TMA

TMA1/PHY102 – Electricity, Magnetism and Modern Physics

TMA Quiz Questions

TMA: TMA1/PHY102
PHY102 – Electricity, Magnetism and Modern Physics
Mr. Ibanga Efiong (eibanga@noun.edu.ng )

 
1 When amber is rubbed with fur

A. amber is positively charged while fur is negatively charged
B. amber is negatively charged while fur is positively charged  
C. amber is positively charged while fur is neutral
D. amber is negatively charged while fur is neutral

2 Two charges
Q1=500μC
Q1=500μC
and
Q2=100μC
Q2=100μC
are located on the XY plane at the positions
r1=3j⃗
r1=3j→
m and
r2=4i⃗
r2=4i→
m . Find the force exerted on the
Q2
Q2

A. 14.4i⃗ +10.8j⃗
14.4i→+10.8j→
N

B. 14.4i⃗ –10.8j⃗       
14.4i→–10.8j→
N

C. 10.8i⃗ –14.4j⃗
10.8i→–14.4j→
N

D. 10.8i⃗ +14.4j⃗
10.8i→+14.4j→
N

3 A huge spark due to electric discharge in the atmosphere produces all of the following except

A. Lightning
B. Rapid expansion of surrounding air
C. shock waves
D. gamma radiation.  

4 Which of the following is not true of an electrostatic force?

A. it acts along the line joining the point charges
B. it obeys an inverse square law
C. it is mutually attractive or repulsive
D. it is weaker than the gravitational attraction between the charged particles.  

5 A tiny ball of mass 0.60 g is suspended from a rigid support with a piece of thread in a horizontal electric field of intensity 700 N/C. The ball is in equilibrium when the thread is inclined at an angle of
20o
20o
to the vertical. What are the magnitude and sign of the charge on the ball? Take
g=9.8m/s2
g=9.8m/s2

A. −3.1×10−6C  
−3.1×10−6C

B. 3.2×10−6C
3.2×10−6C

C. 4.2×10−6C
4.2×10−6C

D. −4.1×10−3
−4.1×10−3

6 The following are true about electric field lines except that they

A. are drawn such that the magnitude of the field is proportional to the number of lines crossing a unit area perpendicular to the lines
B. do not intersect one another
C. are discontinuous and may terminate in a vacuum  
D. give the direction of motion of a unit positive test-charge under the action of the electrostatic force

7 What are the dimensions of the constant k in Coulomb’s law of electrostatics?

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A. ML2T−4T−2A−1
ML2T−4T−2A−1

B. ML2T3A−2
ML2T3A−2

C. M−2L3T2A−1
M−2L3T2A−1

D. ML3T−4A−2  
ML3T−4A−2

8 Which of the following can be used to charge a metal rod that is held in your hand? Rub it with

A. fur
B. silk
C. wool
D. It cannot be done  

9 Which of the following is a conductor

A. plastic
B. copper  
C. glass
D. silk

10 Charges of
+2
+2
and
−2C
−2C
are situated at points P and Q respectively which are at a distance apart. A point X is mid-way between P and Q. Which of the following correctly describes the electric field and the electric potential at point X?

A. electric field is toward Q, electric potential is zero  
B. electric field is toward Q, electric potential is negative
C. electric field is toward P, electric potential zero
D. electric field is toward P, electric potential is positive

11 From Gauss’ law which of the following is NOT correct?

A. The outward flux of electric field through an enclosed surface is proportional to the electric charges enclosed
B. The field at a point outside a spherically symmetric charge is the same as C. the electric field at the same point due to a point charge at its centre.
C. The electric flux through a Gaussian surface is a vector product of the electric field and a unit vector perpendicular to and outward from the surface  
D. The total electric flux through a cylinder placed in an electric field with its axis parallel to the field is zero

12 Which of the following is not true about the electric field intensity
E⃗
E→
of a uniformly charged solid sphere?

A.                   E⃗
E→
is maximum at the surface of the sphere

B.               E⃗
E→
is directly proportional to the distance from the centre of the sphere

C.               E⃗
E→
decreases as a square of the distance from the surface of the sphere

D.                E⃗      
E→
decreases as a square of the distance from the centre of the sphere.

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13 1 volt is equal to

A. 1 watt/C
B. 1 J/s C
C. 1 J/C  
D. 1 N/C

14 The electric potential difference between two points A and B is 42 V. What is the work done by an external agent in carrying a charge of
5.0×10−5C
5.0×10−5C
from A to B at constant speed?

A. 2.1×10−3J  
2.1×10−3J

B. 8.4×10−4J
8.4×10−4J

C. 21×10−4J
21×10−4J

D. 8.4×10−3J
8.4×10−3J

15 A uniform electric field of 200 N/C is in the x-direction. A point charge of
3μC
3μC
is released from rest at the origin. What is the kinetic energy of the charge when it is at x = 4 m?

A. 2.4×10−2J  
2.4×10−2J

B. 1.6×10−2J
1.6×10−2J

C. 3.6×10−2J
3.6×10−2J

D. 4.8×10−2J
4.8×10−2J

16 The term ‘lost volts’ refers to ———–

A. energy per coulomb dissipated in the external (load) resistance
B. terminal potential difference
C. energy per coulomb dissipated in the internal resistance of the source of emf  
D. energy per coulomb wasted to heat up the connecting wires

17 Kirchhof’s junction rule is statement of conservation of ———–

A. mass
B. energy
C. charge  
D. momentum

18 A galvanometer of resistance
120Ω
120Ω
a full scale deflection with a current of 0.0005A. How would you convert it to an ammeter that reads a maximum current of 5A?

A. connect
2000Ω
2000Ω
in parallel to it
B. connect
200.12Ω
200.12Ω
in series to it
C. connect
20.10Ω
20.10Ω
in series to it
D. connect  
0.012Ω
0.012Ω
in parallel to it

19 Kirchhof’s loop rule is statement of conservation of ———–

A. mass
B. energy  
C. charge
D. momentum

20 In the space surrounding a wire carrying a steady current, there exists

A. a magnetic field pointing radially outward
B. a magnetic field circling the wire  
C. an oscillating magnatic field
D. no magnatic field

 

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