Question

Q6. Give reasons of the following statements. i. Liquids are quite dense as compared to gases. ii. The filament in the bulb takes quite a while to burn out. Seeds formed in the autumn do not grow until the following spring. Electromagnets are more efficient than permanent magnet. The stigma in the female part of the flower is usually sticky. iv. V. Q7.a) Describe the effect of electric current on chemical reactions? b) What change would happen if we put a 10A fuse in a 4A sandwich maker? Explain your answer.​

Answer 1

Answer:

1. the molecules of a liquid are packed relatively close together. On the other hand liquids are much denser than gases. The density of a liquid is typically about the same as a density of the solid state of the substance.
2. The reason an incandescent bulb burns out is due to eventual thinking of a tungsten filament that bones white heat, to give off light. Compounding the issue is excessive search current that passes through the filament every time the bulb is turned on.
3. Plants and seeds need water to grow so hence, they would not be able to grow without water. Also the sunlight is slightly low in autumn which is also necessary for the plants.
4. The main advantage of an Electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that means no power, and Electromagnet required a continuous supply of current to maintain the magnetic field.
5. the female portion of a flower is generally located at the centre. It is called the pistil and is made up of three parts, the top part of the pistil is called the stigma and is sticky so it will track and hold Pollen. In flowering plant the flowers function is sexual reproduction.

• A- The passage of an electric current through a conducting pollution causes chemical reactions. As a result bubbles of a gas may be formed on the electrodes. Deposits of metal may be seen on electrodes. Changes of colour of solutions may occur.
• B- Nothing immetiate it should work fine but the rating on the original fuse wire is likely to do so that if the sandwich maker overloaded the fuse would burn out for the sandwich maker (wiring overheated)

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