Inter (Part-I) Fedral Board 2013
Physics
Part I (Objective Type)
Time Allowed: 20 Minutes 
Max. Marks: 17

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

• The component of velocity that remains constant during the projectile motion is its -----------------------

(A) Vertical component
(B) Horizontal component
(C) Both A and B
(D) Initial component

• Two bodies of masses 2kg and 3kg having final velocities as 2m/sec and 3m/sec, respectively, are initially at rest. Their initial momentum will be ----?

(A) 7kg-m.sec1
(B) Zero kg-m.sec-1
(C) 60kg-m.sec-1
(D) None of these

• The waves which propagate by the oscillation of material particle are known as -----------------

(A) Magnetic waves
(B) Material waves
(C) E.M waves
(D) Mechanical waves

• In a diffraction grating, distance between the two adjacent slits in called -------

(A) Grating element
(B) Normal to grating
(C) Fringes
(D) Diffraction

• The X-component of a force of 10N acting along horizontal, will be ----------?

(A) 5N
(B) 10N
(C) 15N
(D) 20N

• To evaluate gravitational P.E, final point should be situated at ---------------?

(A) Zero
(B) 1000km
(C) Infinite
(D) None of these

• Y is the ratio of specific heat at --------------?

(A) Constant
(B) Constant
(C) Constant
(D) Constant

• To monitor the blood flow, ultrasonic waves of --------------- frequency are used.

(A) 5MHz→10MHz
(B) 25MHz→30MHz
(C) 9MHz→90MHz
(D) 20MHz→200MHz

• To determine the interplaner space, equation used is ----------------?

(A) dsinɵ=n
(B) 2dsin ɵ=n
(C) dsin ɵ/2=n
(D) sinɵ=n

• One dyne is equal to -------------------?

(A) 103N
(B) 105N
(C) 10-5N
(D) 10-3N

• If  then its unit vector will be ------------------?

(A)
(B)  
(C)  
(D)

• The slope of Velocity – Time graph at any instant represents ----------

(A) Gravity
(B) Average acceleration
(C) Instantaneous acceleration
(D) Velocity

• Thermal pollution is an inevitable consequence of the ------------

(A)1st law of thermodynamics
(B) 2nd lae=w of thermodynamics
(C) 2nd law of motion
(D) 1st law of motion

• The efficiency of a heat engine can be increased by increasing the temperature of ----------------?

(A) Engine
(B) Cold reservoir
(C) Hot reservoir
(D) None of these

• An organ pipe is 50 m long, with one end closed. Its fundamental frequency will be -------------.

(A) 250Hz
(B) 330Hz
(C) 360Hz
(D) 350Hz

• In a multimode step index fibre, density of the optical material decreases from --------------------

(A)  Edges to core
(B) Core → edges
(C) Even
(D) Multiple

• Glass-air boundary acts as a/an ---------------

(A) Mirror
(B) Glass
(C) Water
(D) Air

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

Section I

• Specific heat of gas at constant pressure is greater than specific heat at constant volume, why?
• Relate work done of a moving particle with its energy
• Why is the 1st law of motion also titled as the law of interia?
• Pair the physical quantities having the same dimension
  • Acceleration
  • Force
  • Work done
  • Rate of change of mom
  • Kinetic Energy
  • Gravity
• Two masses m1 and m2 are attached to a compressed spring at rest. What will be the ratio of their final velocity?
• Relate how orbital speed of a satellite depends on its radius
• Define Radian
• The magnitude of dot-product and cross product of two vectors is and 6, respectively, Find the angle between the vectors?
• Give any three examples of non-conventional energy sources
• Find the angle between
• Why would it be advantageous to use Blue light for a compound microscope?
• In optical fibre system, how can the time difference of different dispersions be reduced?
• What are the conditions used, while calculating time period of a simple pendulum?
• Write an expression that harmonics are integral multiple of fundamental note, for stationary waves.
• Compare expression of with the rate of change in velocity
• State the direction of the following vectors in simple situation
  • Angular momentum
  • Angular velocity
• Define Torr
• Certain globular particle has a density of 1246kgm-3. It fails through pure water  with a terminal speed of 3.0cmh-1, Find the radius of the particle
• The diameter and length of a metallic cylinder is 1.22cm and 5.35cm, respectively, What will be the volume of the cylinder?

Section-C  (Marks 26)

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

QUESTION# 3
(a) Prove that during one dimension elastic motion relative speed of approach is equal to the relative speed of separation? (06)
(b) A foot-ball is thrown upward with an angle of 30o with respect to horizontal. To throw a 40 m pass, what must be the initial speed of the ball? (04)
(c) Define impulse and show its relation to linear momentum    (03)

QUESTION# 4
(a) Derive Bernoulli’s equation for fluid    (07)
(b) Water flows through a hose, whose internal diameter is 1cm at a speed of 1ms^-1? What should be the diameter of the nozzle if the water is to emerge at speed of 21ms^-1? (03)
(c) In an orbiting space-station, would the blood pressure in major arteries of the legs be greater than the blood pressure in the major arteries of neck.  (03)

QUESTION# 5
(a) During Young’s Double Slit Experiment, explain how the interfringes distance also depends upon the wavelength of the light used.  (07)
(b) Explain the colours spectrum on an oil flim spreading over a wet footpath? (03)
(c) A light is incident normally ona grating which has 2500 lines/cm. Compute the wavelength of a spectral line for which the deviation of second order is 15.0°   (03)