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Physics Test 56...

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  • Question 1
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     A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from

  • Question 2
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    A 100 V source of ac frequency 500 Hz is connected to a series LCR circuit with  L=8.1mH C=12.5μF and R=10Ω. Find different capacities across resistance.

  • Question 3
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    A current sheet where current per unit length is 6.0 A/m and direction is towards +i is placed at z=0 in the X-y plane. A current wire is located at y=0 and z=5 m. It is placed along the x axis. Find the current and its direction if Magnetic field is zero at the point P whose location is (0,0,2.5) 

  • Question 4
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    A person is holding a bucket by applying a force of 10 N. He moves a horizontal distance of 5 m and then climbs up a vertical distance of 10 m. Find the total work done by him?

  • Question 5
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    The centre of mass of three particle s of masses 1 kg,2 kg, and 3 kg is at 2,2,2. The position of the fourth mass of 4 kg to be placed in the system so that the new centre of mass is at 0,0,0 is

  • Question 6
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    In which of the following cases is no current induced in the coil with its plane perpendicular to the page as shown in the figure?

  • Question 7
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    A metal ball immersed in alcohol weight m1 at 0∘C and m2 at 150∘C. The coefficient of cubical expansion of the metal is less than that of alcohol. Assuming that the density of metal is large as compared to that alcohol it can be shown:

  • Question 8
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    Acceleration due to gravity at earth's surface is g ms−2. Find the effective value of gravity at a height of 32 km from sea level (Re=6400 km).

  • Question 9
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    Light of two different frequencies whose photons have energies 1eV and 2.5eV respectively, successively illuminate a metallic surface whose work function is 0.5eV. Ratio of maximum speeds of emitted electrons will be

  • Question 10
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    A tank is filled with water of density 1 g / cm3 and oil of density 0.9 g - cm3. The height of water layer is 100 cm and that of oil layer is 400 cm. If g = 980 cm / s2, then the velocity of efflux from an opening in the bottom of the tank will be-

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