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Day 267: JEE Mains Physics

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

  1. Question 1

    Atoms. Asked once: 13 Apr 2023 (same type asked 6 times) See all 6 of this type

    25
    The radius of 2nd 2^{\text{nd~}} orbit of He+He^{+}of Bohr's model is r1r_{1} and that of fourth orbit of Be3+Be^{3 +} is represented as r2r_{2}. Now the ratio r2r1\frac{r_{2}}{r_{1}} is x:1x:1. The value of xx is____

  2. Question 2

    Kinetic Theory. Asked once: 31 Jan 2024 (same type asked 6 times) See all 6 of this type

    98
    A gas mixture consists of 8 moles of argon and 6 moles of oxygen at temperature T. Neglecting all vibrational modes, the total internal energy of the system is

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  3. Question 3

    Moving Charges and Magnetism. Asked once: 11 Apr 2023 (same type asked 6 times) See all 6 of this type

    14
    The current sensitivity of moving coil galvanometer is increased by 25%25\%. This increase is achieved only by changing wire while keeping the resistance of galvanometer coil constant. The percentage change in the voltage sensitivity will be:

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  4. Question 4

    Atoms. Asked once: 30 Jan 2024 (same type asked 6 times) See all 6 of this type

    23
    An electron of a hydrogen atom in an excited state has energy En=−0.85eVE_{n}= - 0.85eV. The maximum number of allowed transitions to lower energy level is ............

  5. Question 5

    Electromagnetic Induction. Asked once: 30 Jan 2024 (same type asked 6 times) See all 6 of this type

    30
    A ceiling fan having 3 blades of length 80 cm80\text{ }cm each is rotating with an angular velocity of 1200rpm1200rpm. The magnetic field of earth in that region is 0.5G0.5G and angle of dip is 30∘30^{\circ}. The emf induced across the blades is Nπ×10−5 VN\pi\times10^{- 5}\text{ }V. The value of NN is _______