What is the correct answer?


A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.

A. 370

B. 340

C. 320

D. 300

Correct Answer :

A. 370

Related Questions

The majority charge carriers in p-type silicon are Consider an ideal solution of components A and B. The entropy of mixing… According to thermodynamic Fahrenheit scale, the fundamental interval… Parallel straight line pattern of temperature distribution for both hot… Thermit welding is categorised as the __________ welding. Large diameter reinforced cement concrete (RCC) pipes are generally joined… The type of pump used for lifting large quantity of sewage is a __________… __________ has the highest melting point out of the following. 'Ice point' is designated on Fahrenheit temperature scale by The swift cup test evaluates the following property of a sheet metal. __________ pipe is the most suitable for carrying sanitary drainage. The most detrimental impurity in high pressure boiler feed water is Pick out the wrong statement. Which of the following is the most suitable abrasive for grinding high… Square steel key is normally strong in failure by shear & crushing. Keys… Midrex process of sponge iron production uses reformed natural gas as… __________ cannot increase the fatigue strength of a material. Most of the phosphorous present in the blast furnace burden enters into Colour comparator is used to measure the A gas which is collected over water becomes moistened due to water vapor,… Liquor poisoning generally occurs due to the presence of __________ in… Yield strength of a material is determined by the __________ test. For preparation of porous bearings by powder metallurgy, preferred particle… In the blast furnace, incorporation of water vapour in the blast gives… __________ number determines whether the fluid flow in an open channel… The Al2O3 content of cryolite in Hall- Heroult cell is maintained between… For infinite parallel planes having emissivities ε1 & ε2, the… Cold chisels hammers are made of The mechanism involved in the removal of metal in drilling operation is… __________ is a special constituent of chlorophyll without which photosynthesis…