Inter (Part-I) Bahawalpur 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.

• A device based upon the Thermodynamic Property of matter is called

(a) Calorimeter
(b) Heat Engine
(c) Thermometer
(d) Voltmeter

• For a diatomic Cv = then Gamma “” for this gas is

(a) 5/7
(b) 4/35
(c) 7/5
(d) 35/4

• The minimum distance from eye at which an object appears to be distinct is:

(a) 15cm
(b) 20 cm
(c) 25cm
(d) 30cm

• Wavelength of X-rays is of the order of:

(a) 10^-8m
(b) 10^-5m
(c) 10^-10m
(d) 10^-4m

• The basic principle of beats is

(a) Interference
(b) Diffraction
(c) Reflection
(d) Refraction

• Speed of sound in Vacuum is

(a) 280m^-1
(b) 332ms^-51
(c) 333ms^-1
(d) Zero

• The distance between Node and Anti Node is equal to

(a) λ
(b) λ/2
(c) λ/2
(d) λ/4

• If mass of pendulum becomes half, then its terminal velocity will become

(a) Doubled
(b) Half
(c) Four Time
(d) Remain Same

• If Radius or Droplet becomes half, then its terminal velocity will become

(a) Doubled
(b) Half
(c) One Fourth
(d) Remain Same

• INTElAS VI satellite operators at Microwave Frequencies of

(a) 2,4,6,10 GHZ
(b) 4,6,11and 14 GHZ
(c) 4,6,11 and 14 GHZ
(d) 2,4,6and 14 GHZ

• Which theory is better about Gravitation

(a) Einstein
(b) Plank
(c) Newton
(d) Michelson

• The ratio of the moment of inertia of disc and hoop is

(a) 1/4
(b) 1/2
(c) 3/4
(d) 3/2

• The escape velocity can be determined by relation

(a) 1
(b) 2
(c) 3
(d) 4

• Slope of velocity time graph describe a physical quantity called

(a) Displacement
(b) Average Velocity
(c) Average Acceleration
(d) Momentum

• The angle of projection for which its maximum height and horizontal range are equal

(a) 46°
(b) 56°
(c) 76°
(d) 66°

• The magnitude of Cross and Dot {Product of two vectors are equal the angle between the vectors is

(a) 0°
(b) 90°
(c) 180°
(d) 45°

• Silicon is obtained from

(a) Water
(b) Metals
(c) Wood
(d) Sand

Inter (Part-I) Bahawalpur Board 2015
Physics
Part I (Subjective)
Time Allowed: 3.10 Hours 
Max. Marks: 83

Section I

Note: It is compulsory to attempt (8-8) parts each from Q.No.02 and Q.No.03 attempt any (6) part each from Q.No.04 and Q.No.03 Part-II while attempt Part III (Practical Part) according to the given instructions. Write same question No. and its part No as given in the question paper (22 x 2=44)

Part-I

Question #2

• How many years in one second?
• Can you add zero to a Null Vector? Explain.
• Name several repetitive phenomenons occurring in nature which could serve as reasonable lime standard. (iv) Find the dimensions and SI units, of confident al viscosity in F = 6
• Name two major types of errors in measurement and also define them.
• Show that the sum and difference of two perpendicular vectors of equal lengths are also perpendicular. (vii) Can a body rotates about its Centre of Gravity? Explain.
• Define Impulse and show that hew it is related to Liner Momentum?
• Can the velocity of an object reverse direction when acceleration is constant? If so give en example.
• Show that the range of a projectile is maximum when projectile is thrown at an angle of 45^° with the horizontal.
• A person is standing near a fast moving train. Is there any danger that he will fall towards if? Explain
• Differentiate between Elastic and In- Elastic Collisions, Explain how would a bouncing ball behave in each case?

Question #3

• Calculate work done In kilo joules in lifting a mass el 10 Kg ( at a steady velocity )through a vertical height of 10m.
• When a rocket re-enters the atmosphere, its nose cane becomes very hot. Where does this heat energy corns from?
• An object has 1J of Potential Energy. Explain what does it mean?
• Find the rotational K.E of a disc if its I=
• Why does a diver change his body positions before diving in the pool?
• What is meant by Angular Momentum? State Law of Conservation of Angular Momentum.
• Give Two examples of common phenomena in which resonance plays an Important role.
• Does the Acceleration of a Simple Harmonic Oscillator remain constant during its motion .Isthe acceleration ever zero. Explain.
• Explain relation between Total Energy, Potential Energy and Kinetic Energy for a body oscillating with SHM.
• Is it possible for two identical waves travelling in the same direction along a string to give doe to a stationary wave? 
• Explain the terms Crest, Trough, Node and Antinode.
• How are beats useful in tuning musical instruments?

Question #4

• How would you manage to get more orders of Spectra using a diffraction grating?
• How would you distinguish between Un- polarized and Plane Polarized Light?
• If a person was looking through a telescope at the lull moon, bow would the appearance of moon he changed by covering halt of the objective lens?
• State first law of Thermodynamics and give its mathematical form
• A thermos flask containing milk as a system is shaken rapidly. Does the temperature of milk rise?
• Name the four strokes of the petrol engine.
• Is it possible to convert internal energy into mechanical energy? Explain With an example.
• What is spectrometer? Write its essential components.
• What is Optical Rotation?

Part-II

Question #5
(a) Define and explain the Dot or Scalar Product. (5)
(b) A 1500 kg car has its velocity reduced from 20ms^-1 to 15ms^-1 in 3 sec How large was the average retarding force? (3)

Question #6
(a) Define Absolute Potential Energy. Derive a relation for Absolute Gravitational Potential Energy. (5)
(b) A 1000 kg car travelling with, a speed of 144 km^-1 round a curve of radius 100m. Find the necessary Centripetal Force. (3)

Question #7
(a) What is the effect of temperature on the speed of sound and derive the relation v_t = v_o +0.61t. (5)
(b) A black of mass 4.0 Kg is dropped from a height of 0.80 BO m on a spring of spring (3) constant 1960/m^-1.Find the maximum distance through which the spring will be compressed.

Question #8
(a) What is Simple Microscope? Calculate the Magnification of a Simple Microscope. (5)
(b) A light is incident normally on a grating which has 2500 lines per centimeter. Compute the Wavelength of Spectral Line for which the deviation in second order is 15.0. (5)

Question #9
(a) What is a Carnot Heat Engine? Show that efficiency of a Carnet Heat Engine depends an the temperatures of the hot and Cold reservoirs. (5)
(b) How large must a heating duct be if air moving 3.0m/s along it can replenish the air in a room of 300 m³ volume every 15 min. Assume the air's density remains constant. (5)

Part-III(Practical Part)

Give answers to any four questions/parts.(4 x 2 = 8)

Question #l0
(a) (i) Explain the terms Zero Error and Zero Correction.
(ii) State Hook's Law.
(iii) Define Pitch of the Screw Gauge.
(iv) What is a Second Pendulum
(v) Explain the two main defects of lens.
(vi) State the law of length for a vibrating string.
(vii) What is the role of water in the resonance tube?
(viii) what are the two conditions for total internal reflection?

Question #10
(b) Write down the procedure the experiment. Show that the time Period is independent of the Amplitude.

OR

Write down the procedure of the experiment determine the Focal Length of a Convex Lens by displacement method.

Question #10
(c) Answer the following questions on the basis of Graph given below, Per Graph. A
(i) Find the Spring Constant With unit from Graph.
(ii) Find extension when force is 5.6 N (4)

OR

For Graph.B
(i) Find the Focal Length from Graph.
(ii) Find “q” when P=20cm.