Are Double Pane Windows Soundproof? Answer: If you use two panes of glass instead of one in the glass windows of the house, the sound outside the house is not heard by the person inside the house. Because, if there are two panes in the window, the air is trapped between the two panes. As […]
Q. Mention two applications of the thermal effect of electric current which are used in domestic life. Answer: Electric irons and heaters made by exploiting the thermal effect of electric current are used in domestic life.
What is the reason for the rumbling sound of clouds? Answer: Cloud rumble is the resonance of sound. The sound of cloud rumbling is reflected by different layers of clouds creating multiple echoes. These multiple echoes are responsible for the rumbling sound of clouds.
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Reasons why roofs of the modern theatre are curved like arches Answer: Modern theatre roofs are curved like arches; As a result, the roof acts as a concave reflector. When a speaker delivers a speech at the focus of the reflector, the sound is reflected on the ceiling and reaches the audience in the theatre
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Why do we put the palm next to the ear to hear distant sounds? Answer: We hold our palms close to our ears to listen for faint sounds from far away. In this case, the palm acts as a concave reflector and reflects the sound to the ear.
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Why is the soft pad attached to the wall of the cinema hall? Reasons why cinema hall walls are soft padded: Cinema hall walls are fitted with soft pads. They act as sound absorbers. Such arrangements are made to stop unwanted reflections of sound inside the hall.
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Why is loud noise produced in the hall? Answer: Loud noises in the hall are reflected repeatedly from the walls, floor and ceiling of the room, resulting in reverberation.
What is Short Circuit? Answer: When two lines of opposite current or two opposite poles of a cell are connected through a very small resistance, the current in the circuit increases greatly. It is called a short circuit. If there is a short circuit, a lot of heat can be generated and the line can
Why is the electric bulb filled with inert gases? Answer: The filament of an airless bulb evaporates quickly. As a result, the filament breaks down quickly. Also, the filament material vaporizes and forms a coating around the bulb. Because of this, the brightness of the light decreases. But filling the bulb with inert gas reduces
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Why is the bulb of the electric lamp not filled with air? Answer: If the electric lamp bulb is kept air-filled and the current is sent, the filament reacts with the oxygen in the air to form a metal oxide and gradually loses its efficiency. As a result, the filament breaks down and no longer
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