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Draw the diagram of a right-angled isosceles prism which is used to make an invented image erect.
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How does the wave pattern of a loud note differ from that of a soft note? Draw a diagram.
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Angle of deviation is the angle which the ______ ray makes with the direction of ______ray.
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What do you understand by the deviation produced by a prism? Why is it caused?
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How is loudness of sound related to the intensity of wave producing it?
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Comment on the statement 'loudness of sound is a subjective quantity, while intensity is an objective quantity.
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Name the unit used to measure the sound level.
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State the factor that determine the loudness of the sound heard.
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Name the characteristic of the sound affected due to a change in its amplitude.
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By reducing the amplitude of a sound wave, its ______.
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State how are the two resistors joined with a battery when equivalent resistance is less than either of the two resistances.
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State how are the two resistors joined with a battery when potential difference is same across each resistor.
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In parallel combination of resistances ______.
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Which of the following combinations have the same equivalent resistance between X and Y?
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Two resistors having resistance 4𝛀 and 6𝛀 are connected in parallel. Find their equivalent resistance.
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Four resistors each of resistance 2Ω are connected in parallel. What is the effective resistance?
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You have three resistors of values 2Ω, 3Ω and 5Ω. How will you join them so that the total resistance is less than 1Ω? Draw diagram and find the total resistance.
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Calculate the equivalent resistance between the points A and B in Fig. if each resistance is 2·0 Ω.

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A combination consists of three resistors in series. Four similar sets are connected in parallel. If the resistance of each resistor is 2 ohm, find the resistance of the combination.
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Five resistors, each 3 Ω, are connected as shown in Fig. Calculate the resistance
- between the points P and Q.
- between the points X and Y.
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