Inter (Part-I) Sargodha 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.

• The ratio of l nanometer to l attometer is:

(A) 10⁹
(B) 10⁸
(C) 10^-9
(D) 10^-8

• The vector projectile (x ) is

(A) θ
(B)I
(C) A²
(D) zero

• The range of projectile is same for

(A) 0^°,45°
(B)35°,55°
(C) 15^° ,60^°
(D) 30°,75°

• The Ballistic missiles me Wed only for

(A) Long Ranges
(B) Short Range
(C) Medium Range
(D) Constant Range

• Work has dimension like

(A) Torque
(B) Momentum
(C) Velocity
(D) Power

• 36° is equal to

(A) π/8
(B) π/6
(C) π/5
(D) π/12

• One Radial is equal to

(A) 75.3°
(B) 57.3°
(C) 35.7°
(D) 73.5°

• Centripetal acceleration is silo called

(A)Tangential
(B) Radial
(C) Angular
(D) Rotational

• The unit of viscosity in S.I system is

(A) Kg ^-1ms^-1
(B) Kg ^-1s^-1
(C) Kg ^-1m^-1 s
(D) Kg ms^-1

• The frequency of second pendulum in

(A) 1 Hz
(B) 5 Hz
(C) 5 Hz
(D) 2Hz

• The distance between consecutive Node and Anti-Node

(A) λ
(B) λ/2
(C) 2 λ
(D) λ/4

• The speed of sound is greatest in

(A) Air
(B) Steel
(C) Ammonia
(D) Water

• The distance covered by wave in 1-see is

(A) Wavelength
(B) wave number
(C) Frequency
(D) Wave speed

• Angle between ray of light and wave front is

(A) 0'
(B) Al
(C) 96¹¹
(D)120"

• The focal length Convex lense is

(A) Negative
(B) Positive
(C) Large
(D) Small

• Heat is form of

(A) Power
(B) Momentum
(C) Energy
(D) Toque

• The Celsius scale from

(A) 32°C
(B) 273°C
(C) C°C
(D) 100°C

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

Section I

2. Answer briefly any Eight parts from the following. 8x2=16

• Write the dimensions of (a) Pressure (b) density
• Why do we fad it useful m have two units for the amount of substance, the kilogram and the mole.
• The period of simple pendulum is measured by a stop watch. What type of MOTS are possible in the time period.
• Define random error and systematic error
• The vector sum of three Vectors gives a zero resultant. What can be the orientation of the vectors.
• If + = , what can you say about the component of the two vectors.
• An object is thrown vertically upward. Discuss the sign of acceleration dm so gravity, relative to velocity, while the object is in air.
• Explain the circumstances in which the velocity ‘V’ and acceleration 'a' of a Car are
• Parallel (b)Perpendicular to one another.
• Define impulse and show that how it is related to linear momentum.
• Does a moving object have impulse?
• Why fog droplets apses, to be suspended in air.

3. Answer briefly any eight from the following 8x 2= 16

• What sort of energy is in the following (a) Compressed seeing (b) Water in high dam.
• A girl does a cup from a certain height whish breaks into place, what energy changes are involved.
• Write down two sources of energy which are renewable.
• Why does a dives change his but positions before and after diving in the pool.
• Explain what is meant by centripetal force and why it must be furnished so on object if the object is to follow a circular path?
• What is the difference between real and apparent weights.
• Does frequency depends on amplitude for harmonic oscillators.
• Define a) resonance b) damping.
• What happens to the period of a simple pendulum if its length is doubled? What happens if the suspended mass is doubled?
• Write down the effects of variation of pressure and density on time speed of sound in a gas.
• How are beats useful in tuning musical instruments?
• What is a reder?

4. Answer briefly any six parts from the following:- 6x 2 =12

• How is the distance between interference fringes effected by the separation between the olio of young's experiment? Can fringes disappear?
• Why the polaroid sunglasses are better than ordinary^, sunglasses?
• Stale Huygon’s principle.
• How Convex Lens act as magnifying glass?
• Why would it be advantageous to use blue light with a compound microscope?
• Can the mechanical energy be convened completely into heat energy ? If so give an example.
• A thermos flask containing milk as a system is shaken rapidly. Does the temperature of milk rise?
• Why we reduce pressure in the tyre while moving on motorway?
• Is it possible to construct a heat engine that will not expel heat into the atmosphere?

Section---II

Note: Attempt any three questions. (8x3=24)

Question #5
(a) What is meant by projectile motion. Dire expressions for (i) The time of flight (ii) The range of Projectile.
(b) Prove that the two vectors  =ȋ+ĵ+Ќ and =4ȋ+ĵ5Ќ are mutually perpendicular.

Question #6
(a) Define absolute potential energy. Derive its mathematical expression.
(b) What is the least speed at an aeroplane can execute a vertical loop of I km radius so that there will be no tendency for the pilot to fall down at the highest point?

Question #7
(a) What is Doppler's effect? What is the change in pitch of sound wave, when source is moving towards or away from stationary observer?
(b) What should be the length of simple pendulum whose period is l.0 second at a place where g =9.8ms^-2

Question #8
(a) Explam the diffraction of x-rays by crystals.
(b) A telescope is mark of an objective of focal 20 cm and an eye piece of 5cm, both convex lenses. Find the angular magnification.

Question #9
(a) State and explain Bernoulli's equation.
(b) A Carnot Hest Engine Utilises an ideal Gas. The some temperance is 227^°C and the sill temperature is 127^°C .Find the efficiency of the Engine.

Section .--- III (PRACTICAL)

Question #10
(a) Write answers of any Four parts (4x2=08)

• Define principal focus and focal length.
• What is meant by end correction?
• What is the value of “g" at the centre and surface of earth?
• Find the length of pendulum if its time period is 1.0 seconds.
• Define moment of criteria and give its units
• State hook's law and what is ins limitation?
• Explain torque.
• Write dowm the uses of vernier caliper.

(b) Write dowm the procedure to verify the law of length by using sonometer. (03)

……..OR……….

Write down the procedure of the experiment to find the value of ‘g’ by oscillating spring-mass system.

(c) Write the answers on the basis of graph. ( 2+2)

(i) Find the focal length from graph (Graph A)
(ii) Find the value of pq for p+q=22 cm,

………..OR………….

(i) Find the slope of the graph.
(ii) Find the value of x when t=6 sec. (Graph B)

(IMAGES)