(C) Sea water
(D) Drinking water
General Physics II (PHY121) Test
Instructions: Answer all questions, write your
answers in the box provided and submit this paper
immediately after the test.
Kindly write your matric details and sign the
attendance sheet very important!
Time:40minutes
Coulomb force constant K= 8.99
Permissively of a free space = 8.85
MATRIC NUMBER:
Questions
6. The efficiency of a cell with internal resistance
of 2Ω supply current to a 6Ω resistor is
(A) 25%
(B) 50%
(C) 65%
(D) 75%
⁄
⁄
−9
1. A charge of 4.5 × 10 C is located 3.2m from a
−9
charge of −2.8 × 10 C. Find the electrostatic force
exerted by one charge on another.
(A) 1.11
N
(B) 4.11
N
(C) 2.41
N
(D) 1.33
N
2. Oppositely charged plates are separated by
5.33mm. A potential difference of 600V exists
between the plates. What is the magnitude of the
electric field between the plates?
(A)1.13
V/m
(B) 2.13
V/m
(C) 4.13
V/m
(D) 1.13
V/m
7. A uniformly charged conducting sphere of 4.2m
diameter has a surface charge density of
2
100.0μC/ . Find the charge on the sphere and
what is the total electric flux leaving the surface of
the sphere?
-1
2
(A) 6.54
C, 7.25
-1
2
(B) 2.54
C, 7.25
-1
2
(C) 5.54
C, 6.25
-1
2
(D) 10.54
C, 7.25
8. Find the equivalent resistor and the current that
flows through the circuit
−5
3. What voltage is required to store 7.2 × 10 C of
charge on the plates of a 6.0μF capacitor?
(A) 14v
(B) 12v
(C) 15v
(D) 20v
4. An air–filled capacitor consists of two parallel
2
plates, each with an area of 7.60 cm and
separated by a distance of 1.80mm. If a 20.0-V
potential difference is applied to these plates,
calculate the electric field between the plates and
the capacitance,
(A) 3.11
V/m, 3.84pF
(B) 1.11
V/m, 3.74pF
(C) 1.44
V/m, 4.74pF
(D) 5.11
v/m, 5.74Pf
5. Which of the following liquid is a poor conductor
of electricity?
(A) Anchor University Pure water
(B) Tap water
(A)120 , 0.2A
(B) 200 , 0.4A
(C) 100 , 0.2A
(D) 150 , 0.2A
9. When an electric dipole is placed on uniform
electric field is acted upon by ----(A) Dipole dipole
(B) Electric force
(C) Torque
(D) dipole moment
10. Calculate the resistance per unit length of a 22gauge Nichrome wire of radius 0.421mm, if a
potential different of 30V is maintained across a
1.00m length of the Nichrome wire, what is the
-6
current in the wire? (𝜌 = 1.5×10 Ω. )
(A) 2.69
, 11.15A
(B) 2.69
, 11.15A
(C) 2.69
, 11.15A
(D) 2.69
, 11.15A
11. A 5 Ω resistor carries 2 A. Power loss is:
(A) 10 W
(B) 20 W
(C) 25 W
(D)100W
12. Resistivity depends on:
(A) Material
(B) Length
(C) Voltage
(D) Current
13. A fuse is used in a circuit to:
(A) Power a bulb
(B) Protect from overcurrent
(C) Reduce voltage
(D) Increase resistance
14. The angle between magnetic field and velocity
for max force is:
(A) 90°
(B) 45°
(C) 0°
(D) 180°
15. In a closed loop, the algebraic sum of voltages
is:
(A) Zero
(B) Equal to EMF
(C) Maximum
(D) Infinite
16. The potential difference between two points in
an electric field is 12 V. If a charge of 2 C moves
between them, the work done is:
(A) 24 J
(B) 6 J
(C) 12 J
(D) 144 J
17. The capacitance of a capacitor depends on:
(A) Distance between plates
(B) Area of plates
(C) Dielectric material
(D) All of the above
18. If a capacitor is charged and then disconnected
from the battery, what happens when a dielectric
is inserted?
(A) Voltage increases
(B) Voltage decreases
(C) Charge decreases
(D) Energy increases
19. The electric potential due to a point charge at a
distance r is proportional to:
(A) 1/r
(B) 1/r²
(C) r
(D) r²
20. The direction of electric field is:
(A) From negative to positive
(B) Circular
(C) Tangential
(D) From positive to negative