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Day 555: JEE Mains Physics

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

  1. Question 1

    Kinetic Theory. Asked once: 2021 Paper 16

    7
    Pressure of a monatomic gas in a container is 2 atm2\text{ }atm. Average kinetic energy per molecule is 2×10−9 J2 \times10^{- 9}\text{ }J. Volume of gas is 1 litre. Find number of molecules of gas present in the container.

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  2. Question 2

    Laws of Motion. Asked once: 29 Jul 2022

    104
    Two bodies of masses m1=5 kgm_{1}= 5\text{ }kg and m2=3 kgm_{2}= 3\text{ }kg are connected by a light string going over a smooth light pulley on a smooth inclined plane as shown in the figure. The system is at rest. The force exerted by the inclined plane on the body of mass m1m_{1} will be:[Take  g=10 ms−2]\left. \ g = 10{\text{ }ms}^{- 2} \right\rbrack

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  3. Question 3

    Motion in a Plane. Asked once: 25 Jan 2023

    29
    If P→=3ı^+3ȷ^+2k^\overrightarrow{P}= 3\widehat{\imath}+\sqrt{3}\widehat{\jmath}+ 2\widehat{k} and Q→=4ı^+3ȷ^+2.5k^\overrightarrow{Q}= 4\widehat{\imath}+\sqrt{3}\widehat{\jmath}+ 2.5\widehat{k} then, The unit vector in the direction of P→×Q→\overrightarrow{P}\times\overrightarrow{Q} is 1x(3ı^+ȷ^−23k^)\frac{1}{x}(\sqrt{3}\widehat{\imath} + \widehat{\jmath} - 2\sqrt{3}\widehat{k}). The value of xx is ____\_\_\_\_.

  4. Question 4

    Motion in a Straight Line. Asked once: 29 Jan 2023

    98
    A force acts for 20 s20\text{ }s on a body of mass 20 kg20\text{ }kg, starting from rest, after which the force ceases and then body describes 50 m50\text{ }m in the next 10 s10\text{ }s. The value of force will be:

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  5. Question 5

    Oscillations. Asked once: 2021 Paper 4

    6
    The point AA moves with a uniform speed along the circumference of a circle of radius 0.36 m0.36\text{ }m and cover 30∘30^{\circ} in 0.1 s0.1\text{ }s. The perpendicular projection ' PP ' from ' AA ' on the diameter MNMN represents the simple harmonic motion of ' PP '. The restoration force per unit mass when PP touches MM will be:

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