Past Paper Physics 1st Year BISE Lahore 2009

7/24/2019 Past Paper Physics 1st Year BISE Lahore 2009

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Inter (Part-1) Lahore Board 2009

Physics Paper: 1

Time: 20 Minutes Marks: 17

(Objective Type)

Note: Use this paper to write the answers 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.

Q1. Some possible answers to each statement are given below. Tick mark the correct answer: 17

1. Number of significant figures in 0.0173 are:

(a) 3 (b) 4 (c) 5 (d) 2

2. The dimensions of work are:

(a) [MLT-2

] (b) [ML2T

-2] (c) [ML

2T

-2] (d) None of these

3. When two vectors are anti-parallel, the angle between them is:

(a) Zero (b) 180 (c) 90 (d) 270

4. The magnitudes of cross-product and dot product of two vectors are equal, the angle between the

vectors is:

(a) Zero (b) 90 (c) 180 (d) 455. When velocity time graph is a straight line parallel to time axis, then:

(a) Acceleration is constant

(b) Acceleration is variable

(c) Velocity is zero

(d) Acceleration is zero

6. The area under the force-displacement graph represents:

(a) Work done (b) Power (c) Torque (d) None of these

7. One radian is equal to:

(a) 67.3 (b) 57.3 (c) 87.3 (d) 60

8. Centripetal force performs:

(a) Maximum work

(b) Minimum work

(c) Negative work

(d) No work

9. One torr is equal to:

(a) 1.333 Nm-2

(b) 1333.3 Nm-2

(c) 1333 Nm-2

(d) 13.33 Nm-2

10. The product of frequency and time period is:


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

11. A distance between two consecutive nodes is:

(a) /4 (b) /2 (c) (c) 2

12. The speed of sound in air at 0oC is 332 mS

-1. The speed at 2C will be:

(a) 333.2 mS-1

(b) 335 mS-1

(c) 330 mS-1

(d) None of these

13. The appearance of colors in thin films is due to:(a) Diffraction (b) Dispersion (c) Interference (d) Polarization)

14. Least distance of distinct vision:

(a) Increases with increase in age

(b) Decreases with increase in age

(c) Unchanged with increase in age

(d) None of these

15. Spectrometer is used to:

(a) Study diffraction of light

(b) Measure wavelength of light

(c) Measure refractive index of material

(d) All of these

16. Which is not example of adiabatic process:

(a) Rapid escape of air from burst tyre

(b) Rapid expansion of air

(c) Conversion of water into ice in refrigerator

(d) Cloud formation in the atmosphere

17. The efficiency of petrol engine is about:

(a) 25 - 30 % (a) 30 - 35 % (c) 35 - 40 % (d) None of these


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Inter (Part-1) Lahore Board 2009

Physics Paper: 1

Time: 2.40 Hours Marks: 68

(Essay Type)

Note: All questions are attempted on the answer book.

SECTION -1

Q2. Write any TWEENTY-TWO (22) short answers of the following questions: 44

1. Give the drawbacks to use the period of a pendulum as a time standard.

2. Write the dimensions of: (i) Pressure (ii) Density

3. Add the masses given in kg up to appropriate precision 2.180. 0.089, 11.8 and 5.32.

4. If one of the rectangular components of a vector is not zero, can its magnitude be zero? Explain.

5. Can we add zero to a null vector?

6. Can a body rotate about its center of gravity under the action of its weight?

7. Motion with constant velocity is a special case of motion with constant acceleration. Is thisstatement true? Discuss.

8. Define impulse and show that how it is related to linear momentum.

9. Explain the difference between elastic and inelastic collisions.

10. 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.

11. What is the SI unit of power? Define it

12. What sort of energy is stored in the following: (a) Compressed spring (b) A moving car

13. Explain what is meant by centripetal force and how it must be furnished to an object if it is to

follow a circular path.

14. Why docs a diver change his body positions before and after diving in the pool?

15. What does INTELSAT stand for?

16. Explain the difference between Laminar Flow and Turbulent Flow.

17. Explain, how a swing is produced in a fast moving cricket ball.

18. State Bernoulli's Equation.

19. Does the frequency depend on the amplitude for harmonic oscillator?

20. If a mass spring system is hung vertically and set into oscillations, why docs the motion

eventually stop?


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21. What is the frequency of a seconds pendulum?

22. What are conditions of constructive interference and destructive interference?

23. Write any two applications of Doppler's Effect.

24. As a result of distant explosion, an observer senses a ground tremor first, and then hears the

explosion. Explain the time difference.

25. Under what conditions two or more sources of light behave as coherent sources?26. How would you manage to get more orders of spectra using a diffraction grating?

27. Why the Polaroid sunglasses are better than ordinary sunglasses?

28. Define: (i) Linear Magnification (ii) Angular Magnification

29. What is spectrometer used for?

30. What is multimode step index fibre?

31. Give an example of a process in which no heat is transferred to or from the system but the

temperature of the system changes.

32. What happens to the temperature of the room, when an air-conditioner is left running on a table

in the middle of room?

33. Give an example of a natural process that involves an increase in entropy.

SECTIONII

Note: Attempt any THREE questions.

Q3. (a) Define vector product of vectors. Give at least two examples for each. Write down its

four characteristics. 5

(b) The magnitude of dot and cross products of two vectors are 6(3)1/2

and 6 respectively.

Find the angle between the vectors. 3

Q4. (a) Discuss interconversion of potential and kinetic energies in the presence of friction. 5

(b) A 70 kg man runs up a long stairs in 4 sec. The vertical height of stairs is 4.5 m.

Calculate his power.

3

Q5. (a) Derive relation for K.E., P.E. and T.E. of a mass m attached to a spring of constant k.

Show that T.E. is constant. 5(b) An 8.0 kg body executes SHM with amplitude 30 cm. Restoring force is 60 N when

displacement is 30 cm. Find period, acceleration and speed of body when displacement

is 12 cm. 3

Q6. (a) Explain the working of Michelsons Interferometer. 5

(b) In a double slit experiment, the second order maximum occurs at =0.25o. The

wavelength is 650 nm. Determine the slit separation. 3


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Q7. (a) Show that pressure exerted by the gas is directly proportional to the average translational

kinetic energy of gas molecules. 5

(b) A reversible engine works between two temperatures whose difference is 100oC. If it

absorbs 746 Joule of heat from source and rejects 546 Joule to sink, calculate the temperature

of source and sink.

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Past Paper Physics 1st Year BISE Lahore 2009