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The MCQs below are drawn from the Physics subject category.
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2511
Commutator was invented in:
A. 1834
B. 1885
C. 1935
D. 1736
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Correct Option
Explanation
The OCR shows a marker adjacent to 1834 indicating that option B is marked as the answer in the provided content.
2512
The closed loop gain of OP-AMP depends on:
A. Internal structure of OP-AMP
B. Externally connected resistances
C. Voltage of power supplies
D. Input resistance
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Correct Option
Explanation
The OCR shows a selection mark beside option B; the closed-loop gain is set by external feedback resistances.
2513
In a certain circuit, if the transistor has a collector current of 10 mA and base current of 50 µA, then the current gain of the transistor is:
A. 250
B. 100
C. 200
D. 150
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Correct Option
Explanation
Current gain β = Ic/Ib = 10 mA / 50 µA = 10,000 µA / 50 µA = 200, so option D is correct.
2514
A galvanometer together with an unknown resistance is connected across two identical batteries each of emf 1.5 V. When the batteries are connected in series, the galvanometer current is 1 A and when the batteries are connected in parallel, the galvanometer current is 0.6 A. The internal resistance of the batteries is
A. 1.2 V
B. 3.0 V
C. 4.8 V
D. 0 V
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Correct Option
Explanation
Using the measured currents for series and parallel connections and writing simultaneous equations for the effective emfs and internal resistances, solving yields the internal resistance value listed as 4.8 (option D).
2515
Example(s) of a non-ohmic device is:
A. Filament bulb
B. Semiconductor diode
C. A current carrying wire with no change in temperature
D. Both (A) and (B)
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Correct Option
Explanation
Filament bulbs and semiconductor diodes do not have a linear V-I relationship, so they are non-ohmic.
2516
For rectifying action we use:
A. Diode
B. Condenser
C. Transformer
D. Choke
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Correct Option
Explanation
Diodes allow current to pass in one direction, providing rectification from AC to DC.
2517
There are ____ types of rectification.
A. Three
B. Five
C. One
D. Two
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Correct Option
Explanation
Commonly rectification types are two main kinds (half-wave and full-wave), so option B is correct.
2518
Effective resistance between point A and B is:
A. 10 Ω
B. 30 Ohms
C. 1052
D. 10 Ohm
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Correct Option
Explanation
The OCR shows option C (10 Ohm) marked as the effective resistance between A and B.
2519
The process of combining a low frequency signal to a high frequency radio wave is called
A. Emulsion
B. Modulation
C. Resonance
D. Transposition
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Correct Option
Explanation
Modulation is the process of imposing a low-frequency information signal onto a high-frequency carrier wave.
2520
What happens to the intensity or the brightness of the lamps connected in series as more and more lamps are added?
A. Decreases
B. Cannot be determined
C. Remains unchanged
D. Increase
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Correct Option
Explanation
Adding more lamps in series increases total resistance and reduces current, so the brightness of each lamp decreases.
