PART - 1 CH - 5Work, Energy and Power — Physics STD 11 Science — Question

A glass plate of length 10cm, breadth 4cm and thickness 0.4cm weighs 20g in air. It is held vertically with long side horizontal and half the plate immersed in water. What will be its apparent weight? Surface tension of water = 70 dyne/cm.

If the oscillation amplitude of a simple pendulum is reduced to half of its present value, then what will be the value of its time period?

The outer rail of a curved railway track is generally raised over the inner. Why?

What would be the effect on rms velocity of gas molecules, if the temperature of the gas is increased by a factor 4?

If the sum of all the forces acting on a body is zero, is it necessarily in equilibrium? If the sum of all the forces on a particle is zero, is it necessarily in equilibrium?

What velocity will you give to a donkey and what velocity to a monkey so that both escape the gravitational field of the earth?

A gas is kept in a rigid cubical container. If a load of 10kg is put on the top of the container, does the pressure increase?

How the gravitational field at a point inside a solid sphere vary with distance x from its centre, if x <R and x > R (R-radius)?

A disc of wax is melted and molded into a solid sphere. What will be the effect on the moment of inertia about the common axis passing through the centre?