physics
1. What is the purpose of using an electric switch? Name two electrical gadgets.2+1
2. Why should an electrician use rubber gloves while repairing an electric switch at your home? Explain.3
Chemistry
1.Distinguish between hard and soft materials. 3
2.What do you mean by the following terms and give one example of each.
(a) soluble substance
(b) insoluble substance. 2+1
Biology
1. What is the function of a stem? 1
2. Draw the following:
(a) a leaf
(b) a taproot. 2+2
3. If a plant has fibrous root, what type of venation do its leaves have? 3.
Answers
Answer: 1) The purpose of using an electric switch is to control the flow of electricity in an electrical circuit. An electric switch can be used to turn an electrical device or appliance on or off, or to control the flow of electricity to different parts of a circuit.
Two examples of electrical gadgets that use electric switches are a lamp and a television. The switch on a lamp is used to turn the lamp on or off, while the switch on a television is used to control the flow of electricity to different parts of the circuit, such as the power supply, display, and other components.
I hope this helps! Let me know if you have any additional questions or need further clarification.
2) An electrician should use rubber gloves while repairing an electric switch at your home for several reasons.
First, rubber gloves provide insulation against electricity, which is important for protecting the electrician from electrical shocks. If an electrician comes into contact with live electrical wires or components while working on an electric switch, the gloves will help prevent the electricity from flowing through their body and potentially causing injury.
Second, rubber gloves help to protect the electrician's hands from cuts and abrasions. Electrical work can be physically demanding and may involve handling sharp or rough materials, such as wires and connectors. Rubber gloves provide an additional layer of protection to help prevent injuries to the hands.
Finally, rubber gloves can also help to protect the electrician from other hazards, such as chemical spills or contamination. Some electrical components may contain hazardous substances, such as insulation materials or cleaning agents, and wearing rubber gloves can help to prevent these substances from coming into contact with the skin.
Overall, using rubber gloves is an important safety precaution for electricians when working on electrical systems, including electric switches.
3) Hard materials are materials that are resistant to deformation, while soft materials are materials that are easily deformed.
Some common characteristics of hard materials include:
High density
High stiffness or rigidity
High melting point
High strength
High hardness
Low ductility (the ability to be drawn or stretched into thin wire)
Examples of hard materials include metals, such as steel and aluminum, and ceramics, such as glass and brick.
Some common characteristics of soft materials include:
Low density
Low stiffness or rigidity
Low melting point
Low strength
Low hardness
High ductility
Examples of soft materials include plastics, rubber, and some types of cloth.
It is important to note that the terms "hard" and "soft" are relative, and a material's hardness or softness can depend on a variety of factors, including its chemical composition, microstructure, and temperature. Some materials may be hard at room temperature but become softer when heated, while others may be soft at room temperature but become harder when cooled.
4) (a) A soluble substance is a substance that can dissolve in a solvent to form a homogenous solution.
For example, sugar is a soluble substance that can dissolve in water to form a solution that is uniformly mixed and appears clear.
(b) An insoluble substance is a substance that does not dissolve in a solvent and remains as a separate substance in the mixture.
For example, sand is an insoluble substance that does not dissolve in water. When sand is mixed with water, it remains as separate particles suspended in the liquid and does not form a homogenous solution.
I hope this helps! Let me know if you have any additional questions or need further clarification.
5) The stem is an important part of a plant that performs several key functions. Some of the main functions of a stem include:
Support: The stem provides structural support for the plant, helping it to stand upright and maintain its shape.
Transport: The stem transports water, nutrients, and sugars from the roots to the rest of the plant. It also transports oxygen from the leaves to the rest of the plant.
Photosynthesis: In some plants, the stem is capable of performing photosynthesis, which is the process of converting sunlight into energy through the production of glucose.
Reproduction: In some plants, the stem is involved in reproduction, producing flowers or seeds that can be used to propagate the plant.
Storage: The stem can also store food and nutrients, helping the plant to survive during periods of stress or when resources are scarce.
Overall, the stem is a vital part of a plant that performs a variety of important functions to support the plant's growth and survival.