Inter (Part-I) Sahiwal Board 2014
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.

• For an ideal gas system, the internal energy is directly Proportional to:

(a) Pressure
(b) Volume
(c) Mass
(d) Temperature

• The latent heat of fusion of ice is:

(a) 3.36 x103Jkg^-1
(b) 3.36 x 10Vkg^-1
(c) 3.36x10.JKg^-1
(d) 3.36JKg^-1

• Which of the following will travel much faster than others, through the optical fibers.

(a) Ultra-violet light
(b) Visible light
(c) Invisible infra-red light
(d) White light

• Two light waves which are not coherent cannot produce,

(a) Interference
(b) Diffraction
(c) Polarization in some plane
(d) Return back

• In stationary wave, the particle velocity at the node, Is:

(s) Maximum
(b) Minimum
(c) zero
(d) Constant

• The number of nodes between two consecutive antinodes is

(a) Zero
(0) 3
(c) 2
(d) 1

• With the rise of temperature, the velocity of sound.

(a) Decreases
(b) Increases
(c) Remains constant
(d) Becomes double

• The dimensions of spring constant 'K' are:

(a)MT^-1
(b) MT^-2
(c) MLT^-2
(d) MT^-1

• Moment of inertia of ring or hoop is:

(a) mr²
(b) mr²
(c) mr²
(d) mr²

• The density of blood is nearly equal to that of:

(a) Water
(b) Milk
(c) Honey
(d) Oil

• The law of gravitation was introduced by:

(a) Huygen
(b) Boyle
(c) Newton
(d) Pascal

• The ant& subtended at the centre by circumference of circle is

(a) π/4 rad
(b) π/2 rad
(c) 2π rad
(d) 4π rad

• Solar energy at normal incidence outside the earth atmosphere is about.

(a) 1.4kwm^-2
(b) lkwm^-2
(c) 4.1kwm^-2
(d) 4kwm^-2

• Motion of a body along y-axis is:

(a) One dimensional
(b) Two dimensional
(c) Three dimensional
(d) Four dimensional

• The disc used by a women athlete has a mass of I kg, its weight in Newton is:

(a) 98N
(b) 100 N
(c) 80N
(d) 9.8 N

• In third quadrant direction of resultant vector is

(a) 180' - Φ
(b) 180 + Φ 
(c) 360 - Φ
(d) 360 + Φ 

• Which of the following measurements of length is most Precise?

(a) 5 cm
(b) 5.4 cm
(c) 5.41 cm
(d) 5.412 cm

Inter (Part-I) Sahiwal Board 2014
Physics
Part I (Subjective)
Time Allowed: 2.10 Hours 
Max. Marks: 83 

Section I

2. Attempt any EIGHT short questions. (8x2=16)

• Why do we find it useful to 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 errors are possible In the time period?
• Name several repetitive phenomenon securing in nature which could serve a reasonable time standards.
• Show that the famous "Einstein equation”  E = mc²   Is dimensionally consistent.
• Can the magnitude of a sector have a negative value?
• Is it possible to add a sector quantity to a scalar quantity:' Explain.
• Prove that A¯ . B¯ = A_X B_X +A_Y B_Y+A_Z B_Z.
• Can the velocity of an object reverse the direction when Acceleration is constant? If so, give an example.
• Differentiate between elastic and inelastic collisions.
• What is the difference between uniform and sellable velocity?
• Define momentum and write down its unit.
• Why fog droplets appear to be suspended in air?

2. Attempt any EIGHT short questions. (8x2=16)

• An object has 1 J of potential energy. Explain what does it mean?
• A girl drops a cup from a certain height, which breaks into pieces. What energy changes are involved?
• What is tidal energy?
• Explain what is meant by centripetal force and why it must by Furnished to an object if the object is to follow a circular path?
• When mud flies off the tyre of a moving bicycle, in what direction does it fly?
• Define angular displacement.
• Does frequency depend on amplitude for harmonic oscillators?
• What is meant by phase angle? Does it define angle between maximum displacement and the driving force?
• What are forced oscillations?
• What features do longitudinal waves have in common with transvers waves?
• Why does sound travel faster in solids than in gases?
• Explain the terms crest, trough, node and antinod

4. Attempt any SIX short questions. (6x2=12)

• Define wavefronts, also give its types?
• An oil film spreading over asset footpath shows colours. Explain how does it happen?
• How would you distinguish between un-polarized and plane-polarized lights?
• What are the problems, having a high magnifying power in Astronomical telescope?
• Explain how a convex lens is used as a magnifier?
• Derive the Charles' law on the basis of kinetic theory of gases?
• What are the defects in first law of Thermodynamics and how they can be remove in second law of Thermodynamics?
• A system undergoes from state P₁V₁ to P₂V₂. What will be the change in internal energy? ,
• Is it possible to convert internal energy into mechanical energy? Explain with an example.

SECTION-lll:

Attempt any THREE questions. (80=24)

Question #5.
(a)Define scalar product. Explain its four characteristics. (1+3+1)
(b) A foot ball is thrown upward with an angle of 3W with respect to the horizontal. To throw a 40m pass must be the initial speed of the ball? (3)

Question #6
(a) What is Geo stationary satellite. Derive relation for the radius of Geo stationary orbit. (4)
(b) How large a force is required to accelerate an electron? (m =9.1x10^-31 kg) from rest to a speed of 2.0 x 10⁷ ms^-1 through a distance of 5.0 cm. (4)

Question #7
(a) For a spring mass system, derive relations for P.E. and K.E. Also show that total energy remains constant. (5)
(b) Find the temperature at which the velocity of sound in air is two times its velocity at I0ºC. (3)

Question #8
(a)Define diffraction. Explain diffraction of light in a grating. (4)
(b) An astronomical telescope having magnifying power of 5 consist of two thin lenses 24 cm apart. Find the focal length of the lenses. (4)

Question #9
(a) State and prove Bernoulli's equation. (5)
(b) Estimeate the average speed of nitrogen molecules In air under standard conditions of pressure and temperature. (3)

SECTION-IV Attempt any four questions. (4x2=8)

Question #10(a)

• What Is ours correction?
• What Is the difference between mass end weight of a body?
• What is meant by clothe limit?
• What Is meant by moment of force?
• What are stationary waves?
• What Is resonance?
• What Is magnification?
• Define refractive Index.

(b) Write down brief procedure to determine experimentally the focal length of convex lens by displacement method.
OR
Write brief procedure to find the value of 'g' by electronic timer. (3) (c) Answer the following questions on the basis of graph "A" below (4)

• Find the reciprocal of 2.7 from the graph.
• What is the relation between N and

OR

b)
(i) Find the focal length of lens from the graph.
(ii) What is the relation between N and 1/N