Question

Equal volumes of water and alcohol when put in similar calorimeters take 100 sec and 74 sec respectively to cool from 50oC to 40oC. The thermal capacity of each calorimeter is numerically equal to the volume of either liquid. The specific gravity of alcohol is 0.8. If the specific heat capacity of water is 1 cal/g, the specific heat capacity of alcohol will be:

Solution

Correct option is

0.6 cal/g-oC

 

Let V cc be the volume of either liquid.

Thermal capacity of each calorimeter is V cal per oC.

Rate of cooling of water,

   

Rate of cooling of alcohol

   

Now  -oC

SIMILAR QUESTIONS

Q1

For an adiabatic expansion of a perfect gas, the value of  is equal to:

Q2

In an adiabatic expansion of a gas, the product of pressure and volume:

Q3

One of the most efficient engines ever developed operates between 2100 K and 700 K. Its actual efficiency is 40%. What percentage of its maximum possible efficiency is this?

Q4

In an adiabatic change, the pressure P and temperature  of a diatomic gas are related by the relation   where equals:

Q5

By opening the door of a refrigerator inside a closed room:

Q6

One mole of an ideal mono-atomic gas is heated at a constant pressure of one atmosphere from 0oC to 100oC. Then the change in the internal energy is:

Q7

One mole of an ideal mono-atomic gas is heated at a constant pressure of one atmosphere from 0oC to 100oC. The work done by the gas is:

Q8

One mole of an ideal mono-atomic gas is heated at a constant pressure of one atmosphere from 0oC to 100oC. The heat taken from the source is:

Q9

Three moles of an ideal mono-atomic gas perform a cycle as shown in figure. The gas temperatures in different states are  The work done by the gas during the cycle will be:

                                                           

Q10

During an adiabatic process at constant pressure, the temperature and volume of a gas are found to vary according to the relation TV0.4 constant. The gas should be: