BPSC CCE Prelims
Current Electricity Previous Year Questions (PYQs)
Practice solved questions for Current Electricity with detailed step-by-step solutions, key insights, and trend analysis for BPSC CCE PRELIMS.
Solved Previous Year Questions
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Which term in the following does not denote the electric power în electric circuit?
Detailed Explanation:
Electric power in a circuit is given by P = VI (voltage × current).
Using Ohm's law (V = IR), we can derive two more valid formulas:
• P = I²R (substituting V = IR into P = VI)
• P = V²/R (substituting I = V/R into P = VI)
✅ Option 2 (I²R): Valid power formula.
✅ Option 3 (VI): Fundamental definition of power.
✅ Option 4 (V²/R): Valid derived formula.
❌ Option 1 (IR²): Not a valid power formula. Its dimensional analysis gives (Ampere × Ohm²), which does not equal Watt (power unit).
In short circuit, the value of electric current in a time circuit:
Detailed Explanation:
Short circuit occurs when a path of nearly zero resistance forms in a circuit, bypassing the normal load.
According to Ohm's Law (I = V/R), when resistance R approaches zero, the current I increases dramatically to very high values, limited only by the internal resistance of the source.
This surge can cause overheating, fires, and equipment damage, which is why fuses and circuit breakers are used for protection.
Reactance of a capacitor is
Detailed Explanation:
Capacitive reactance (Xc) is given by the formula Xc = 1/(2πfC), where f is frequency and C is capacitance.
Since f appears in the denominator, as frequency increases, reactance decreases — meaning Xc ∝ 1/f (inversely proportional to frequency).
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Which of the following is not correctly matched?
Detailed Explanation:
Galvanometer measures small electric currents and detects current direction using needle deflection; it does not measure electric resistance.
Voltmeter measures potential difference, Ammeter measures electric current, and Potentiometer measures electromotive force—all correctly matched.
Therefore, Galvanometer-Electric resistance is incorrectly matched, making Option 4 the correct answer.
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