The rate of change of momentum is equal to MCQ with Answer and Explanation
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Question #1
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The image formed by a concave lens is always
Question #2
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The time period of a simple pendulum on the surface of the moon compared to its time period on Earth is:
Correct Answer: Option A
Explanation:
The time period of a pendulum is T = 2 * pi * sqrt(L/g). The acceleration due to gravity on the moon (g_moon) is roughly 1/6th of that on Earth (g_earth). Since g decreases, and T is strictly inversely proportional to the square root of g, the time period T must increase. The pendulum will swing much slower.
The time period of a pendulum is T = 2 * pi * sqrt(L/g). The acceleration due to gravity on the moon (g_moon) is roughly 1/6th of that on Earth (g_earth). Since g decreases, and T is strictly inversely proportional to the square root of g, the time period T must increase. The pendulum will swing much slower.
Question #3
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A student measures the length of a rod as 3.50 cm using a vernier caliper with least count 0.01 cm. The number of significant figures in this measurement is:
Correct Answer: Option C
Explanation:
The measurement 3.50 cm has three significant figures. All non-zero digits (3,5) are significant, and the trailing zero after the decimal point is also significant as it indicates precision of the measuring instrument. The least count of 0.01 cm confirms that the measurement is precise to hundredths place. Significant figures reflect measurement reliability. Exam tip: Trailing zeros after decimal are always significant; leading zeros are never significant. This concept is crucial for error analysis in experimental physics questions.
The measurement 3.50 cm has three significant figures. All non-zero digits (3,5) are significant, and the trailing zero after the decimal point is also significant as it indicates precision of the measuring instrument. The least count of 0.01 cm confirms that the measurement is precise to hundredths place. Significant figures reflect measurement reliability. Exam tip: Trailing zeros after decimal are always significant; leading zeros are never significant. This concept is crucial for error analysis in experimental physics questions.
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