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Day 214: JEE Mains Physics

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

  1. Question 1

    Semiconductor Electronics. Asked once: 27 Jul 2022 (same type asked 3 times) See all 3 of this type

    109
    For a constant collector-emitter voltage of 8 V8\text{ }V, the collector current of a transistor reached to the value of 6 mA6\text{ }mA from 4 mA4\text{ }mA, whereas base current changed from 20μA20\mu A to 25μA25\mu A value. If transistor is in active state, small signal current gain (current amplification factor) will be:

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  2. Question 2

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

    105
    Let η1\eta_{1} is the efficiency of an engine at T1=447∘CT_{1}=447^{\circ}C and T2=147∘CT_{2}=147^{\circ}C while η2\eta_{2} is the efficiency at T1=947∘CT_{1}=947^{\circ}C and T2=47∘CT_{2}=47^{\circ}C. The ratio η1η2\frac{\eta_{1}}{\eta_{2}} will be:

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  3. Question 3

    Electromagnetic Induction. Asked once: 10 Apr 2023 (same type asked 3 times) See all 3 of this type

    110
    A bar magnet is released from rest along the axis of a very long vertical copper tube. After some time, the magnet will

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  4. Question 4

    Electromagnetic Induction. Asked once: 8 Apr 2023 (same type asked 3 times) See all 3 of this type

    108
    An emf of 0.08 V0.08\text{ }V is induced in a metal rod of length 10 cm10\text{ }cm held normal to a uniform magnetic field of 0.4 T0.4\text{ }T, when moves with a velocity of:

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  5. Question 5

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

    29
    The current in a coil of self- inductance 2.0H2.0H is increasing according to I=2sin⁡(t2)AI= 2\sin\left( t^{2} \right)A. The amount of energy spent during the period when current changes from 0 to 2 A2\text{ }A is ____\_\_\_\_ J.