Physics - MOST IMPORTANT UPSC EPFO Previous Year Questions
Practice real questions from previous year exams of UPSC EPFO.
📘 Modern Physics📚 Diode- Forward-bias and Reverse-bias
Q1
The device to convert alternating current into direct current is
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📘 Work, Energy and Power📚 Work done under different cases
Q2
Assertion (A): A bus and a car (with lower weight than that of the bus) moving at the same velocity, are brought to rest on a level road by applying brakes which exert same retarding force. The car will travel lesser distance before coming to rest.
Reason (R): The kinetic energy to be destroyed is equal to the work done by the retarding force.
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📘 Force and Motion📚 Inertia and its types
Q3
Assertion (A): A train has come out of the platform and is accelerating. If a person sitting in the train and facing engine, throws up a coin, it will fall ahead of him.
Reason (R): A force acts on the coin whose magnitude is equal to the product of the mass of the coin and acceleration of the train.
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📘 Thermal Properties of Matter📚 Change of Phase between Solids and Liquids- Freezing and Melting
Q4
Which one of the following is a super-cooled liquid?
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📘 Light and Optics📚 Total Internal Reflection and Critical Angle
Q5
Which one of the following causes small air bubbles in water, which is stored in a glass vessel, to appear to shine with a silvery luster?
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📘 Gravitation📚 Conditions affecting the value of gravity
Q6
Weight of a body on the surface of the earth is W₁. The weight of the same body is W₂, at a height of 500 metres above the surface, and W₃ at a depth of 500 metres below the surface of the earth. Which one of the following is the correct relation?
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📘 Gravitation📚 Misc
Q7
Which one of the following is the correct statement?
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📘 Work, Energy and Power📚 Other types of energy- chemical, mechanical, etc.
Q8
Directions: This item consists of two statements, one labeled as the 'Statement (I)' and the other as 'Statement (II)'. You are to examine these two statements carefully and select the answers to these items using the codes given below:
Statement (I): In order to produce electric power from a geothermal reservoir, temperature above 180° is required.
Statement (II): To drive steam turbines, high temperature steam is used.
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📘 Current Electricity📚 Conductors, Semiconductors and Insulators
Q9
If the electrical resistance of a typical substance suddenly drops to zero, then the substance is called :
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📘 Magnetism📚 Electric Fuse
Q10
The material used for electric fuse is an alloy of tin and lead. This alloy should have:
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📘 Force and Motion📚 Physical Quantities related to Motion- acceleration, displacement, etc.
Q11
A train travels at a certain average speed for a distance of 63 km. Thereafter it travels a distance of 72 km with an average speed of 6 km/hour more than the original speed. Total time taken to complete the journey is 3 hours. What is the original average speed of the train?
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📘 Force and Motion📚 Physical Quantities related to Motion- acceleration, displacement, etc.
Q12
A 60 m long train travels at a uniform speed of 72 km/hour. It passes non-stop along the 600 m platform of a wayside station. What is the elapsed time for the train to entirely clear the platform?
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📘 Force and Motion📚 Physical Quantities related to Motion- acceleration, displacement, etc.
Q13
Train A is 75 m long and travels at a uniform speed of 54 km/hour. Train B is 125 m long and travels at a uniform speed of 36 km/hour in the direction opposite to that of Train A. If these trains are crossing at a double track stretch, what is the time taken for the two trains to fully clear each other?
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📘 Modern Physics📚 Light Emitting Diode
Q14
Which lamp has the highest energy efficiency ?
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📘 Wave📚 Electromagnetic wave- Visible light
Q15
Yellow light is a combination of ________ primary colors.
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📘 Light and Optics📚 Images formed by Concave Lens
Q16
Diverging lens produces ________ type of images.
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📘 Thermal Properties of Matter📚 Misc
Q17
The 5th state of matter is :
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📘 Wave📚 Electromagnetic wave- Visible light
Q18
Speed of Blue color light in vacuum is :
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📘 Natural Phenomenon📚 Formation of Rainbow
Q19
In which direction does rainbow appear in the morning ?
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📘 Atomic and Nuclear Physics📚 Misc
Q20
God's particle is the pseudonym of ________
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