11 PHYSICS UNIT 8 EM

In hot summer after a bath, the body’s

• internal energy decreases

• internal energy increases

• heat decreases

• no changes in internal energy and heat

The graph between volume and temperature in Charles’ law is

• an ellipse

• a circle

• a straight line

• a parabola

When a cycle tyre suddenly bursts, the air inside the tyre expands. This process is

• isothermal

• adiabatic

• isobaric

• isochoric

An ideal gas passes from one equilibrium state (P₁, V₁, T₁, N) to another equilibrium state (2P₁, 3V₁, T₂, N). Then

• T₁ = T₂

• T₁ = T₂/6

• T₁ = 6T₂

• T₁ = 3T₂

When a uniform rod is heated, which of the following quantity of the rod will increase

• mass

• weight

• center of mass

• moment of inertia

When food is cooked in a vessel by keeping the lid closed, after some time the steam pushes the lid outward. Bu considering the steam as a thermodynamic system, then in the cooking process

• Q > 0, W > 0,

• Q < 0, W > 0,

• Q > 0, W < 0,

• Q < 0, W < 0,

When you exercise in the morning, by considering your body as thermodynamic system, which of the following is true?

• ΔU > 0, W > 0,

• ΔU < 0, W > 0,

• ΔU < 0, W < 0,

• ΔU = 0, W > 0,

An ideal gas is taken from (Pi, Vi) to (Pf, Vf) in three different ways. Identify the process in which the work done on the gas the most.

• Process A

• Process B

• Process C

• Equal work is done in process A,B& C

A hot cup of coffee is kept on the table. After some time it attains a thermal equilibrium with the surroundings. By considering the air molecules in the room as a thermodynamic system, which of the following is true

• ΔU > 0, Q = 0,

• ΔU > 0, W < 0,

• ΔU > 0, Q > 0,

• ΔU = 0, Q > 0,

The V - T diagram of a ideal gas which goes through a reversible cycle A →B→C→D

is shown below. (Processes D→A and B→C are adiabatic)

The corresponding PV diagram for the process is (all figures are schematic)

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