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NET 3 2014

Posted by: Unknown Posted date: 19:30 / comment : 0

NET 3 2014

1.When distance btwn source and screen is made 0.25 times what will be the separation btwn dark fringes?

 2.Pick the odd one out..
D)tortoise
b)whale
c)snake
d)lizard
3.pick odd one out:
a. toluene
b. phenol
c. benzene
d. nitro benzene
4.The angle of the vector -4 under root 3 i +4 j with + ive y axis is
A.30
B.45
C.60
D.15
5.The acid amides can be prepared by the reaction of NH3 with;

A.ethers
B.acid anhydride
C.acid halide
D.all
6.The value of azimuthal quantum no. (l) is from

A.0 to -n
B.0 to +n
C.0 to n-l
D.0 to n+l
7.If an e jumps from 5 orbital of hydrogen atom to 6 orbital then the change in its energy is

A.30%
B.44%
C.50%
D.none
8.SI unit of electric field is;

a) N/C
b) V/m
c) both a and b
d) none of above
9.Can matter alter the space??
a)Yes
b)No
c)May be yes or not
d)None
10.If you are on the moon than gravity is acting towards;

a) Milky ways
b) Earth
c) Planets
d) Sun
11.Pascal is the unit of;

a) Pressure
b) F/A
c) both a and b
d) none
13.Product of force and time is called;

a) Momentum
b) Torque
c) Impulse
d) none
14.Which compounds are more viscous;

a) Saturated
b) Unsaturated
c) both
d) none

15.: Sajid starting from his house, goes 4 km in the East, then he turns to his right and goes 3 km. What minimum distance will be covered by him to come back to his house?

a) 4 km
b) 3 km
c) 5 km
d) 2 km
16.Asif starting from his house, goes 5 km in the East, then he turns to his left and goes 4 km. Finally he turns to his left and goes 5 km. Now how far is he from his house and in what direction?

a) 2 km east
b) 4 km north
c) 4 km north east
d) none of above
17.Which of the following is the smallest prime number;

a)1
B)2
C)3
D)0
18.3^x + 3^y = 3^x+y then dy/dx is 

A) 3^x-y 
B)3^y-x 
C)-3^x-y
D)-3^y-x

19.Energy is stored in an inductor in the form of;

a) Magnetic energy
b) Potential Energy
c) Electrical energy
d) none
20.Output voltage of transformer is 3 times the input voltage then turns ratio will be;

a) 1:1
b) 1:3
c) 3:1
d) none
21.Snonym of Nightmare;

a) ordeal
b) terror
c) daymare
d) certainty
22.Which of these are obtained from fungal cultures?

A. Gibberlins
B. Absicisic acid
C. Ethene
D. None of these
23.Sunset makes sky appear reddish because of

(a) diffraction of sun rays
(b) refraction of light
(c) scattering of light from dust particles
(d) polarization of light
24.Cobalt-60 is a source of.

A. Alpha rays.
B. beta rays.
C.gamma rays.
D.none of these.
25.In de-broglie's equation electron behaves as

a) light rays
b) x rays
c) gamma rays
d) none
26.Body of fish is streamlined or______

a) Spindle
b) Sphere
c) Cylindrical
d) None
27.Body of fish is streamlined or______

a) Spindle
b) Sphere
c) Cylindrical
d) None
28.Order of reactivity of alcohols with halogens is 

A) primary > secondary > tertiary
B) secondary > tertiary > primary
C) tertiary > secondary > primary
D) none of these
29.Pick the odd one out 

a-plastic
b-wood
c-paper
d-wool

30.When the string attached to the body moving in a circle breaks then force acting on the string at that instant is;

A) 0
B) infinity
C) cannot be determined
D) None of above
31.If a,b € R then which will be greater;
a) a+b
b) a-b
c) a*b
d) insufficient data

32.By increasing frequency, resonance will

a) decrease
b) increase
c) remains same
d) none

33.Which material is suitable for making perfect magnet;

a) Soft iron
b) Iron
c) Steel
d) Copper

34.Domain of 3sin^2x

a) R
b) -3<x♥
c) [-3,3]
d) none
35.When a magnetic is heated it;

a) Weakens
b) Strengthens
c) demagnetized completely
d) none

36.Which of the following will experience maximum force in the magnetic field;

a) Proton
b) Electron
c) He^+
d) all experience same

37.Which force do maximum work ;

a) Centripetal force
b) tension in the string
c) conservative forces
d) none
38.What will be the effect on value of g if earth stops rotation;

a) Increases
b) Decreases
c) remains same
d) Insufficient data

39.Angle b/w rectangular co-ordinates of a vector 

a) 90
b) 180
c) They are mutually perpendicular
d) none

40.Light waves is ...
a)transverse wave 
b)longitudinal wave
c)Electromagnetic waves
d)both b and c

41)which of the following is best conductor?
a)silver
b)Al
c)Gold
d)Cu





CHAPTER 18 ELECTRONICS

Posted by: Unknown Posted date: 09:35 / comment : 0 ,


CHAPTER 18 

ELECTRONICS


1. When a PN-junction is formed, then
(a) there is an immediate recombination of holes with electrons
(b) there is an immediate diffusion of charge carriers across the
junction
(c) more and more charge carriers are produced
(d) none of these

 2. Depletion voltage
(a) is more for germanium
(b) increases in the forward bias
(c) decreases with reverse bias
(d) is more for silicon

 3. Reverse biasing of a PN-junction is obtained by
connecting
(a) P-side of the junction with positive terminal of the battery
(b) N-side of the junction with negative terminal of the battery
(c) N-side of the junction with positive terminal of the battery
(d) both P and N sides of the junction with ground.

 4. Avalanche breakdown
(a) refers to forward bias region
(b) refers to reverse bias region
(c) takes place in heavily doped junctions
(d) none of these

 5. Depletion region carries
(a) positive charges
(b) negative charges
(c) no charge
(d) all of these

 6. Potential barrier in a diode
(a) helps moving holes from P-type to N-type
(b) helps moving electrons from N-type to P-type
(c) stops the mutual movement of both hole and electrons
(d) none of the above

 7. The graph which shows the relation of biased voltage
versus current through a P-N junction is called
(a) diode current graph
(b) diode voltage graph
(c) diode graph
(d) current biased voltage graph

 8. If a reverse current of a reverse biased junction is
increased to a maximum value then
(a) voltage drops to zero
(b) diode becomes more efficient
(c) diode junction may break down
(d) none

 9. Process of conversion of AC into DC is called
(a) rectification
(b) amplification
(c) purification
(d) magnification

 10. Conversion of only one half of AC into DC is called
(a) half wave amplification
(b) full wave amplification
(c) half wave rectification
(d) full wave rectification

 11. Identify which instrument can be used for rectification
(a) Transistor
(b) Diode (or p-n junction)
(c) Inductor
(d) Transformer

 12. In a half wave rectifier, the diode conducts for
(a) the full input cycle
(b) a portion of the positive half of the input cycle
(c) a portion of the negative half of the input cycle
(d) one half of the input cycle
13. In full-wave rectification by bridge the number of diodes
required are
(a) only one
(b) two only
(c) four
(d) infinite

 14. LED's work on the basis of
(a) emission of energy in the form of photons
(b) Faraday's law
(c) ionic bonding between P-type & N-type substance
(d) none
15. The central region of a N-P-N transistor is called
(a) collector
(b) base
(c) emitter
(d) barrier
16. The ratio of collector current IC to the base current IB is
always constant for a given transistor. This ratio  is
called
(a) resultant current of a transistor
(b) multiple current of a transistor
(c) current gain of a transistor
(d) none

 17. For a normal biased transistor, the emitter current IE can
be given by
(a) IE = IC
(b) IE = IB
(c) IE = IC + IB
 (d) none of these

 18. Conversion of small AC voltage into large AC voltage is
(a) rectification
(b) magnification
(c) amplification
(d) all of the above
19. In a PN junction the arrow points towards
(a) P side
(b) N side
(c) depletion region
(d) the direction of electron flow

 20. In the forward region of its characteristics, a junction
diode appears as
(a) an OFF switch
(b) an ON switch
(c) a high resistance
(d) good conductor

 21. In a P-N junction, the diffusion current is
(a) from N side to P side
(b) from P side to N side
(c) zero
(d) due to minority carriers

 22. In a P-N junction with no applied voltage
(a) there is a net charge transfer between the two sides
(b) there is a constant electric field near the junction
(c) there is no net charge transfer between the two sides
(d) none of these

 23. In the normal use of transistor,
(a) the emitter is forward biased
(b) the emitter is reversed biased
(c) the collector is forward biased
(d) the base is reverse biased

 25. In common base configuration, a transistor amplifier has
(a) a high input resistance
(b) a low input resistance
(b) a low output resistance
(d) none of these

 26. A common-base transistor amplifier is one in which
(a) emitter is grounded
(b) base is grounded
(c) collector is grounded
(d) output is obtained across the base.

 27. In a common-emitter amplifier, the phase difference
between output and input voltage is
(a) 0°
(b) 90°
(c) 180°
(d) none of these

 28. Beta is the current gain in
(a) common base amplifier
(b) common emitter amplifier
(c) common collector amplifier
(d) oscillator

 29. Two terminals of op-amp are respectively called
(a) negative input (–) and positive input (+)
(b) negative input (–) and positive output (+)
(c) negative output(–) and positive input (+)
(d) inverting input (–) and non-inverting input(+)

 31. Truth table of a logic gate
(a) summarizes its output values
(b) tabulates all its input conditions
(c) display all its input / output possibilities
(d) is based on number algebra

 32. An AND gate
(a) performs logic addition
(b) performs logic multiplication
(c) has output true if one of its input is true
(d) none of these

 33. A two-input OR gate
(a) has an output O if either of its input is1
(b) has output 1 if both its inputs are 0
(c) performs logic multiplication
(d) has output 1 if either of its inputs is 1.
34. A NAND gate
(a) is an AND gate with inverted inputs
(b) is an AND gate with inverted outputs
(c) gives output 1 for both its inputs at 1
(d) gives output O for both its inputs at O

 35. A NOR gate
(a) has an output 1 if both its inputs are 1
(b) has an output 1 if both its inputs are 0
(c) is an OR gate with inverted inputs
(d) is a combination of AND and OR gates

 36. A NOT gate
(a) has two inputs
(b) has two outputs
(c) has one input
(d) has one input and one output

 37. In a 2-input logic gate, both inputs are 0. If output is 1,
gate could be
(a) on OR only
(b) a NOR only
(c) a NAND only
(d) a NOR, NAND or XNOR

 38. Which of the following gates are universal?
(a) OR
(b) AND
(c) NOT
(d) NAND and NOR

 39. Any logical expression can be realized using only
(a) AND gate
(b) NAND gate
(c) AND, OR and NOT gate
(d) NOT gate

 40. An AND gate can be prepared by repetitive use of
(a) OR gate
(b) NOR gate
(c) NAND gate
(d) Both NOR and NAND gates

MERIT LIST 2013(NUST)

Posted by: Unknown Posted date: 08:00 / comment : 0 ,


MERIT LIST 2013(NUST)






NUST IMPORTANT CHAPTERS

Posted by: Unknown Posted date: 13:08 / comment : 0 ,


NUST IMPORTANT CHAPTERS

"AS PEOPLE WANT IMPORTANT CHAPTERS" 

Important Chapters of Mathematics :
Part-1 : 4,6,7,8,12
Part-2 : 1,3,4,6

Important Chapters of Physics :
Part-1 : 2,3,5,7,9,10
Part-2 : 12,13,14,15,16,21

Important Chapters for Biology :
Chap : 2,4,8,11,12,13,14,15,16,17,18,20,21,22,25
All chapters related to HUMAN SYSTEM ..

Important Chapters For Chemistry :
Part-1 : 3,4,5,6,8,11
Part-2 : 3,4,6,7,8,9,10,11,12,13,14

GOOD LUCK:-

Chapter 02 Groups

Posted by: Unknown Posted date: 11:46 / comment : 0 ,

    Chapter 02                 Groups


1)  The set N of natural numbers is closed with respect to

A)     Addition
B)      Multiplication
C)      Both A & B
D)      Subtraction
Answer:                 C

2) The set Z of integers is closed with respect to

A)     Addition
B)      Multiplication
C)      Subtraction
D)      A, B and C are correct
Answer:                 D

3) The set R – {0} of real numbers is closed with respect to

A)     Addition
B)      Multiplication
C)      Division
D)       A,B & C are correct
Answer:                 D

4) In the set S = {0, 1} the binary operation defined is

A)     –
B)      +
C)      ´
D)      ¸
Answer:                 C

5)The set S = {- 1, 1, - i, i} is a group with respect to the binary operation

A)     ¸
B)      ´
C)      +
D)      –
Answer:                 B
6)The set S = {1, w, w2} is a group with respect to the binary operation

A)     ´
B)      ¸
C)      +
D)      –
Answer:                 A

7) If set is a group with respect to addition then the number of identity elements in S is

A)     Unique
B)      Two
C)      Three
D)      None
Answer:                 A

8) If set S is a group with respect to addition then each element of S has _____ inverse.

A)     Unique
B)      Two
C)      Three
D)      None
Answer:                 A

9)R – {0} is a group w.r.t the binary operation

A)     +
B)      ´
C)      ¸
D)      –
Answer:                 B

10)Q – {0} is a group w.r.t the binary operation

A)     +
B)      ´
C)      ¸
D)      –
Answer:                 B

11) R is a group w.r.t the binary operation.
A)     +
B)      ´
C)      ¸
D)      –
Answer:                 A

12)Q is a group w.r.t the binary operation.
A)     +
B)      ´
C)      ¸
D)      –
Answer:                 A

13) S = {1, - 1} is a group w.r.t the binary operation.
A)     +
B)      ´
C)      -
D)      none of these
Answer:                 B
14)S = {0} is a trivial group under

A)     +
B)      ´
C)      ¸
D)      –
Answer:                 A

15) S = {1} is trivial group under

A)     +
B)      ´
C)      –
D)      division
Answer:                 B

16) A non empty set S which is closed with a binary operation ‘*’ is called group if

A)     The binary operation is associative
B)      There exists identity element with respect to the binary operation.
C)      There exist a unique inverse of each element of S with respect to the binary operation.
D)      All A, B & C hold.
Answer:                 D
 17)In a proposition  if   p→ q then q  → p is called
               
A)      inverse of  p→ q
B)       converse of  p→ q
C)       contrapasitive  p→ q
D)      none
Ans: B

18)Truth table containing all false values is called
A)  Tautology
B) Selfcontridiction
C) Equivallent
D) None
Ans: B

19)Truth table containing all true values is called
A)  Tautology
B) Selfcontridiction
C) Equivallent
D) None
Ans: A
 20) In a proposition if p→ q then contrapasitive of this proposition is denoted by
  
   
A)           q  → p
B)            ~ q  → p
C)            ~ q  →  ~ p
D)            None

Ans: C


 21) In a proposition if p→ q then inverse of this proposition is denoted by 

A)           q  → p
B)            ~ q  → p
C)            ~ p  →  ~ q
D)            None
Ans : C
 22) In a proposition if p→ q then converse of this proposition is denoted by
   
A)           q  → p
B)            ~ q  → p
C)            ~ q  →  ~ p
D)            None
Ans: A


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