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Punjab (PTB) · Quarter book test · Free

2nd Year Physics 2nd Quarter Book Paper

40 marks · 1 hour · 28 questions. Covers: CHAP 16: ELECTROSTATICS, CHAP 17: ALTERNATING CURRENT, CHAP 18: QUANTUM PHYSICS.

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2nd Year Physics 2nd Quarter Book Paper

2nd Year · Physics · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 40Time: 1 hour

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

  1. Through which of the AC-circuit elements both emf and current are in phase?

    1. Resistance

    2. Inductor

    3. Capacitor

    4. LED

  2. Quanta is the plural form of:

    1. Quantum

    2. Quark

    3. Quarkum

    4. Quantae

  3. 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

  4. An alternating current (AC) varies sinusoidally and can be represented by time-dependent:

    1. Linear functions

    2. Sine or cosine functions

    3. Logarithmic functions

    4. Exponential functions

  5. The current measured in a photoelectric circuit when light shines on the cathode is known as:

    1. Alternating current

    2. Thermal current

    3. Photoelectric current 

    4. Saturation voltage

  6. 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

  7. Power dissipation in a purely resistive AC circuit is directly proportional to the:

    1. Square of the current

    2. Square root of the current

    3. Inverse of the current

    4. Square of the resistance

  8. If the intensity of the incident light is increased, what happens to the photoelectric current?

    1. It increases

    2. It decreases

    3. It remains unchanged

    4. It drops to zero

  9. 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

  10. Name of device that is used as a part of charging circuit for mobile phones is:

    1. Full-wave bridge rectifier

    2. Half-wave rectifier

    3. AC generator

    4. Battery

  11. Using uncertainty principle, it can be proved that:

    1. Lght has particle nature

    2. Light has wave nature

    3. Electron lies out of the nucleus

    4. There is always uncertainty in measuring accurately energy and momentum for atomic particles

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

    1. Ionized

    2. Polarized

    3. Demagnetized

    4. Conductive

Q2. Short questions (Attempt any 8 of 12 · 8 × 2 = 16)

  1. Write the formula for the relativistic momentum of a photon in terms of its energy.

  2. Explain how an induction cooktop uses a parallel RLC circuit to heat metal cookware.

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

  4. Calculate or state the numerical value of the Compton Wavelength for an electron.

  5. Name four real-world devices or fields where mutual inductance finds practical applications.

  6. Define "Dielectric Constant" or relative permittivity.

  7. When does light behave as a wave and when does it behaves as consisted of particles?

  8. Explain how resistance affects oscillations in an RLC circuit using its mechanical analogy.

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

  10. Write down Einstein's photoelectric equation and define each of its variables.

  11. Why does a capacitor block DC but allow AC to pass?

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

Q3. Long questions (Attempt any 3 of 4 · 3 × 4 = 12)

  1. Explain the phenomena of Pair Production and Annihilation of Matter.

  2. 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.

  3. A 50 Hz AC of peak value 1 A flows through primary coil of a transformer. If the mutual inductance between the primary and secondary be 1.5 H, then find the mean value of induced voltage.

  4. Calculate the threshold frequency for sodium metal whose work function is 2.28 eV and the value of h is .