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All MCQs for Competitive Exams

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All MCQs for Competitive Exams

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1652 MCQs Page 8

Topic Notes: Competitive Exams

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Practice MCQs for CSS, PMS, FPSC, PPSC, NTS and Pakistan competitive exam preparation. Use topic-wise questions, answers, and explanations to revise quickly and improve exam accuracy.

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71
How does a very low resistance in an electrical circuit affect the magnitude of the current?
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72
Why are manganin or constantan alloys preferred for manufacturing standard wire-bound resistors?
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73
If the resistance of the conductor is doubled then the electric current is halved. What causes this:
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74
An electric heater draws 4 A of current when connected to a 60 V source. Calculate the current the heater will draw if the potential difference is increased to 172.5 V, assuming the resistance remains constant.
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75
An electric heater draws 4A of current at 60V. Calculate the current drawn if the potential difference is increased to 127.5V, assuming constant resistance.
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76
Which electrical instrument is specifically designed to measure potential difference between two points in a circuit?
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77
To which values of voltage and current does Ohm's law apply in an AC circuit?
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78
In which type of electrical circuit configuration does the current have only one path to follow?
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79
Calculate the equivalent resistance in ohms for a parallel circuit containing two resistors with values of 20 Ω and 30 Ω.
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80
In which electrical circuit configuration is the total equivalent resistance equal to the sum of the individual resistances?
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