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Physics Test - ...

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  • Question 1
    1 / -0

    An external force of 40 N is acting on a wooden block moving on a rough surface with a constant velocity of 2 m/s. Find the friction force on the block.

  • Question 2
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    A small square loop of wire of side \(l\) is placed inside a large square loop of wire of side \(L(L>>l)\). The loops are coplanar and their centers coincide. The mutual inductance of the system is proportional to:

  • Question 3
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    A mass of \(5 \mathrm{~kg}\) is suspended from a spring of stiffness \(4000 \mathrm{~N} / \mathrm{m}\). The system is fitted with a damper with a damping ratio of \(0.2\). The mass is pulled down 50 \(\mathrm{mm}\) and then released. Calculate the damped frequency.

  • Question 4
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    Why does mercury not evaporate at room temperature?

  • Question 5
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    Current sensitivity of a moving coil galvanometer is \(5\) div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is \(20\) div/V. The resistance of the galvanometer is

  • Question 6
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    In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction?

  • Question 7
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    A series LCR circuit is connected to an ac voltage source. When \(\mathrm{L}\) is removed from the circuit, the phase difference between current and voltage is \(\frac{\pi}{3} .\) If instead \(\mathrm{C}\) is removed from the circuit, the phase difference is again \(\frac{\pi}{3}\) between current and voltage. The power factor of the circuit is:

  • Question 8
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    In a double-slit experiment, when the light of wavelength \(400 ~{nm}\) was used, the angular width of the first minima formed on a screen placed \(1 {~m}\) away, was found to be \(0.2^{\circ} .\) What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water? ( \(\left.\mu_{\text {water }}=\frac{4}{3}\right)\)

  • Question 9
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    Which of the following method is used exclusively in fluid mechanics?

  • Question 10
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    An electron of mass m and a photon have the same energy E. The ratio of de-Broglie wavelength associated with them is:

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