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Punjab (PTB) · Chapter test · Free

2nd Year Physics Chapter 4 TestELECTROSTATICS

30 marks · 40 minutes · 21 questions. Covers: CHAP 16: ELECTROSTATICS.

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2nd Year Physics Chapter 4 Test

2nd Year · Physics · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

  1. Which medical application of capacitors delivers a life-saving shock to restore a normal heart rhythm?

    1. Defibrillator

    2. Ultrasound machine

    3. X-Ray filtration

    4. EEG signal recorder

  2. The capacitance C of a parallel plate capacitor depends upon:

    1. The magnitude of the charge only

    2. The applied voltage only

    3. The mass of the metal plates

    4. The geometry of the plates and the medium between them

  3. In a parallel plate capacitor, the electric field E between the plates is assumed to be uniform because:

    1. The plates are made of copper

    2. The voltage is alternating

    3. The distance d between the plates is small

    4. A vacuum is present between them

  4. When a slab of dielectric is placed between two oppositely charged plates, its atoms get:

    1. Ionized

    2. Polarized

    3. Demagnetized

    4. Conductive

  5. Why do we connect multiple capacitors together in a circuit combination?

    1. To reduce the battery voltage

    2. To increase the heat dissipation

    3. To obtain a desired capacitance

    4. To stop the flow of electric current

  6. Quantitatively, the electrostatic force between two stationary charges can be found by applying:

    1. Ohm's law

    2. Faraday's law

    3. Coulomb's law

    4. Lenz's law

  7. An insulating material placed between the plates of a capacitor is known as a:

    1. Conductor

    2. Resistor

    3. Dielectric

    4. Electrolyte

  8. What practical evidence shows that a charged capacitor stores energy?

    1. It changes color when fully charged

    2.  It automatically increases its own mass

    3. A thick wire connecting its plates becomes hot during discharging

    4.  It starts emitting visible light

  9. The SI unit of capacitance is:

    1. Coulomb

    2. Volt

    3. Farad (F)

    4. Joule

  10. In rectifier circuits, capacitors are widely used as filters for:

    1. Converting DC into AC

    2. Increasing the frequency of AC

    3. Smoothing pulsating DC into smooth DC

    4. Stopping the battery from charging

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. If the entire series combination is replaced by a single equivalent capacitor Ce, what will be its charge and potential difference?

  2. Define "Dielectric Constant" or relative permittivity.

  3. What is a capacitor and what is its primary function?

  4. How does the electric potential change with an increase in distance from a charge?

  5. What is time constant? Write its formula.

  6. What role does a capacitor play during the starting process of an electric fan motor?

  7. Describe the physical construction or connection scheme of a series combination of capacitors.

  8. Express the rule for the combined capacitance of capacitors connected in parallel.

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. Two capacitors of capacitances are connected in series and a potential difference of 300 volts is applied. Find the charge and potential difference for each capacitor.

  2. The potential difference between points A and B is VA - VB =84V, while the potential difference between points C and B is VC - VB =24V. What should be the work done on moving a charge from C to A?

  3. What is a capacitor? Find the capacitance of a parallel plate capacitor. What is the role of a dielectric in the capacitor?