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Day 251: JEE Mains Physics

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

  1. Question 1

    Gravitation. Asked once: 2021 Paper 5 (same type asked 2 times) See all 2 of this type

    7
    The maximum and minimum distances of a comet from the Sun are 1.6×1012 m1.6 \times10^{12}\text{ }m and 8.0×1010 m8.0 \times10^{10}\text{ }m respectively. If the speed of the comet at the nearest point is 6×104 ms−16 \times10^{4}{\text{ }ms}^{- 1}, the speed at the farthest point is :

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  2. Question 2

    Nuclei. Asked once: 2021 Paper 6 (same type asked 2 times) See all 2 of this type

    19
    Calculate the time interval between 33%33\% decay and 67%67\% decay if half-life of a substance is 20 minutes.

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  3. Question 3

    Gravitation. Asked once: 2021 Paper 1 (same type asked 2 times) See all 2 of this type

    7
    Two stars of masses mm and 2m2m at a distance d rotate about their common centre of mass in free space. The period of revolution is -

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  4. Question 4

    Gravitation. Asked once: 2021 Paper 2 (same type asked 2 times) See all 2 of this type

    11
    A body weighs 49 N49\text{ }N on a spring balance at the north pole. What will be its weight recorded on the same weighing machine, if it is shifted to the equator? [Use g=GMR2=9.8 ms−2g =\frac{GM}{R^{2}}= 9.8{\text{ }ms}^{- 2} and radius of earth, =6400 km= 6400\text{ }km.]

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  5. Question 5

    Oscillations. Asked once: 2021 Paper 6 (same type asked 2 times) See all 2 of this type

    18
    Amplitude of a mass-spring system, which is executing simple harmonic motion decreases with time. If mass =500 g= 500\text{ }g, Decay constant =20 g/s= 20\text{ }g/s then how much time is required for the amplitude of the system to drop to half of its initial value? (ln⁡2=0.693)(\ln2 = 0.693)

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