## Combination of Conductors - MCQ - Basic Level

Physics is an important subject in preparation for various Competitive exams. To keep a track of your preparation we have designed a small quiz of Basic Level Questions on Combination of Conductors. You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1.  A wall has two layers A and B each made of different materials. The thickness of both the layers is the same. The thermal conductivity of A, KA = 3KB. The temperature difference across the wall is 20°C in thermal equilibrium

•  The temperature difference across A is 15°C
•  Rate of heat transfer across A is more than across B
•  Rate of heat transfer across both is same
•  Temperature difference across A is 5°C

Q2. Two cylinders P and Q have the same length and diameter and are made of different materials having thermal conductivities in the ratio 2 : 3. These two cylinders are combined to make a cylinder. One end of P is kept at 100°C and another end of Q at 0°C. The temperature at the interface of P and Q is

•  30°C
•  40°C
•  50°C
•  60°C

Q3. Two identical plates of different metals are joined to form a single plate whose thickness is double the thickness of each plate. If the coefficients of conductivity of each plate are 2 and 3 respectively, then the conductivity of composite plate will be

•  5
•  2.4
•  1.5
•  1.2

Q4. Four identical rods of same material are joined end to end to form a square. If the temperature difference between the ends of a diagonal is 100°C, then the temperature difference between the ends of other diagonal will be

•  0°C
•  100/l°C : where l is the length of each rod
•  100/2l°C
•  100°C

Q5. Three rods A, B and C have the same dimensions. Their thermal conductivities are KA, KB and KC respectively. A and B are placed end to end, with their free ends kept at a certain temperature difference. C is placed separately, with its ends kept at the same temperature difference. The two arrangements conduct heat at the same rate. KC must be equal to

•  KA + KB
•  KAKB/(KA + KB)
•  1/2 (KA + KB)
•  2KAKB/(KA + KB)

Q6. The three rods described in the previous question are placed individually, with their ends kept at the same temperature difference. The rate of heat flow through C is equal to the rate of combined heat flow through A and B. KC must be equal to

•  KA + KB
•  KAKB/(KA + KB)
•  1/2 (KA + KB)
•  2KAKB/(KA + KB)

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