Recent questions in 9th

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Give example Metals with variable valency

asked Apr 11, 2022 in Chapter 4 Measurement of Matter by Doubtly (98.9k points)

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Give example Composite radicals

asked Apr 11, 2022 in Chapter 4 Measurement of Matter by Doubtly (98.9k points)

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Give examples Basic radicals

asked Apr 11, 2022 in Chapter 4 Measurement of Matter by Doubtly (98.9k points)

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Give examples. Positive ions

asked Apr 11, 2022 in Chapter 4 Measurement of Matter by Doubtly (98.9k points)

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Why are fuse wires used?

asked Apr 11, 2022 in Chapter 3 Current Electricity by Doubtly (98.9k points)

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Explain Ohm’s law with the formula.

asked Apr 11, 2022 in Chapter 3 Current Electricity by Doubtly (98.9k points)

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What are free electrons?

asked Apr 11, 2022 in Chapter 3 Current Electricity by Doubtly (98.9k points)

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If a charge of 420 C flows through a conducting wire in 5 minutes what is the value of the current?

asked Apr 11, 2022 in Chapter 3 Current Electricity by Doubtly (98.9k points)

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When two resistors are connected in series, their effective resistance is 80 Ω. When they are connected in parallel,

asked Apr 11, 2022 in Chapter 3 Current Electricity by Doubtly (98.9k points)

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The resistance of a 1 m long nichrome wire is 6 Ω. If we reduce the length of the wire to 70 cm.

asked Apr 11, 2022 in Chapter 3 Current Electricity by Doubtly (98.9k points)

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Three resistances x1 , x2 and x3 are connected in a circuit in different ways. x is the effective resistance

asked Apr 11, 2022 in Chapter 3 Current Electricity by Doubtly (98.9k points)

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Resistances R1 , R2 , R3 and R4 are connected as shown in the figure. S1 and S2 are two keys.

asked Apr 11, 2022 in Chapter 3 Current Electricity by Doubtly (98.9k points)

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The resistance of a conductor of length x is r. If its area of cross-section is a, what is its resistivity?

asked Apr 11, 2022 in Chapter 3 Current Electricity by Doubtly (98.9k points)

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Match the pairs ‘A’ Group ‘B’ Group 1. Free electrons a. V/ R 2. Current b. Increases the resistance in the circuit

asked Apr 11, 2022 in Chapter 3 Current Electricity by Doubtly (98.9k points)

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The following table shows current in Amperes and potential difference in Volts. V (Volts) I (Amp)

asked Apr 11, 2022 in Chapter 3 Current Electricity by Doubtly (98.9k points)

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Umesh has two bulbs having resistances of 15 Ω and 30 Ω . He wants to connect them in a circuit, but if he connects

asked Apr 11, 2022 in Chapter 3 Current Electricity by Doubtly (98.9k points)

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The following figure shows the symbols for components used in the accompanying electrical circuit.

asked Apr 11, 2022 in Chapter 3 Current Electricity by Doubtly (98.9k points)

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The accompanying figure shows some electrical appliances connected in a circuit in a house.

asked Apr 11, 2022 in Chapter 3 Current Electricity by Doubtly (98.9k points)

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What is the law of conservation of energy?

asked Apr 8, 2022 in Chapter 2 Work and Energy by Doubtly (98.9k points)

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Into which form are the chemical energy stored in the exploding firecrackers converted to?

asked Apr 8, 2022 in Chapter 2 Work and Energy by Doubtly (98.9k points)

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