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Day 108: JEE Mains Physics

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

  1. Question 1

    Nuclei. Asked 2 times: 2021 Paper 6*, 2021 Paper 14 (* = numbers or wording changed that year) See all 2 times it was asked

    7
    Half life time of Gold is 3 days. Find the activity of a sample of 2mg2mg of gold.

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  2. Question 2

    Kinetic Theory. Asked 2 times: 2021 Paper 7*, 2021 Paper 8 (* = numbers or wording changed that year) See all 2 times it was asked

    2
    If one mole of the polyatomic gas is having two vibrational modes and β\beta is the ratio of molar specific heats for polyatomic gas (β=CPCV)\left( \beta=\frac{C_{P}}{C_{V}} \right) then the value of β\beta is:

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  3. Question 3

    Electrostatics. This type asked 2 times: 2021 Paper 18, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 2 of this type

    21
    A parallel plate capacitor is having separation between plates 0.885 mm . It has a capacitance of 1μ F1\mu\text{ }F when the space between the plates is filled with an insulating material of resistivity 1×1013Ω m1 \times 10^{13}\Omega\text{ }m and resistance 17.7×1014Ω17.7 \times 10^{14}\Omega. Relative permittivity of the insulating material is α×107\alpha \times 10^{7}. The value of α\alpha is ____\_\_\_\_ . (Take permittivity of free space =8.85×10−12 F/m= 8.85 \times 10^{- 12}\text{ }F/m)

  4. Question 4

    Nuclei. This type asked 2 times: 2021 Paper 13, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 2 of this type

    19
    Two radioactive substances A and B of mass numbers 200 and 212 respectively, shows spontaneous α\alpha-decay with same Q value of 1 MeV . The ratio of energies of α\alpha-rays produced by A and BB is ____\_\_\_\_ .

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  5. Question 5

    Ray Optics. This type asked 2 times: 29 Jul 2022, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 2 of this type

    17
    Light ray incident along a vector AO→(AO→=2i^−3j^)\overrightarrow{AO}(\overrightarrow{AO}= 2\widehat{i}- 3\widehat{j}) emerges out along vector OB→(OB→=Ci^−4j^)\overrightarrow{OB}(\overrightarrow{OB}= C\widehat{i}- 4\widehat{j}) as shown in the figure below. The value of C is ____\_\_\_\_ .

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