Lahore Board 2014
Inter Part-I
Group-I
Time:20 Min.
Objective Type
Marks=17
Note: Four Possible answers A, B, C and D to each question are the given. The choice which you think is correct, fill that circle in front of that question with marker or pen ink in the answer-book cutting or filling two or more circles will result in zero mark in that question.

• The stationary waves consist of:

(A) Crest and troughs
(B) Compressions and elongations
(C) Nodes and antinodes
(D) Reflection and rarefactions

• When one mirror of a Michelson interferometer is moved a distance of 0.5 mm, 2000 fringes are observed. The wave length of light used is:

(A) 5000m
(B) 5000A⁰
(C) 500cm
(D) 2000 A⁰

• The area between velocity-time graph and the time axis is numerical equal to:

(A) Speed of subject
(B) Distance covered by the object
(C) Average velocity of the object
(D) Acceleration of the object

• The optical fiber is covered for protection by a:

(A) Glass jacket
(B) Plastic jacket
(C) Copper jacket
(D) Aluminum jacket

• International Telecommunication satellite organization operates at microwave frequencies of:

(A) 4,6,8 and 10 Hz
(B) 4,6,11 and 14 GHz
(C) 4,6,8 and 12 Hz
(D) 4,8,11 and 16 GHz

• Which is the process in which temperature of the system remains constant :

(A) Isobaric process
(B) Isochoric process
(C) Isothermal process
(D) Adiabatic process

• When a body is whirled in a horizontal circle by means of a string, the centripetal force is supplied by :

(A) Mass of a body
(B) velocity of a body
(C) Tension in the string
(D) centripetal acceleration

• If the resultant of two vectors each of magnitude F is also of Magnitude F, the angel between them will be :

(A) 30⁰
(B) 60⁰
(C) 90⁰
(D) 120⁰

• A set of frequencies which are multiples of the fundamental frequncey are called :

(A) Doppler effect
(B) Nodal frequencies
(C) Beat frequencies
(D) Harmonies

• The pitch of sound depends upon :

(A) Intensity of sound
(B) Loudness of sound
(C) Wavelength of sound
(D) Frequency of sound 

• The lower reading of blood pressure is called :

(A) Systolic pressure
(B) Diastolic pressure
(C) Normal pressure
(D) Non-normal pressure

• When the projectile reaches the highest point of trajectory the vertical comments of a velocity becomes:

(A) Small
(B) Maximum
(C) Vicos
(D) zero

• If a car moves with a uniform speed of 2m/ sec. in a circle of radius 0.4 m its angular speed is :

(A) 4rad/ec
(B) 5 rad/sec
(C) 1.6rad/sec
(D) 2.8 rad/sec

• The value of solar constant is :

(A) 1.4kwn^-2
(B) 1.0kwm^-2
(C) 4.1 kwm^-2
(D) .1 kwm ^-2

• The frequency Of waves produced in microwave oven is :

(A) 1435Hz
(B) 2450MHz
(C) 1860MHz
(D) 2850 Hz

• A system does 600 j of work and at the same time has its internal energy increased by 320 j. How much heat has been supplied :

(A) 280 j
(B) 920 j
(C) 600 j
(D) 200 j

• A light year is the distance, light travels in one year. How many meters are there in one light year :

(A) 9.5x10^-15m
(B) 9.5x10¹⁵m
(C) 9.5x10¹⁵cm
(D) 9.5x10¹⁵km

Inter (Part-I) Lahore Board 2014
Physics Paper I (Essay Type)
Time Allowed: 3.10 hours Max.Marks:83
(Group-I)
(SECTION-I)

2. Write short answers to any EIGHT (8) questions: 16

• Write the dimensions of : (a) Pressure, (b) Density.
• How many nanoseconds are in one years?
• Name several repetitive phenomenon occurring in nature which could serve as reasonable time standard.
• What do you mean by scientific notation, give an example?
• Define the terms: (a) Unit vector (b) Position vector
• Can a magnitude of a vector have negative value?
• Why do you keep your legs far apart when you have to stand in the aisle of bumpy riding bus?
• What is difference between uniform and variable velocity? Give S.I units of velocity and acceleration.
• Can the velocity of an object reserve the direction when acceleration is constant?
• Define impulse and show that how it is related to linear momentum.
• Why is it useful to use a safety helmet?
• Explain what do you understand by the term viscosity and give its S.I unit.

3. Write short answers to any EIGHT (8) questions: 16

• Define escape velocity. Write its value.
• 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.
• State law of conservation of energy.
• Explain the difference between tangential velocity and angular velocity.
• Explain how many minimum number of geo-stationary satellites are required for global coverage of T.V. transmission.
• Why does a diver change his body position before and after diving in the pool?
• Under what condition does the addition of two simple harmonic motions produce a resultant, which is also simple harmonic?
• Does frequency depend on amplitude for harmonic oscillators?
• What is meat by phase angle? Does it define angle between maximum displacement and the diving force?
• How are beats useful in tuning musical instruments?
• Explain why sound travels faster in warm air than in cold air.
• How should a sound source move with respect to an observe so that the frequency of its sound does not change?

4. Write short answers to any SIX (6) questions: 12

• Under what condition two or more source of light behave as coherent sources?
• What is Huygen’s Principle?
• Why the polariod sunglasses are better than ordinary sunglasses?
• What is simple microscope? Write down the equation for its magnifying power.
• Why would it be advantageous to use blue light with a compound microscope?
• Derive Charles’ law from kinetic theory of gases.
• Why does the pressure of a gas in a car tyre increase when it is driven through some distance?
• Specific heat of a gas at constant pressure is greater than specific heat at constant volume. Why?
• Give an example of natural process that involves an increase in entropy.

(SECTION-II)

Attempt any THREE questions.

5. (a) Define scalar product, write down its any four characteristics. (5)

(b) Two blocks of masse 2.0 kg and 0.50 kg are attached at the two ends of a compressed spring. The elastic potential energy stored in the spring is 10 J. Find the velocities of the blocks if the spring delivers its energy to the blocks when released. (3)

6. (a) Show that work done in gravitational field is independent of path followed. (5)

(b) A body of moment of inertia (I=0.80 Kgm² ) about a fixed axis rotates with constant angular velocity of 100 rad s^{-1 .} Calculate its angular momentum ‘L’ and torque to sustain this motion. (3)

7. (a) Define and explain interference of sound waves. What are its kinds & conditions? (5)

(b) A block of mass 4.0 kg is dropped from a height of 0.80 m onto a spring of spring constant K=1960 Nm^-1. Find the maximum distance through which the spring will be compressed. (3)

8. (a) Explain diffraction of X-rays by crystals. (3)

(b) A telescope is made of an objective of focal length 20 cm and an eye piece of 5.0 cm, both convex lenses. Find the angular magnification. (5)

9. (a) State and derive Bernoulli’s equation for ideal fluid. (5)

(b) A heat engine performs 100 J of work and at the same time rejects 400 J of heat energy to cold reservoir. What is the efficiency of the engine? (3)

(SECTION-III)
(Practical Part)

A . Attempt any four questions.

• For a cylinder if radius=1.73 cm and length ℓ= 4.31 cm. find The volume of the cylinder.
• What is zero error? When it is positive, when it is negative, for a screw gauge?
• While using simple pendulum, why the amplitude be kept small?
• What is meant by elastic limit?
• What is an optically denser medium?
• How does the refractive index of refracting medium changer with the wavelength of light?
• What is law of tension?
• What is the role of water in the resonance tube?

B . Write down the procedure of the experiment, show that time period is independent of the amplitude. 3

OR

Find the refractive index of the material of a prism by critical angle method.

C .

• Find the acceleration due to gravity from graph.
• Find time of fall for height 70 cm. (image)
  From graph find focal length.
  Find P when q=25 cm.

Lahore Board 2014
Inter Part-I
Group-II
Time:20 Min.
Objective Type
Marks=17
Note: Four Possible answers A, B, C and D to each question are the given. The choice which you think is correct, fill that circle in front of that question with marker or pen ink in the answer-book cutting or filling two or more circles will result in zero mark in that question.

• If he string is fixed at both ends vibrates in “n” loops, then wave-length ‘l’ of string, is given by :

(A) nl/2
(B) l/2n
(C) 2l/n
(D) 2l/v

• The process of confining the beam of light to vibrate in one plane is called:

(A) Interference
(B) Diffraction
(C) Polarization
(D) Total internal reflection

• A bullet shot straight up returns to its starting point in 10 sec. its initial speed was :

(A) 9.8ms^-1
(B) 24.5ms^-1
(C) 49ms^-1
(D) 98ms ^-1

• If magnifying power of magnifying glass I s3, then focal length will be:

(A) 25cm
(B) 12.5cm
(C) 5cm
(D) 3cm

• Weight of a 60 kg man in moving elevator(downward) with constant acceleration of 1\2g (g=10ms^-2):

(A) Zero
(B) 300 N
(C) 600 N
(D) 200 N

• The kinetic theory of gases suggests the average kinetic energy per molecule is :

(A) (1/2) KT
(B) KT
(C) (3/2) KT
(D) 2KT

• The ratio of orbital to escape velocity is:

(A) √2
(B) 1/√2
(C) 1/2
(D) 2

• Resultant of two perpendicular vectors of equal magnitude (say, A) will be:

(A) A
(B) 2A
(C) √2 A
(D) A²

• In order to produced beats, the two sound waves should have :

(A) The same amplitude
(B) Slightly
(C) The same frequency
(D) Slightly different frequency

• When wave is reflected from the boundary of denser medium then phase of wave changes by :

(A) 0⁰
(B) 90⁰
(C) 180⁰
(D) 270⁰

• The law of conservation of energy is the basis of :

(A) stream line flow
(B) Equation of continuity
(C)Bernoulli’s equation
(D) Venture relation

• When a ball is thrown straight up, the acceleration at its highest point is:

(A) Upward
(B) Downward
(C) Zero
(D) Horizontal

• One radian is equal to:

(A) 2 rev
(B) /4 rev
(C) /2 rev
(D) 1/2 rev

• A body of mass 1.0 kg drops from the top of a tower of height 50 m, what will be its K.E., 10m below the top:

(A) 490j
(B) 49 j
(C) 98 j
(D) 980 j

• when one mirror of a Michelson interferometer is moved a distance of 0.5 mm, 2000 fringes are observed . The wave length of light used is :

(A) 5000m
(B) 5000A⁰
(C) 500cm
(D) 200A⁰

• The optical fiber is covered for protection by a :

(A) Glass jacket
(B) Plastic jacket
(C) Copper jacket
(D) Aluminum jacket

• For total assessment of uncertainty in the final result obtained by multiplication and division :

(A) Absolute uncertainties are added
(B) Fractional uncertainties are added
(C) % age uncertainties are added
(D) Error are added

Inter (Part-I) Lahore Board 2014
Physics Paper I (Essay Type)
Time Allowed: 3.10 hours Max.Marks:83
(Group-II)

(SECTION-I)

2. Write short answers to any EIGHT (8) questions: 16

• Define Physics, Nuclear Physics.
• How many second are there in 1 year?
• Write the dimensions of: (a) Pressure (b) Density
• Give the drawback to use the period of a pendulum as a time standard.
• Define null Vectors, Equal Vectors.
• Can you add zero to a null vector?
• Is it possible to add a vector quantity to a scalar quantity? Explain.
• State Newton’s Second and Third Law of Motion.
• Explain the circumstances in which the velocity v and acceleration a of a car are: (a) Parallel. (b) Anti-parallel.
• At what point or points in its path does a projectile have its minimum speed, its maximum speed?
• Show that the range of projectile is maximum when projectile is thrown at an angle of 45̊ with the horizontal.
• Why fog droplets appear to be suspended in air?

3. Write short answers to any EIGHT (8) questions: 16

• A girl drops a cup from 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 through a vertical height of 10m.
• Define the term power and its S.I. unit.
• When mud flies off the tyre of a moving bicycle, in what direction does it fly?
• What is meant by angular momentum?
• What is Geo-Stationary Satellites?
• Can we realize an ideal simple pendulum?
• What happen to the period of simple pendulum if its length is doubled? What happens if its mass is doubled?
• Describe some common phenomenon in which resonance plays an important role.
• What features do longitudinal waves have in common with transverse waves?
• Why does sound travel faster in solids than in gases?
• Describe briefly about nodes and antinodes.

4. Write short answers to any SIX (6) questions: 12

• Could you obtain Newton’s rings with transmitted light? If yes, would you the pattern be different from that obtained with reflected light?
• How would you distinguish between plane-polarized light and unpolarized light?
• Define: (a) A ray of light, (b) Wave front,
• Write down the names of the essential components of a spectrometer.
• Explain the difference between angular magnification and resolving power of an optical instrument.
• Sketch the ray diagram of a compound microscope.
• Derive the Charles’law from kinetic theory of gasses.
• Is it possible to convert internal energy into mechanical energy? Explain with an example.
• Does entropy of a system increase or decrease due to friction?

(SECTION-II)

Attempt any THREE questions.

5. (a) Define elastic and inelastic collision. Explain elastic collision in one dimension to show the relative velocities before and after collision are same. (5)

(b) Show that the three vectors î + ĵ + k̂ , 2î - 3ĵ+k̂ and 4 î+ ĵ-5 k̂ are mutually perpendicular. (3)

6. (a) What is a conservative field? Show that a gravitational field is conservative field. (5)

(b)  A gramophone record turn table accelerate from rest to an angular Velocity 45.0 rev min^-1 in 60 S. What is its average angular acceleration? (3)

7. (a) Define simple harmonic motion. Prove that projection of particle Moving in a circle along vertical diameter is a SHM. (5)

(b) The frequency of note emitted by a stretched string is 300 Hz. What will be the frequency of this note when the tension is increased by one-third without changing the length of the wire? (3)

8. (a) Define microscope. Derive relation for magnifying power of compound microscope. (5)

(b) Light is incident normally on a gratin which has 2500 lines per Centimeter. Compute wavelength of spectral line for which the Deviation in second order is 15̊. (3)

9. (a) Define terminal velocity, show that terminal velocity is directly proportional to the square of radius of the droplet. (5)

(b) Estimate proportional to the average speed of nitrogen molecules in air under standard condition of pressure and temperature. (3)

(SECTION-III)
(Practical Part)

A . Attempt any four questions. 8

• What is zero-error?
• What is meant by the pitch of a screw gauge?
• What is simple pendulum?
• State Hook’s law?
• What is moment arm?
• What type of vibrations are set up in the wire of sonometer ?
• What is end correction?
• What are conditions for total internal reflection?

B . Write a brief procedure of the experiment to measure diameter of a wire with a screw gauge and then calculate its area of cross-section. 3
OR
Write a brief procedure of experiment to find refractive index of material of prism by critical angle method.

C . Answer the following questions on basis of graph:

• Find focal length of lens.
• For a value of I/P = 0.07 cm^-1 find value of I/q =?

(Image)s

OR

Answer the following questions relating to graph between “F” and “X”

• Calculate value of spring constant.
• What do you infer from the graph?

(Image)