Physics Crash Course NDA & NA EE>Chapter 14 - Heat Transfer>Exercise 1>Q 21

EASY

NDA & NA EE

IMPORTANT

Earn 100

If a piece of metal is heated to temperature $θ$ and then allowed to cool in a room which is at temperature $θ_{0}$ , the graph between the temperature $T$ of the metal and time $t$ will be closest to :

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Important Questions on Heat Transfer

EASY

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 14 - Heat Transfer>Exercise 1>Q 22

A metallic sphere cools from

50 ° C

to

40 ° C

in

300 s

. If atmospheric temperature around is

20 ° C

, then the sphere's temperature after the nest

5

minutes will be close to:

EASY

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 14 - Heat Transfer>Exercise 1>Q 23

A body cools from

70 ° C

to

40 ° C

in

5

minutes. Calculate the time it takes to cool from

60 ° C

to

30 ° C

. The temperature of the surroundings is

20 ° C

.

EASY

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 14 - Heat Transfer>Exercise 1>Q 24

Newton's law of cooling is used in laboratory for the determination of the

MEDIUM

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 14 - Heat Transfer>Exercise 1>Q 25

According to Newton's law of cooling, the rate of cooling of a body is proportional to: