Physics questions
20027 published questions with worked solutions.
- A body cools from 100^ to 70^ in 8 s. If the room temperature is 15^ and assuming Newton's law of cooling holds good, then time...
- Newton's law of cooling holds good only if the temperature difference between the body and the surroundings is [MHT-CET 2023]
- A hot body at a temperature 'T' is kept in a surrounding of temperature 'T_0'. It takes time 't_1' to cool from 'T' to 'T_2',...
- A metal rod is heated to t°C. A metal rod has length, area of cross-section, Young's modulus and coefficient of linear expansion...
- A metal rod of Young's module 'Y' and coefficient of linear expansion 'α' has its temperature raised by 'Δθ'. The linear stress...
- A metal rod of cross-section area 3 10^ -6 m^2 is suspended vertically from one end has a length 0.4 m at 100^ . Now the rod is...
- A metal rod of length L and cross-sectional area A is heated through T°C. What is the force required to prevent the expansion of...
- A wall has two layers A and B, each made of different material. Both the layers have same thickness. The thermal conductivity of...
- A window glass of area 10^3 cm^2 and thickness 4 mm having temperature on one side is 32^ and on the other side is -8^ ....
- The thermal conductivities of copper, mercury and glass are respectively K_C, K_M and K_G such that K_C>K_M>K_G. If same quantity...
- The rate of flow of heat through a copper rod with temperature difference 28^ is 1400 cal ,s^ -1 . The thermal resistance of...
- Two rods of different metals have coefficients of linear expansion ' _1' and ' _2' respectively. Their respective lengths are...
- On an imaginary linear scale of temperature (called 'W' scale) the freezing and boiling points of water are 39^ and 239^...
- A black rectangular surface of area 'A' emits energy 'E' per second at 27^ . If length and breadth is reduced to (1/3)rd of its...
- A conducting rod of length 1 m has area of cross-section 10^ -3 m^2 . One end is immersed in boiling water (100^ ) and the other...
- A copper rod and a steel rod having the same area of cross-section are end to end. The free end of copper rod is at 100^ and free...
- A body cools from 80^ to 64^ in 5 minute and same body cools from 80^ to 52^ in 10 minute. The temperature of surroundings is...
- The temperature difference between two sides of metal plate 3 cm thick is 15^ . Heat is transmitted through plate at the rate of...
- Find the value of -197^ temperature in Kelvin. [MHT-CET 2021]
- Two rods of same length and material are joined end to end. They transfer heat in 8 second. When they are joined in parallel they...