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CBSE Class 12 Physics 2026 All Sets Paper
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Question : 10 of 16
Marks:
+1,
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Which of the following statements is not true for electric energy in ac form compared to that in dc form?
Solution:
Statement A: True.
AC generators are generally simpler in construction and more durable than DC generators.
Statement B: True.
Transformers can efficiently increase or decrease AC voltage.
Statement C: True.
AC can be stepped up to high voltages for transmission, allowing low current flow and minimizing power losses.
Statement D: False.
AC is typically more dangerous than DC at the same voltage. For example, 220V AC has a peak value of about 311V, and AC frequencies (50–60 Hz) can interfere more severely with the human heart’s rhythm.
The statement ”AC is less dangerous” is incorrect.
AC generators are generally simpler in construction and more durable than DC generators.
Statement B: True.
Transformers can efficiently increase or decrease AC voltage.
Statement C: True.
AC can be stepped up to high voltages for transmission, allowing low current flow and minimizing power losses.
Statement D: False.
AC is typically more dangerous than DC at the same voltage. For example, 220V AC has a peak value of about 311V, and AC frequencies (50–60 Hz) can interfere more severely with the human heart’s rhythm.
The statement ”AC is less dangerous” is incorrect.
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