Inter (Part-I) Gujranwala Board 2015
Physics(New Scheme)
Paper Objective Type
Time: 20 Minute
Max. Marks:17
Note: You have four choices for each objective type question as A,B,C and D. The choice which you think is correct; fill that circle in front of that question number. Use marker or pen to fill the circle. Cutting or filling two or more circles will result in zero mark in that question. Attempt as many questions as given in objective type question paper and leave others blank.

• One Radian is equal to:

(a)77.3⁰
(b) 57.3⁰
(c) 67.3⁰
(d) 47.3⁰

• Earth receive large amount of energy directly from:

(a) Wind
(b) Water
(c) Sun
(d) Moon

• If the force acting on a body is doubled, then the acceleration becomes:

(a) Double
(b) Half
(c) One-forth
(d) Constant

• Horizontal is equal for the angles:

(a) 30⁰ and 40⁰
(b) 30⁰ and 50⁰
(c) 30⁰ and 60⁰
(d) 30⁰ and 90⁰

• If R_x is negative and R_y is positive, then the resultant vector lies in:

(a) 2^nd quadrant
(b) 3^rd quadrant
(c) 4^th quadrant
(d) 1^st quadrant

• Significant figures in 0.00876 are:

(a) 3
(b) 4
(c) 5
(d) 6

• Environmental crises are known as:

(a) Population crises
(b) Entropy crises
(c) War crises
(d) Mass crises

• Ideal gas law is:

(a) PT=NUK
(b) P=NKT
(c) PV=nRT
(d) P=nRT

• Repeaters are placed in the new system at a distance of:

  (a) 30/km
  (b) 50/km
  (c) 80/km
  (d) 100/km

• Diffraction is a special type of:

(a) Interference
(b) Polarization
(c) Reflection
(d) Refraction

• Longitudinal waves are also known as:

(a) Stationary waves
(b) Transverse waves
(c) Compressional waves
(d) Electromagnetic waves

• Radar system is an application of:

(a) Chemical effect
(b) Electric effect
(c) Magnetic effect
(d) Doppler’s effect

• Tuning fork is a source of:

(a) Energy
(b) Heat
(c) Light
(d) Sound

• Tuning of radio is the best example of:

(a) Mechanical Resonance
(b) Electrical Resonance
(c) Magnetic Resonance
(d) Musical Resonance

• Pressure will be low where speed of fluid is:

(a) Zero
(b) High
(c) Low
(d) Medium

• Weight of a body at the centre if earth is:

(a) Maximum
(b) Minimum
(c) Zero
(d) Infinite

• Satellites are the objects that orbit around the:

(a) Moon
(b) Sun
(c) Earth
(d) Star 

Inter (Part-I) Gujranwala Board 2015
Physics(New Scheme)
Paper Subjective Type
Time: 3:10 Hours
Max. Marks:83
Note: Section I is compulsory. Attempt ant three (3) questions from Section II and any three (3) parts Section-I from Section III.

Q2. Write short answers to any EIGHT questions: (2x8=16)

• Define precision and accuracy.
• Show that Einstein equation E=mc² is dimensionally consistent.
• Name several repetitive phenomenons occurring in nature which could serve as reasonable time standards.
• What are supplementary units? Define only one unit.
• Define the multiplications of a vector by a scalar.
• The vector sum of three vectors given a zero resultant. What can be orientation of the vectors?
• Can a body rotate about its centre of gravity under the action of its weight?
• Define instantaneous velocity if a moving body.
• Can the velocity of an object reserve the direction when acceleration is constant? Is so, give an example?
• Define impulse and show that it is related to linear momentum.
• Explain what is meant by projectile motion.
• Two row boats moving parallel in the same direction are pulled towards each other. Explain.

Q3: Write short answers to any EIGHT questions: (2x8=16)

• An object has 1 J potential energy. Explain what does it mean?
• A girl drops a cup from a certain height, which breaks into pieces. What energy changes are involved?
• How electrical energy can be obtained by using tides?
• Show that orbital angular momentum L_o=mvr.
• Why does a driver change his body positions before and after diving in the pool?
• What is meant by momentum of inertia? Explain its significance.
• Does the acceleration of a simple harmonic oscillator remain constant during its motion? Is the acceleration ever zero?
• Describe some common phenomenon on which resonance plays an important role.
• Define sharpness of resonance.
• Why does sound travel faster in solid than in gases?
• How should a sound source move with respect to an observer so that the frequency of its sound does not change?
• Explain “Principle of Superposition”.

Q4: Write short answers to any SIX questions: (2x6=12)

• Why are Polaroid sunglasses better than ordinary sunglasses?
• Under what conditions two or more sources of light behave as coherent sources?
• If a person was looking through a telescope at the full moon, how would the appearance of the moon be changed by covering half of the objective lens?
• How is power lost in optical fiber through dispersion? Explain.
• Draw sketch showing the difference light paths through a single mode and multi mode fiber.
• Derive Boyle’s Law from kinetic theory of gases.
• What happens to the temperature of the room when an air conditioner is left running on a table in the middle of the room?
• Why does the pressure of a gas in a car tyre increases when it is driven through some distance?
• Specific heat of gas at constant pressure is greater than specific heat at constant volume. Why?

(SECTION-II)

Q5. (a) State and explain the law of conservation of momentum. (5)

(b) What is unit vector in the direction of the vector=Ȃ4î+3ĵ? (3)

Q6. (a) Define centripetal force; derive a relation for centripetal force. (5)

(b) a man pushes a lawn mower with 40N force direction at an angle of 20⁰ downward from the horizontal. Find the work done by the man as he cuts a strip of grass 20 m long. (3)

Q7: (a) What is a simple pendulum? Show that simple pendulum executes SHM. Find out its time period. (1,3,1)

(b) An organ pipe has a lengthy of 50cm. find the frequency of its fundamental note when it is open at both ends. (3)

Q8: What is “Astronomical telescope”? Give its construction and working. Also find its magnifying power. (1,1,1,2)

(b) Blue light of wavelength 480nm illuminates a diffraction grating. The second order imagines is formed at an angle of 30⁰ from the central image. How many lines in a centimeter of the grating have been ruled? (3)

Q9. (a) Show that the difference of molar specific heat of a gas at constant pressure to the molar specific heat at constant volume is equal to universal gas constant. (5)

(b) What gauge pressure is required in the city mains for a stream from a fire hose connected to the mains to reach a vertical height of 15 m? (3)

(SECTION-III Practical)

(A) Give answer of any FOUR questions. (2x4=8)

• What Is zero correction?
• What is least count of a screw gauge?
• Define spring constant of spring.
• Define total internal reflection.
• What do you mean by end correction?
• Differentiate between dynamic and static equilibrium.
• How parallax is removed?
• Differentiate between principle focus and focal length.

(B) Write down the brief procedure to determine experimentally the value of g by free fall method using an electronic time/ticker timer. (3)

OR

Write down the brief procedure to determine experimentally the focal length of a convex lens by displacement method. (4)

(C) Answer the following questions on the basic of the graph below:

(i) Find value of g from graph A_o.

(ii) Find time T for l =70 cm.

Image graph

(i). Find focal length from graph B.

(ii) Find p when q=25 cm.

Image graph.