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Test: Physics - 2 - UPSC MCQ


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10 Questions MCQ Test - Test: Physics - 2

Test: Physics - 2 for UPSC 2024 is part of UPSC preparation. The Test: Physics - 2 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Physics - 2 MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Physics - 2 below.
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Test: Physics - 2 - Question 1
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What type of wave exhibits particle motion that is parallel to the direction of energy transport?

Detailed Solution for Test: Physics - 2 - Question 1
In a longitudinal wave, the motion of individual particles of the medium is parallel to the direction of energy transport. This means that the particles of the medium move back and forth in the same direction that the wave is traveling. Sound waves in air are a classic example of longitudinal waves, where air particles oscillate in the same direction as the sound wave is propagating.
Test: Physics - 2 - Question 2
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What is the phenomenon called when there is an apparent upward shift in frequency for an observer and a source approaching each other?

Detailed Solution for Test: Physics - 2 - Question 2
The Doppler effect is the phenomenon produced by a moving source of waves, in which there is an apparent shift in frequency when the source and the observer are approaching each other. This effect is observed with various types of waves, including sound waves, where it causes a change in pitch as a sound source moves relative to an observer.
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Test: Physics - 2 - Question 3
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What is the range of human hearing for sound frequencies?

Detailed Solution for Test: Physics - 2 - Question 3
The audible range of sound for human beings typically extends from approximately 20 Hz (hertz) to 20,000 Hz. Sounds with frequencies below 20 Hz are called infrasonic sound, while those with frequencies higher than 20,000 Hz are referred to as ultrasonic sound. Human hearing varies among individuals, but this is the typical range.
Test: Physics - 2 - Question 4
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What is the process of heat transfer that does not require a medium for propagation?
Detailed Solution for Test: Physics - 2 - Question 4
Radiation is the process of heat transfer that does not require a medium for propagation. It involves the emission of electromagnetic waves, such as infrared radiation, from a hot object to its surroundings. Unlike conduction and convection, radiation can occur through a vacuum, making it essential for the transfer of heat from the Sun to the Earth.
Test: Physics - 2 - Question 5
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What is the property of a perfectly black body with regard to incoming radiation?
Detailed Solution for Test: Physics - 2 - Question 5
A perfectly black body is a theoretical object that absorbs all incoming electromagnetic radiation without reflecting or transmitting any of it. It is often used as an idealized concept in thermodynamics and radiation physics to understand the behavior of real objects regarding emission and absorption of radiation.
Test: Physics - 2 - Question 6
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Which of the following statements is true about the critical mass in a nuclear chain reaction?
Detailed Solution for Test: Physics - 2 - Question 6
Critical mass refers to the minimum mass of fissile material, such as uranium or plutonium, required to sustain a self-sustaining nuclear chain reaction. Below the critical mass, the reaction will not continue indefinitely, while above it, the reaction will continue and potentially lead to an explosion in the case of an uncontrolled chain reaction.
Test: Physics - 2 - Question 7
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What is the temperature at which all molecular motion theoretically ceases, known as?
Detailed Solution for Test: Physics - 2 - Question 7
Absolute zero is the lowest possible temperature where all molecular motion theoretically ceases. It is typically defined as 0 Kelvin (0 K) on the Kelvin scale or -273.15 degrees Celsius (-273.15°C) on the Celsius scale. At absolute zero, particles have the minimum possible energy and exhibit no thermal motion.
Test: Physics - 2 - Question 8
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What is the term for the rise of a liquid inside a small-diameter tube due to adhesive forces between the liquid and the tube's inner walls?
Detailed Solution for Test: Physics - 2 - Question 8
Capillary action is the phenomenon where a liquid rises inside a small-diameter tube, such as a capillary, due to adhesive forces between the liquid and the inner walls of the tube. This effect is particularly noticeable in narrow tubes and is governed by a balance between cohesive and adhesive forces.
Test: Physics - 2 - Question 9
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What type of waves are sound waves in air, where particles of the medium vibrate parallel to the direction of the wave's movement?
Detailed Solution for Test: Physics - 2 - Question 9
Sound waves in air are classified as longitudinal waves. In a longitudinal wave, the particles of the medium (in this case, air) vibrate parallel to the direction in which the wave is moving. This means that as sound waves propagate through the air, the air particles oscillate back and forth in the same direction as the wave's movement.
Test: Physics - 2 - Question 10
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Which law of thermodynamics states that energy can be changed from one form to another but cannot be created or destroyed?
Detailed Solution for Test: Physics - 2 - Question 10
The First Law of Thermodynamics, also known as the law of energy conservation, states that energy can be changed from one form to another, but it cannot be created or destroyed. In other words, the total energy within a closed system remains constant.
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