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| 2nd-year physics Solved MCQs All Chapters || 12th Class Physics Solved MCQs with answers || 2nd year Chapter 13 (Current Electricity) solved MCQs with answers |
a) Decreases
b) Increases
c) Remains the same
d) No effect
Answer: A
2- A constant current of 1 Ampere flows in an electrical component over a period of 5 seconds. The total charge flowing through the component over this duration is? (UET 2016)
a) 5 Ampere
b) 10 Ampere
c) 15 Ampere
d) 20 Ampere
Answer: A
3- If a resistor having resistance "R" is cut into three equal parts, then the equivalent of a parallel combination is? (UHS 2015)
a) 9/R
b) 3/R
c) R/9
d) R/3
Answer: C
4- Which combination of seven identical resistors each of 2 ohms gives rise to the resultant of 10/11 ohm? (UHS 2015)
a) 5 parallel, 2 series
b) 4 parallel, 3 series
c) 3 parallel, 4 series
d) 2 parallel, 5 series
Answer: D
5- A battery made a charge of 40 C around a circuit at a constant rate in the 20s. The current will be:
a) 2 A
b) 0.5 A
c) 80 A
d) 60 A
Answer: A
6- Heat generated by a 40W bulb in one hour is:
a) 140 J
b) 1440 J
c) 14400 J
d) 144000 J
Answer: D
7- The potential difference between, the head and the tail of an electric eel are:
a) 600 v
b) 700 v
c) 800 v
d) 900 v
Answer: A
8- If the temperature of a conductor is increased, the product of resistivity and conductivity:
a) Increases
b) Decreases
c) Remains constant
d) May increase or decrease
Answer: C
9- For a closed circuit:
a) E=Vt
b) E>Vt
c) E<Vt
d) E= Vt-Ir
Answer: B
10- emf is induced to change in:
a) Charge
b) Current
c) Magnetic Flux
d) Electric field
Answer: C
11- In carbon resistors, what is the value of violet color?
a) 6
b) 7
c) 8
d) 9
Answer: B
12- The color code of yellow color is:
a) 2
b) 3
c) 4
d) 5
Answer: C
13- Resistance tolerance for gold color is:
a) 50%
b) 5%
c) 40%
d) 35%
Answer: B
14- The substance having a negative temperature of a coefficient is:
a) Carbon
b) Iron
c) Tungsten
d) Gold
Answer: A
15- Heat generated by a 50-watt bulb in one hour is:
a) 36000 J
b) 48000 J
c) 18000 J
d) 180000 J
Answer: C
16- Conventional current is shown by the direction of:
a) Positive charges
b) Negative charges
c) Electrons
d) Neutrons
Answer: A
17- A charge of 72C passes through a wire in 1 hour. What is current in wire? (MDCAT)
a) 0.01 A
b) 3.6 mA
c) 0.02 A
d) 7.2 mA
Answer: C
18- In which combination of resistors the value of equivalent resistance is less than the value of any individual resistor in the circuit:
a) Parallel
b) Series
c) Both parallel and series
d) None
Answer: A
19- Which of the following do not obey Ohm's law?
a) Diodes
b) Transistors
c) Azoetropes
d) All of these
Answer: D
20- Current density in a wire of radius 0.01m of a circuit is found to be 0.02 A/m. What is the current in the wire?
a) 0.0006 A
b) 0.0005 A
c) 0.0003 A
d) 0.0002 A
Answer: A
21- If two resistors A and B are connected in series with a battery such that the resistance of A is greater than B, then which of both the resistors will be heated more due to current?
a) A
b) B
c) Both transmit the same amount of heat
d) None
Answer: B
22- Which of the following is not a source of current?
a) Cell
b) Capacitor
c) Solar Cells
d) None
Answer: B
23- For open circuit:
a) EMF>V
b) EMF<V
c) EMF=V
d) None of the above
Answer: C
24- For short circuits:
a) EMF>V
b) EMF<V
c) EMF=V
d) None of the above
Answer: A
25- High negative temperature coefficient thermistors are very accurate for measuring low temperature near:
a) 15 K
b) 20 K
c) 10 k
d) 15 KJ
Answer: C
26- Which type of temperature coefficient of resistance in thermistors?
a) Negative
b) Positive
c) Neutral
d) Positive and negative
Answer: D
27- Rheostat can be used as a:
a) Potential divider
b) Variable resistor
c) Both A and B
d) None
Answer: C
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