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DSSSB TGT Electricity — practice questions

Explore 26 free Electricity questions in DSSSB TGT Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Electricity questions and exercises with answers

Showing questions 1–26 of 26.

The SI unit of electric current is:Read the answer and worked solution →A charge of 60 C passes through a wire in 2 minutes. Find the current.Read the answer and worked solution →According to Ohm's law, V = ?Read the answer and worked solution →A bulb has a resistance of 30 Ω and operates at 6 V. Find the current.Read the answer and worked solution →In a circuit, where is the ammeter connected and where is the voltmeter connected?Read the answer and worked solution →Two resistors 4 Ω and 6 Ω are connected in series. Find R_total.Read the answer and worked solution →Two resistors 6 Ω and 3 Ω are connected in parallel. Find R_total.Read the answer and worked solution →Three resistors of 5 Ω each are connected in parallel. Find R_total.Read the answer and worked solution →How does the resistance of a wire change if its length is doubled while area stays the same?Read the answer and worked solution →A 12 V battery is connected across two resistors 4 Ω and 8 Ω in series. The current is:Read the answer and worked solution →Why is nichrome used for the heating element of an electric iron rather than copper?Read the answer and worked solution →Joule's law of heating states that H equals:Read the answer and worked solution →The SI unit of electric power is:Read the answer and worked solution →A 60 W bulb operates on 240 V. Find the current through it.Read the answer and worked solution →How much energy in kWh is consumed by a 1500 W appliance running for 4 hours?Read the answer and worked solution →Two bulbs of 60 W and 100 W are designed for 220 V. Which has higher resistance?Read the answer and worked solution →If the current through a resistor is doubled, the heat produced in the same time becomes:Read the answer and worked solution →CLASS10 · Physics · Tap the Electrical UnitsRead the answer and worked solution →CLASS10 · Physics · Ohm's Law — Gap FillRead the answer and worked solution →CLASS10 · Physics · Resistors — Series or ParallelRead the answer and worked solution →CLASS10 · Physics · Electric Power FormulasRead the answer and worked solution →What is the maximum resistance which can be made using five resistors each of $1/5\ \Omega$?Read the answer and worked solution →What is the minimum resistance which can be made using five resistors each of $1/5\ \Omega$?Read the answer and worked solution →Which of the following represents voltage?Read the answer and worked solution →The resistivity does not change ifRead the answer and worked solution →Fill the Ohm's-law blanksRead the answer and worked solution →

Worked practice questions

The SI unit of electric current is:

  1. ampere
  2. volt
  3. ohm
  4. coulomb
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Correct answer: A. ampere

Current is measured in amperes (A). Coulomb is the unit of charge, volt is the unit of potential difference, and ohm is the unit of resistance.

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A charge of 60 C passes through a wire in 2 minutes. Find the current.

  1. 30 A
  2. 120 A
  3. 0.5 A
  4. 0.5 mA
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Correct answer: C. 0.5 A

We have I = Q/t. That is I = 60/(2 × 60). That is I = 60/120. So I = 0.5 A.

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According to Ohm's law, V = ?

  1. I / R
  2. I − R
  3. I + R
  4. I · R
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Correct answer: D. I · R

V = I × R. Current and resistance multiply to give the potential difference required to drive that current.

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