ISRO 2023 Quiz 45 Revision

In a certain code language, ‘+’ represents ‘-‘, ‘-‘ represents ‘×’, ‘×’ represents ‘÷‘ and ‘÷‘ represents ‘+’. Find out the answer to the following question.

100 × 5 + 15 – 12 ÷ 6 = ?

Consider a Carnot refrigerator working between . Calculate the work requirement, If the refrigerator receives  of heat

For a definite ideal refrigeration cycle, the COP of heat pump is found out to be . For a situation in which the cycle, under the very condition running as heat engine will have efficiency to be:

In case carburizing, carbon is introduced to form high carbon layer at the surface. The carbon is introduced in the form of

In a temperature-time diagram (TTT diagram), the time scale is _____.