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Thermal Properties of Matter

MHT-CET Physics. Try each one first, then open its answer.

Top 10 MHT-CET PYQs to practise first

The questions and kinds of question asked most often come first. Each one says how often and in which papers.

  1. Question 1

    Asked 11 times: 9 May 2023 S2*, 16 May 2023 S1*, 10 May 2024 S1*, 10 May 2024 S2*, 12 May 2024 S2*, 11 Apr 2026 S1*, 15 Apr 2026 S2*, 16 Apr 2026 S1*, 18 Apr 2026 S2*, 14 May 2026 S2, 19 May 2026 S2 (* = numbers or wording changed that year) See all 11 times it was asked

    113
    The power radiated by a black body is PP and it radiates maximum energy at wavelength λo\lambda_o. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength 0.75λo0.75\lambda_o, the power radiated by it becomes nPnP. The value nn is

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  2. Question 2

    This type asked 11 times: 10 May 2023 S1, 10 May 2023 S2, 12 May 2024 S1, 19 Apr 2025 S1, 21 Apr 2025 S1, 25 Apr 2025 S1, 26 Apr 2025 S2, 13 Apr 2026 S1, 15 Apr 2026 S2, 16 Apr 2026 S1, 12 May 2026 S2. This one: 12 May 2026 S2 See all 11 of this type

    112
    A rectangular black body of temperature 27∘C27^\circ C has surface area 66 cm ×3\times 3 cm and rate of radiation EE. If its temperature is increased by 300∘C300^\circ C and its linear dimensions are reduced to (13)rd\left(\dfrac{1}{3}\right)^{rd} of their initial value then the rate of radiation is

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  3. Question 3

    This type asked 10 times: May 2021 S1, 9 May 2023 S2, 10 May 2023 S2, 20 Apr 2025 S1, 21 Apr 2025 S2, 25 Apr 2025 S1, 11 Apr 2026 S2, 15 Apr 2026 S1, 16 Apr 2026 S2, 18 Apr 2026 S2. This one: 18 Apr 2026 S2 See all 10 of this type

    113
    A body cools from a temperature 3θ3\theta to 2θ2\theta in 10 minute. The room temperature is θ\theta. The temperature of the body at the end of the next 10 minute is 'xx'. Assuming that Newton's law of cooling is applicable, the value of 'xx' will be

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  4. Question 4

    This type asked 8 times: 3 May 2023 S1, 10 May 2024 S1, 19 Apr 2025 S2, 22 Apr 2025 S1, 17 Apr 2026 S1, 19 Apr 2026 S1, 13 May 2026 S1, 13 May 2026 S2. This one: 13 May 2026 S2 See all 8 of this type

    114
    If 150150 J of energy is incident on area 2m22\mathrm{m^2} and amount of heat reflected is 1515 J, coefficient of absorption is 0.60.6 the amount of energy transmitted is

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  5. Question 5

    This type asked 7 times: 3 May 2023 S1, 3 May 2023 S2, 9 May 2023 S1, 16 May 2023 S2, 11 May 2024 S2, 19 Apr 2025 S1, 26 Apr 2025 S1. This one: 26 Apr 2025 S1 See all 7 of this type

    28
    The difference in length between two rods A and B is 60 cm at all temperatures. If αA=18×10−6/ ∘C\alpha_{A}= 18 \times10^{- 6}/\ ^{\circ}C and αB=27×10−6/ ∘C\alpha_{B}= 27 \times10^{- 6}/\ ^{\circ}C, then the length of rodArodA and rodBrodB at 0∘C0^{\circ}C is respectively

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  6. Question 6

    Asked 6 times: 4 May 2023 S1*, 12 May 2024 S2*, 21 Apr 2025 S2*, 17 Apr 2026 S1*, 20 Apr 2026 S1*, 20 Apr 2026 S2 (* = numbers or wording changed that year) See all 6 times it was asked

    114
    A sphere having temperature 600 K is losing heat due to radiation. At this temperature its rate of cooling is RR. The rate of cooling of this sphere at 400 K is x243\dfrac{x}{243}. The value of xx is (Temperature of surrounding is 300 K)

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  7. Question 7

    Asked 6 times: May 2021 S1*, 9 May 2023 S2*, 21 Apr 2025 S2*, 25 Apr 2025 S1*, 11 Apr 2026 S2*, 16 Apr 2026 S2 (* = numbers or wording changed that year) See all 6 times it was asked

    112
    A bowl filled with very hot water cools from 98∘C98^\circ\mathrm{C} to 86∘C86^\circ\mathrm{C} in 2 minutes when the room temperature is 22∘C22^\circ\mathrm{C}. How long it will take to cool from 75∘C75^\circ\mathrm{C} to 69∘C69^\circ\mathrm{C} ?

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  8. Question 8

    This type asked 6 times: 11 May 2024 S1, 13 Apr 2026 S2, 19 Apr 2026 S1, 14 May 2026 S1, 15 May 2026 S1, 19 May 2026 S1. This one: 19 May 2026 S1 See all 6 of this type

    113
    A perfectly black body radiates power at temperature T1T_1K. If it is to radiate 16 times this power, its temperature should be increased by

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  9. Question 9

    This type asked 6 times: 3 May 2023 S1, 11 May 2024 S1, 23 Apr 2025 S1, 26 Apr 2025 S2, 18 Apr 2026 S1, 13 May 2026 S2. This one: 13 May 2026 S2 See all 6 of this type

    115
    The radiation emitted by a star A is 1000010000 times that of the sun. If surface temperature of sun and star A are 60006000 K and 20002000 K respectively, the ratio of radii of star A and sun is

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  10. Question 10

    Asked 5 times: 3 May 2023 S1, 11 May 2024 S1*, 23 Apr 2025 S1, 26 Apr 2025 S2*, 18 Apr 2026 S1 (* = numbers or wording changed that year) See all 5 times it was asked

    113
    Two spherical black bodies of radii R1R_1 and R2R_2 having surface temperature T1T_1 and T2T_2 respectively, radiate the same power. The ratio of R1R_1 to R2R_2 will be

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