Molecular Physics | Thermodynamics Answers

The ice and steam points on a thermometer correspond to X and 50mm respectively. A temperature of 60degree celcius corresponds to 52mm on the thermometer. Calculate the value of X

Determine the quantity of heat conducted in thirty minutes through an iron plate 2.0 cm thick and 0.10m^2 in area if the temperatures of the two sides are 0 Degrees Celsius and 20 Degrees Celsius. The coefficient of thermal conductivity of iron is 50.4 J/smC.

(A) 9.1 X 10^6J

(B) 2.3 X 10^6J

(C) 4.1 X 10^6J

(D) 3.3 X 10^6J

One end of a 30cm long aluminum rod is exposed to a temperature of 500 Degrees Celsius while the other end is maintained at 20 Degrees Celsius. The rod has the diameter of 2.5 cm. If heat is conducted through the rod at the rate of 164.9J/s, calculate the the thermal conductivity of aluminum.

(A) 311.6 W/mC

(B) 209.9W/mC

(C) 506.3W/mC

(D) 457.1W/mC

A piece of plastic barely floats in water. If it has a mass of 20g, what is its volume?

(A) 30cm^3

(B) 20cm^3

(C) 10cm^3

(D) 2cm^3

A certain resistance thermometer at triple point of water has resistance of 152.0 Ohms. What is the temperature of the system in Degrees Celsius when the resistance of the thermometer is 230.51 Ohms ?

(A) 414.2 Degrees Celsius

(B) 141.0 Degrees Celsius

(C) 253.2 Degrees Celsius

(D) 80.4 Degrees Celsius

The temperature at which the tungsten filament of a 12V and 36W lamp operates is 1730 Degrees Celsius. If the temperature coefficient of resistance of tungsten is 610^−3/K, find the resistance of the lamp at a room temperature of 20 Degrees Celsius.

(A) 10.00 ohms

(B) 0.45 ohms

(C) 0.39 ohms

(D) 4.00 ohms

A scientist uses a scale Y for measuring temperature. In this scale, pure water melts at 10 Degrees Y and boils at 130 Degrees Y at standard atmospheric pressure. The scientist measures the temperature at which sodium melts to be 127 Degrees Y. Express this temperature in degrees Celsius.

(A) 97.5 Degrees Celsius
(B) 102.6 Degrees Celsius
(C) 38.6 Degrees Celsius
(D) 196.6 Degrees Celsius

The molecules of a liquid are held together by what type of forces?

In which of the following phenomena is surface tension important?
the floating of a boat in water
the floating of a steel wire in water
the floating of a ballon in air
the floating of a plastic sphere in water

Which of the following substances has the highest viscosity at room temperature?
Water
kerosine
palm oil
alcohol