12 - இயற்பியல் - அலகு - 4

The correct answer states that "AC - யில் மட்டும்" which means "only in AC". This suggests that the action of "மின்மாற்றி செயல்படுவது" (electric conversion) occurs exclusively in AC. The other options mention DC as well, but the correct answer specifies that it only happens in AC.

The given answer "அறைச் சூடேற்றி" means "to avoid short circuit" in English. In the context of the question, it suggests that the use of an electric fuse or circuit breaker is necessary to prevent short circuits. This is a valid explanation as short circuits can cause damage to electrical equipment and pose a safety hazard.

The correct answer is "ஆற்றல் அழிவின்மை" (Motion blur). This is because the question is asking about the characteristic or property of a lens, and "ஆற்றல் அழிவின்மை" refers to the blurring or distortion of motion in an image caused by the lens.

The correct answer is "சுழி" which means "slender" in English. This answer is the most appropriate because the question is asking for the description of the நேர்க்கடத்தி (timepiece) and "சுழி" accurately describes a slender or slim timepiece.

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When a coil is wound around a magnetic core, it creates an inductance value. The inductance value determines the amount of opposition to the change in current flowing through the coil. In this question, when the magnetic core of the coil is changed, the inductance value of the coil also changes. The given answer of 0.3 H suggests that the inductance value of the coil is 0.3 Henrys when the magnetic core is altered.

The given question is asking for the value of the voltage produced by a DC motor with the same current as the given AC currents. The correct answer is "5 A rms மின்னோட்டம்" which means that the voltage produced by the DC motor will be 5 A rms.

The given answer states that the root mean square (rms) value of an AC voltage is equal to 1.414 times the average value of the AC voltage. This is a well-known relationship in electrical engineering. The rms value represents the effective value of the AC voltage, which takes into account both the magnitude and the alternating nature of the voltage waveform. The average value, on the other hand, only considers the magnitude of the voltage waveform. The ratio of 1.414 is derived from the mathematical relationship between the rms value and the peak value of a sinusoidal waveform.

The correct answer is "மின்தேக்கி". This is because the question asks for the device that does not allow the clockwise rotation of the clock hand. "மின்தேக்கி" is a device that prevents the clockwise rotation of the clock hand, making it the correct answer.

The correct answer is "உள்ளீடு திறன்" which means "Input power". This option suggests that increasing the input power is not enough to increase the height of the jump. Therefore, it cannot be used to achieve the desired result.

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When a compass needle is placed near a wire carrying a current, the magnetic field produced by the current causes the needle to align itself with the field. The strength of the magnetic field is measured in units called Weber (Wb). In this case, the compass needle is placed near a loop of wire carrying a current of 10 Amps. Since the question states that the compass needle points towards the loop, it implies that the magnetic field produced by the loop is in the same direction as the compass needle. Therefore, the magnetic field strength must be 1 Weber (Wb), as that is the only option that aligns the compass needle in the given scenario.

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