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Physics Test-20...

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  • Question 1
    4 / -1

    The activity of radioactive sample is measured as \(9750\) counts per minute at \(t=0\) and as \(975\) counts per minute at \({t}=5\) minutes, the decay constant is approximately:

  • Question 2
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    The angular momentum of a particle performing uniform circular motion is L. If the kinetic energy of the particle is doubled and frequency is halved, then angular momentum becomes:

  • Question 3
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    What would be the escape velocity (in km/s) from a planet of mass\(\frac{1}{4}\)th of mass of earth and radius \(\frac{1}{9}\)th the radius of the earth, if escape velocity from the earth is 11 km/s?

  • Question 4
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    What is the effect on the interference fringes in Young's double slit experiment if the width of the source slit is increased?

  • Question 5
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    If \(1 \) L of gas A at \(600\) torr and \(500 \) mL of gas B at \(1000\) torr are placed in \(2\) L flask, the final pressure will be:

  • Question 6
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    The current in the toroid of average radius r and number of turns N is I, then magnetic field intensity B inside the toroid is related to the average radius r as:

  • Question 7
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    An ideal refrigerator has a freezer at a temperature of \(-13^{\circ} C\).The coefficient of performance of the engine is \(5\). The temperature at which heat is rejected will be:

  • Question 8
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    According to Wien's law, the wavelength corresponding to maximum energy is inversely proportional to _________.

  • Question 9
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    Which of the following is a crystalline solid?

  • Question 10
    4 / -1

    Active power and apparent power are respectively measured in:

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