Equal masses of water at 20 degrees C and 60 degrees C are mixed with no heat lost. The final temperature is:
A30 degrees C
B35 degrees C
C40 degrees C
D45 degrees C
Answer & Solution
Correct answer: C. 40 degrees C
Equal masses of the same liquid settle at the average, (20 + 60) / 2 = 40 degrees C.
Keep practising Heat
Browse all Heat questions for Olympiad (Class 7), or explore more Science topics.
Related questions
Some solar water heaters move hot water upward without a pump by:Thick mud walls keep a hut cooler in summer mainly because mud is a:An ice cube melts in your hand because heat flows:While measuring the temperature of hot water, the laboratory thermometer should be held:When a 90 degrees C block touches a 10 degrees C block, the hotter block's temperature wilHeat is a form of:Normal body temperature on the Fahrenheit scale is nearly:The bottoms of cooking vessels are often blackened with soot because black surfaces: