Physics
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Physics questions with answers

2,629 multiple-choice questions. Open any question for its answer and explanation.

Questions asked in State PSC and UPSC prelims, by topic. Each topic also has notes to read.

Read the notes: Heat and Thermodynamics →

  1. A cup of tea is placed at a table, and the room temperature is 35°C. The tea cools from 90°C to 70°C in 5 minutes. Which one among the following is the correct time taken for the tea to cool from 70°C to 50°C ?Asked in UPSC Geoscientist 2024
  2. The solar cooker works on the same principle asAsked in WBPSC CS Prelims 2015
  3. Good absorbers of heat areAsked in WBPSC CS Prelims 2019
  4. The colour of a star indicates itsAsked in UPPSC Upper Mains 2008
  5. Consider the following statement: An ordinary light bulb has a rather short life because the I. filament wire is not uniform. II. bulb cannot be evacuated completely. III. wires supporting the filament melt at high temperatures. Which of the above statements are correct?Asked in UPPCS Prelims 1999
  6. Temp. of Bulb Filament on lighting is:Asked in RPSC RAS Prelims 2007
  7. Sun Spots appear dark because they:Asked in APPSC Draughtman 2008
  8. If G is irradiation and E$_{b}$ is the emissive power, the radiosity (J) of a surface is expressed by - (1) J = G + $\epsilon$E$_{b}$ - (3) J = $ \rho$G + $\epsilon$.E$_{b}$ - (4) J = $\rho$G + E$_{b}$ - (5) Question not attempted Where $ \rho$ is reflectivity and $\epsilon$ is emissivity of a surface.Asked in Assistant Eng. (Mechanical) Competitive Examination, 2023
  9. For estimating the shape factor in radiative heat transfer, the Reciprocity theorem states - - (4) $\epsilon_{1}$ F$_{1-2}$ = $\epsilon_{2}$ F$_{2-1}$ - (5) Question not attemptedAsked in Assistant Eng. (Mechanical) Competitive Examination, 2023
  10. Consider two concentric spheres, as shown in figure. If r₁ and r₂ are the radii of the inner and outer spheres respectively, then the view factor F₂₂ is given by - If the question has multiple statements, format using ... - For Assertion/Reason, retain 'Statement-I' and 'Statement-II' clearly. - For matching pairs, use HTMLAsked in Assistant Eng. (Mechanical) Competitive Examination, 2023
  11. Radiation shields are used to reduce the heat transfer between two heat exchanging surfaces. If n is the number of radiation shields, the following expression is correct : (1) q/A with shields = 1/(n+1) * q/A without shields (2) q/A with shields = 1/(n+1) * q/A without shields (3) q/A with shields = n * q/A without shields (4) q/ A with shields = n * q/A without shields (5) Question not attemptedAsked in Assistant Eng. (Mechanical) Competitive Examination, 2023
  12. A hot object loses heat to its surroundings in the form of heat radiation. The rate of loss of heat depends on the-Asked in ASCO 2014
  13. A Bunsen burner can reach a temperature of approximatelyAsked in JUNIOR laboratory assistant 2025
  14. Fires involving ordinary combustibles, such as paper, wood and furniture's is known asAsked in JUNIOR laboratory assistant 2025
  15. An ultimate source of energy stored in fossil fuels isAsked in RO ARO 2020
  16. While cooking, the bottom of the vessel is getting blackened on the outside, it means that :Asked in Executive Officer and Tax & Revenue Inspector Exam 2023
  17. Consider the following statements : Assertion (A) : Light coloured clothes are preferred in summer. Reason (R) : Light colours are poor absorbers of heat. Select correct answer from the code given below :Asked in RO ARO pre 2016
  18. A hot object loses heat to its surroundings in the form of heat radiation. The rate of loss of heat depends on the- - temperature of the object - temperature of the surroundings - temperature difference between the object and its surroundings - average temperature of the object and its surroundingsAsked in HORTICULTURE DEVELOPMENT OF‐ FICER(HDO) 2015
  19. After a hot sunny day, people sprinkle water on the roof-top because :Asked in UPSC CDS 1 2016
  20. A piece of ice, 100 g in mass is kept at 0 °C. The amount of heat it requires to melt at 0 °C is (take latent heat of melting of ice to be 333.6 J/ g):Asked in UPSC CDS 1 2016
  21. Which of the following represents a relation for 'heat lost = heat gained'?Asked in UPSC CDS 1 2018
  22. An ice bullet of temperature – 10°C is fired upon an object. The bullet spends 20% of its kinetic energy in penetrating into the object and remaining kinetic energy is spent into melting the bullet at 0°C. The latent heat of fusion of ice is 3·4 × 10⁵ J kg⁻¹ and its specific heat capacity is 2000 J kg⁻¹ K⁻¹. Which one among the following is the correct initial speed of the bullet ?Asked in UPSC Geoscientist 2024
  23. 100 grams of ice at 0°C is put in 240 grams of water at 5°C. The mixture finally comes to equilibrium at 0°C with m grams of ice melted in the process. Value of m is close to : (latent heat of ice = 3.33 × 105 J/kg and specific heat of water = 4.2 J g-1°C)Asked in UPSC Geoscientist 2024
  24. There are two statements given below : Statement I : Steam produces less severe burns than water at the same temperature. Statement II : Dry ice is colder than regular ice. In the light of these two statements, choose the most appropriate answer from the options given below :Asked in HPPSC HPAS Prelims 2021
  25. The amount of heat required for a substance to change from one state to another without change in temperature is called :Asked in HAS Prelims 2019