The temperature of two cups of coffee are 90°C and 75°C . If the time taken for the first cup to cool from 90°C to 80°C is 15 minutes, then the time taken for the second cup to tool from 75°C to 65°C will be:
A definite amount of mechanical work is needed to produce a definite amount of heat and vice versa this given by:
Which of the following statement about the energy in a quantum is true ?
Herpetology is a branch of science which deals with.
How is the atmosphere, hydrosphere and lithosphere connected?
Which of the following acid is formed during the change of milk into curd?
