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Answer the following questions:
1. Which gas is used in an electric bulb?
%. A far-sighted object can be seen with the help of which
9. Why do we use a microscope ?
4. Which of these is not a metal-water vapour or mere
6. What is the normal temperature of the pure water
6. Which is the hardest substance ?
7. What is the melting point of ice ?
8. Which travels faster-sound or light?
9. Which gas fumes strongly in the air
10. How much blood does a normal person have
Answers
Answer:
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a wire filament heated until it glows. The filament is enclosed in a glass bulb with a vacuum or inert gas to protect the filament from oxidation. Current is supplied to the filament by terminals or wires embedded in the glass. A bulb socket provides mechanical support and electrical connections.
Answer:
1-General service incandescent light bulbs over about 25 watts in rating are now filled with a mixture of mostly argon and some nitrogen, or sometimes krypton. While inert gas reduces filament evaporation, it also conducts heat from the filament, thereby cooling the filament and reducing efficiency.
2-It receives visual information and sends it to your optic nerve, which carries that information to your brain. A perfectly formed, curved lens and cornea allow you to see a perfectly focused image.
3-Microscopes are used in viewing the specimens that are relatively very small in size, they are used to view the cellular structures of organs, germs, and bacteria, They play a very important role in the laboratory for the tissues and organisms which are too small to be seen clearly with the naked eye.
4-Water vapor, water vapour or aqueous vapor is the gaseous phase of water. It is one state of water within the hydrosphere. Water vapor can be produced from the evaporation or boiling of liquid water or from the sublimation of ice. Water vapor is transparent, like most constituents of the atmosphere.[4] Under typical atmospheric conditions, water vapor is continuously generated by evaporation and removed by condensation. It is less dense than most of the other constituents of air and triggers convection currents that can lead to clouds.
5-Pure water will remain neutral at 0°C (pH is 7.47), 25°C. (pH is 7.00) or 100°C.
6-According to the Mohs Hardness Scale, tooth enamel earns a 5. That means it's about as hard, or harder, than steel. For reference, diamonds are the strongest substance on earth, ranking 10 on the Mohs scale.
7-32°F
The melting point at which ice — a solid — turns to water — a liquid — is 32°F (0°C).
8-The speed of light as it travels through air and space is much faster than that of sound; it travels at 300 million meters per second or 273,400 miles per hour. ... Speed of light in water = 226 million m/s or 205,600 mph.
9-NaHSO4 + HCl gb Nacl + NaHSO4 ⟶ Na2SO4 + HCl giv It is because the HCl gas is extremely so luble in water. Thus the gas dissolves in water vapour present inthe air to form tiny droplets of hydrochloric acid which appear in the form of fumes.
10-adult will have approximately 1.2-1.5 gallons (or 10 units) of blood in their body. Blood is approximately 10% of an adult's weight.
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