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Physics Test 60...

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  • Question 1
    4 / -1

    A radioactive nucleus (initial mass number A and atomic number Z) emits 3 α− particles and 2 positrons. The ratio of number of neutrons to that of protons in the final nucleus will be

  • Question 2
    4 / -1

    A diatomic ideal gas is used in a Car engine as the working substance. If during the adiabatic expansion part of the cycle, volume of the gas increases from V to 32V the efficiency of the engine is

  • Question 3
    4 / -1

    If a source of power 4 kW produces 1020 photons/second, the radiation belong to a part of the spectrum called

  • Question 4
    4 / -1

    The respective number of significant figures for the numbers 23.023, 0.0003 and 2.1 × 10−3 are

  • Question 5
    4 / -1

    In a series LCR circuit R=200Ω and the voltage and the frequency of the main supply is 220 V and 50 Hz respectively. On taking out the capacitance from the circuit the current lags behind the voltage by 30∘. On taking out the inductor from the circuit the current leads the voltage by 30∘. The power dissipated in the LCR circuit is

  • Question 6
    4 / -1

    In a transistor circuit, the collector current is 50 mA and the base current is 1 mA. The current gain α is

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