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The coefficient of thermal conductivity of a metal depends on:

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Important Questions on Heat Transfer

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Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-1>Q 14

Two identical square rods of metal are welded end to end as shown in figure $(1)$ . Assume that $10 cal$ of heat flows through the rods in $2 \min .$ Now the rods are welded as shown in figure $(2) .$ The time it would take for $10 cal$ to flow through the rods now, is

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Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-1>Q 15

Area of cross-section of two rods of equal lengths are

A_{1}

and

A_{2}

and thermal conductivities are

K_{1}

and

K_{2} .

Specific heats are

S_{1}

and

S_{2} .

Condition for equal heat flow is-

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Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-1>Q 16

If two metallic plates of equal thickness, equal cross-section area and thermal conductivities

K_{1}

and

K_{2}

are put together face to face (series combination) and a common plate is constructed, then the equivalent thermal conductivity of this plate will be-

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Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-1>Q 17

Consider a compound slab consisting of two different materials having equal thicknesses, equal cross-section area and thermal conductivities

k

and

2 k

respectively. If they are connected in series combination, the equivalent thermal conductivity of the slab is-

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Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-1>Q 20

Three rods made of the same material and having the same cross-section are joined as shown in the figure. Each rod is of same length. The left and right ends are kept at $0 ° C$ and $90 ° C$ , respectively. The temperature of the junction of the three rods will be:

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Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-1>Q 21

Two containers, one is having ice at

0 ° C

and the other containing boiling water at

100 ° C

are connected by two identical rods. When rods are in parallel the rate of heat transfer is

Q_{1}

and when rods are in series, the rate of heat transfer is

Q_{2} .

Then

\frac{Q_{2}}{Q_{1}}

will be:

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Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-1>Q 22

If the temperature difference on the two sides of a wall increases from $100 ° C$ to $200 ° C,$ its thermal conductivity

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Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-1>Q 23

A cylindrical rod having temperature

T_{1}

and

T_{2}

at its ends. The rate of flow of heat is

Q_{1}

$cal \sec^{- 1}$ . If all the linear dimensions are doubled keeping the temperature constant then the rate of flow of heat

Q_{2}

will be

The coefficient of thermal conductivity of a metal depends on:

Important Questions on Heat Transfer

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