All India Engineering / Architecture Entrance Examination (AIEEE)

CBSE Guess > AIEEE > AIEEE Papers > 2010 > Physics

AIEEE 2010 Physics

Q. 5. A ball is made of a material of density where with oil and water representing the densities of oil and water, respectively. The oil and water are immiscible. If the above ball is in equilibrium in a mixture of this oil and water, which of the following pictures represents its equilibrium position?

Sol:

Water must be below as and ball cannot float on oil because

Answer : (2)

Q. 6. Let be the capacitance of a capacitor discharging through a resistor R. Suppose is the time taken for the energy stored in the capacitor to reduce to half its initial value and is the time taken for the charge to reduce to one-fourth its initial value. Then the ratio will be

Sol:

As for discharging RC circuit

Answer : (3)