The power of a lens is measured in MCQ with Answer and Explanation
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Question #1
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Which of the following is a fundamental unit in the SI system?
Correct Answer: Option B
Explanation:
The seven fundamental SI units are: metre (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), and candela (cd). Candela is the unit of luminous intensity. Newton, joule, and pascal are derived units. Newton = kg·m/s², joule = kg·m²/s², pascal = kg/(m·s²). Hence, candela is a fundamental unit. Exam tip: Remember the acronym ‘MKS A K M C’ for the seven base units.
The seven fundamental SI units are: metre (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), and candela (cd). Candela is the unit of luminous intensity. Newton, joule, and pascal are derived units. Newton = kg·m/s², joule = kg·m²/s², pascal = kg/(m·s²). Hence, candela is a fundamental unit. Exam tip: Remember the acronym ‘MKS A K M C’ for the seven base units.
Question #2
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A capillary tube is dipped in water and the water rises to a height 'h'. If the experiment is performed in a freely falling elevator, the water column in the tube will:
Correct Answer: Option C
Explanation:
The height of capillary rise is given by Jurin's law: h = 2Tcos(theta) / (rrhog). In a freely falling elevator, the effective acceleration due to gravity (g') is zero (weightlessness). As effective g approaches zero, the theoretical height h approaches infinity. In reality, the water will rise to the very top of the tube, regardless of its length, but will not overflow.
The height of capillary rise is given by Jurin's law: h = 2Tcos(theta) / (rrhog). In a freely falling elevator, the effective acceleration due to gravity (g') is zero (weightlessness). As effective g approaches zero, the theoretical height h approaches infinity. In reality, the water will rise to the very top of the tube, regardless of its length, but will not overflow.
Question #3
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Which of the following is a renewable source of energy?
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