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Day 314: JEE Mains Physics

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

  1. Question 1

    Dual Nature of Radiation and Matter. Asked once: 29 Jan 2023 (same type asked 3 times) See all 3 of this type

    2
    The threshold wavelength for photoelectric emission from a material is 5500 A˚5500\text{ Å}. Photoelectrons will be emitted, when this material is illuminated with monochromatic radiation from a (A) 75 W75\text{ }W infra -red lamp (B) 10 W10\text{ }W infra-red lamp (C) 75 W75\text{ }W ultra - violet lamp (D) 10 W10\text{ }W ultra-violet lamp Choose the correct answer from the options given below:

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  2. Question 2

    Electromagnetic Induction. Asked once: 2021 Paper 21 (same type asked 3 times) See all 3 of this type

    10
    A constant magnetic field of 1 T1\text{ }T is applied in the x>0x> 0 region. A metallic circular ring of radius 1 m1\text{ }m is moving with a constant velocity of 1 m/s1\text{ }m/s along the xx-axis. At t=0 st = 0\text{ }s, the centre of OO of the ring is at x=−1 mx= - 1\text{ }m. What will be the value of the induced emf in the ring at t=1 st= 1\text{ }s ? (Assume the velocity of the ring does not change.)

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  3. Question 3

    Motion in a Plane. Asked once: 2021 Paper 23 (same type asked 3 times) See all 3 of this type

    4
    Statement I: Two forces (P→+Q→)(\overrightarrow{P}+\overrightarrow{Q}) and (P→−Q→)(\overrightarrow{P}-\overrightarrow{Q}) where P→⊥Q→\overrightarrow{P}\bot\overrightarrow{Q}, when act at an angle θ1\theta_{1} to each other, the magnitude of their resultant is 3(P2+Q2)\sqrt{3\left( P^{2}+Q^{2} \right)}, when they act at an angle θ2\theta_{2}, the magnitude of their resultant becomes 2(P2+Q2)\sqrt{2\left( P^{2}+Q^{2} \right)}. This is possible only when θ1<θ2\theta_{1}<\theta_{2}. Statement II: In the situation given above. θ1=60∘\theta_{1}=60^{\circ} and θ2=90∘\theta_{2}=90^{\circ} In the light of the above statements, choose the most appropriate answer from the options given below:

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  4. Question 4

    Gravitation. Asked once: 25 Jun 2022 (same type asked 3 times) See all 3 of this type

    115
    Two satellites S1S_{1} and S2S_{2} are revolving in circular orbits around a planet with radius R1=3200 kmR_{1}= 3200\text{ }km and R2=800 kmR_{2}= 800\text{ }km respectively. The ratio of speed of satellite S1S_{1} to the speed of satellite S2S_{2} in their respective orbits would be 1x\frac{1}{x} where x=x =

  5. Question 5

    Laws of Motion. Asked once: 26 Jul 2022 (same type asked 3 times) See all 3 of this type

    93
    A ball of mass 0.15 kg0.15\text{ }kg hits the wall with its initial speed of 12 ms−112{\text{ }ms}^{- 1} and bounces back without changing its initial speed. If the force applied by the wall on the ball during the contact is 100 N100\text{ }N. calculate the time duration of the contact of ball with the wall.

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