Question : Which of the following is used in solar cookers?
Option 1: Electrical supply
Option 2: Solar plate
Option 3: Mirror
Option 4: Electrochemical cell
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Correct Answer: Mirror
Solution : The correct answer is Mirror.
In solar cookers, we use a concave type of mirror. Concave mirrors are used because they reflect the sunlight rays falling on them at a single focal point. At the focal point, when the cooking pot is placed, it produces enough heat and energy to cook that food.
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Question : An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a:
Option 1: Power transmitter
Option 2: Battery
Option 3: Uninterrupted Power Supply (UPS)
Option 4: Generator
Question : Directions: In the following question, arrange the following words as per their order in the dictionary. 1. Plate 2. Plane 3. Plaster 4. Plasma 5. Plastic
Option 1: 2, 1, 5, 3, 4
Option 2: 1, 2, 3, 4, 5
Option 3: 2, 5, 3, 4, 1
Option 4: 2, 4, 3, 5, 1
Question : In a showroom, the ratio of TVs and rice cookers is 2 : 3. Find the percentage of rice cookers in the showroom.
Option 1: 40%
Option 2: 30%
Option 3: 60%
Option 4: 50%
Question : Conversion of sound energy into electrical energy is done by:
Option 1: Solar cell
Option 2: Gramophone
Option 3: Microphone
Option 4: Loudspeaker
Question : Directions: In the following question, arrange the following words as per their order in the dictionary. 1. Smoulder 2. Smother 3. Smuggle 4. Smudge
Option 1: 1, 2, 3, 4
Option 2: 1, 4, 3, 2
Option 3: 4, 3, 2, 1
Option 4: 2, 1, 4, 3
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