CBSE Class 7 Science Heat Worksheets with Answers - Chapter 4 - PDF
FAQs on CBSE Class 7 Science Heat Worksheets
The differences are as follows:
Clinical Thermometer | Laboratory Thermometer |
Used in homes, hospitals to measure the human body’s temperature | They are usually used in laboratories |
Their temperature range is 94°F to 108°F. | Their temperature range is -10˚C to 110˚C |
It has kink | No kink is present |
Jerk is given to lower the mercury level | No jerk is given to lower the mercury level |
Temperature can be read after removing it | Temperature is read while being in contact with it |
They are small in size | They are large in size |
2. Describe in detail Sea Breeze and Land Breeze.
Sea Breeze- The process occurs continuously throughout the day. Both land and sea surfaces are heated by the sun, with the sea absorbing heat slower than land. Therefore, the temperature over the land surface increases, in turn heating up the sea surface. As a result of the expansion of the less dense warm air, an area of low pressure develops over the land. However, on the sea surface, a zone of high pressure is developing. This occurs because air moves from the high pressure over the sea to the low pressure over the land.
Land Breeze- During the night period, the above-mentioned process reverses itself. Both the land and the sea begin cooling when the sun sets. However, the land cools down more quickly than the sea. This leads to a low-pressure situation over the sea as the temperatures are higher above it than the land. Because of this, the air moves from the land to the sea and is referred to as the land breeze.
3. Difference between Conductors and Insulators.
The differences are as follows:
Conductors | Insulators |
Conductors are the materials or substances which allow the current to flow through it | Insulators are the substances that do not allow current to flow through it |
Electric charges exist on the surface of conductors | Electric charges are don’t in the insulators |
The thermal conductivity of a conductor is very high | The thermal conductivity of a conductor is very low |
The resistance of conductors are low | The resistance of insulators are very high |
Examples- silver, aluminium, iron, and copper | Example- Wood, Mica, Glass, Rubber, Cotton and plastic |
4. Why is it that mercury is used in thermometers and not water?
Since water's freezing and boiling points are different from that of other liquids, it cannot be used in thermometers. If water is used in a thermometer, it will phase change between 0 °C- 100 °C and will not measure temperature beyond that range.
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Generally, an electrical conductor is defined as materials that allow electricity to flow freely through them. The ability of conductors to conduct electricity is known as conductivity. The flow of electrons within a conductor is known as the electric current. Voltage is required to make the current flow through a conductor. When a charge is transferred to such an object, the charge gets dispersed across the entire surface, which causes electrons to move around. Conductors include metals, humans, and the earth itself. Because of this, we are all known to get electric shocks!