2001 - WAEC Physics Past Questions and Answers - page 5
41
In the circuit diagram above. Calculate the energy stored in the inductor at resonance
A
0.100J
B
0.050J
C
0.010J
D
0.005J
correct option: b
Users' Answers & Comments42
Calculate the reactance of the inductor in the circuit diagram shown above [\(\pi = \frac{22}{7}\)]
A
132\(\Omega\)
B
214\(\Omega\)
C
264\(\Omega\)
D
269\(\Omega\)
correct option: c
\(X_L = 2 \pi fL = 2 \times \pi \times 60 \times 0.7 = 264\Omega \)
Users' Answers & Comments43
Production of x-ray tube begins with
A
photo electric emission
B
collision of electrons
C
thermionic emission
D
field emission of electrons
correct option: d
Users' Answers & Comments44
A nitrogen nucleus bombarded with an alpha particle produces an oxygen nucleus and a proton. The nuclear reaction for this process is \(^4_2H + ^{14}_2N \to ^{17}_{8}O + ^1_1H + Q\). Which of the following statements about the reaction is not correct?
A
the bombardment results into a nucleus with greater proton number
B
it is an induced nuclear reaction
C
it is a natural radioactive decay
D
the sum of the final nucleon numbers
correct option: b
Users' Answers & Comments45
Electrons passing through crystals are diffracted because they
A
are repelled by the atoms in the crystal
B
are attracted by the atoms in the crystals
C
possess wave properties
D
are particles
correct option: c
Users' Answers & Comments