2. A parallel plate air capacitor of capacitance 2.45 pF has a charge of magnitude o.148 �C on each plate. Find the potential difference and electric field intensity between the plates if the distance between the plates is 5mm?
3. Obtain the value of g from the motion of moon assuming that its period of rotation round the earth is 27 days 8 hours and the radius of its orbit is 60.1 times the radius of the earth. Radius of earth = 6.36�106 m.
4. A simple pendulum 4 m long swings with an amplitude of 0.2 m. compute the velocity of the pendulum at its lowest point and its acceleration at the extreme ends.
5. Angle of contact of mercury with glass is 135�. A narrow tube of glass having diameter 2mm is dipped in a beaker containing mercury. By what height does the mercury go down in the tube relative to the level of mercury outside? Surface tension of mercury = 0.547 Nm-1 , Density of mercury = 13600 kgm-3
6. The correct inflation of a tyre at 20� C is 2 kg/cm2. After driving several hours, the driver checks the tryes. If the tyre�s temperature is 50�C, what should be the pressure reading?
7. If earth shrinks, how will be the duration of a day affected?
8. A body floats in a liquid contained in a beaker. The whole system falls under gravity. What is the value of upthrust on the body due to liquid?
9. A student claimed that thermometers are useless because a thermometer always registers its own temperature. How would you respond?
10. Why do we feel uncomfortable during very high relative humidity of air?
11. Why does a refrigerator consume more power in summer than in winter to cool the same quantity of food by same degree?
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