Class 9 Current Electricity Mock Test (ICSE)

Topics in Current Electricity

• Electric charge and current
• Potential and potential difference
• Simple electric circuits
• Conductors and insulators
• Direction of conventional current
• Efficient use of electricity

Current Electricity practice questions with answers

1. Q1Multiple choice·1 mark
   What is the direction of conventional current in an external circuit connected to a cell?

   1. (a)Independent of the terminals
   2. (b)From the positive terminal to the negative terminal
   3. (c)From north to south
   4. (d)From the negative terminal to the positive terminal
   Show answer and step marks

   1. Correct option: (b). Conventional current is defined as the direction of flow of positive charge, which is from the positive terminal to the negative terminal in the external circuit.+1

   Answer: (b)
2. Q2Multiple choice·1 mark
   Which of the following practices promotes the efficient use of electricity in households?

   1. (a)Setting the air conditioner to its lowest temperature to cool faster
   2. (b)Running the washing machine with half loads more often
   3. (c)Using filament bulbs as they also give out some useful heat
   4. (d)Choosing appliances with a higher star rating on the label
   Show answer and step marks

   1. Correct option: (d) Choosing appliances with a higher star rating on the label. Higher-star appliances do the same work with less electrical energy; a very low AC setting, frequent half loads and filament bulbs all waste energy.+1

   Answer: (d)
3. Q3Multiple choice·1 mark
   A current of $2\text{ A}$ flows through a conductor for $10\text{ s}$. The total electric charge that passes through the cross-section of the conductor is:

   1. (a)$0.2\text{ C}$
   2. (b)$20\text{ C}$
   3. (c)$2\text{ C}$
   4. (d)$5\text{ C}$
   Show answer and step marks

   1. Correct option: (b). Using the relation $Q = I \times t$, $Q = 2\text{ A} \times 10\text{ s} = 20\text{ C}$.+1

   Answer: (b)
4. Q4Multiple choice·1 mark
   The work done in moving a charge of $2\text{ C}$ across two points in a circuit is $20\text{ J}$. The potential difference between these points is:

   1. (a)$5\text{ V}$
   2. (b)$10\text{ V}$
   3. (c)$0.1\text{ V}$
   4. (d)$40\text{ V}$
   Show answer and step marks

   1. Correct option: (b). Using the relation $V = \frac{W}{Q}$, $V = \frac{20\text{ J}}{2\text{ C}} = 10\text{ V}$.+1

   Answer: (b)

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