Ice at temperature –10°C is converted to steam at 100°C, the curve plotted between temperature (T) and time (t) when it is being heated by constant power source is
The Correct Option is B
Solution and Explanation
Solution: The heating process involves several stages:
Heating Ice from -10°C to 0°C: The temperature increases until it reaches 0°C.
Melting Ice at 0°C: The temperature remains constant while the ice melts into water, represented as a plateau on the graph.
Heating Water from 0°C to 100°C: The temperature of the water increases until it reaches 100°C.
Boiling Water at 100°C: The temperature remains constant as the water turns into steam, represented as another plateau on the graph.
Heating Steam from 100°C Onward: The temperature of the steam increases.
The correct graph will show:
- An initial increase in temperature from -10°C to 0°C.
- A plateau at 0°C during the melting phase.
- An increase in temperature from 0°C to 100°C.
- A plateau at 100°C during the boiling phase.
- A continued increase in temperature as steam is heated.
Top Questions on Heat Transfer
Three conductors of same length having thermal conductivity \(k_1\), \(k_2\), and \(k_3\) are connected as shown in figure. Area of cross sections of 1st and 2nd conductor are same and for 3rd conductor it is double of the 1st conductor. The temperatures are given in the figure. In steady state condition, the value of θ is ________ °C. (Given: \(k_1\) = 60 Js⁻¹m⁻¹K⁻¹,\(k_2\) = 120 Js⁻¹m⁻¹K⁻¹, \(k_3\) = 135 Js⁻¹m⁻¹K⁻¹)
- JEE Main - 2025
- Physics
- Heat Transfer
- Two spherical bodies of same materials having radii 0.2 m and 0.8 m are placed in same atmosphere. The temperature of the smaller body is 800 K and temperature of bigger body is 400 K. If the energy radiate from the smaller body is E, the energy radiated from the bigger body is (assume, effect of the surrounding to be negligible):
- JEE Main - 2025
- Physics
- Heat Transfer
- Two cylindrical rods A and B made of different materials, are joined in a straight line. The ratio of lengths, radii and thermal conductivities of these rods are : $ \frac{L_A}{L_B} = \frac{1}{2} $, $ \frac{r_A}{r_B} = 2 $, and $ \frac{K_A}{K_B} = \frac{1}{2} $. The free ends of rods A and B are maintained at $ 400 \, K $, $ 200 \, K $, respectively. The temperature of rods interface is ____ K, when equilibrium is established.
- JEE Main - 2025
- Physics
- Heat Transfer
- A wire of length 10 cm and diameter 0.5 mm is used in a bulb. The temperature of the wire is 1727°C and power radiated by the wire is 94.2 W. Its emissivity is $ \frac{x}{8} $, where $ x = \ldots $
- JEE Main - 2025
- Physics
- Heat Transfer
- A horizontal pipe carries water in a streamlined flow. At a point along the pipe, where the cross-sectional area is \( 10 \, \text{cm}^2 \), the velocity of water is 1 m/s and the pressure is 2000 Pa. What is the pressure of water at another point where the cross-sectional area is \( 5 \, \text{cm}^2 \)? [Density of water = 1000 kg/m³]
- KCET - 2025
- Physics
- Heat Transfer
Questions Asked in JEE Main exam
If 1 mM solution of ethylamine produces pH = 9, then the ionization constant (\(K_b\)) of ethylamine is \(10^{-x}\).
The value of x is (nearest integer).
The degree of ionization of ethylamine can be neglected with respect to unity.- JEE Main - 2025
- Organic Chemistry
During "S" estimation, 160 mg of an organic compound gives 466 mg of barium sulphate. The percentage of Sulphur in the given compound is %.
(Given molar mass in g mol\(^{-1}\) of Ba: 137, S: 32, O: 16)- JEE Main - 2025
- Stoichiometry and Stoichiometric Calculations
Which among the following react with Hinsberg's reagent?
Choose the correct answer from the options given below:- JEE Main - 2025
- Organic Chemistry
If \(\int e^x \left( \frac{x \sin^{-1} x}{\sqrt{1-x^2}} + \frac{\sin^{-1} x}{(1-x^2)^{3/2}} + \frac{x}{1-x^2} \right) dx = g(x) + C\), where C is the constant of integration, then \(g\left( \frac{1}{2} \right)\)equals:
- JEE Main - 2025
- Integration and Trigonometry
Match the LIST-I with LIST-II:
Choose the correct answer from the options given below :- JEE Main - 2025
- Chemical bonding and molecular structure
Concepts Used:
Heat Transfer
What is Heat Transfer?
It is defined as the movement of heat across the border of the system due to a difference in temperature between system and its surroundings.
How is Heat Transferred?
Heat can travel from one place to another in several ways. The different modes of heat transfer include:
- Conduction - Heat flows from things with higher temp to objects with lower temp.
- Convection - Movement of liquid molecules from higher temp regions to lower temp regions.
- Radiation - Radiant heat is present in every other way in our daily lives. Thermal radiations are also known to as radiant heat. Thermal radiation is generated by the emission of electromagnetic waves.
