Physics questions
20027 published questions with worked solutions.
- A cylindrical rod is having temperature _1 and _2 at its ends. The rate of heat flow is 'Q' Js^ -1 . All the linear dimensions of...
- The rate of flow of heat through a copper rod with temperature difference 28^ is 1400 cal ,s^ -1 . The thermal resistance of...
- A cylindrical rod has temperature 'T_1' and 'T_2' at its ends. The rate of flow of heat is 'Q_1' cal ,s^ -1 . If length and...
- A metal sphere cools at the rate of 1.5 ^ /min when its temperature is 80^ . At what rate will it cool when its temperature falls...
- The temperature difference between two sides of an iron plate, 1.8 cm thick 9^ . Heat is transmitted through the plate 10 k...
- The volume of a metal sphere increases by 0.30% when its temperature is raised by 50^ . The coefficients of linear expansion of...
- The coefficient of linear expansion of brass and steel rod are ' _1' and ' _2' respectively. Lengths of brass and steel rods are...
- The ratio of thermal conductivity of two rods A and B having same area of cross-section is 3:2. If the thermal resistance of two...
- Rate of flow of heat through a cylindrical rod is H_1. The temperature of the ends of the rod are T_1 and T_2. If all the...
- A cylindrical metallic rod in thermal contact with two reservoirs of heat at its two ends conduct an amount of heat 'Q_1' in time...
- The coefficient of thermal conductivity of a rod depends on its [MHT-CET 2018]
- Two metal rods P and Q have same length and same temperature difference between their ends. Their thermal conductivities are K_1...
- Two metal slabs of same cross-section area have thickness 'd_1' and 'd_2' and thermal conductivities 'K_1' and 'K_2'...
- Rate of flow of heat through a cylindrical rod is 'H_1'. The temperature of the ends of the rod are 'T_1' and 'T_2'. If all the...
- A body cools from 90^ to 70^ in 6 minute. If the temperature of the surroundings is 30^ , the time taken by the body to cool from...
- A cylindrical metallic rod in thermal contact with two reservoirs of heat at its two ends conduct heat 'Q_1' in time 't'. The...
- Two rods of same material, same length and same radius transfer a given amount of heat in 't' second when they are joined end to...
- A thermometer bulb has volume 10^ -6 m^3 and cross-section of the stem is 0.002 cm^2 . The bulb is filled with mercury at 0^ . If...
- Which of the following is NOT a mode of heat transfer? [MHT-CET 2008]
- A liquid having coefficient of cubical expansion ' ' is kept in a copper vessel having coefficient of linear expansion 3 . If...