Inter (Part-I) Multan Board 2015
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.

• Solid angle subtended at the center of sphere of radius 'r ' in steroidal is:-

  (A) 2π
  (B) 4π
  (C) 6π
  (D) 8π

• iˆ . ( ˆj × k^ˆ ) is equal to:-

  (A) 1
  (B) 2
  (C) 0
  (D) k^ˆ

• The range of projectile is same for the angle of projection of:-

  (A) 30^o & 45^o
  (B) 50^o & 30^o
  (C) 20^o & 60^o
  (D) 30^o & 60^o

• The distance covered by free falling body in two seconds is:-

  (A) 8m
  (B) 19.6m
  (C) 44.4 m
  (D) 49 m

• The K.E. of bullet of mass 500 gm moving at a speed of 200ms⁻¹ is:-

  (A) 250 J
  (B) 125 J
  (C) 2500 J
  (D) 10,000 J

• The diver spins faster when moment of inertia becomes:-

  (A) Smaller
  (B) Greater
  (C) Constant
  (D) Equal

• When a body moves in a circle, the angle between linear velocity v^r and angular velocity w^r is:-

(A) 180^o
(B) 90^o
(C) 60^o
(D) 45^o

• The speed of hoop at the bottom of inclined plane is:-

(A) gh
(B) 2gh
(C) 43 gh
(D) 34 gh

• One torr in Nm⁻² is expressed as:- 

(A) 130.5Nm⁻²
(B) 133.5Nm⁻²
(C) 140.2Nm⁻²
(D) 145.6Nm⁻²

• When a particle is moving along a circular path, its projection along the diameter performs:-

  (A)
  (B) Vibratory motion
  (C) Linear motion
  (D) Rotatory motion

• On loading the prong of a tuning fork with wax, the frequency of sound:-

  (A) Increases
  (B) Decreases
  (C) Remains same
  (D) First increases then decreases

• The wavelength of fundamental mode of vibration of an open end pipe is:-

  (A) 4l
  (B) 2l
  (C) l
  (D) l/4l

• Two tuning forks of frequencies 260 Hz and 256 Hz are sounded together, the number of beats per second is:-

(A) 4
(B) 258
(C) 2
(D) 516

• The blue colour of sky is due to:-

  (A) Diffraction
  (B) Reflection
  (C) Polarisation
  (D) Scattering 

• In Michelson’s experiment, the angle subtended by a side of eight sided mirror at the centre is:-

  (A) π/8
  (B) π/4
  (C) π/2
  (D) π

• Pascal is the unit of:-

(A) Pressure
(B) Force
(C) Tension
(D) Weight

• The efficiency of heat engine whose sink is at 17^oC and source at 200^oC is:-

  (A) 35 %
  (B) 65 %
  (C) 80 %
  (D) 90 %

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

Section I

2 Attempt any eight parts. 8 × 2 = 16

• Name several repetitive phenomena occurring in nature could be used reasonable time standards.
• Does a dimensional analysis give any information on constant of proportionality that may appear in any algebric expression? 5.348 × 10⁻² × 3.64 × 10⁴
• Using rules of Significant figures, compute up to appropriate  1.336 significant figures.
• Write dimensions of (i) Pressure (ii) Density (v) Define terms (i) Unit Vector and (ii) Position Vector (vi) Cay you add zero to a null vector?
• How would the two vectors of the same magnitude have to be oriented, if they were to be combined to give a resultant equal to a vector of the same magnitude?
• An object is thrown vertically upward. Discuss the sign of acceleration due to gravity, relative to velocity while the object is in air.
• Motion with constant velocity is a special case of motion with constant acceleration Is this statement true?
• Differentiate between Elastic and Inelastic collisions.
• Show that range of Projectile is maximum when projectile is thrown at angle of 45^o with the horizontal.
• Two row boats moving parallel in the same direction are pulled towards each other. Explain.

3 Attempt any eight parts. 8 × 2 = 16

• When a rocket re-enters the atmosphere, its nose cone becomes very hot. Where does this heat energy come from?
• An object has 1J potential energy. Explain what does it mean?
• How electrical energy can be obtained from sunlight by Indirect Conversion Method? (iv) Define Weightlessness and Gravity Free System. 
• Show that Orbital Angular Momentum L_o = mvr
• When mud flies off the tyre of a moving bicycle, in what direction does it fly?
• What happens to the period of a Simple pendulum if its length is doubled? What happens if the suspended mass is doubled?

• If a Mass Spring System is hung vertically and set into Oscillations, why does the motion eventually stop? 
• Define Simple Harmonic Motion. Express it mathematically. 
• Why does sound travel faster in solids than in gases?
• As a result of distant explosion, an observer senses a ground tremor and then hears the explosion. Explain the time difference. (xii) Define Beat and Beat Frequency. 

4 Attempt any six parts. 6 × 2 = 12

• Under what conditions two or more sources of light behave as coherent sources?
• Can visible light produce interference fringes?
• Why the Polaroid Sunglasses are better than Ordinary Sunglasses?
• What do you understand by Linear Magnification?
• Explain the difference between Angular Magnification and Resolving Power.
• Define Reversible Process and Irreversible Process.
• Does Entropy of a system increase or decrease due to friction?
• Specific heat of a gas at constant pressure is greater than specific heat at constant volume. Why?
• Is it possible to convert internal energy into mechanical energy? Explain with example. 

SECTION-II

NOTE: - Attempt any three questions of the following:-

Question #5
(a) Define scalar product of two vectors. Also write any four characteristics of scalar product. (1 + 4)
(b) A foot ball is thrown upward with an angle of 30^o with respect to the horizontal. To throw a 40 m pass what must be the initial speed of the ball? (3)

Question #6
(a) Define absolute gravitational P.E. Derive expression for the absolute value of gravitational P.E  of a body at a distance 'r ' from the center of the earth. (5)
(b) What should be the orbiting speed to launch a satellite in a circular orbit 900 km above the surface of earth? (Take M_e =6×10²⁴kg &R_e =6400km) (3)

Question #7
(a) What is Simple Pendulum? Show that it performs Simple Harmonic Motion. Hence derive formula for its time period. (5)
(b) Find the temperature at which the velocity of sound in air is two times its velocity at 10^oC . (3)

Question #8
(a) Explain the Young’s Double Slit Experiment to study the interference of light. (5)
(b) A glass light pipe in air will totally internally reflect a light ray if its angle of incidence  is at least 39^o . What is minimum angle for total internal reflection if pipe is in water? (refractive index of water = 1.33) (3)

Question #9
(a) What is Carnot Engine? Derive expression for the efficiency of Carnot Engine. 1 + 4
(b) Water flows through a hose, whose internal diameter is 1 cm at a speed of 1m ⁻¹ . What should be the diameter of nozzle if the water is to emerge at 21ms⁻¹? 3

SECTION-III (PRACTICAL)

Question #10
(A) Write answers of any four parts. 4 × 2 = 8

• What is meant by Zero Error?
• What is use of upper jaws and sliding strip of Vernier Caliper?
• Define Node and Antinode.
• Define Second Pendulum and what is its frequency.
• State second condition of Equilibrium.
• What types of waves are produced in sonometer, define them?
• The speed of sound at 0^oC is 332ms⁻¹. What should be the speed of sound at 40^oC ?
• What is meant by Index Correction?
• Write down the procedure of the experiment to find the speed of sound in air at 0^oC by using  1^st Resonance Method. 3

OR

Write down the procedure of experiment to verify that period of simple pendulum is independent of mass.

Answer the following questions on the basis of graph drawn below:- 2 × 2 = 4
(A) (i) Find the X–Intercept of the graph. (ii) Find the focal length from graph.
OR
(B) (i) Find the spring constant. (ii) What is the slope of graph?

Graph (A)

Graph (B)