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PHYSICS [5 Mark Question Answer]

Current Electricity · ICSE STD 9 (ICSE - English Medium). 3 questions.

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[5 Mark Question Answer]

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Question 15 Marks
Distinguish between D.C. and A.C.
Answer
D. C.A. C.
Definition In DC, the current's direction doesn't change.In AC, the direction of the current keeps reversing periodically.
Load TypeDC’s load is generally resistive in nature.AC’s load is resistive, inductive or capacitive.
The direction of flowing electronsIn DC, the flowing electrons are unidirectionalThe direction of flow of electrons in AC is bidirectional.
FrequencyDC's frequency is Zero.AC's frequency is 50 or 60 Hz.
TransmissionWe can transmit it over a long distance with negligible losses.We can transmit it over a long distance with few losses.
PurposeUsed in electroplating, electrolysis, electronic equipment, and more.Used in factories, industries, households.
Passive ParameterResistanceImpedance
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Question 25 Marks
Distinguish between a closed circuit and an open circuit, with the use of suitable labelled diagrams.
Answer
A circuit is said to be closed when every part of it is made of a conductor and on plugging in the key or on being complete, current flows through the circuit.

A circuit is said to be open when no current flows through it. It can happen when the key is not plugged in or when any one of its components is not made of a conductor or when the circuit is broken.
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Question 35 Marks
In the electric circuit shown in Figure, label the parts A, B, C, D, E, and F. State the function of each part. Show in the diagram the direction of flow of current.
Answer
A: Ammeter - It measures the current flowing through the circuit.

B: Cell - It acts as a source of direct current for the circuit.

C: Key - It is used to put the current on and off in the circuit.

D: Load - It is an appliance connected in a circuit. It may just be a resistance (e.g., bulb) or a combination of different electrical components.

E: Voltmeter - It is used to measure the potential difference between two points of a circuit.

F: Rheostat - It is used to control the current in the circuit.
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[5 Mark Question Answer] - PHYSICS STD 9 Questions - Vidyadip