Inter (Part-I) Faisalabad Board 2013
Physics
Part I (Objective Type)
Time Allowed: 20 Minutes 
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 circles. 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.

• The change in entropy of a system is given by:

(a)  
(b)   
(c)  
(d)

• Which one is true for isothermal process?

(a) Q = 0
(b) W = 0
(c) Q = W
(d) W = u

• The magnifying power of a simple microscope is :

(a) 
(b)        
(c)  
(d) 

• The center of Newton rings is dark due to:

(a)Constructive interference
(b) Destructive interference
(c) Diffraction
(d) Polarization

• If the organ pipe is open at both ends the frequency of fundamental harmonic is :

(a)
(b) 
(c) 
(d)

• The distance between node and an antinode is :

(a)  λ
(b) λ/2 
(c) λ/4
(d) 3λ/4

• If the string is made to vibrate in n loops then the wavelength of the stationary wave will:

(a)    l 
(b)    l   
(c)   
(d)       

• The product of time period and frequency is equal to :

(a) 3
(b) 2
(c) 1
(d) zero

• Which material has maximum visocity ?

(a) Glycerin
(b) Plasma
(c) Ethonal
(d) Water

• The dimension of angular acceleration is :

(a) [T-1]
(b) [T-2]
(c) [LT-2]
(d) [T-3]

• One radian is equal is:

(a) 360°
(b) 57.3°       
(c) 180°
(d) 55.3°

• Rotational K.E of the dise is:

(a)
(b)      
(c)  
(d)      

• Kilowatt hour is the unit of :

(a) Power
(b) Work      
(c) Force
(d) Momentum

• The range of the projectile is maximum when it is projected at an angle of :

(a) 20"
(b) 30°
(c).450
(d) 60°

• Change in momentum is called:

(a) Force
(b) Impulse
(c) Pressure
(d) Torque

• The vector in space has _______ compounds.

(a) Two
(b) Three      
(c) Four
(d) One

• One tera is equal to :

(a) 10¹⁰
(b) 10⁹
(c) l0¹²
(d) 10¹⁵

Inter (Part-I) Faisalabad Board 2013
Physics
Part I (Subjective)
Time Allowed: 2.10 Hours 
Max. Marks: 83 

Section I

Q2. Attempt any EIGHT shots questions.        (8 x 2 = 16)

• The period of simple pendulum is measured by a stop watch. What types of errors are possible in the time period?
• Do we fine it useful to have two units for the amount of substance , the kilogram and mole?
• How many seconds are there in 1 year and how many years are there in second?
• Write down four convections for indicating units.
• Two vectors have unequal magnitudes. Can their components that are equal in magnitude?
• Under what circumstance would a vector have components that are equal in magnitude?
• Describe the two conditions of equilibrium.
• Explain the circumstances in which the velocity are (i) parallel (ii) perpendicular to each other.
• Find the change in momentum for an object and subjected to a given force for a given time and state law of motion in terms of momentum .
• Define impulse . Does a moving object have impulse?
• Under what condition, the instantaneous and average velocities of a moving object become equal ?
• Why fog droplets appear to be suspended in air?

Q3. Attempt any EIGHT short questions.  (8 x 2 = 16)

• A boy uses a catapult to throw a stone which accidently smashes a Green house window. List the possible energy changes.
• In which case is more work done? When a 50 kg bag of books is lifted through 50 cm or when a 50kg crate is pushed through 2m across the floor with a force of 50N?
• What is relation between escape velocity and orbital velocity?
• Explain how many minimum number of geo-stationary satellites are required for global coverage of T.V. transmission ?
• Why mud files off the tyre of a moving bicycle, in what direction does it fly ? Explain it .
• Show that orbital angular momentum L0 = mvr
• Name two characteristics of simple harmonic motion.
• Does the acceleration of a simple harmoneic oscillator remains constant during its motion? Is acceleration ever zero '? Explain.
• If a mass spring system is hung vertically and set into oscillations , why does motion eventually stop?
• Is it possible for two identical waves travelling in the same direction along a string to give rise to stationary waves?
• Speed of sound in air at 0°C is 332ms . Find its speed at 20°C.
• What is the effect of pressure on the speed of sound?

Q4. Attempt any SIX short questions.        (6 x 2=12)

• Write the conditions for detectable interference of light.
• Why the Polariod sunglasses are better than ordinary sunglasses?
• How is the distance between the interference fringes affected by the separation between the slits of Young's  experiment?
• Why would it be advantageous to use blue light with a compound microscope?
• How the power is lost in optical fiber through dispersion?
• Find the relation for work done by heat at constant pressure.
• What do you mean by triple point of water?
• Does entropy of system increase or decrease due to friction?
• Is it possible to construct a heat engine that will not except heat into the atmosphere?

SECTION  II

Note: Attempt any Three questions from this section (8*3=24)

Attempt any THREE questions.        (8 x 3 = 24)
Question #5
(a) Define vector product. Give its four characteristics and two examples.
(b) Find the angle of projection of a projectile for which its maximum height and horizontal range are equal.
Question #6
(a) Define work . Prove that work done in a gravitational field is independent of path folioed.
(b) What is the least speed at which an aero plane can execute a vertical loop of I km radius so that there will be no tendency for the pilot to fall down at the highest point.

Question #7
(a) Discuss the eftect of temperature on the speed of sound in a gas.
(b) A simple pendulum is 50cm long . What will be its frequency of vibration at a plane where g = 9.8m / sec2

Question #8
(a) Explain the young 's double slit experiment to study the phenomena of interference.
(b) An astronomical telescope having magnifying power -or 5 consist of two thin leness 24cm apart. Find the focal length of lenses.

Question #9
(a) Define Cp,C1 and show CP - CV = R.
(b) How large must a heating duct be if air moving 3.0ms along it can replenish the air in a room of 300m' volume every 15min? Assume the air's density remains constant.

Attempt any THREE questions.        (5x 3 = 15)

Question #10(a)

• Differentiate between zero error and zero correction .
• What are two conditions of equilibrium
• What is Hook's law ? Explain .
• What are the conditions for simple harmonic motion?
• How stationary waves are produced in a stretched string?
• What is meant by end correction ?
• Can a convex lens are as diverging lens '? Explain .
• State Snell's law and give its mathematical relation.
• Write brief procedure for the determination of acceleration due to gravity by oscillating mass spring system .          

OR

• Write brief procedure to find the speed of sound in air at room temperature.