Advertisements
Advertisements
प्रश्न
Fill in the blank
Heat is a form of _______.
विकल्प
electrical energy
gravitational energy
thermal energy
None of these
Advertisements
उत्तर १
Heat is a form of energy.
उत्तर २
Heat is a form of thermal energy.
संबंधित प्रश्न
Match the following
| Column A | Column B |
| 1. mercury | 1. insulator |
| 2. wood | 2. water from 0°C to 4°C |
| 3. Aluminum | 3.absorbs |
| 4. contracts | 4.conductor |
| 5.black surface | 5. Thermometer |
Name the three modes of transfer of heat.
Draw a labelled diagram of a thermo flask. Explain how the transfer of heat by conduction, convection and radiation is reduced to a minimum in it.
Cooking utensils are made from metals due to their property of ______.
What will absorb heat?
Steel spoon
What will absorb heat?
Water
What will absorb heat?
Wax
What will absorb heat?
Glass vessel
Name the SI unit of heat.
Complete the following sentence:
CGS units of heat is _________
1 calorie is 4.81 joules.
The unit of heat is
To keep her soup warm Paheli wrapped the container in which it was kept with a woollen cloth. Can she apply the same method to keep a glass of cold drink cool? Give reason for your answer.
A circular metal loop is heated at point O as shown in the following figure.
- In which direction would heat flow in the loop?
- In which order are the pins at points P, Q and R fixed with the help of wax fall if points O, P, Q and R are equidistant from each other?
Observe the picture given in figure. Water is being boiled in a pan of wide base.
- Which position P or T will feel warmer?
- Fill up the boxes P and T to indicate the mode of flow of heat to the hand.
You would have noticed some space being left on railway tracks. Why?
Arrange the following in order of decreasing the expansion of heating: Steel, milk, air.
Which of the following is true?
Explain the following effects of heat.
Chemical changes
