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Gokul Radhakrishnan

Gokul R.

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Kamlesh Goyal verified

Numerade educator

Two identical rods of copper and iron are coated with wax uniformly. When one end of each is kept at temperature of boiling water, the length upto which wax melts are 8.4cm and 4.2cm respectively. If thermal conductivity of copper is 0.92, then thermal conductivity of iron is (a) 0.23 (b) 0.46 (c) 0.115 (d) 0.69

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Kamlesh Goyal verified

Numerade educator

The ratio of the diameters of two metallic rods of the same material is 2 : 1 and their lengths are in the ratio 1 : 4. If the temperature difference between their ends are equal, the rate of flow of heat in them will be in the ratio(a) 2 : 1 (b) 4 : 1 (c) 8 : 1 (d) 16 : 1

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Kamlesh Goyal verified

Numerade educator

The quantity of heat which crosses unit area of a metal plate during conduction depends upon (a) The density of the metal (b) The temperature gradient perpendicular to the area (c) The temperature to which the metal is heated (d) The area of the metal plate

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Kamlesh Goyal verified

Numerade educator

If the radius and length of a copper rod are both doubled, the rate of flow of heat along the rod increases (a) 4 times (b) 2 times (c) 8 times (d) 16 times

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Kamlesh Goyal verified

Numerade educator

Wires A and B have identical lengths and have circular crosssections. The radius of A is twice the radius of B i.e. r A= 2rB . For a given temperature difference between the two ends, both wires conduct heat at the same rate. The relation between the thermal conductivities is given by equation?

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Kamlesh Goyal verified

Numerade educator

On heating one end of a rod, the temperature of whole rod will be uniform when (a) K = 1 (b) K = 0 (c) K = 100 (d) K = infinity

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Kamlesh Goyal verified

Numerade educator

The temperature gradient in a rod of 0.5 m long is 80. If the temperature of hotter end of the rod is 30 , then the temperature of the cooler end is ?

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Kamlesh Goyal verified

Numerade educator

The thickness of a metallic plate is 0.4 cm. The temperature between its two surfaces is 20 . The quantity of heat flowing per second is 50 calories from 5cm^2 area. In CGS system, the coefficient of thermal conductivity will be (a) 0.4 (b) 0.6 (c) 0.2 (d) 0.5

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Kamlesh Goyal verified

Numerade educator

If the ratio of coefficient of thermal conductivity of silver and copper is 10 : 9, then the ratio of the lengths upto which wax will melt in Ingen Hausz experiment will be (a) 6 : 10 (b) 10^0.5 : 3 (c) 100 : 81 (d) 81 : 100

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Kamlesh Goyal verified

Numerade educator

In variable state, the rate of flow of heat is controlled by (a) Density of material (b) Specific heat (c) Thermal conductivity (d) All the above factors

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