## Conduction - 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 Conduction. 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. Mud houses are cooler in summer and warmer in winter because

•  Mud is superconductor of heat
•  Mud is good conductor of heat
•  Mud is bad conductor of heat
•  None of these

Q2. Heat current is maximum in which of the following (rods are of identical dimension)

•  Cooper
•  Cooper-Steel
•  Steel-Cooper
•  Steel

Q3. The lengths and radii of two rods made of same material are in the ratios 1 : 2 and 2 : 3 respectively. If the temperature difference between the ends for the two rods be the same then in the steady state. The amount of heat flowing per second through them will be in the ratio

•  1:3
•  4:3
•  8:9
•  3:2

Q4. Two vessels of different materials are similar in size in every respect. The same quantity of ice filled in them gets melted in 20 minutes and 30 minutes. The ratio of their thermal conductivities will be

•  1.5
•  1
•  2/3
•  4

Q5. If the coefficient of conductivity of aluminium is 0.5 cal/cm-sec-°C, then in order to conduct 10 cal/sec-cm2 in the steady state, the temperature gradient in aluminium must be

•  5°C/cm
•  10°C/cm
•  20°C/cm
•  10.5°C/cm

Q6. The area of the glass of a window of a room is 10m2. and thickness 2 mm. The outer and inner temperature are 40°C and 20°C respectively. Thermal conductivity of glass in MKS system is 0.2. The heat flowing in the room per second will be

•  3 x 104 Joules
•  2 x 104 Joules
•  30 Joules
•  45 Joules

Q7. When two ends of a rod wrapped with cotton are maintained at different temperatures and after some time every point of the rod attains a constant temperature, then

•  Conduction of heat at different points of the rod stops because the temperature is not increasing
•  Rod is bad conductor of heat
•  Heat is being radiated from each point of the rod
•  Each point of the rod is giving heat to its neighbour at the same rate at which it is receiving heat

Q8. In which case the thermal conductivity increases from left to right

•  Al, Cu, Ag
•  Ag, Cu, Al
•  Cu, Ag, Al
•  Al, Ag, Cu

Q9. To a rough approximation, conductivities of metals are about

•  1000 times as those of liquids and 10,000 times of gases
•  10 times as those of liquids and 100 times of gases
•  100 times as those of liquids and 1000 times of gases
•  10,000 times as those of liquids and 1000 times of gases

Q10. A copper bar 10 cm long has its ends pressed against copper tanks at 0°C and 100°C. The ends are separated by layers of dust 0.1 mm thick. If conductivity of dust is 0.001 times that of copper, the temperatures of end P and Q of bar are

•  33.3°C and 66.7°C
•  66.7°C and 33.3°C
•  75°C and 25°C
•  60°C and 40°C

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