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Day 461: JEE Mains Physics

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

  1. Question 1

    Motion in a Plane. Asked once: 22 Jan 2025

    25
    A particle is projected at an angle of 30∘30^{\circ} from horizontal at a speed of 60 m/s60\text{ }m/s. The height traversed by the particle in the first second is h0h_{0} and height traversed in the last second, before it reaches the maximum height, is h1h_{1}. The ratio h0:h1h_{0}:h_{1} is ______\_\_\_\_\_\_ [Take, g=10 m/s2g = 10\text{ }m/s^{2} ]

  2. Question 2

    Motion in a Straight Line. Asked once: 23 Jan 2026 S2

    5
    A paratrooper jumps from an aeroplane and opens a parachute after 2 s of free fall and starts deaccelerating with 3 m/s23\text{ }m/s^{2}. At 10 m height from ground, while descending with the help of parachute, the speed of paratrooper is 5 m/s5\text{ }m/s. The initial height of the aeroplane is ____\_\_\_\_ m. (g=10 m/s2)\left( g = 10\text{ }m/s^{2} \right)

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  3. Question 3

    Moving Charges and Magnetism. Asked once: 22 Jan 2025

    82
    An electron projected perpendicular to a uniform magnetic field B moves in a circle. If Bohr's quantization is applicable, then the radius of the electronic orbit in the first excited state is :

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  4. Question 4

    Nuclei. Asked once: 3 Apr 2025

    13
    Match the LIST-I with LIST-II
    LIST-ILIST-II
    A. 01n+92235U→ 54140Xe+3894Sr+2 01n^{1}_{0}n + ^{235}_{92}U \rightarrow\ ^{140}_{54}Xe + ^{94}_{38}Sr + 2\,^{1}_{0}nI. Chemical reaction
    B. 2H2+O2→2H2O2H_{2} + O_{2} \rightarrow 2H_{2}OII. Fusion with +ve Q value
    C. 12H+12H→ 23He+01n^{2}_{1}H + ^{2}_{1}H \rightarrow\ ^{3}_{2}He + ^{1}_{0}nIII. Fission
    D. 11H+13H→ 12H+12H^{1}_{1}H + ^{3}_{1}H \rightarrow\ ^{2}_{1}H + ^{2}_{1}HIV. Fusion with -ve Q value
    Choose the correct answer from the options given below:

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  5. Question 5

    Oscillations. Asked once: 3 Apr 2025

    6
    Two blocks of masses mm and M,(M>m)M,(M>m), are placed on a frictionless table as shown in figure. A massless spring with spring constant k is attached with the lower block. If the system is slightly displaced and released then( μ=\mu= coefficient of friction between the two blocks) (A) The time period of small oscillation of the two blocks is T=2π( m+M)kT = 2\pi\sqrt{\frac{(\text{ }m + M)}{k}} (B) The acceleration of the blocks is a=kxM+ma = \frac{kx}{M + m} ( x=x = displacement of the blocks from the mean position) (C) The magnitude of the frictional force on the upper block is mμ∣x∣M+m\frac{m\mu|x|}{M + m} (D) The maximum amplitude of the upper block, if it does not slip, is μ(M+m)gk\frac{\mu(M + m)g}{k} (E) Maximum frictional force can be μ(M+m)g\mu(M + m)g. Choose the correct answer from the options given below:

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