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Day 83: JEE Mains Physics

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

  1. Question 1

    Waves. This type asked 3 times: 2021 Paper 11, 28 Jul 2022, 6 Apr 2023. This one: 6 Apr 2023 See all 3 of this type

    25
    A person driving car at a constant speed of 15 m/s15\text{ }m/s is approaching a vertical wall. The person notices a change of 40 Hz40\text{ }Hz in the frequency of his car's horn upon reflection from the wall. The frequency of horn is___ Hz. (Given: Speed of sound: 330 m/s330\text{ }m/s )

  2. Question 2

    Alternating Current. This type asked 3 times: 25 Jun 2022, 25 Jul 2022, 1 Feb 2023. This one: 1 Feb 2023 See all 3 of this type

    8
    Match List I with List II:
    List IList II
    A. AC generatorI. Presence of both L and C
    B. TransformerII. Electromagnetic induction
    C. Resonance phenomenon to occurIII. Quality factor
    D. Sharpness of resonanceIV. Mutual induction
    Choose the correct answer from the options given below:

    Tap an option to check your answer.

  3. Question 3

    Current Electricity. This type asked 3 times: 14 Jun 2022, 25 Jul 2022, 1 Feb 2023. This one: 1 Feb 2023 See all 3 of this type

    26
    In an experiment to find emf of a cell using potentiometer, the length of null point for a cell of emf 1.5 V1.5\text{ }V is found to be 60 cm60\text{ }cm. If this cell is replaced by another cell of emf EE, the length-of null point increases by 40 cm40\text{ }cm. The value of EE is x10V\frac{x}{10}V. The value of xx is___

  4. Question 4

    Electromagnetic Waves. This type asked 3 times: 27 Jun 2022, 29 Jul 2022, 31 Jan 2023. This one: 31 Jan 2023 See all 3 of this type

    109
    Match List I with List II
    LIST ILIST II
    A. MicrowavesI. Physiotherapy
    B. UV raysII. Treatment of cancer
    C. Infra-red lightIII. Lasik eye surgery
    D. X-rayIV. Aircraft navigation
    Choose the correct answer from the options given below:

    Tap an option to check your answer.

  5. Question 5

    Electrostatics. This type asked 3 times: 2021 Paper 16, 25 Jul 2022, 31 Jan 2023. This one: 31 Jan 2023 See all 3 of this type

    114
    Two parallel plate capacitors C1C_{1} and C2C_{2} each having capacitance of 10μF10\mu F are individually charged by a 100 V D.C. source. Capacitor C1C_{1} is kept connected to the source and a dielectric slab is inserted between it plates. Capacitor C2C_{2} is disconnected from the source and then a dielectric slab is inserted in it. Afterwards the capacitor C1C_{1} is also disconnected from the source and the two capacitors are finally connected in parallel combination. The common potential of the combination will be ____\_\_\_\_ VV. (Assuming Dielectric constant =10= 10 )