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Day 212: MHT-CET Physics

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

  1. Question 1

    Electrostatics. Asked once: 13 May 2026 S1 (same type asked 6 times) See all 6 of this type

    125
    Three point charges +q,−2q+q, -2q and −2q-2q are placed at the vertices of an equilateral triangle of side a. The work done by some external force to increase their separation to '2a' will be (K=14πε0)\left(K = \dfrac{1}{4\pi\varepsilon_0}\right)

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  2. Question 2

    Semiconductor Devices. Asked once: 2 May 2023 S1 (same type asked 6 times) See all 6 of this type

    33
    In an NPN transistor 101010^{10} electrons enter the emitter in 10−610^{-6} s and 2% electrons recombine with holes in base. The current ratios α\alpha and β\beta of a transistor are respectively (nearly)

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  3. Question 3

    Optics (Ray). Asked once: 2 May 2023 S2 (same type asked 6 times) See all 6 of this type

    20
    A concave mirror of focal length 'f' produces an image 'n' times the size of the object. If the image is real, then the distance of the object from the mirror is

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  4. Question 4

    Magnetic Fields Due to Electric Current. Asked once: 9 May 2023 S1 (same type asked 6 times) See all 6 of this type

    32
    The magnetic field intensity inside a current-carrying solenoid is 2.4×103 Am−12.4 \times 10^3\,\text{Am}^{-1}. If length and number of turns of a solenoid is 15 cm and 60 turns respectively. The current flowing in the solenoid is

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  5. Question 5

    Superposition of Waves. Asked once: 9 May 2024 S1 (same type asked 6 times) See all 6 of this type

    36
    The equation of a simple harmonic progressive wave is given by y=1asin⁡ωt±1bcos⁡ωty = \frac{1}{\sqrt{a}}\sin\omega t \pm \frac{1}{\sqrt{b}}\cos\omega t. Then the resultant amplitude of the wave is (cos⁡90∘=0\cos 90^\circ = 0)

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