1. The amount of heat required to raise the temperature of 1 Kg of a substance by one Kelvin is
Specific heat capacity refers to the amount of heat energy required to raise the temperature of 1 kilogram of a substance by 1 Kelvin (or 1°C). It is a material-specific property.
2. The boiling of water inside the pressure cooker is
The boiling point of water inside a pressure cooker is (C) 120°C.
This occurs because the increased pressure inside the cooker raises the boiling point of water, allowing it to boil at a higher temperature than 100°C.
3. The amount of heat required to raise the temperature of a substance by one Kelvin is
Thermal capacity refers to the heat needed to raise the temperature of an entire substance. Specific heat capacity is for unit mass. Latent heat is involved in phase changes, not temperature changes.
4. The unit of thermal capacity is
Thermal capacity is the amount of heat required to raise the temperature of a substance by one Kelvin, and its unit is joules per Kelvin.
5. The unit of latent heat is
Latent heat is the amount of heat required to change the phase of 1 kilogram of a substance without changing its temperature. Therefore, its unit is Joule per kilogram.
6. Different metals in the bimetallic strips are
Bimetallic strips typically consist of two different metals, such as brass and iron, that expand at different rates when heated. This difference in expansion causes the strip to bend, and it is commonly used in thermostats.
7. The ration of salt and ice in the freezing mixture is
In a freezing mixture, the common ratio of salt to ice is 1 part salt to 3 parts ice. This mixture lowers the freezing point of the ice, allowing it to absorb heat and freeze the substance effectively.
8. When sugar is dissolved in water
When sugar dissolves in water, it forms a homogeneous solution without undergoing any major physical transformations like boiling or evaporation. The sugar molecules disperse throughout the water molecules, creating a uniform mixture. The process is physical, not chemical, and the water remains in its liquid state, although it may cool slightly depending on the conditions of the environment.
9. The amount of water vapour present in atmospheric is known as
Humidity refers to the amount of water vapor present in the air. It is typically measured in terms of absolute humidity, relative humidity, or specific humidity.
10. The lowest temperature that can be obtained using a freezing mixture is
A freezing mixture, typically made of ice and salt, can lower the temperature to about -23°C. This happens because the salt disrupts the ice's freezing point, causing the temperature to drop below the normal freezing point of water (0°C).
11. The unit of Humidity is
Humidity refers to the amount of water vapor present in the air, and its unit is typically expressed as kilograms of water vapor per cubic meter of air (Kg/m³).
12. The value of J is
This is the conversion factor between joules and calories, where 1 calorie is equivalent to 4.186 joules.
13. The formula to calculate the thermal capacity of a substance is
Thermal capacity (or heat capacity) is calculated using the formula:
Thermal Capacity = mass × specific heat capacity
14. The process by which a liquid changes into solid is
Freezing is the process in which a liquid changes into a solid when its temperature is lowered.
15. The reverse process of vapour becoming liquid is
Condensation is the process in which a vapor or gas changes into a liquid as it cools down.
16. The coolant used in radiators of automobile engines are
Water is commonly used as a coolant in automobile engine radiators due to its high heat capacity and efficiency in absorbing and dissipating heat.
17. The melting point of silver is
The melting point of silver is 961°C.
18. The transformation of a liquid to the gaseous state is called
Vapourisation is the process by which a liquid changes into a gas. This includes both boiling and evaporation.
19. The specific heat capacity is maximum in
Water has the highest specific heat capacity among the options listed, meaning it requires more energy to raise its temperature compared to other substances.
20. Different metals in the bimetallic strips are
Brass and iron can also be used in bimetallic strips, but nickel and aluminium are more commonly used due to their distinct rates of expansion and more consistent applications in devices like thermostats.
Brass and iron could potentially be used in specific situations where their particular thermal expansion characteristics are needed, but in general, nickel and aluminium are the standard metals in most bimetallic strip applications.
21. Calorimeter is a device for measuring
A calorimeter is used to measure the heat capacity of a substance, which is directly related to its specific heat capacity. It helps determine how much heat is required to change the temperature of a material.
22. Heat is measured in
Heat is measured in Joules (J), which is the SI unit of energy.
23. The unit of latent heat is
Latent heat is the amount of heat required to change the phase of a unit mass of a substance without changing its temperature. Hence, the unit is Joule per kilogram (J/kg).
24. The latent heat of vapourisation of water is
This is the approximate value of the latent heat of vaporization of water.
25. The volatile liquid used in refrigerator is
Freon is a commonly used refrigerant in refrigerators and air conditioners due to its volatility and efficiency in heat transfer.
26. The change from the solid to gaseous state directly without becoming liquid is called
Sublimation is the process where a substance changes directly from a solid to a gas without passing through the liquid phase, such as with dry ice (solid carbon dioxide).
27. The specific heat capacity is minimum in
Mercury has a relatively low specific heat capacity compared to other substances like water. This means it requires less heat to raise the temperature of mercury by a given amount.
28. Water pipes in winter burst in cold countries due to
Water expands when it freezes, and this expansion increases pressure inside the pipes. In colder countries, when the water temperature approaches freezing, it can freeze inside the pipes, causing them to expand and ultimately burst due to the pressure buildup. It's a common issue in areas where temperatures regularly fall below freezing.
29. The boiling of water inside the pressure cooker is
The boiling point of water inside a pressure cooker is higher than 100°C because the pressure inside the cooker is increased.
30. The process of changing a substance from solid to liquid state is
The process of changing a substance from a solid to a liquid state is called melting.
31. The main source of Heat Energy is
The main source of heat energy for the Earth is the Sun.
32. The pressure of the steam inside the pressure cooker is
The pressure of the steam inside a pressure cooker typically ranges between 1.5 to 2.5 atmospheres, but it can be slightly higher depending on the model and design.