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Gas geyser heats flowing water: rate of fuel consumption

The same question, asked 2 times: 26 Jun 2022*, 21 Jan 2026 S1. Every wording below, oldest first.

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  1. Question 1

    26 Jun 2022

    114
    A geyser heats water flowing at a rate of 2.0 kg2.0\text{ }kg per minute from 30∘C30^{\circ}C to 70∘C70^{\circ}C. If geyser operates on a gas burner, the rate of combustion of fuel will be ____\_\_\_\_ gmin⁡−1g\min^{- 1}. [Heat of combustion =8×103Jg−1= 8 \times10^{3}Jg^{- 1} Specific heat of water =4.2Jg−1 ∘C−1= 4.2Jg^{- 1}\ ^{\circ}C^{- 1}]

  2. Question 2

    21 Jan 2026 S1

    2
    A gas based geyser heats water flowing at the rate of 5.0 litres per minute from 27∘C27^{\circ}C to 87∘C87^{\circ}C. The rate of consumption of the gas is ____\_\_\_\_ g/s. (Take heat of combustion of gas =5.0×104 J/g= 5.0 \times10^{4}\text{ }J/g ) specific heat capacity of water =4200 J/kg⋅ ∘C= 4200\text{ }J/kg \cdot\ ^{\circ}C

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