PYQ Vault

Day 152: JEE Mains Physics

5 questions. Try each one first, then open its answer.

  1. Question 1

    Units and Measurements. Asked once: 28 Jul 2022 (same type asked 7 times) See all 7 of this type

    91
    Consider the efficiency of Carnot's engine is given by η=αβsin⁡θlog⁡eβxkT\eta =\frac{\alpha\beta}{\sin\theta}\log_{e}\frac{\beta x}{kT}, where α\alpha and β\beta are constants. If TT is temperature, kk is Boltzman constant, θ\theta is angular displacement and xx has the dimensions of length. Then, choose the incorrect option.

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  2. Question 2

    Oscillations. Asked once: 12 Apr 2023 (same type asked 7 times) See all 7 of this type

    14
    A particle is executing Simple Harmonic Motion (SHM). The ratio of potential energy and kinetic energy of the particle when its displacement is half of its amplitude will be:

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  3. Question 3

    Nuclei. Asked once: 29 Jan 2023 (same type asked 7 times) See all 7 of this type

    11
    If a radioactive element having half-life of 30 min⁡30\text{ }\min is undergoing beta decay, the fraction of radioactive element remains undecayed after 90 min⁡90\text{ }\min. will be

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  4. Question 4

    Thermodynamics. Asked once: 29 Jun 2022 (same type asked 7 times) See all 7 of this type

    26
    300cal300cal. of heat is given to a heat engine and it rejects 225 cal. of heat. If source temperature is 227∘C227^{\circ}C, then the temperature of sink will be ____ ∘C\_\_\_\_\ ^{\circ}C.
  5. Question 5

    Mechanical Properties of Fluids. Asked once: 21 Jan 2026 S1 (same type asked 6 times) See all 6 of this type

    4
    Water flows through a horizontal tube as shown in the figure. The difference in height between the water columns in vertical tubes is 5 cm and the areas of cross-section at AA and BB are 6 cm26{\text{ }cm}^{2} and 3 cm23{\text{ }cm}^{2} respectively. The rate of flow will be ____\_\_\_\_ cm3/scm^{3}/s. (take g=10 m/s2g = 10\text{ }m/s^{2})

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