Inter (Part-I) Fedral 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.

• Light year is the unit of         

A) Time   
B) Distance
C) Light intensity
D) Speed of light

• The moment of force is called     

A) Torque
B) Impulse
C) Angular momentum
D) Force

• If ‘Rx’ is negative and ‘Ry’ component is positive, the direction of resultant ‘R’    is__________

A)   θ = ᶲ      
B)  θ =180° -ᶲ
C) θ =180° + ᶲ
D) 360° -ᶲ

• If the range of projectile is half to its maximum range, the angle of projection is

A) 30°      
B) 22.5°
C) 15°      
D) 45°

• The unit of Impulse is      

A) Newton          
B) Joule-sec
C) Joule   
D) Newton-sec

• The energy released by burning 1 litre of petrol is         

A) 1000 J 
B) 7 x 105 J
C) 5 x 1077 J       
D) 4 x 105 J

• The height of a geostationary satellite above the equator is      

A) 6.4 x 10⁶m
B) 3.6 x 10⁷m
C) 3.6 x 10^-7m
D) 6 x 10²⁴m

• The expression for orbital speed of artificial satellite is __________ 

A) V=
B) V=/r
C) V= 
D) V=

• Which of the following curves represents the motion of water droplet?

A)
B)
C)
D)

• The instantaneous velocity of mass spring system is_________  

A) v=v°                   
B) v=v°.
C) v=x°
D) v=

• If a pipe is closed at one end and open at the other, the fundamental note produced by it is

A) f1= 
B) f1= 
C) f1= 
D) None of these

• Colours seen on oily water surface are due to the_______      

A) Interference of light
B) Diffraction of light
C) Polarization of light
D) Refraction of light

• The technique used to study the structure of haemoglobin is   

A) X-rays diffraction
B) Newton's rings
C) Polarization
D) Interference

• The near point of normal human eye is

A) 25 m   
B) 250 mm
C) 2.5 cm
D) None of these

• The speed of light in vacuum is

A) 3 x 108cm/sec
B) 3 x 1010cm/sec
C) 3 x 109cmIsec
D) None of these

• The relationship between absolute temperature of an ideal gas and average translational kinetic energy is_________

A) T = <  mV2 >
B)  T=< mv2>
C)  T = <  mV2 >
D) T = <  mV2 >

• The cloud formation in atmosphere iIs an example of

A) Isothermal Process
B) Adiabatic Process
C) Isobaric Process
D) Isochoric Process

Inter (Part-I) Fedral Board 2014
Physics
Part I (Subjective)
Time Allowed: 3.10 Hours 
Max. Marks: 83

SECTION- B (Marks 42)

Q.2 Answer any FOURTEEN parts. The answer to each part should not exceed 3 to 4 lines.            (14 x 3 = 42)

• Show that the expression f = dimensionally correct, when 'f' is the frequency of vibrations on stretched string of tension ’F’ length ‘l’ and mass 'm'.
• Why is it easier to open a tightened nut with a long spanner?
• What is the unit vector in the direction of vector A = 4ȋ+3ĵ?
• A projectile is thrown with initial velocity 19.6m / sec at an angle 30° with the horizontal. How much time it will take to reach the maximum height?
• A girl drops a cup from a certain height, which breaks into pieces. What are the energy changes involved?
• The absolute potential energy of a body on the surface of earth is negative. What does it mean?
• Define Radian.
• What is Einstein's view of gravitation?
• Explain the working of a carbuoretor of a motor-car using Bernoulli's principle.
• What is Torr? How is it related with Pascal?
• A simple pendulum is 50.0 cm long. What will be its frequency of vibration at a place where g = 9. 8m. /sec2?
• A body of mass 4 kg is attached to a spring of spring constant 19 6 N / m and set into vibration. . What is its vibrational angular frequency?
• What is Laplace correction?
• What are the coherent sources of lights?
• In a double slit experiment the second order maximum occurs at θ= 0.25°.The wavelength is 650 nm. Determine the slit separation.
• An astronomical telescope having magnifying power of 5 consists of two thin lenses 24 cm apart. Find the focal lengths of the lenses.
• Calculate the critical angle for an optical fibre having core of refractive index 1.50 and cladding of refractive index 1.48.
• Write the postulates of kinetic theory of gases.
• A heat engine perform 100 J of work and at the same time rejects 400 J of heat energy to the cold reservoir. What is the efficiency?

SECTION - C (Marks 26)

Note: Attempt any TWO questions. All questions carry equal marks.   (2 x 13 = 26)

Question #3
(a) State Rotational Kinetic energy. Derive the expression of rotational kinetic energy of a disc and a hoop. Why does a disc- move faster than a hoop on an inclined plane?
b. According to Ohm's law V = IR . If the potential difference V' and resulting current 'I' are V = 5.2 + 0.1 volts, l = 0.84 ± 0.05 Amp, find the value of 'R' and its uncertainty.

Question #4
(a) What is the law of conservation of energy? How is it verified in mass- spring system?
(b) A church organ consists of pipes, each open at one end, of different lengths. The minimum length is 30 mm and longest is 4 m. Calculate the frequency range of the fundamental notes? (Speed of sound = 340 m/sec).

Question #5
(a) What are the Molar Specific heats of a gas? Prove that molar specific heat of a gas at constant pressure is greater than molar specific heat at constant volume.
(b). A compound microscope has lenses of focal length 1.0 cm and 3.0 cm. An object is placed 1.2 cm from the object lens. If a virtual image is formed 25 cm from the eye, calculate the separation of the lenses and the magnification of the instrument.