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Day 124: JEE Mains Physics

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

  1. Question 1

    Nuclei. This type asked 2 times: 5 Apr 2024, 9 Apr 2024. This one: 9 Apr 2024 See all 2 of this type

    23
    A star has 100%100\% helium composition. It starts to convert three  4He\ ^{4}He into one  12C\ ^{12}C via triple alpha process as  4He+ 4He+ 4He→ 12C+Q\ ^{4}He +\ ^{4}He +\ ^{4}He \rightarrow\ ^{12}C + Q. The mass of the star is 2.0×1032 kg2.0 \times10^{32}\text{ }kg and it generates energy at the rate of 5.808×1030 W5.808 \times10^{30}\text{ }W. The rate of converting these  4He\ ^{4}He to  12C\ ^{12}C is n×1042 s−1n \times10^{42}{\text{ }s}^{- 1}, where nn is ________ . [Take, mass of  4He=4.0026u\ ^{4}He = 4.0026u, mass of  12C=12u\ ^{12}C = 12u ]

  2. Question 2

    Nuclei. This type asked 2 times: 8 Apr 2024, 9 Apr 2024. This one: 9 Apr 2024 See all 2 of this type

    11
    The energy equivalent of 1 g1\text{ }g of substance is:

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  3. Question 3

    System of Particles and Rotational Motion. This type asked 2 times: 8 Apr 2024, 9 Apr 2024. This one: 9 Apr 2024 See all 2 of this type

    91
    A nucleus at rest disintegrates into two smaller nuclei with their masses in the ratio of 2:12:1. After disintegration they will move: -

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  4. Question 4

    Alternating Current. This type asked 2 times: 27 Jul 2022, 8 Apr 2024. This one: 8 Apr 2024 See all 2 of this type

    105
    A coil of negligible resistance is connected in series with 90Ω90\Omega resistor across 120 V,60 Hz120\text{ }V,60\text{ }Hz supply. A voltmeter reads 36 V36\text{ }V across resistance. Inductance of the coil is:

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  5. Question 5

    Magnetism and Matter. This type asked 2 times: 10 Apr 2023, 8 Apr 2024. This one: 8 Apr 2024 See all 2 of this type

    111
    The coercivity of a magnet is 5×103 A/m5 \times10^{3}\text{ }A/m. The amount of current required to be passed in a solenoid of length 30 cm30\text{ }cm and the number of turns 150, so that the magnet gets demagnetised when inside the solenoid is _____ A.