Inter (Part-I)
Gujranwala Board 2014
Physics (New Scheme)
Paper : I
(Objective)
Time: 20 Minutes
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 with marker or pen on the answer book provided. Cutting or filling two or more circles will result in zero mark in that question. Attempt as many questions as given in objective type question paper and leave others blank.

• A body of mass 2 kg moving with velocity of 4 ms^-1 has K.E. equal to

(A) 16 J
(B) 8 J
(C)32 J
(C)2 J

• The wavelength of X-rays is of order of

(A) 10 m
(B) 10^-10 m
(C) 10^-2 m
(D) 10 cm

• Multimode step index fibre is useful for

(A) long distance
(B) short distance
(C) very long distance
(D) infinite distance

• The velocity of sound in air at 0⁰ C is

(A) 332 ms^-1
(B) 332 cms^-1
(C) 222 ms^-1
(D) zero

• The expression for frequency ‘f’ of a mass attached to spring having spring constant K is

(A) f=2π                             

(B) f=   

(C) f=                             

(D) f=2π

• The formula for the speed of satellite orbiting around the earth is

(A)                                          
(B)  
(C)                                         
(D) V= V=  

• 100 radians are equal to

(A) 57.3⁰
(B) 573⁰
(C) 5730⁰
(D) 5.73⁰

• The slope of velocity time graph at any instant represents

(A) force
(B) acceleration
(C) instantaneous acceleration
(D) power

• An example of base quantity is

(A) area
(B) volume
(C) length
(D) velocity

• Blood pressure is measured by

(A) hydrometer
(B) barometer
(C) galvanometer
(D) sphygmomanometer

• In stationary waves, the velocity of particle at the node is

(A) maximum
(B) infinite
(C) zero
(D) variable

• Horizontal range is maximum when the angle of projection is

(A) 30⁰
(B) 45⁰
(C) 15⁰
(D) 0⁰

• Wavelength of a wave for closed pipe having length ‘ℓ’ in the fundamental mode is

(A) 2ℓ
(B) ℓ/2
(C) 4ℓ
(D) ℓ

• On reflection from denser medium light wave undergoes a phase change of

(A)π rad
(B) rad
(C) rad
(D)2 π rad

• The cross product of kˆ x jˆ is equal to

(A) iˆ
(B) jˆ
(C) kˆ
(D) -iˆ

• Angular acceleration is produced by

(A) power
(B) torque
(C) pressure
(D) force

• According to first law of thermodynamics the quantity which is conserved

(A) energy
(B) force
(C) momentum
(D) power

Inter (Part-I) Gujranwala Board 2014
Physics (New Scheme) Paper : I (Subjective)
Time: 3.10 Hours
Marks: 83

Note: Section I and II are compulsory. Attempt any three (3) questions from Section II.
(Section-I)

2. Write short answers to any EIGHT questions: (2x8=16)

• Find the dimensions and S.I. units of co-efficient of viscosity.
• Show that the expression V_f = V_i + at is dimensionally correct.
• Name several repetitive phenomenon occurring in nature which could serve as reasonable time standards.
• How many nanoseconds are there in one year?
• Define (a) unit vector (b) position vector
• Can you add zero to a null vector?
• Can a body rotate about its centre of gravity under the action of its weight?
• Prove that the area between the velocity-time graph and the time axis is numerically equal to the distance covered by the object.
• Show that time rate of change of momentum of a body equals the applied force.
• Write down two characteristics of a ballistic missile.
• Explain the circumstances in which the velocity ‘v’ and acceleration ‘a’ of a car are
  (a) parallel (b)perpendicular
• Explain the difference between laminar flow and turbulent flow.

3. Write short answers to any EIGHT questions: (2x8=16)

• When a rocket re-enters the atmosphere, its nose cone becomes very hot. Where does this heat energy come from?
• A girl drops a cup from a certain height which breaks into pieces. What energy changes are involved?
• Calculate the work done in kilo joules in lifting a mass of 10 kg (at a steady velocity) through a vertical height of 10 m.
• What is meant by Inertia? Explain its significance.
• How many minimum number of geo-stationary satellites are required for global coverage of T.V. transmission? Explain.
• Define articial gravity. Write down expression for its frequency.
• Can we realize an ideal simple pendulum?
• What is meant by phase angle? Does it define angle between maximum displacement and the driving force?
• What is harmonic oscillator?
• Is it possible for two identical waves travelling in the same direction along a string to give rise to a stationary wave?
• Why sound travels faster in warm air than in cold air? Explain.
• Define Doppler Effect.

4. Write short answers to any SIX questions: (2x6=12)

• Under what conditions two or more sources of light behave as coherent sources?
• An oil film spreading over a wet footpath shows colors. How does it happen? Explain.
• Write down two parts of Huygen’s Principle.
• What do you mean by linear magnification and angular magnification?
• Why would it be advantageous to use blue light with compound microscope?
• Why is the average velocity of molecules in a gas zero but the average of the square of velocities is not zero?
• Specific heat of a gas at constant pressure is greater than specific heat at constant volume. Why?
• Is it possible to construct a heat engine that will not expel heat into the atmosphere?
• State first law of thermodynamics and give its mathematical form.

(Section-II)

5.(a) Describe elastic collision in one dimension. Show that Relative velocities before collisions = Relative velocities after collisions. (5)

(b) Find the angle between the two vectors:
A= 5 i + j and B = 2i + 4j 3

6.(a) Define absolute potential energy. Derive its mathematical expression. 1,4

(b) The earth rotates on its axis once a day. Suppose, by some process the earth contracts so that its radius is only half as large at present. How fast will it be rotating then? (3)
(For sphere I = 2/5 MR²)

7.(a) What is simple pendulum? Show that motion of simple pendulum is simple harmonic motion. Also derive the relation for its time period. 1,4

(b) A church organ consists of pipes each open at one end of different lengths. The minimum length is 30 mm and the longest is 4 m. Calculate the frequency range of the fundamental notes. ( speed of sound = 340 ms^-1) (3)

8.(a) What is compound microscope? Calculate its magnifying power.

(b) A light is incident normally on a grating which has 2500 lines per centimeter. Compute the wavelength of a spectral line for which the deviation in second order is 15.0⁰. (3)

9. (a) Define pressure of a gas. Derive its expression 1/3 p< v2 >, according to kinetic theory.

(b) An airplane wing is designed so that the speed of the air across the top of the wing is 450 ms^-1, the speed of air below the wing is 410 ms^-1, What is the pressure difference between the top and bottom of the wings? Density of air = 1.29 kgm^-3  (3)

(Section-III)
(Practical)

10.(a) Write answers to any four parts: 4x2=8

• What is vernier constant?
• What is meant by the pitch of a screw?
• What is meant by least count?
• What is simple pendulum?
• Define center of gravity.
• Define refractive index.
• Define total internal reflection.
• What is parallax?

(b) Write down the brief procedure to find experimentally the refractive index of the material of a prism by critical angle method. (3)

OR

Write down the brief procedure to find experimentally the unknown weight of body by the method of vector addition of forces.

(c) Answer the following questions on the basis of graph below: (4)

(i) What is the relation between F and x.

(ii) Find the value of the spring constant.

OR

(i) What do you infer from the graph?

(ii) Find the frequency when = 0.04 cm^-1