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(A) : Stainless steel cooking pans are p...

(A) : Stainless steel cooking pans are prefered with extra copper bottom.
( R): Thermal conductivity of copper is more than that of steel

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

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A
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A copper rod of length 75 cm and an iron rod of length 125cm are joined together end to end . Both are of circular cross section with diameter 2 cm . The free ends of the copper and iron are maintained at 100^@C and 0^@C respectively . The surface of the bars are insulated thermally . The temperature of the copper -iron junction is [Thermal conductivity of the copper is 386.4 W//m-K and that of iron is 48.46W//m-K ].

Steel is preferred for making springs over copper because

(A) : When a strip made of iron and copper is heated it bends with iron on concave side. ( R) : Coefficient of linear expansion of copper is more than that of iron.

The ends of copper rod of length 1 m and area of cross section 1cm^(2) are maintained, at 0^(0)C and 100^(0)C , and steady state achieved. At the centre of rod, there is a source of heat of 25W. The thermal conductivity of copper is 400W/mK

An aluminium rod of length 1 m and a steel rod of length 2 m both having same cross-sectional area, are soldered together end-to-end. The thermal conductivity of aluminium rod and steel rod is 200 Js^(-1)m K^(-1) and 50 Js^(-1) m^(-1) K^(-1) respectively. The temperatures of the free ends are maintained at 300 K and 500 K. What is the temperature of the junction?

What is the temperature of the steel - copper junction in the steady state of the system shown in Fig.11.15. Length of the steel rod = 15.0 cm, length of the copper reod = 10.0 cm, temperarure of the furnace = 300 ^(@) C , temperature of the furnace = 300 ^(@) C , temperature of the other end = 0^(@) C . The are of cross section of the steel rod is twice that of the copper rod. ( Thermal conductivity of steel = 50.2 J s^(-1) m^(-1) K^(-1) , and of copper = 385 J s^(-1) m^(-1) K^(-1)) .

Two wires of same radius and length are subjected to the same load. One wire is of steel and the other is of copper. It the Young's modulus of steel is twice that of copper, the ratio of elastic energy stored per unit volume in steel to that of copper wire is

AAKASH SERIES-THERMAL PROPERTIES OF MATTER-EXERCISE-IB
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  2. (A) : Specific heat is known as thermal inertia. ( R) : The body hav...

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  3. (A) : Stainless steel cooking pans are prefered with extra copper bott...

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  4. (A) : Snow is a better insulator than ice ( R) : Snow contains air p...

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  8. (A) : Greater is the coefficient of thermal conductivity of a material...

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  10. (A) : Convection involves flow of matter with in a fluid due to unequa...

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  11. (A) : Winter nights are warmer when clouds cover the sky ( R) : Clou...

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  12. (A) : All black coloured objects are considered as black bodies. ( R...

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  13. (A) : 'Green houses' which are used to keep the plants in warm atmosph...

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  14. (A) : The radiation from the sun's surface varies as the fourth power ...

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  15. (A) : Animals curl into a ball, when they feel very cold. ( R) : Ani...

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  16. (A) : A body that is a good radiator is also a good absorber of radiat...

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  17. (A) : For higher temperature, the peak emission wavelength of a black ...

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  18. (A) : Temperatures near the sea coast are moderate. ( R) : Water has...

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  19. (A) : It is hotter over the top of a fire than at the same distance on...

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  20. (A) : Bodies radiate heat at all temperatures. ( R) : Rate of radiat...

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