NSAA NSAA Physics - Thermal Physics and Thermodynamics

Question 1

What is the SI unit of temperature used in thermodynamic equations?

Accepted Answer

Kelvin (K)

Answer

The Kelvin is the SI unit of thermodynamic temperature, defined so that absolute zero is 0 K.

Question 2

The zeroth law of thermodynamics states that if object A is in thermal equilibrium with object B, and B is in thermal equilibrium with object C, then:

Accepted Answer

A and C are in thermal equilibrium with each other

Answer

The zeroth law establishes that thermal equilibrium is transitive — objects sharing a common thermal equilibrium temperature are in equilibrium with each other.

Question 3

For an ideal gas, the internal energy depends only on:

Accepted Answer

Temperature alone

Answer

For an ideal gas, intermolecular forces are neglected, so internal energy is purely kinetic and depends only on temperature.

Question 4

Which law of thermodynamics is the law of conservation of energy?

Accepted Answer

First Law

Answer

The first law states that the change in internal energy equals heat added to the system minus work done by the system (ΔU = Q − W), embodying energy conservation.

Question 5

The specific heat capacity of water is 4,200 J kg⁻¹ K⁻¹. How much energy is required to raise 2 kg of water by 5°C?

Accepted Answer

42,000 J

Answer

Using Q = mcΔT = 2 × 4,200 × 5 = 42,000 J.

NSAA - Natural Sciences Admissions Assessment Practice Test

NSAA - Natural Sciences Admissions Assessment Practice Test

NSAA NSAA Physics - Thermal Physics and Thermodynamics