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Test: Physics - 1 - UPSC MCQ


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10 Questions MCQ Test - Test: Physics - 1

Test: Physics - 1 for UPSC 2024 is part of UPSC preparation. The Test: Physics - 1 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Physics - 1 MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Physics - 1 below.
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Test: Physics - 1 - Question 1
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What is the SI unit for measuring an electric current?

Detailed Solution for Test: Physics - 1 - Question 1
The SI unit for measuring an electric current is the ampere (A). An ampere is defined as the flow of electric charge through a surface at the rate of one coulomb per second. It is used to measure the strength of an electric current in a circuit.
Test: Physics - 1 - Question 2
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What type of current flows in only one direction and is produced by sources like batteries and solar cells?

Detailed Solution for Test: Physics - 1 - Question 2
Direct current (DC) is the type of current that flows in only one direction. It is produced by sources such as batteries, solar cells, and dynamos. In DC, the electric charge moves steadily in a single direction.
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Test: Physics - 1 - Question 3
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What phenomenon occurs when a changing magnetic field induces an electromotive force (EMF) in a conductor, causing electric current to flow?

Detailed Solution for Test: Physics - 1 - Question 3
Faraday's Law of Electromagnetic Induction states that a changing magnetic field induces an electromotive force (EMF) in a conductor, which in turn causes electric current to flow in a closed circuit. This phenomenon is the basis for the generation of electricity in generators.
Test: Physics - 1 - Question 4
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What does the Law of Conservation of Energy state?
Detailed Solution for Test: Physics - 1 - Question 4
The Law of Conservation of Energy states that in a closed system, the total energy remains constant over time. Energy can neither be created nor destroyed; it can only change forms or be transferred between different parts of the system.
Test: Physics - 1 - Question 5
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What is the unit of power in the SI system, and what is the relationship between power and work done?
Detailed Solution for Test: Physics - 1 - Question 5
In the SI system, the unit of power is the watt (W). Power is defined as the rate of doing work or the rate of transferring energy. Mathematically, power (P) is equal to the work done (W) divided by the time taken (t): P = W / t.
Test: Physics - 1 - Question 6
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What force opposes the relative motion of solid surfaces and is responsible for resisting the motion of objects against each other?
Detailed Solution for Test: Physics - 1 - Question 6
The force that opposes the relative motion of solid surfaces and is responsible for resisting the motion of objects against each other is called the frictional force. It acts in the direction opposite to the direction of motion and is a common force in everyday life.
Test: Physics - 1 - Question 7
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Which fundamental quantity is represented by the symbol "K" and is measured in Kelvin (K)?
Detailed Solution for Test: Physics - 1 - Question 7
The fundamental quantity represented by the symbol "K" and measured in Kelvin (K) is temperature. Kelvin is the SI unit of temperature, and it is exactly 1/273.16 of the thermodynamic temperature of the triple point of water.
Test: Physics - 1 - Question 8
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What is the fundamental quantity represented by the symbol "m" and is measured in kilograms (kg)?
Detailed Solution for Test: Physics - 1 - Question 8
The fundamental quantity represented by the symbol "m" and measured in kilograms (kg) is mass. Mass is a measure of the amount of matter an object has, and it is one of the fundamental quantities of the International System of Units (SI).
Test: Physics - 1 - Question 9
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What is the name of the law that states that every two objects in the universe attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them?
Detailed Solution for Test: Physics - 1 - Question 9
Newton's Universal Law of Gravitation states that every two objects in the universe attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. This law describes the gravitational attraction between objects and is fundamental to our understanding of celestial motion.
Test: Physics - 1 - Question 10
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What type of current periodically reverses direction and is used in most electrical power distribution systems?
Detailed Solution for Test: Physics - 1 - Question 10
Alternating current (AC) is the type of current that periodically reverses its direction of flow. It is commonly used in most electrical power distribution systems, making it possible to transmit electricity over long distances efficiently. AC is characterized by its sinusoidal waveform, and it is the standard for household electrical outlets.
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