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Physics Test - 6
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Physics Test - 6
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  • Question 1/10
    1 / -0

    P and Q are like parallel forces. If P is moved parallel to itself through a distance x, then the resultant of P and Q moves through a distance:

    Solutions

  • Question 2/10
    1 / -0

    An engine pumps up 100 kg of water through a height of 10 m in 5s. Given that the efficiency of engine is 60%. If g = 10 ms-2, the power of the engine is :

    Solutions

  • Question 3/10
    1 / -0

    During projectile motion, the horizontal velocity

    Solutions

  • Question 4/10
    1 / -0

    The resultant of P and Q is R. If P is reversed, Q remains the same, the new resultant S is at right angle to R. The value of P / Q is

    Solutions

  • Question 5/10
    1 / -0

    In the circuit given below, an A.C. voltage V = 220 volt (r.m.s.) is applied. The maximum voltage across the capacitor will be

    Solutions

    The maximum voltage across the capacitor will be Vmax= Vr.m.s×= 220 ×

  • Question 6/10
    1 / -0

    For a transistor, the current gain α is 0.96. It is used as an amplifier in a common base circuit with a load resistance of 4 kΩ. If the dynamic resistance of the emitter-base junction is 48Ω, then the voltage gain is

    Solutions

  • Question 7/10
    1 / -0

    The depletion layer in a p-n junction diode is 10-6m wide and its knee potential is 0.5 V. What is the inner electric field in the depletion region?

    Solutions

    In both forward biasing and reverse biasing, applied potential establishes an internal electric field, which acts against or towards the potential barrier. This internal electric field is weakened or strengthened at the junction. In forward voltage at which the current through the junction starts to increase rapidly, once the applied forward voltage exceeds the knee voltage, the current starts increasing rapidly. In forward biasing condition, the inner electric field is given by:

  • Question 8/10
    1 / -0

    Of the diodes shown in the following diagrams, which one is reverse biased?

    Solutions

    A diode is said to be reverse biased if p-type semiconductor of p-n junction is at low potential with respect to n-type semiconductor of p-n junction. It is so for circuit (3).

  • Question 9/10
    1 / -0

    For the given circuit to act as a full-wave rectifier, the AC input should be connected across ..i... and ..ii... and the DC output should appear across ...iii... and ...iv....

    i, ii, iii and iv, respectively, are

    Solutions

    For the given circuit which is acting as a full-wave rectifier, the AC input should be connected across B and D and the DC output should appear across A and C.

  • Question 10/10
    1 / -0

    Two particles start simultaneously from the same point and move along two straight lines, one with uniform velocity  and the other from rest with uniform acceleration . Let be the angle between their directions of motion. The relative velocity of the second particle w.r.t. first is least after a time of

    Solutions

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