Gravitation — Physics STD 11 Science — Question

A square framed with a wire of side 'L' is dipped in a liquid. On taking out, a membrane is formed. What will be the force acting on the frame if the surface tension of liquid is S?

If the speed of a rod moving at a relativistic speed parallel to its length is doubled,

1. The length will become half of the original value.
2. Mass will become double of the original value.
3. The length will decrease.
4. The mass will increase.

A lift is accelerated upward. Will the apparent weight of a person inside the lift increases, decreases or remains the same relative to its real weight? If the lift is going with uniform speed, then?

Does a gas have just two specific heat capacities or more than two? Is the number of specific heat capacities of a gas countable?

Give an example of:
A constant which has no unit.

If the size of an atom is increased to the size of the sharp tip of a pin, then what will be the peak of mount everest?

Acceleration produced in a freely falling body under the gravitational pull of earth is called __________.

Under what ideal condition can the efficiency of a Carnot engine be 100%?

If a thin lens is dipped in water, does its focal length change?

What are the values of Reynolds number (N_R) for different types of flows?