3. S.I.: Quartz clocks are more accurate than pendulum clocks. S-II: Quartz clocks use periodic motion of simple pendulum for the measurement of time. (A) S-I and S-II are correct and S-II is the correct explanation of S-I. (B) S-I and S-II are correct but S-II is not the correct explanation of S-I. (C) S-I is correct but S-II is wrong. (D) S-I is wrong but S-II is correct.
Answer (1)
Let's evaluate the statements one by one to determine the correct choice:
Statement I (S-I): Quartz clocks are more accurate than pendulum clocks.
True : Quartz clocks are known for their precision and are more accurate than pendulum clocks. This is because quartz clocks use the regular vibration of a quartz crystal to keep time. The crystal oscillates at a very steady frequency when subjected to an electric field, which makes the quartz clock highly precise and reliable compared to pendulum clocks.
Statement II (S-II): Quartz clocks use periodic motion of a simple pendulum for the measurement of time.
False : Quartz clocks do not use a simple pendulum for time measurement. They rely on the electronic properties of quartz crystals as mentioned above, not on pendular motion. Pendulum clocks use the swinging motion of a pendulum to keep time, which is a different mechanism altogether.
Given this analysis:
S-I is correct because quartz clocks are indeed more accurate than pendulum clocks.
S-II is incorrect because quartz clocks do not use pendulum motion.
Therefore, the correct answer is:
(C) S-I is correct but S-II is wrong.
