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When boiling water is poured in a glass beaker, sometimes the beaker cracks. The property of glass responsible for cracking is:

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Important Questions on Thermal Conduction

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11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 9

The most appropriate material for a cooking pot is the one having:

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ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 10

One end of a thermally insulated rod is kept at a temperature $T_{1}$ , and the other at $T_{2}$ . The rod is composed of two sections of lengths $l_{1}$ and $l_{2}$ and thermal conductivities $K_{1}$ and $K_{2}$ respectively. The temperature at the interface of the two sections is:

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ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 11

A wall is made of two equally thick layers

A

and

B

of different materials. The thermal conductivity of

A

is twice that of

B

. In the steady state, the temperature difference across the wall is

36 ° C

. The temperature difference across the layer

A

will be:

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ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 12

A long metallic bar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature

θ

along the length

x

of the bar from its hot end is best described by which of the following graphs?

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ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 13

Three rods of copper, brass and steel are welded together to form

Y

-shaped structure. Area of cross- section of each rod

4 {cm}^{2}

. End of copper rod is maintained at

100 ° C

where as ends of brass and steel are kept at

0 ° C

. Lengths of the copper, brass and steel rods are

46

13

and

12 cm

respectively. The rods are thermally insulated from surroundings except at ends. Thermal conductivities of copper, brass and steel are

0.92

0.26

and

0.12

CGS units respectively. Rate of heat flow through copper rod is:

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ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 14

One end of a copper rod of length

1.0 m

and area of cross-section

10^{- 3} m^{2}

is immersed in boiling water and the other end in ice. If the coefficient of thermal conductivity of copper is

92 cal m^{- 1} ° C^{- 1}

and the latent heat of ice is

8 \times 10^{4} cal {kg}^{- 1}

, then the amount of ice which will melt in one minute is:

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ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 15

Two identical metal rods are connected in parallel between two vessels, one containing water at

100 ° C

and the other containing ice at

0 ° C

. Ice melts at a rate

q_{1} g m s^{- 1}

. When the rods are joined end to end and connected to the same vessels, the rate of melting of ice is

q_{2} g m s^{- 1}

. The ratio

\frac{q_{1}}{q_{2}}

is:

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11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 16

A composite block is made of slabs $A$ , $B$ , $C$ , $D$ and $E$ of different thermal conductivities (given in terms of a constant $K$ ) and sizes (given in terms of length, $L$ ) as shown in the figure. All slabs are of same width. Heat $Q$ flows only from left to right through the blocks. Then, in steady state:

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When boiling water is poured in a glass beaker, sometimes the beaker cracks. The property of glass responsible for cracking is:

Important Questions on Thermal Conduction

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