HSSC-II (Class-12) Solved Physics MCQs; Unit-12: Current Electricity; (New Book/KPK Text Board, Peshawar) With Verified Answers

1. Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

A. 3 R Ω
B. `\frac {2R}{4}`Ω
C. `\frac {R}{3}`Ω
D. `\frac {2R}{3}`Ω

... Answer is B. `\frac {2R}{4}`Ω
--------------------------

2. When n resistances each of value r are connected in parallel, then the resultant resistance is x. When these n resistances are connected in series, the total resistance is

A. nx
B. rnx
C. x/n
D. n²x

... Answer is D. n²x
----------------------

3. Two bulbs marked 200 watt - 250 volts and 100 watt - 250 volts are joined in series to 250 volts supply. The power consumed in the circuit is

A. 33 watt
B. 67 watt
C. 100 watt
D. 300 watt

... Answer is B. 67 watt
---------------------------

4. Resistance of a wire is r ohms. The wire is stretched to double its length, then its resistance in ohms is

A. r/2
B. 4r
C. 2r
D. r/4

... Answer is B. 4r
-------------------------

5. 10⁶  electrons are moving through a wire per second, the current developed is

A. 1.6 ｘ 10⁻¹⁹ A
B. 1 A
C. 1.6 ｘ 10⁻¹³ A
D. 10⁶ A

... Answer is C. 1.6 ｘ 10⁻¹³ A
------------------------

6. A proton is about 1840 times heavier than an electron. When accelerated by a potential difference if 1 kV, its kinetic energy will be:

A. 16R
B. 4R
C. 2R
D. 0

... Answer is A. 16R
------------------------------

7. How much voltage is required to make 2A flow through a resistance of 8 Ω?

A. 16 A Ω⁻¹
B. 16 Ω A⁻¹
C. 16 A Ω
D. 16 A⁻¹Ω⁻¹

... Answer is C. 16 A Ω
--------------------------

8. A wire of uniform cross-section A, length L, and resistance R is cut into two equal parts. The resistivity of each part will be

A. doubled
B. halved
C. remains the same
D. one fourth

... Answer is C. remains the same
-------------------------

9. The resistivity of two wires is 𝝆₁ and 𝝆₂ which are connected in series. If their dimensions are the same then the equivalent resistivity of the combination will be

A. (ρ₁ + ρ₂)
B. `\frac {1}{ρ₁}` + `\frac {1}{ρ₂}`
C. `\frac {ρ₁ + ρ₂}{2}`
D. `\frac {ρ₁}{ρ₂}`

... Answer is C. `\frac {ρ₁ + ρ₂}{2}`
------------------------

10. The powers of two electric bulbs are 100 w and 200 w. Which are connected to the power supply of 220 V. The ratio of the resistance of their filament will be

A. 1:2
B. 2:1
C. 1:3
D. 4:3

... Answer is B. 2:1
----------------------

11. Thermocouple is an arrangement of two different metals that is

A. To convert heat energy into electrical energy
B. To produce more heat
C. To convert heat energy into chemical energy
D. To convert electric energy into heat energy

... Answer is A. To convert heat energy into electrical energy
------------------------------

12. In order to achieve high accuracy, the slide wire of a potentiometer should be

A. As long as possible
B. As short as possible
C. Very thin
D. Very thick

... Answer is A. As long as possible
-------------------------

13. When a potentiometer is used for the measurement of the voltage of an unknown source, the power consumed in the circuit of the unknown source under null conditions is

A. high.
B. small.
C. ideally zero.
D. very high.

... Answer is C. ideally zero.
-------------------------

14.  In a Wheatstone bridge method, the bridge is said to be balanced, when the current through the galvanometer is

A. 1 A
B. 0 A
C. Maximum
D. Half of the maximum value

... Answer is B. 0 A
----------------------------

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