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Day 409: JEE Mains Physics

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

  1. Question 1

    Dual Nature of Radiation and Matter. Asked once: 26 Jun 2022 (same type asked 5 times) See all 5 of this type

    120
    The stopping potential for photoelectrons emitted from a surface illuminated by light of wavelength 6630Å6630\text{Å} is 0.42 V0.42\text{ }V. If the threshold frequency is x×1013/sx \times 10^{13}/s, where xx is (nearest integer). (Given, speed light =3×108 m/s= 3 \times10^{8}\text{ }m/s, Planck's constant =6.63×10−34Js= 6.63 \times10^{- 34}Js )

  2. Question 2

    Magnetism and Matter. Asked once: 26 Jun 2022 (same type asked 5 times) See all 5 of this type

    102
    A bar magnet having a magnetic moment of 2.0×2.0 \times 105JT−110^{5}JT^{- 1}, is placed along the direction of uniform magnetic field of magnitude B=14×10−5 TB = 14 \times10^{- 5}\text{ }T. The work done in rotating the magnet slowly through 60∘60^{\circ} from the direction of field is:

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  3. Question 3

    Wave Optics. Asked once: 29 Jun 2022 (same type asked 5 times) See all 5 of this type

    119
    In a double slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the plane of slits. If the screen is moved by 5×10−2 m5 \times10^{- 2}\text{ }m towards the slits, the change in fringe width is 3×10−3 cm3 \times10^{- 3}\text{ }cm. If the distance between the slits is 1 mm1\text{ }mm, then the wavelength of the light will be ____\_\_\_\_ nm.

  4. Question 4

    System of Particles and Rotational Motion. Asked once: 28 Jun 2022 (same type asked 5 times) See all 5 of this type

    4
    Match List-I with List-II.
    List-IList-II
    (A)Moment of inertia of solid sphere of radius RR about any tangent(I)53MR2\frac{5}{3}MR^{2}
    (B)Moment of inertia of hollow sphere of radius RR about any tangent(II)75MR2\frac{7}{5}MR^{2}
    (C)Moment of inertia of circular ring of radius RR about its diameter(III)14MR2\frac{1}{4}MR^{2}
    (D)Moment of inertia of circular disc of radius RR about any diameter(IV)12MR2\frac{1}{2}MR^{2}
    Choose the correct answer from the options given below:

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  5. Question 5

    Motion in a Plane. Asked once: 25 Jul 2022 (same type asked 5 times) See all 5 of this type

    3
    A person moved from AA to BB on a circular path as shown in figure. If the distance travelled by him is 60 m60\text{ }m, then the magnitude of displacement would be: (Given  cos⁡135∘=−0.7)\left. \ \cos135^{\circ}= - 0.7 \right)

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