Question

1. the si unit of entropy is

(a) °c
(b) °f
(c) pascal
(d) j/k
(e) none of the above

1. the si unit for heat is

(a) joule per kelvin
(b) pascal
(c) meter per second
(d) calorie
(e) none of the above

1. the higher the frequency of a wave, the

(a) shorter the wavelength.
(b) longer the wavelength.
(c) neither of these

Explanation:

• Question 10: Entropy ($S$) is related to heat ($Q$) and temperature ($T$) by the formula $dS=\frac{dQ}{T}$. The SI unit of heat ($Q$) is Joule ($J$) and the SI unit of temperature ($T$) is Kelvin ($K$). So, the SI unit of entropy is $J/K$.
• Question 11: The SI unit of heat is Joule ($J$). Calorie is a non - SI unit of heat, $J/K$ is the unit of entropy, Pascal is the unit of pressure, and meter per second is the unit of velocity.
• Question 12: The relationship between the speed of a wave ($v$), its frequency ($f$), and wavelength ($\lambda$) is $v = f\lambda$. For a wave in a given medium (where $v$ is constant), if $f$ increases, $\lambda=\frac{v}{f}$ decreases.

Answer:

1. d. $J/K$
2. e. none of the above
3. a. shorter the wavelength