Inter (Part-I) Bahawalpur 2014
Physics
Part I (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.

• Giga is equal to:

(a) 10³                        
(b) 10⁶
(c) 10⁹                        
(d)10¹²

• The complete requirements for a body to be n equilibrium are:

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

• The product of force and time is called

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

• The angle of which the maximum height and horizontal range of a projectile become equa; to each other is

(a) 30°
(b) 45°
(c) 60°
(d) 76°

• The value of escape Velocity for each is

(a) 11km/h                  
(b) 11km-1
(c) 1.1km/h                 
(d) 1.1km^-1

• 1 revaluation is equal to

(a) 90°                                
(b) 180°
(c) 270°                     
(d) 360°

• The angular version of F=ma is

(a) L=Iw                    
(b)
(c)                 
(d) F=

• The expression for the orbital velocity of satellite

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

• The terminal velocity of a droplet falling down under Gravity is directly proportional to the square of

(a) Its density             
(b) Its Radius
(c) Its Viscosity          
(d) Its Elasticity

• The mathematical expression for the restoring force is

(a) F=kx                     
(b) F=ma
(c)                           
(d) F=kx

• What is the value of constant β in the expression  

(a) 273                       
(b)
(c) 0.61                      
(d) 1.42          

• Two waves having same frequency and travelling in the same direction superimpose each other corresponding phenomena is called

(a) Interference          
(b) Beats
(c) Doppler Effect     
(d) Stationary waves  

• The apparent change in the pitch of sound due to relative motion is called

(a) Carnot theorem     
(b) Interference
(c) Doppler Effect     
(d) Beats

• A typical diffraction grating has certain number of lines per centimeter whose range is

(a) 40 to 50                 
(b) 400 to 5000          
(c) 400 to 500            
(d) 4000 to 5000

• The apparent change in the pitch of sound due to relative motion is called

(a) 5 to 50m             
(b) 50 to 100m         
(c) 50 to 1000m       
(d) 50 to 10,000m

• During adiabatic process, which factor remains constant

(a) Entropy                 
(b) Pressure    
(c) Volume                             
(d) Temperature

• An ideal reversible heat engine has

(a) 100% Efficiency
(b) 80%
(c) Highest Efficiency
(d) An efficiency which depends on the nature of working substance

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

Section-I

2. Write short answers any Eight (8) questions of the following

• Time period of a simple pendulum is measured by a stop watch. What types of errors are possible in time period?
• The vector sum if three vectors give zero resultant. What can be the possible orientation of the vectors?
• An object is thrown vertically upward. Discuss the sign of acceleration due to gravity, relative to velocity while the object is in air?
• A picture is suspended from a wall by two strings. Show by diagram the configuration of the string for which the tension in the string will be minimum
• A ball thrown with a speed of 0ms-1 in a direction 30o above the horizon. Determine its time of flight
• Cane the velocity of an object reverse the direction when acceleration is constant? If o give an example 
• A person is standing near a fast moving train. is there any danger that the fall towards it?
• Write the main source of errors
• How many Nanoseconds in one year?
• How can determine the uncertainty in time period?
• Show that
• Why you wear seat beat?

3. Write short answers any Eight (8) questions of the following  

• A girl drops a cup from a certain height which breaks which breaks into pieces. What energy changes are involved?
• When a rocket re-enters the atmosphere, its nose cone becomes very hot. Where does this heat energy come from?
• Define joule and Walt.
• Show that orbital angular momentum Lo=mvr
• What is meant by Moment of inertia? Explain its significance
• Differentiate between real and apparent weight?
• Show that in SHM the acceleration is zero when the velocity is greater and the velocity is zero when the acceleration is greater?
• What happens to the period of a simple pendulum if its length is doubled? What happens if the suspended mass is doubled?
• Name two characteristics of simple Harmonic Motion
• Why does sound travel faster in solids than in gases?
• How are beats useful in turning musical instruments?
• What is effect of density on speed of sound?

4. Write short answers ac y Six (6) questions of the following 

• Explain whether the Young’s experiment is an experiment  for studying interference or diffraction effect of light
• Why Polaroid sunglasses are better than ordinary sunglasses?
• What is Hygen’s principle?
• How power is lost in optical fiber through dispersion? Explain
• Write two conditions of total  internal reflection?
• What is tripple point of water?
• Specific heat of  construct a heat engine that will not expel heat into atmosphere?
• Can the mechanical energy be converted completely into heat energy? If so give example  

SECTION -II

Question #5
(a) define rectangular components of a vector. Discuss the vector addition of number of coplanar vectors by rectangular components method?
(b) two blocks of masses 2.0 kg and 0.50kg are attached at the two ends of a compressed spring. The elastic P.E stored in the spring is 10J . find the velocities of blocks if the spring delivers its energy to the blocks when released?
Question #6
(a) explain artificial gravity. Derive
(b) A 70kg man runs up a long flight of stairs in 4.0 s. the vertical height of the stirs is 4.5m. calculate his power output in watts.

Question #7
(a) what is the effect of temperature on speed of sound.  Derive mathematical expression for it as
(b) what should be length of simple pendulum whose period is 1.0 second at replace where g=9.8ms-2. What is frequency of such a pendulum?

Question #8
(a) discuss diffraction of x-rays by crystal. Also write down two applications of x-rays diffraction.
(b)  the turbine in a stream power plant takes steam from a boiler at 270oC and exhausts o=into a low temperature reservoir at 77oC. What is the maximum possible efficiency?

PARAT-III

Question #10

• (i) What is pitch of a screw Gauge?
• (ii) Define torque and give its units.
• (iii) How does the tie period of spring mass system changes if mass is doubled?
• (iv) Why is electronic timer considered more accurate?
• (v) What is meant by parallel?
• (vi) Define refractive index of a medium.
• (vii) What type of waves are produce in sonometer?
• (viii) What is meant by total internal reflection? Write down the procedure to find the velocity to find the velocity of second by end correction in a resonance tube.