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Two identical square rods of metal are w...

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

A

`0.75 min`

B

`0.5 min`

C

`1.5 min`

D

`1 min`

Text Solution

Verified by Experts

The correct Answer is:
B
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MOTION-HEAT - 1-EXERCISE - 1 Objective Problems | JEE Main
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  2. Two metal cubes with 3 cm-edges of copper and aluminium are arranged a...

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  3. Two identical square rods of metal are welded end to end as shown in f...

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  4. A wall consists of alternating blocks withlength 'd' and coefficient o...

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  5. A cylinder of radius R made of a material of thermal conductivity K1 i...

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  6. From a black body, radiation is not :

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  7. In accordance with Kirchhoff’s law. Which of the following is incorrec...

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  8. The energy radiated by a body does not depends on

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  9. A polished metallic piece and a black painted wooden piece are kept i...

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  10. Nature of thermal radiations is similar to the nature of -

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  11. Heat radiation exhibit the phenomenon of polarization which means that...

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  12. Following is not a property of radiation –

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  13. Transfer of heat in friction is by –

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  14. Which of the following surface will emit least heat radiation –

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  15. Emissive power of any surface (e), Absorptive power (a), Reflecting po...

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  16. A black metal foil is warmed by radiation from a small sphere at tempe...

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  17. Two bodies P and Q have thermal emissivities of varepsilon(P) and vare...

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  18. The rate of emission of radiation of a black body at 273^(@)C is E, th...

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  19. The power radiated by a black body is P, and it radiates maximum energ...

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  20. Spheres P and Q are uniformally constructed from the same material whi...

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