC 2017

n = \(\alpha\)	0.06eV
E=3	-1.6eV
E=2	-3.7eV
E=1	-5.5eV
E=0	-10.4eV

The energy levels in the mercury atom is illustrated in the table above. Calculate the ionisation energy of the atom.

A. +21.2eV
B. +10.4eV
C. -10.4eV
D. -21.2eV

Question 50:

• WAEC 2017

Which of the following statements about Gamma radiation is correct? Gamma radiation can

A. Be seen by the naked eye
B. Not pass through an aluminium foil
C. Be present naturally in our surroundings
D. Be used as a tracer