# A spherical drop of capacitance 1μF is broken into eight drops of equal radius. Then, the capacitance of each small drop is 1.   μF 2.   μF 3.   μF 4.  8 μF

Subtopic:  Capacitance |
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A simple harmonic oscillator consists of a particle of mass m, and an ideal spring with spring constantk. The particle oscillates with a time period T. The spring is cut into two equal parts, Of one part oscillates with the same particles, the time period will

1.  2T

The coefficient of viscosity for hot air is

1.  greater than the coefficient of viscosity for cold air

2.  smaller than the coefficient of viscosity for cold air

3.  same than the coefficient of viscosity for cold air

4.  increase than the coefficient of viscosity for cold air

Subtopic:  Viscosity |
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An artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) energyE0. Its potential energy is
1.  -E0

Subtopic:  Satellite |
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A thin hollow sphere of mass m is completely filled with a liquid of mass m. When the sphere rolls with a velocity v, kinetic energy of the system is (neglect friction)

1.  mv2

A non-conducting body floats in a liquid at 20 °C with of its volume immersed in the liquid. When liquid temperature is increased to 100 °C, of body’s volume is immersed in the liquid. Then the coefficient of real expansion of the liquid is (neglecting the expansion of container of the liquid)

Two slabs A and B of different materials but of the same thickness are joined end to end to form a composite slab. The thermal conductivities of A and B are K1 and K2 respectively. A steady temperature difference of 12 °C is maintained across the composite slab. If K1 = , the temperature difference across slabs A is

1.  4 °C

In short wave communication, waves of which of following frequencies will be reflected back by the ionospheric layer having electron density 1011 per m3?

1.  2 MHz

A body of mass 4 kg moving with velocity 12 m/s collides with another body of mass 6 kg at rest. If two bodies stick together after collision, then the loss of kinetic energy of system is

1.  zero

A marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped by friction in 10 s. Then the coefficient of friction is

1.  0.01

2.  0.02

3.  0.03

4.  0.06
Subtopic:  Friction |
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