A pendulum has time period 2 s. If its length is increased by 4 times, new period is MCQ with Answer and Explanation
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Question #1
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A stone tied to a string is whirled in a circle. The work done by tension in string is
Question #2
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The specific latent heat of fusion of ice is 336 kJ/kg. The heat required to melt 2 kg of ice at 0°C is:
Correct Answer: Option B
Explanation:
Heat for phase change Q = m·L_f, where L_f is latent heat of fusion. Thus Q = 2 kg × 336 kJ/kg = 672 kJ. This direct application tests calorimetry fundamentals. Memory aid: 'Latent heat: Q = mL; no temperature change during phase transition'. Competitive exams frequently test such calculations with standard values. Always ensure units match (kg and kJ/kg here); convert if necessary. This problem assesses basic formula application skills essential for thermodynamics sections.
Heat for phase change Q = m·L_f, where L_f is latent heat of fusion. Thus Q = 2 kg × 336 kJ/kg = 672 kJ. This direct application tests calorimetry fundamentals. Memory aid: 'Latent heat: Q = mL; no temperature change during phase transition'. Competitive exams frequently test such calculations with standard values. Always ensure units match (kg and kJ/kg here); convert if necessary. This problem assesses basic formula application skills essential for thermodynamics sections.
Question #3
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What is the primary function of a rectifier in an electrical circuit?
Correct Answer: Option C
Explanation:
A rectifier is an electrical device composed of one or more diodes that allows current to flow only in one direction. Its primary function is to convert Alternating Current (AC), which periodically reverses direction, into Direct Current (DC), which flows in only one direction. The reverse process (DC to AC) is done by an inverter.
A rectifier is an electrical device composed of one or more diodes that allows current to flow only in one direction. Its primary function is to convert Alternating Current (AC), which periodically reverses direction, into Direct Current (DC), which flows in only one direction. The reverse process (DC to AC) is done by an inverter.
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