Monday, January 27, 2020
07:53 PM (GMT +5) Share Thread: Facebook Twitter Google+
#1 Ayesha Mahmood Senior Member Join Date: Jan 2010 Location: DGKhan & Isb Posts: 323 Thanks: 376 Thanked 264 Times in 178 Posts   Physics Paper 2011    Last edited by Rixwan; Sunday, April 10, 2011 at 01:37 AM. Reason: Full Paper Updated
#2
 abrowaqas Junior Member Join Date: Jun 2006 Location: Hyderabad Pak Posts: 26 Thanks: 44 Thanked 13 Times in 10 Posts  physics 2011 objectives

corrections are appreciated.

Paper I.

1. The angular momentum of a particle under the influence of a central force is
a) Infinite b) Negative c) Zero d) CONSTANT

2. Transverse component of the central force acting on a particle to keep it moving along a path is
a) mv2r b)mv2/r c) ZERO d) constant

3. Law of Intertia can be defined in
a) Accelerated system b) NON ACCELERATED SYSTEM c) both a) & b) d)None of these

4. The K.E of the particle executing a uniform circular motion:
a) Increases b) decreases c) REMAINS SAME d)None of these

5. What type of force acts on a raindrop to reduce its speed?
a) Gravitational force b) FORCE OF FRICTION c) Electromagnetic force d) drag force

6. The branch of heat relating to the measurement of temperature of body is called
a) THERMOMETRY b) photometry c) ellipsometry d) calorimetry

7. Which type of ideal gas will have the largest value for Cp-Cv
a) Monoatomic b) diatomic c) polyatomic d) THE VALUE IS SAME FOR ALL

8. What would be the most likely value for Ct, the molar heat capacity at constant temperature
a) Zero b) zero<Ct< Cv c) Cv<Ct<Cp d) CT= INFINITE

9. For which of the following process the entropy changes zero?
a) Isobaric b) isothermal c) ADIABATIC d) isochoric

10. The zeroth law of thermodynamics helps to define the term
a) TEMPERATURE b) pressure c) volume d) density

11. The law of conservation of mass in fluid dynamics can be expressed as
a) Av= constant b) RHO AV= CONSTANT c) P+(1/2)rho V + rho gy = constant d)None of these

12. The SI Unit of Viscosity is
a) N-S/M2 b) Dynes-s/cm2 c) N-s/m dynes-s/cm

13. The equation of the continuity requires that the total mass within certain volume must remain constant:
a) If there are sources as well as sinks
B) IF THERE ARE NO SOURCES & SINKS
c) If there are sources only
d) If there are sinks only

14. If the length of the “L” and the total force acting on it is “F” then surface tension given is
a) F*L b)F.L C) F/L d) L/F

15. If the particle of liquid which pass through a certain point do not follow the same path, as that followed by the particles that passed the same point previously the liquid is said to have
a) Steady b) NON STEADY FLOW c) turbulent flow d)None of these

16. The potential energy of a simple harmonic oscillator is
a) –Kx b) –Kx2 c) 1/2 KX2 D) -1/2 KX2

17. Types of the mechanical weaves are
A) LONGITUDINAL AND SOUND WAVES
c) Longitudinal and transverse waves
d) Transverse & x-rays

18. The refracted ray bends towards the normal when it enters from
A) RARE TO DENSER MEDIUM
b) denser to rare medium
c) Air to vacuum
d) None of these

19. On a reflection from a fixed end, a transverse wave undergoes a phase change of___ degrees
a) 90 B) 180 c) 270 d) 360

20. Resolving power of a gratting can be written as:
a) LAMBA/DEL LAMDA b) del theta/del lamda c) del lamda/lamda d) del lamda/del theta

Paper II

1. Lorentz force is the sum of:
a) Gravitational and centripetal force
B) ELECTRIC AND MAGNETIC FORCE
c) Magnetic and nuclear force
d) Electrical and nuclear force

2. The areas under the hysteresis loop is proportional to
a) Magnetic energy density
b) Thermal energy per unit volume
C) ELECTRIC ENERGY PER UNIT VOLUME
d) Mechanical energy per unit volume

3. The frequency of A.C is measured using:
a) Multimeter b) avometer c) TACHOMETER d) speedometer

4. Del. E = rho/epsilon not is called
a) GAUSS’S LAW b) faraday’s law c) ampere’s law d) biot savart’s law

5. For computation of the rate at which the dipole radiates energy, the interaction of the normal component of __________ is done over sphere of radius R.

6. Semiconductor materials have _____ bonds.
a) Ionic b) COVALENT c) mutual d) metallic

7. The depletion region of a pn junction is formed:
a) During the manufacturing process
B) WHEN FORWARD BIAS IS APPLIED TO IT
c) Under reverse bias
d) When its temperature is reduced

8. The current amplification factor DC is given by:
A) IC/IE b) Ic/Ib c)Ib/Ie d) Ib/Ic

9. In amplitude modulation
a) Carrier frequency is changed
B) CARRIER AMPLITUDE IS CHANGED
c) Three sidebands are produced
d) Fidelity is improved

10. Demodulation
a) Is performed at the transmitting station
b) Removes side bands
c) Rectifies modulation signal
d) IS OPPOSITE OF MODULATION

11. Which of the following x-ray lines will have the largest frequency in a given element
a) K alpha b) K BETA c) L gamma d) it depends on the element

12. Which of these statements is a consequence of planck’s derivation of a radiation law?
a) Atomic oscillator can emit and absorb energy at discrete values only
b) ATOMIC OSCILLATOR CAN EMIT AND ABSORB ENERGY AT DISCRETE FREQUENCIES ONLY
c) Both A & B
d) None of these

13. The Zeeman effect without the spin of the electron is called_____ Zeeman effect
a) ANOMALOUS b) normal c) paschen d) None of these

14. Zero point energy of harmonic oscillator is
a) hw b) HW/2 c) zero d)hw2

15. According to pauli exclusion principle for two identical ferminions the total __ is antisymmetric
a) Matrix b) WAVE FUNCTION c) operator d) tensor

16. The decay rate of a radioactivity is measured in units of
a) CURIES b) roentgens c) rads d) rems

17. Why are the fission fragments usually radioactive?
a) They come originally from radioactive U235
b) They have a large neutron excess
c) THEY HAVE A LARGE BINDING ENERGY PER NUCLEON
d) They are moving at high speed

18. In a nuclear reactor, the function of the moderator is
a) To absorb neutrons
b) To keep the reactor from going critical
c) TO SLOW DOWN THE NEUTRONS
d) To absorb heat from the core

19. What is the main difficulty associated with the fusion process as a source of electrical power
a) The scarcity of fuel
b) THE COULOMB BARRIER
c) The radioactivity of the products
d) The danger of an explosion

20. Binding energy of a deuteron is
A) 2.22 MEV b) 2.8Mev c) 2.3Mev d)none of these

Last edited by Rixwan; Sunday, April 10, 2011 at 01:39 AM.
 The Following User Says Thank You to abrowaqas For This Useful Post: wajahatrafiq (Friday, November 02, 2012)
#3 very special 1 Senior Member Join Date: Dec 2010 Location: dream land,where eagles live Posts: 441 Thanks: 484 Thanked 286 Times in 195 Posts    Quote:
 Originally Posted by abrowaqas capital option is the answer. corrections are appreciated. Paper I. 1. The angular momentum of a particle under the influence of a central force is a) Infinite b) Negative c) Zero d) CONSTANT 2. Transverse component of the central force acting on a particle to keep it moving along a path is a) mv2r b)mv2/r c) ZERO d) constant 3. Law of Intertia can be defined in a) Accelerated system b) NON ACCELERATED SYSTEM c) both a) & b) d)None of these 4. The K.E of the particle executing a uniform circular motion: a) Increases b) decreases c) REMAINS SAME d)None of these 5. What type of force acts on a raindrop to reduce its speed? a) Gravitational force b) FORCE OF FRICTION c) Electromagnetic force d) drag force 6. The branch of heat relating to the measurement of temperature of body is called a) THERMOMETRY b) photometry c) ellipsometry d) calorimetry 7. Which type of ideal gas will have the largest value for Cp-Cv a) Monoatomic b) diatomic c) polyatomic d) THE VALUE IS SAME FOR ALL 8. What would be the most likely value for Ct, the molar heat capacity at constant temperature a) Zero b) zero
i think paper 2 no 7 ans is A..........because deplition region form when we combine P type and N type material and biasing is just the aplying voltage .......and biasing increase and decrease the already present deplition region
q No 19 ans also i think A...........
and in Q no 16 decay rate .............when rate is involved then time factor will come so i am also confuse in it
regards
 The Following User Says Thank You to very special 1 For This Useful Post: wajahatrafiq (Friday, November 02, 2012)
#4 Rashid Dilshad Junior Member Join Date: Aug 2013 Location: Karachi Posts: 25 Thanks: 1 Thanked 3 Times in 3 Posts  How to answer question 2 (a).
can anybody tell me what is constant vector and are the unit vectors constant in other cordinate systems?
#5
 DWZlpqnArvMsjMZGFosUVTSo Junior Member Join Date: Sep 2013 Location: Karachi Posts: 4 Thanks: 0 Thanked 0 Times in 0 Posts  Paper-I, Q-1 (v) is DRAG FORCE

 Thread Tools Search this Thread Show Printable Version Email this Page Search this Thread: Advanced Search Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules Similar Threads Thread Thread Starter Forum Replies Last Post dr.janxeb General Science Notes 24 Thursday, September 10, 2009 12:07 AM ahsanghalib General Knowledge, Quizzes, IQ Tests 0 Saturday, December 16, 2006 06:58 PM  