Inter (Part-I) Dera Ghazi Khan Board 2014
Physics
Part I (Objective Type)
Time Allowed: 20 Minutes 
Max. Marks: 17

Note: Four possible answers A, B, C and D to each question are 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.

Question #1
Circle the correct option i.e. A/B/C/D. Each part carries one mark.

• Computer chips are made up of

(A) Silicon
(B) Germanium
(C) Iron
(D) Cadmium

• Name the quantity which is a vector

(A) Speed
(B) Force
(C) Temperature
(D) Density

• The slope of velocity time graph gives

(A) Speed
(B) Torque
(C) Acceleration
(D) Displacement

• S.I unit of linear momentums is                                         

(A) Kgm² S^-1
(B) Kgm² S^-2
(C) Kgm^-1 S^-1
(D) Kgm S^-1

• Work has same dimensions as that of

(A) Torque
(B)Power
(C) Momentum
(D) Force

• The motion of  a body moving along a circular path is called

(A) Translational motion
(B) Angular motion
(C) Linear motion
(D) Vibratory motion

• The S.I unit of angular displacement is

(A) Degree
(B) Revolution
(C) Radian
(D) Rotation

• A wheel of radius 50 Cm having an angular speed of 5 rad S1 have linear speed

(A) 1.5 mS^-1
(B) 3.5 mS^-1
(C) 4.5 mS^-1
(D) 2.5 mS^-1

• The systolic pressure of normal healthy person is

(A) 120 torr
(B) 130 torr
(C) 119 torr
(D) 110 tort

• In simple harmonic motion the velocity of a particle is maximum at

(A) Extreme position
(B) Mean position
(C) In between extreme and mean position
(D) None of them

• The portion of the wave above mean level is called

(A) Node
(B) Antipode
(C) Crest
(D) trough

• According to Newton's formula the speed of sound in air at STP is

(A) 332 mS^-1
(B) 340 mS^-1
(C) 350 mS^-1
(D) 280 mS^-1

• The value of ‘ γ ‘  for monatomic gas is

(A) 1.67
(B) 1.40
(C) 1.29
(D) 1.45

• An oil film on water surface shows colour due to

(A) Diffraction
(B) Interference
(C) Polarization
(D) Dispersion

• Magnifying power of telescope is

(A)
(B) fo + fe
(C)
(D) fo — fe

• For an ideal gas the internal energy in directly proportional to

(A) Pressure
(B) Volume
(C) Mass
(D) Temperature

• For an isothermal process 1st law of thermodynamics is

(A) Q = W
(B) Q = ∆u
(C) Q = - W
(D) Q = ∆u + ∆W

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

Section I

Q2 Write short answers any Eight (8) questions of the following                             16

• Name several repetitive phenomer on occurring in nature which could serve as reasonable time standards
• Why do we find it useful to have two units for the amount of substance, the kilogram and the mole?
• What is the difference between radian and ste-radian ?
• Does a dimensional analysis give any information on constant of proportionality that may appear in an algebraic expression? Explain
• Name the three different conditions that could make A1 x A2 = 0
• Can a body rotate about its centre of gravity under the action of its weight?
• Can you add zero to null vector?
• Define impulse and show that how it is related to linear momentum
• At what point or points in its, path foes a projectile have its minimum speed , its maximum speed?
• Can the velocity of an object reverse the direction when acceleration is constant ? If so , give an example
• State the Law of Conservation of linear momentum (12) Write the three characteristics of an ideal fluid

Q3 Write short answers any Eight (8) questions of the following                               16

• Show that P= F.V
• What sort of energy is in the following (a) compressed spring (b) A moving car
• A boy uses a catapult to throw a stone which accidentally smashes a green house window. List the possible energy changes
• On what factors, moment of inertia depends?
• When mud flies off the tyre of a moving bicycle, in what direction does it fly? Explain
• Calculate the critical velocity of s define orbiting near Earth Surface (R = 6.4 x 106 m)
• Does frequency depends on amplitude of harmonic oscillator?
• If mass spring system is hung vertically and set into oscillations, why does the motion eventually stops?
• What do you understand by force vibrations. Explain with examples
• What is the effect of variation of pressure on the speed of sound in gas?
• Why does sound travel faster in solids than in gases?
• A wave is produced along a stretched string but some of its particles permanently show zero  displacement. What type of wave is it?

QUESTION NO. 4 Write short answers ac y Six (6) questions of the following                               12

• An oil film spreading over a wet footpath shows colours. Explain how does it happen?
• How would you manage to get more orders of spectra using a diffraction grating?
• What is optical rotation?
• Why would it be advantageous to use blue light with a compound microscope?
• If a person was looking through a telescope at the full moon, How would appearance the                 moon be changed by covering half of the objective lens?
• 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 then specific heat at constant volume. Why?
• A Thermos flask containing milk as a system is shaken rapidly. Does the temperature of milk rise?
• Prove that W = P ∆ V

SECTION -II

Note: Attempt ant three question from this section

Question #5
(a)      Define vector product. Write down its four characteristics
A x B -
(b)      A foot ball is thrown upward with an angle of 30° with respect to horizontal. To throw a 40 m pass what must be initial speed of ball?

Question #6
(a)     Discuss the interconversion of P.E and K.E with out and with friction.
(b)     The Earth rotates on its axis once a day. Suppose by some process the Earth contacts so that its radius is only half as large as at present. How fast will it be rotating them.

Question #7
(a)     Define simple Pendulum, Derive the expression for time period.
(b)     Find the temperature at which the velocity of sound in air is two times at 10 °C.

Question #8
(a)     How wavelength of monochromatic lights is measured with the help of Michelson's interferometer.
(b)      Calculate the critical angle and angle of entry for an optical fibre having core of refractive index 1.50 and cladding of refractive index 1.48.

Question #9
(a)      State first law' of thermodynamics and explain (i) isothermal process (6) adiabatic process.
(b)     What gauge pressure is required in the city mains for a stream from a fire hose connected to the mains to reach a vertical height of I5.Cm?     

                                                         SECTION —111                (PRACTICAL)

Question #10
(A) Give answer to any Four questions  4x2 = 8

• What is Vernier constant?
• What is the use of screw gauge?
• How does the value of 'g' vary with altitude?
• What is the Second's Pendulum?
• What is meant by 'g' ?
• Why is Sonometer so called?
• What is that which vibrates in the resonance tube?
• What is Parallax?

10. (B) Write down the brief procedure w find the value of g' By Free Fall method using an electronic timers
                                                         OR
              Write down the brief procedure to verify the Law of Length of Stretched string by using a Sonometer

(C) Answer the following questions on the basis of graph drawn below
(i) Find the slope from the graph            (ii) Determine the Length of Pendulum corresponding to 1.95 sec 2+2
Image
OR
(C) Answer the following questions on the basis of graph drawn below
(i) What does this graph indicate                     (ii) Find the slope of the graph