1.                  An element /compound with a definite volume and shape is called a

a.  Symmetric substance           b. Liquid                      c. Solid                         d. Gas 

2.                  A solid having regular arrangement of molecules throughout its structure is called

a.  Super solid               b. crystalline solid                    c. Perfect solid             d. Plasma

3.                  A solid having irregular arrangement of molecules is called

a.  Polymeric                 b. amorphous solid                  c. Ideal solid                d. none

4.                  Identify the polymer substance among the following

a.  Glass                        b. Iron                                      c. Plastic                      d. All of these 

5.                  A crystal lattice is

a.  random arrangement of atoms in a crystal    

b.  An order arrangement of points in space at which the atom, ions or molecule are positioned

c.  A random arrangement of molecules but orderly arrangements of atoms

d.  A piece of crystal

6.                  When the temperature of a semiconductor is increased, its electrical conductor is increased, its electrical              conductivity

a.  Increases                   b. Remains the same  c. Decreases     d. First increases than decreases

7.                  A semiconductor device is connected in a series circuit with a battery and a resistance. A current is found to pass  through  the circuit the polarity of the battery is reversed, the current drops almost to zero. The device may be 

a.  a  p-type semi conductor                  b. an n-type Semi conductor

            c. a Pn junction                                    d. An intrinsic semi conductor

8.                  Identify the crystalline solids among the following

a.  Graphite                    b. Diamond  d. All of these

9.                  Definite geometry in a crystalline solid repeats itself along

a.  one dimension                                 b. Along two dimensions

           c. Along three dimensions                    d. All of the above

10.              Crystal lattice is a 

a.  3-D arrangement of particles at their position          b. 2 D arrangement of particles

           c. 1-Darrangement of particles                                      d. All of the above

11.              The smallest part of a crystal lattice is called

a.  An ion          b. A molecule              c. an Atom                   d. a unit cell

12.              Polymers may consist of

a.  Carbon                                                                     b. Combination of C + O₂

           c. Combination of C, 0₂, H₂, N₂, Cu, F_e etc                   d.  None of these

13.              Crystal structure of NaCl

a.  Trigonal                   b. Cubical                    c. hexagonal                d. Monoclinic

14.              The atoms in a solid are held together by 

a.  Adhesive force        b. Cohesive force         c. Solid force              d. resistive force

15.              An external deforming force applied on a crystal may changes its 

a.  Shape only               b. Length only              c. Volume only           d. All of the above

16.              The characteristics of crystals can be studied by the use of

a.  X-rays                      b. Sound waves           c. Infra-red rays           d. all of these

17.              The ability of anybody to return to its original shape is called

a.  Elasticity                  b. Elastic force             c. Stress                       d. Strain

18.              The SI unit of stress is

a.  N/m²                        b. Nm              c. dynes/m                   d. N

19.              The measure of deformation in a certain solid due to the-action of stress is called

a.  Hook’s Law              b. mechanical advantage         c. Stress           d. Strain

20.              The S1 unit of strain is

a.  N                              b. Dynes                                  c. Pascal           d. Dimensionless

21.              A solid subjected to deformation along one dimension 

a.  Only have tensile stress                                             b. Only have compressive stress

          c. Have both tensile and compressive stress                 d. None of the above

22.              A stress which increases the length along one dimension only is called

a.  Compressive stress                                        b. Only have compressive stress

          c. Have both tensi1e and compressive stress    d. None of the above

23.              Stress can be classified into 

a.  Linear and compressive stress           b. Linear and shear stress

           c. Linear compressive and shear stress  d. All of the above

24.              Doping of a semi conductor (with small traces-of impurity atoms) generally changes the resistivity as follows 

a.  increases       b. Does not alter         c. Increases       d. May increases or decreases depending on the dopant

25.              On increasing the reverse bias to a large value in a Pn junction diode, the current

a.  Increases slowly       b. Remains fixed                     c. 1ncreases suddenly  d. Decreases slowly

26.              The strain is the ratio of 

a.  stress / strain             b. strain / stress           c. Force / Area             d. Change in length/ Original length

27.              The depletion layer in the PN junction region is caused by 

a.  drift of holes            b. diffusion of carries             c. migration of impurity  d. drifts of electrons

28.              The ratio of stress / strain is called as

a.  Modulus of elasticity           b. Young's modulus     c. Bulk modulus          d. Shear Modulus

29.              The ratio of tensile Stress to tensile strain

a.  Force                        b. Young's modulus                 c. Bulk Modulus          d. Shear Modulus

30.              In insulators 

a.  the valence band is partially filled with electrons     b. the conductance band is partially filled with electrons

c.  The conductance band is filled with electrons ad the valence band is empty

d. the construction band is empty and the valence band is filled with electrons 31. Which of the following is not a properly of a crystalline solid?

            a. Sharp melting point                           b. Flat surfaces             

           c. Isotropic electric conductivity           d. Long range order.

32.              What makes a solid possess a definite shape?

a.  Negligibly small thermal motion       b. long range order

           c. Higher Kinetic energy of molecules                         d. None of the above

33.              The ratio of volumetric stress to volumetric strain is called

a.  Young' modules       b. Bulk modulus           c. Shear modulus

34.              The SI unit of stress is same as that of 

a.  Momentum  b. Pressure  c. Force                 d. Length

35.              Crystals are classified into 

a.  3 groups                    b. 4 groups c. 7 groups                       d. infinite

36.              Seven system I groups were classified by

a.  Hook’s Law             b.  August Braves        c. Young's        d. Bragg's

37.              The greatest stress that a material can bear without any permanent change in its shape or dimension is called permanent 

a.  Super stress              b. Infinite stress           c. Stress            d. Proportional limit

38.              Point out ductile substance among the following

a.  Wrought Iron            b. Copper                     c. Lead             d. All of these

39.              A solid with intermediate crystalline order is called

a.  Plasma          b. Polymeric solid        c. amorphous solid       d. All of the above

40.              The characteristics of crystals can be studied by the use of 

a.  X-rays                      b. Sound waves            c. Infrared rays            d. All of above

41.              If the electron is hydrogen atom jumps from the third orbit the second orbit, the emitted radiation has wavelength

                (R is    Rydberg's constant)

a.  36/5R                       b. 5R/36           c. 6/5R             d. 5R/6

42.              Nylon breaks when the stress within it reaches 1x10⁹ Pa. Which range includes the heavies load that could be lifted by a  nylon thread of diameter1mm? 

a.  2N to 20N                b. 20N to 200N                        c.200N to 2000N         d. 2000N to 20000N

1.                  Depletion regions has

a.    Electrons only         b. holes only    c. Neither Electrons nor Holes             d. Both Electrons and Holes

2.                  For rectification we use

a.    Diode          b. Transformer                         c. capacitor                  d. none of these

3.                  Reverse biasing the CB junction of a transistor

a.   Reverse -biases the EB junction      b. Forward biases the EB junction c. Is necessary for it to amplify           d. Is not necessary for it to amplify

4.                  Specially designed semi conductor diodes used as indicator lamps in electronic circuits are

a.    Photodiodes             b. Solar cells                c. LED             d. Photovoltaic cell

5.                  Which one of the following is correct for a common emitter (CE) amplifier?

a.    Its current gain is high       b. It has very high voltage gain    c. It produces high power gain  d. All of them

6.                  Since the input resistance of an ideal OP-amplifier is infinite

a.    its output resistance is zero   b. It becomes a current controlled device c. its input current is zero  

7.                  An open loop OP-amplifier has output voltage V_o and difference between non inverting input voltage Vi its open loop gain is given by 

a.    A_OL =V_o/Vi               b. A_OL=V_i/V     x Vi                 d. none of the two

8.                  The closed loop gain of an OP-amplifier is G = -R      .the negative sign shows that output signal is out of phase w.r.t. input signal by 

a.    45⁰                           b. 90⁰                           c.  180⁰                                                d. 270⁰

9.                  Linear integrated circuits (LICs) find their applications in 

a.    operational amplifiers                      b. voltage comparators             c. comparator      d. all of them

10.              The emitter-base junction of a transistor is usually

a.    forward biased        b. reverse biased          c. non-conduction         d. working in the break-down region

11.              The output of 2-input Or gates is 0 only when its 

a.    both inputs are 0      b. either input is 1        c. both inputs are 1       d. either input is 0

12.              An XOR gate produces an output only when its two inputs are

a.    high             b. low              c. different       d. same

13.              Equivalent logic circuit of XOR gate can be designed by the combination of

a.    AND, OR and NOT gates                 b. NAND, NOR and NOR gates

               c. NOT, AND, and NOR gates             d. NOT, AND and NOR gates

14.              Equivalent logic circuit of XNOR gate can be designed by the combination of

               a.AND, OR , and NOT gate                             b. AND, NOR, and NOT gate

              c. NAND, AND, and NOR gate                        d. NAND, AND and NOR gates

15.              Donor impurities are

a.    Germanium, Silicon etc        b. Indium, Gallium etc            c. Antimony, arsenic etc.         d. Sodium, Zinc etc.

16.              In full wave rectification, the output DC voltage across the load is obtained for

a.    The positive half cycle of input AC only                b. The negative half cycle of input AC only

             c. The completes cycle of input AC only                      d. All of the above

17.              Demodulation 

a.    Is performed at the transmitting station        b. Removes side bands

              c. Rectifies modulated signal                           d. Is opposite to of modulation

18.              In amplitude modulation

a.    Carrier frequency is changed           b. Carrier amplitude is changed

              c. Three sides bands are produced         d. Fidelity is improved 

19.              100% modulation is produced in AM when carrier,

a.    Frequency equals signal frequency             b. Frequency exceed signal frequency

c. Amplitude equals signals amplitude  d. Amplitude exceed signals amplitude 20. A non conducting semiconductor diode is

               a. Forward biased                     b. Poorly biased           c. Reverse biased         d. None

21.              Special algebra used in digital system is called

a.                   De-Morgan Algebra  b. Bernoulli's Algebra  c. Boolean's Algebra       d. All of the above

22.              Photovoltaic cell is device that converts 

a.                   Light energy into electrical energy                   b. Chemical energy into electrical energy

              c. Light energy into sound energy                    d. None of these

23.          Identify which one is might be the most important building block of Circuit any complex; electric circuit 

a.                   diode  b. Resistor                    c. Thermistor                           d. Amplifier

24.              The barrier potential across the p-n junction is created by

a.                   majority carriers  b. minority carries c. fixed rows of oppositely charged ions   d. depletion layer 25. The barrier potential of silicon diode at room temperature is .

               a. 0.3 V                                          b. 0.7 Vc. 1 V                                                        d. 2mV

a.       increases under forward bias         b. is independent of applied voltage26.              The width of depletion region of a junction

              c. increases under revere bias                           d. None of them

27.              A non-conduction semiconductor diode is

a.       forward biased       b. poorly biased                       c. reverse biased                      d. None

28.              The characteristics of a transistor are

a.       Light dependents    b. Temperature dependant       c. Energy dependent                d. Sound dependant

29.              A photo diode is usually made from

a.       bismuth                   b. antimony                            c. Silicon                                  d. None

30.              A light emitting diode (LED) is made from

a.       gallium arsenide (GaAs)     b. gallium phosphide (GaP)  c. gallium arsenic phosphide (GaAsP)   d. all of them

31.              A light emitting diode (LED) emits light only when

a.       forward biased       b. reverse biased          c. unbiased      d. none of them

32.              A photo-diode can switch its current ON or OFF in

a.       milli-seconds           b. micro-seconds                    c. nano-second            d. centi-second

33.              The term transistor stands for

a.       transfer resistor      b. transfer of voltage              c. transfer of power     d. transfer of current

34.              The emitter of a transistor is generally doped the heaviest because it

a.       has to dissipate maximum power              b. has to supply the charge carries

              c. is the first region of the transistor                  d. must posses low resistance

35.              For proper working of transistors in normal circuit

a.       emitter-base junction is reverse biased and collector-base junction is forward biased

b.      emitter-base junction is forward biased and collector-base junction is reverse biased

c.       emitter-base junction is forward biased and collector-base junction is forward biased d. none of them

36.              Transistor is an electronic device that has

a.       two terminals         b.  Three terminals                    c. four terminals         d. None of them

37.              For common-emitter configuration of n-p-n transistor, the current gain   is given by

a.       IC / IB                     b. IB / Ic                                                 c. IE / IB            d. IE/ IB

38.              The transistor is basically a

a.       Voltage amplifier               b. current amplifier                  c. Rectifier                   d.  None of these

39.              A diode can convert

a.       ac into dc but not dc into ac                       b. dc into ac but not ac into dc

              c. ac into dc & dc into ac                    d. neither ac into dc nor dc into ac

40.              In a transistor

a.       Length of emitter is greater than that of collector   b. Length of collector is greater is greater than that of emitter

             c. 80th collector and emitter have the same length d. Anyone of emitter or collector can have greater length

41.              In a transistor, the basic is

a.       An insulator                                               b. A conductor of higher resistance

              c. A conductors of lowers resistance                d. An extrinsic semiconductors.