Past Paper Physics 1st Year BISE Lahore 2005

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Inter (Part-I) Lahore Board 2005 New SchemePhysics Paper: I

Time: 1.45 Hour Max. Marks: 29

(Objective Type)

Note: Use this paper to write the answer to the objective questions. No mark will be awarded for

cutting, over-writing or using a pencil. This paper must be tagged with the answer-book.

A. Some possible answers to each statement are given below. Tick mark the correct answer: 10

1. Supplementary units are:

(Two, Three, Fou, Five, One)2. If A = 2i + j + 2k,then |A| is:

(Zero , 3 , 5 ,9 , 4)

3. Inertia of body is measured in terms of:

(Its mass, Its weight, Force, Dyne, Erg)

4. One radian is equal to:

(67.3, 57.3, 87, 60,15)

5. The S.l. units of power is:

(Joule, Watt, Newton, Dyne, Erg)

6. The equation 6F uv is called:

(Newton's Law, Stokes law, Ohms law, Lenzs law, Faradays law)7. The time period of seconds pendulum is:

(4 seconds, 3 seconds,1 second, 2 seconds, 5 seconds)

8. The unit of intensity level is:

(Watt, Joule, Erg, Bel, Sabin)

9. Power of any lens would be one diopter when its focal length is:

(1.0 m, 1 cm, 10 cm, 2 m, 3 m)

10. Temperature of -273T on Kelvin Scale is:

(+273K,+373K ,-273K, OK)

B. Complete the following sentences: 10

a) Thee dimension of angular velocity is---------------

b) . cos , .A B AB then A B

= -----------------

c) The slope of velocity time graph is ----------------

d) The work done by centripetal force is ---------------- during half revolution.

e) The moment you switch on your mobile phone your position can be traced by ---------------

f) An incompressible and non-viscous fluid is called --------------- fluid.

g) A seconds pendulum completes 5 vibrations in --------------- seconds.

h) Stretched region of longitudinal wave is called ----------------

i) Light glare can be reduced by using ----------------

j) Unit of magnification is ------------------------


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C. Match the column A with column B and write correct answer in column C:5.4

Column A Column B Column CFemto Torricillis equation

Speed of flying bee in air T-1

Angular velocity 101

Moment of inertia 10-15

2

1 2

1

2P P V

5mS-1

Ventuei relation2

Mr

Polarization Fe + F0Length of telescope 1 + d / FeDisorder of system Transverse wave

Sound waves in air Entropy280mS

-1

Longitudinal waves

Inter (Part-I) Lahore Board 2005 New SchemePhysics Paper: I

Time: 1.45 Hour Max. Marks: 46

ESSAY TYPE

Note: All questions are attempted on the answer book.

SECTION-I

1. Write any EIGHT short answers of the following questions: 16

a) Name several repetitive phenomena occurring in nature which could serve as reasonable time

standard.

b) Under what circumstanced would a vector have components that are equal in magnitude?

c) Can an the velocity of an object reverse direction when acceleration is constant? If so, give

example.

d) 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.

e) When a rocket re-enters the atmosphere, its nose cone becomes very hot. Where does this heat

come from?f) Why mud flies off the tyre of a moving bicycle, in what direction does it fly? Explain.

g) A person is standing near a fast moving train, is there any danger that he will fall towards it.


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h) Under what conditions does the addition of two S.H.M produce a resultant which is also simple

harmonic?

i) How are beats useful in tuning musical instruments?

j) Why the polaroid sunglasses are better than ordinary sunglasses?

k) Why would it be advantageous to use blue light with a compound microscope?

l) A thermos flask containing milk as a system is shaken rapidly. Does the temperature of the milkrise?

SECTION-II

Note: Attempt any THREE questions.

2. (a) Define Isolated System. 1

(b) State and explain the law of conservation of linear momentum. 5

(c) A ball is thrown with a speed of 30m/scc in a direction 30 above the horizon. Determine

the height, time of flight and horizontal range. 4

3. (a) Define Artificial Gravity. 1

(b) Derive an expression for frequency by which space ship rotates so that astronauts feel

artificial gravity like earth inside the space, ship. Also calculate this frequency for a space ship

having outer radius equal to 9.8 m. 5

(c) Calculate Angular Momentum of a star of mass 2.3x1030

kg and radius 7.0 x I05

km if it

makes one complete rotation about its axis once in 20 days. 4

4. (a) Define fluid dynamics. 1

(b) Explain and derive Bernoulli's equation. 5(c) How large must a heating duct be if air moving 3.0 m/S along it can replenish the air in a

room of 300 m3

volume every 15 min.? Assume the airs density remains constant. 4

5. (a) What is the principle of superposition? 1

(b) State and explain the term beats. 5

(c) The frequency of the 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? 4

6. (a) What is the principle of fiber optics? I(b) Explain the construction and working of a compound microscope. Derive expression for

its magnification. 5

(c) The refractive index of the core and cladding of an optical fibre, are 1.6 and 1.4

respectively. Calculate the critical angle for the interface.

Past Paper Physics 1st Year BISE Lahore 2005

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