Inter (Part-II) Multan Board 2014
Physics
Part II (Objective Type)
Time Allowed: 20 Minutes 
Max. Marks: 17

Note: Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer-book. Cutting or filling two or more circles will result in zero mark in that question.

Question #1
Circle the correct option i.e. A/B/C/D. Each part carries one mark.

• Presence of dielectric always

(a) Increase the electrostatic force 
(b) Decreases the electrostatic force
(c) Dose not effect
(d) Double the electrostatic force.

• The capacitance of a parallel plate capacitor in vacuum is:

(a) CVaC =  
(b) CVaC =
(c) CVaC =                  
(d) CVaC =

• When a wire of resistance R is cut into two equal parts its resistance becomes R/2 what happens to resistivity?

(a) Double
(b) Same
(c) Half
(d) One fourth

• The brightness of sport on CR0 screen is controlled by:

(a) Anode
(b) Cathode
(c) Grid
(d) Plates

• The field inside a solenoid is given by:

(a) μ_°nl
(b) μ_°n² l
(c) μ_°nl²
(d) μ_°Nl

• The application of mutual induction is a:

(a) D.C motor
(b) Radio
(c) Television
(d) Transformer

• Lenz's law is a consequence of the law of conservation of:

(a) Charge
(b) Current
(c) Energy
(d) Momentum

• The basic circuit element/elements in a D.0 circuit is:

(a) Resistor
(b) Inductor
(c) Capacitor
(d) Transistor

• In A.C wave form, negative peak is obtained at the phase angle of:

(a) 90°
(b) 120^°
(c) 270°
(d) 360°

• Curie temperature for iron is about:

(a) 0 K
(b) 750 K
(c) 1023K
(d) 378 K

• For non inverting amplifier, if R₁ = ohm, R₂ = 0 ohm then gain of amplifier is:

(a) –1
(b) Zero
(c) + 1
(d) Infinite

• The potential difference across the depletion region of Germanium is:

(a) 0.3 V
(b) 0.5 V
(c) 0.7 V
(d) 0.8 V

• The number of electrons emitted depend upon:

(a) Colour of target surface
(b) Shape of surface
(c) Frequency of incident light
(d) Intensity of incident light.

• In Helium Neon Laser, the discharge tube is filled with:

(a) 80% He, 20% Neon
(b) 85% He, 15% Neon
(c) 83% He, 17% Neon
(d) 90% He, 10 Neon

• The radius of first shell of Hydrogen atom was quantized, which is:

(a) 0.0053 mm
(b) 0.053 mm
(c) 0.53 mm
(d) 0.053 mm

• The dead time of Geiger-Muller counter is of the order of:

(a) Micro second
(b) Millisecond
(c) More than millisecond
(d) Nanosecond

• By emitting β particle and y particle simultaneously, the nucleus changes its charge by:

(a) Loses by 1 
(b) Increased by 1
(c) Increases by 2
(d) No change will be observed

Inter (Part-II) Multan Board 2014
Physics
Part II (Subjective)
Time Allowed: 2.10 Hours 
Max. Marks: 83 

Section I

Q.1 Attempt any eight parts. 8+2=16

• Do electrons tend to go to region of High Potential or of Low Potential?
• Electric lines of force never cross one another. Why?
• Convert 1 Joule into electron-volt.
• Prove that R – C =time constant in case of a Capacitor – Resistor Circuit.
• Why does the picture on a TV screen become distorted when a magnet is brought near the screen?
• Describe the change in the magnetic field inside a solenoid carrying a steady current "I" if the number of the turns is doubled but the length remains the same.
• Name the main parts of CRO.
• What is the Lorentz Force?
• What are the differences between Motor and a Generator'?
• Name the factors upon which the self-inductance depends.
• Show that Ԑ and have the same units.
• Does the induced emf in a circuit depend on the resistance of the circuit? Does the induced current depend upon the resistance of the circuit?

Q.3 Attempt any eight parts, 8x2 = 6

• What are the difficulties in testing whether the filament of a lighted bulb obeys Ohm's law?
• Is the filament resistance lower or higher in a 500W, 220V light bulb than in a 100W, 220V bulb?
• State Kirchhoff s First Rule.
• How many times per second will an incandescent lamp reach maximum brilliance when connected to a 50Hz source?
• What is meant by A.M and F.M?
• Which quantity, voltage or current leads in a capacitor and by how much angle?
• What is meant by para, diamagnetic substances?
• Why charge carriers are not present in the depletion region?
• What is effect of forward and reverse biasing of a diode on the width of the depletion region?
• Define modulus of Elasticity. Also discuss its three kinds.
• Write a short note on Super conductors.
• Define the Curie Temperature.

Q.4 Attempt any six parts, 6 x 4 = 12

• A solid is heated and begins to glow, why does it first appear red?
• Can pair production take place in vacuum? Explain.
• What advantages an electron microscope has over a optical microscope?
• In which region of the electromagnetic spectrum does the following series fall: (i)Lyman series (ii) Balmer series
• Differentiate between Line Spectrum and Band Spectrum.
• Define isotopes, give two examples.
• How can radioactivity help in the treatment of cancer
• Name the basic forces of nature.
• What do you mean by Quark?

Section-II

NOTE: Attempt any three questions.

Question #5
(a) Define electrostatic and how is it applied in Xerography. (5)
(b) 0.75A current flows through an iron wire when a battery of 1,5V is connected across its ends. The length of the wire is 5.0 m and its cross-sectional area is 2.5 x 107 m2 compute the resistivity of iron. (3)

Question #6
(a) What is a Cathode Ray Oscilloscope? Explain the functions of ( i) Cathode (ii) Grid (iii) Anodes (iv) Deflecting plates (v) Sweep Generator (5)
(b) The back emf in a motor is 120V when the motor is running at 1680 rev. per minute What is the back emf when the motor turns 3360 rev, per minute. (3)

Question #7
(a) Define resonance frequency. Evaluate a relation for resonance frequency in case of RLC series circuit. (5)
(b) A wire 2.5 to long and cross-section area 10^-5 m² is stretched by 1.5mm by a force of 100N in the elastic region. Calculate (a) the strain (b)Young's modulus, (3)

Question #8
(a) Describe de-Brogli's hypothesis and explain its confirmation through Davisson and Germer Experiment. (5)
(b) In a certain circuit, the transistor has a collector current of 10 mA and a base current of 40uA. What is the current gain of the transistor? (3)

Question #9
(a) Define and explain the principle construction and working of a solid State Detector. (5)
(b) Calculate the longest wavelength of radiation for the Paschen series. (3)

Section-III (Practical part)

Question #10
(a) Give answers to any Four Questions, 4 x 2 = 8

1. Draw the circuit diagram to find the Resistance of Galvanometer by Half Deflection Method.
2. What is an AND Circuit?
3. Give the uses of transistor in electronic circuit.
4. What is N-type semi conductor?
5. What is Rectification?
6. Does the filament bulb obey Ohm's Law?
7. What is meant by emf of a cell?
8. How is a voltmeter connected in a circuit?

 (b) Write down brief procedure to determine the resistance of a wire by slide wire bridge.

OR

Write down the brief procedure to study the variation of Photo-electric current with intensity of light using a Photo cell.

(c) Answer the questions given below on the basis of following graph:

• What do you conclude from graph?
• Find the slope of graph.