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

Note: Section-A is compulsory and comprises pages 1-2. All parts of this section are to be answered on the question paper itself. It should be completed in the first 25 minutes and handed over to the Centre Superintendent. Deleting/overwriting is not allowed. Do not use lead pencil.

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

• According to Charles law: 

(a) V∞T          
(b) V∞ n
(c) V∞1/T      
(d) V∞1/V

• In ease of adibatic process 1st law of thermodynamic is written as:

(a) W=∆u             
(b) W=Q
(c) W = Q-∆u       
(d) W =-∆u

• In Michelson's experiment the equation used to find the speed of light is

(a) 16 fc         
(b) 1/6 fd
(c) I6fd          
(d)16/fd

• In case of point source the shape of wave front is:

(a) Plane         
(b) Spherical
(c) Circular     
(d) Elliptical

• Two waves of same frequency and moving in the same direction produces:

(a) Interference          
(b) Diffraction
(c) Beats                     
(d) Stationary waves

• The value of content 'γ' for diatomic gas is:

(a) 1.67        
(b) 1.29       
(c) 1.45         
(c) 1.40

• Velocity of sound in air is independent of:

(a) Temperature          
(b) Pressure
(c) Density                 
(d) Medium

• One complete round trip of a vibrating body is called:

(a) Frequency            
(b) Time period
(c) Vibration             
(d) Amplitude

• The pressure will be low where the speed of fluid is:

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

• Angular momentum of a rigid body is given by:

(a) I2                
(b) I2
(c) I22             
(d) I

• In angular motion the cenntripetal force Fc is:

(a) m2r         
(b) mr2
(c) mr 2       
(d) mr2 2

• One revolution is equal to:

(a) π rad         
(b) 2π rad
(c) π/2rad       
(d) π/4rad

• The commercial unit of electric energy is:

(a) Kilowatt-hour       
(b) Watt
(c) Watt-hour             
(d) Kilowatt

• The rate of change of momentum is equal to:

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

• The area under the velocity time graph gives:

(a) Force                    
(b) Acceleration
(c) Distance              
(d) Torque

• The magnitude of the resultant of two forces 6N and 8N acting at right angle is:

(a) 6N              
(b) 10N
(c) 14N           
(d) 16N

• Which is a base quantity?

(a) Time          
(b) Force
(c) Power       
(d) Velocity

Inter (Part-I) Faisalabad 2015
Physics
Part I (Subjective)
Time Allowed: 2.10 Hours 
Max. Marks: 83 

Section I

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

• Write the dimensions of pressure and density.
• The wavelength  of a wave depends on the speffl V of the wave and its frequency f. knowing that [] = [ L] , [V] = [LT-1 ]and [f]=[T-1] .
• Decide which of these is correct? f =   or f =
• Draw a table for base units.
• Differentiate between random error and systematic error.
• The vector sum of three vectors gives a zero resultant. What can be the orientation of the vectors?
• Can the magnitude of a vector have a negative value?
• Under what circumference .would a vector have components that are equal in magnitude?
• State Newton's second law of motion.
• What is the difference between uniform and variable velocity?
• Define range of the projectile.
• Explain the circumstances in which the velocity V and acceleration a of a car are: (a) anti-parallel            (b) perpendicular to one another,
• Two row boats moving parallel in the same direction are pulled towards each other. Explain.

3. Attempt any EIGHT short questions.    (8 X 2 =16)

• Name some non-conventional energy sources.
• Calculate, the work done in kilo-joules in lifting a mass of 10kg
• Through a vertical height of 10m.
• State work energy relation and write down its equation.
• Why does a driver change his body position before and after diving in the pool?
• Explain how many minimum number of .geo-stationary satellites are require for global coverage of T. V. transmission?
• What is real and apparent weight?
• Name the characteristics of simple harmonic motion.
• Show that in .SHM the acceleration is zero when the velocity is greatest and velocity is zero when the acceleration is greatest,
• Calculate the length of the simple pendulum which completes one vibration in one second,
• What is the effect of variation of temperature on speed of sound in a gas?
• How are beats useful in tuning musical instruments?
• Which is richer in harmonics? An open organ pipe or a closed organ pipe?

4. Attempt any SIX short questions. (6 X 2 =12)
How would you manage to get more orders of spectra using a different grating?
An oil film spreading over a wet footpath shows colours. Explain how does it happen?
Why central spot of Newton's rings is dark?
If a person was looking through a telescope at the full moon how
Would the appearance of the moon be ch4nged by covering half of the objective lens?
How the power is lost in optical fiber through dispersion?
A thermos flask containing milk as a system is shaken rapidly. Does the temperature of milk rise?           
Does entropy of a system increase or decrease due to friction?
Why is the average velocity of the molecules in a gas zero but the gas zero of the square of velocities is not zero?
Define second law of thermodynamics,

SECTION II

Attempt any THREE questions.                                      (8 X 3 =24)

Question #5
(a) What is elastic collision? Discuss elastic collision of two balls in one dimension and calculate their final velocities if target was its at rest;
(b) Find the angle between the two vectors.  

Question #6
(a) What type of difficulties face by astronauts to stay in an artificial satellite for a long period and how to overcome this difficulty? Derive an expression for frequency of an artificial gravity.
(b) I 000kg automobile at top of an incline 10m high and 100m long is released and rolls down the hill. What is it speed at the bottom of the incline if the average retarding force due to friction is 480N?

Question #7
(a)Define Doppler's effect. Drive apparent frequency if: (i)Observer moves towards the source.
(b)Observer moves away from the source. (i)A simple pendulum is 50.0cm long. What will be its frequency of vibration at a place where g 9.8ms-2.

Question #8
(a) What is simple microscope? Derive relation for its magnification.
(b) Sodium light ( =589nm) incident normally on a grating having 3000 lines per centimeter. What is the highest order of the spectrum obtained with this grating?

Question #9
(a) Explain the working of typical four stroke petrol engine and compare it with a diesel engme.
(b) The pipe near the lower end of a large water storage tank develops a small leak and a stream of water shoots from it. The top of water in the tank’s 15mm above the point of leak. With what speed does the water rush from the hole.

SECTION III

Attempt any THREE questions.                            (5 X 3 = 15)
Question #10 (a)

• flow does the electronic timer measure time of free fall accurately?
• A student measured the diameter of cylinder as 3.45cm by a cylinder caliper having least count -v 0.0 1 cm. But-later on he observes a zero error in the instrument and find zero of tell vernier scale lies to the right of the zero of principal scale and 4th division of the vernier scale faces any division or the principal scale. Find the correct value of diameter of cylinder.
• How does the angle of deviation very with the angle of incidence in case prism?
• Does ithe critical angle of a transparent material varies with the colour?
• Design a table of observations to prove the law of length by, using the vibrations in the string of resonance.
• Why a simple pendulum is called simple?
• What is wavelength?
• What is magnification?

(b) Write down the brief procedure to show experimentally that time period of simple pendulum is independent of amplitude.
OR
Write down the brief procedure to determine experimentally the –focal length of a convex lens by displacement method.

(c) Answer the following Questions on the basic of graph given below.
(i)What can you conclude from the graph?
(ii)Find the value of (3.4)2? From the graph. 
(iii)Determine the value of  from the graph.
(b)(i) What can you conclude from the graph?
Find the slope from the graph.