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Day 402: MHT-CET Physics

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

  1. Question 1

    Oscillations. Asked once: 10 May 2023 S2

    49
    A simple pendulum of length 'l' has a brass bob attached at its lower end. Its period is 'T'. A steel bob of the same size, having density 'x' times that of brass, replaces the brass bob. Its length is then so changed that the period becomes '2T'. What is the new length?

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  2. Question 2

    Rotational Dynamics. Asked once: 25 Apr 2025 S1

    25
    A point mass ' mm ' attached at one end of a massless, inextensible string of length ' ll ' performs a vertical circular motion and the string rotates in vertical plane, as shown in the diagram. The increase in the centripetal acceleration of the point mass when it moves from point A to point C is [ == acceleration due to gravity.]

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  3. Question 3

    Semiconductor Devices. Asked once: 10 May 2024 S2

    35
    A pure Si crystal has 4×10284\times10^{28} atoms per m3^3. It is doped by 1 ppm concentration of antimony. The number of free electrons available will be

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  4. Question 4

    Structure of Atoms and Nuclei. Asked once: 11 May 2023 S1

    39
    If 'T' is the half life of a radioactive substance then its instantaneous rate of change of activity is proportional to

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  5. Question 5

    Superposition of Waves. Asked once: 11 May 2023 S1

    21
    The frequency of two tuning forks A and B are respectively 1.4% more and 2.6% less than that of the tuning fork C. When A and B are sounded together, 10 beats are produced in 1 second. The frequency of tuning fork C is

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