Mud houses are cooler in the summer and warmer in the winter because:

1. the mud is a superconductor of heat.
2. the mud is a good conductor of heat.
3. the mud is a bad conductor of heat.
4. None of the above

Subtopic:  Conduction |
 81%
From NCERT
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The temperature of the hot and cold ends of a 20 cm long rod in a thermal steady state is at \(100^{\circ}\mathrm{C}\) and \(20^{\circ}\mathrm{C}\) respectively. The temperature at the centre of the rod will be:
1. \(50^{\circ}\mathrm{C}\)
2. \(60^{\circ}\mathrm{C}\)
3. \(40^{\circ}\mathrm{C}\)
4. \(30^{\circ}\mathrm{C}\)

Subtopic:  Conduction |
 81%
From NCERT
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Two bars of thermal conductivities K and 3K and lengths 1 cm and 2 cm respectively have equal cross-sectional area, they are joined lengths wise as shown in the figure. If the temperature at the ends of this composite bar is 0°C and 100°C respectively (see figure), then the temperature ϕ of the interface is

(1) 50°C     
               
(2) 1003°C 

(3) 60°C   
                 
(4) 2003°C 

Subtopic:  Conduction |
 75%
From NCERT
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A heat flux of 4000 J/s is to be passed through a copper rod of length 10 cm and area of cross-section 100 cm2. The thermal conductivity of copper is 400 W/m°C. The two ends of this rod must be kept at a temperature difference of 
(1) 1°C                

(2) 10°C

(3) 100°C             

(4) 1000°C 

Subtopic:  Conduction |
 75%
From NCERT
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On a cold morning, a metal surface will feel colder to touch than a wooden surface because 

(1) Metal has high specific heat

(2) Metal has high thermal conductivity

(3) Metal has low specific heat

(4) Metal has low thermal conductivity

Subtopic:  Conduction |
 71%
From NCERT
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At a common temperature, a block of wood and a block of metal feel equally cold or hot. The temperatures of block of wood and block of metal are 

(1) Equal to temperature of the body

(2) Less than the temperature of the body

(3) Greater than temperature of the body

(4) Either (b) or (c)

Subtopic:  Conduction |
 51%
From NCERT
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The coefficient of thermal conductivity of copper is nine times that of steel. In the composite cylindrical bar shown in the figure. What will be the temperature at the junction of copper and steel 


(a) 75°C
(b) 67°C
(c) 33°C
(d) 25°C

Subtopic:  Conduction |
 77%
From NCERT
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A slab consists of two parallel layers of two different materials of same thickness having thermal conductivities K1 and K2. The equivalent conductivity of the combination is

(1) K1+K2           

(2) K1+K22

(3) 2K1K2K1+K2         

(4) K1+K22K1K2

Subtopic:  Conduction |
 68%
From NCERT
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There are two identical vessels filled with equal amounts of ice. The vessels are of different metals., If the ice melts in the two vessels in 20 and 35 minutes respectively, the ratio of the coefficients of thermal conductivity of the two metals is

(1) 4 : 7                   

(2) 7 : 4

(3) 16 :49                 

(4) 49 : 16

Subtopic:  Conduction |
 84%
From NCERT
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Heat current is maximum in which of the following (rods are of identical dimension) ?

Subtopic:  Conduction |
 65%
From NCERT
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