PART - 2 CH - 14 Waves — Physics STD 11 Science — Question

A steel ball and a rubber ball of equal weight are dropped from the same height on a firm surface then:

A spring balance is graduated on sea level. If a body is weighed with this balance at consecutively increasing heights from earth's surface, the weight indicated by the balance

Figure shows a siphon. The liquid shown is water. The pressure difference P_a P_A between the points A and B is the reading will be:

1. 400 Nm⁻²
2. 3000 Nm⁻²
3. 1000 Nm⁻²
4. zero.

A ball hits a floor and rebounds after an inelastic collision. In this case:

1. The momentum of the ball just after the collision is same as that just before the collision.
2. The mechanical energy of the ball remains the same during the collision.
3. The total momentum of the ball and the earth is conserved.
4. The total energy of the ball and the earth remains the same.

Consider a cycle followed by an engine:

1 to 2 is isothermal.

2 to 3 is adiabatic.

3 to 1 is adiabatic.

Such a process does not exist because:

1. heat is completely converted to mechanical energy in such a process, which is not possible.
2. mechanical energy is completely converted to heat in this process, which is not possible.
3. curves representing two adiabatic processes don’t intersect.
4. curves representing an adiabatic process and an isothermal process don’t intersect.

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The elastic limit for a gas