THERMODYNAMICS

1 )

A difference of temperature of 25°Cis equivalent to a difference of

72° F

45° F

32° F

25° F

View Solution

Answer :

[(Δc) / (100°)] = [(ΔF) / (180°)]

given : Δc = 25°C

∴ [(25) / (100)] = [(ΔF) / (180°)]

∴ Δ F = [(180) / 4] = 45°F

2 )

What is the value of absolute temperature on the Celsius Scale?

– 273.15°C

100° C

– 32° C

0° C

View Solution

Answer :

Absolute zero on celcius scale = – 273.15° C

3 )

The temperature of a substance increases by 27°C What is the value of this increase of Kelvin scale?

300K

270 K

27 K

7 K

View Solution

Answer :

Temperature increases by 27°C. on Kelvin scale increment will be same.

Hence value of increase is 27K

4 )

At Which temperature the density of water is maximum?

32° F

30° F

39.2° F

42° F

View Solution

Answer :

Density of water is maximum at 4°C

(C/5) = [(F – 32) / 9]

∴ (4/5) = [(F – 32) / 9]

∴ F = 39.2° F

5 )

The graph AB Shown in figure is a plot of a temperature of a body in degree Fahrenheit than slope of line AB is

(5 / 9)

(9 / 5)

(1 / 9)

(3 / 9)

View Solution

Answer :

Slope of BC = [(Y₂ – Y₁) / (X₂ – X₁)]

= [(100 – 0) / (212 – 32)]

= [(100) / (180)] = (5/9)

i.e slope of AB = slope of BC = (5/9)

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