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Physics Test 104
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Physics Test 104

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  • Question 1/10
    4 / -1

    A sound has intensity of 2 × 10–8 W/m2. Its intensity level (in decibel) is : (log10 2 = 0.3)

    Solutions

    L = 10 log10 (2 × 104)

    = 10 [log102 + log10 (104)]

    = 10 × 4.3 = 43 dB

     

  • Question 2/10
    4 / -1

    A body is moving forward and backward. Change in frequency observed by the body of a stationary source is 2%. What is velocity of the body ? (Vsound = 300 m/s)

    Solutions

     

  • Question 3/10
    4 / -1

    The displacement-time graphs for two sound wave A and B are shown in the figure, then the ratio of their intensities.

    Solutions

     

  • Question 4/10
    4 / -1

    In a semiconductor if 

    Solutions

     

  • Question 5/10
    4 / -1

    When p-n junction is forward biased then :-

  • Question 6/10
    4 / -1

    Directions For Questions

    In the given circuit

    ...view full instructions

    The current through the battery is

    Solutions

     

  • Question 7/10
    4 / -1

    In the given circuit, current through the zener diode is :-

    Solutions

     

  • Question 8/10
    4 / -1

    In an n-p-n transistor circuit, the collector current is 10 mA. If 90% of the electrons emitted reach the collector.

    Solutions

    Since IE = IB + IC. Therefore IB = IE - IC

     

  • Question 9/10
    4 / -1

    To get an output 1 from the circuit shown in the figure, the input must be :-

  • Question 10/10
    4 / -1

    Ohm's law does not hold good for :-

    Solutions

    Ohm's law does not hold good for N-P-N transistor and diode.

     

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