Unit of impedance is?

A) Resistance
B) Ampere
C) Ohm
D) Henry
Answer: CWhich is more efficient to travel around obstacles?
A) AM
B) FM
C) both
D) None
Answer: BThe young’s modulus of water is (in Pascals)?
A) 0
B) 1
C) 2.2
D) None
Answer: AZirconia is
A) Crystalline
B) Amorphous
C) Polymeric
D) None
Answer: AThe curie temperature for iron is about?
A) 750°C
B) -110°C
C) 125K
D) 77K
Answer: AEnergy band theory is based on which theory?
A) Planck’s
B) Bohr model
C) Einstein’s
D) None
Answer: BThe ratio of potential barriers of Ge to Si at room temperature is:
A) 7 : 3
B) 1 : 3
C) 2 : 5
D) 3 : 7
Answer: CCurie temperature of iron is:
A) 750 K
B) 500 K
C) 100 K
D) 300 K
Answer: AWhich type of impurity is to be added to a pure semi-conductor crystal to
provide holes:
A) monovalent
B) trivalent
C) tetravalent
D) Pentavalent
Answer: BThe Young’s modulus of steel is?
A) 2 × 10¹¹ Nm²
B) 3.9 × 10¹⁰ Nm²
C) 2 × 10⁹ Nm²
D) 1.5 × 10¹⁰ Nm²
Answer: AWhich one is the Pentavalent impurity?
A) boron
B) gallium
C) antimony
D) Indium
Answer: CWhich one is not a ferromagnetic substance?
A) cobalt
B) copper
C) nickel
D) iron
Answer: BSI unit of current gain is?
A) ampere
B) volt
C) coulomb
D) No unit
Answer: DFor rectification we use:
A) transformer
B) diode
C) choke
D) Generator
Answer: BFind the gain of INVERTING AMPLIFIER of external resistance R₁ = 10KΩ, R₂
= 100KΩ:
A) 5
B) -10
C) -2
D) 50
Answer: BA PN-junction cannot be used as:
A) rectifier
B) amplifier
C) detector
D) LED
Answer: BTransistors are made from:
A) plastics
B) metals
C) insulators
D) semi-conductors
Answer: DA diode characteristics curve is plotted between___________ and current?
A) time
B) Reverse voltage
C) Forward voltage
D) Voltage
Answer: CThe open loop gain of the amplifier is order of:
A) 10⁴
B) 10⁵
C) 10⁶
D) 10⁸
Answer: BLED are made from semi-conductor?
A) Bohr
B) Chadwick
C) Dirac
D) Fermi
Answer: DSection 2: MCQs (119-135)The binding energy per nucleon for iron is?
A) 7.6 MeV
B) 8.8 MeV
C) 8.6 MeV
D) 7.0 MeV
Answer: BTypical source of β-particle is:
A) Radon
B) Strontium
C) Cobalt
D) None
Answer: BA pair of quark and anti-quark makes?
A) Photon
B) Proton
C) neutron
D) Meson
Answer: DExtremely penetrating particles are:
A) Alpha Particles
B) Beta Particles
C) Gamma Particles
D) Neutrons
Answer: CWhich one belongs to Lepton’s group?
A) Electron
B) muons
C) Neutrinos
D) ALL
Answer: DMass of meson is:
A) More than proton
B) Less than proton
C) Equal proton
D) Equal to neutron
Answer: BStrong nuclear force acts on:
A) Meson only
B) Pions only
C) Photons only
D) Hadrons only
Answer: DWhich one is used to study the circulation of blood?
A) Iodine-131
B) Sodium-24
C) Cobalt-60
D) Strontium-90
Answer: BTwo down and one up quarks make:
A) Proton
B) neutron
C) Photon
D) Positron
Answer: BA proton consists of quarks which are:
A) Two up, one down
B) One up, two down
C) ALL up
D) ALL down
Answer: AHiggs boson was discovered in:
A) July, 2002
B) July, 2010
C) July, 1912
D) July, 2012
Answer: DThe moderator used in nuclear reactor is:
A) sodium
B) Uranium
C) graphite
D) Cadmium
Answer: CSubatomic particles are classified into___________ groups:
A) 2
B) 3
C) 4
D) 5
Answer: BExchange particles of electro weak force are:
A) 2
B) 3
C) 4
D) 5
Answer: CCarriers of electromagnetic force are:
A) Photons
B) electrons
C) Gluons glue
D) graviton
Answer: AWhich of the following belongs to leptons:
A) Electrons
B) Muons
C) tau
D) All of these
Answer: DExchange particles of basic forces of nature are:
A) Higgs boson
B) Quarks
C) Gauge bosons
D) tau
Answer: CSection 3: MCQs (1-17)The photoconductor used in photocopier is:
A) Aluminum
B) Selenium
C) TONER
D) Copper
Answer: BElectric Flux is maximum when electric field intensity is at ________ to
the plane of the object?
A) 0°
B) 45°
C) 90°
D) 180°
Answer: CWhich field can be shielded?
A) Electric field
B) Gravity
C) Both
D) NONE
Answer: A1 eV =
A) 1.6 × 10⁻¹⁹ J
B) 6.67 × 10¹¹ J
C) 9.8 J
D) 6 × 10⁹ J
Answer: AThe value of coulomb’s constant depends upon:
A) Units
B) Medium
C) Both
D) NONE
Answer: BThe change of potential with respect to distance is equal to?
A) Electric Force
B) Electric Flux
C) Electric intensity
D) Current
Answer: CThe unit of electric intensity is?
A) V/m
B) N/C
C) J/s
D) Both a & b
Answer: DThe unit of capacitance is?
A) coulomb
B) volt
C) farad
D) ampere
Answer: CEnergy stored in a 2F capacitor having potential difference of 2V across
its plates is?
A) 2 J
B) 4 J
C) 8 J
D) 16 J
Answer: BDuring charging the capacitor, time constant defines the time required to
deposit________ times q₀?
A) 1
B) 0.63
C) 0.37
D) 0.100
Answer: BSilver and________ are the best conductors:
A) Copper
B) Platinum
C) Iron
D) Gold
Answer: AA single black color represents________ ohm of resistance:
A) 0
B) 1
C) infinite
D) Not defined
Answer: AIn gases, the charge carriers of electric current is/are?
A) electrons
B) ions
C) both
D) none
Answer: CKirchhoff’s First Rule is the law of conservation of?
A) Mass
B) Charge
C) Energy
D) Momentum
Answer: BThe value of the resistance depends upon________ of the conductor?
A) nature
B) dimensions
C) physical state
D) all
Answer: DThe material with negative temperature co-efficient are?
A) germanium
B) silicon
C) carbon
D) all
Answer: DThe tolerance for silver band is about?
A) 1%
B) 5%
C) 10%
D) none
Answer: CSection 4: MCQs (39-58)An AVO-meter is also called:
A) Electrons
B) Positron
C) Neutrons
D) Protons
Answer: DAn ammeter:
A) an ammeter
B) a voltmeter
C) a multimeter
D) an ohm-meter
Answer: CWhen a small resistance is connected parallel to the galvanometer, then
resulting is?
A) Voltmeter
B) Wheatstone bridge
C) Ammeter
D) Potentiometer
Answer: CIf the motor is overloaded, then the magnitude of back emf?
A) increases
B) Decreases
C) constant
D) Becomes zero
Answer: BLenz’s law and Kirchhoff’s 2nd law is in accordance with the law of
conversion of?
A) momentum
B) Charge
C) mass
D) Energy
Answer: DWhen the back emf in the circuit is zero, ________ current:
A) zero
B) maximum
C) minimum
D) Average
Answer: BWhich one of the following is not present in A.C. generator?
A) Slip rings
B) Commutator
C) armature
D) Magnet
Answer: BEnergy stored in an inductor is given by:
A) 1/2LI
B) I/2LI²
C) 1/2L
D) 1/2LI²
Answer: DAn ideal transformer does not change________ level?
A) voltage
B) current
C) frequency
D) POWER
Answer: CAn inductor may store energy in its________?
A) Magnetic field
B) Electric field
C) coil
D) None
Answer: AThe self-induction is given by:
A) NL = φI
B) NI = Lφ
C) Nφ = LI
D) N = LI
Answer: CCommutator was invented in:
A) 1736
B) 1834
C) 1935
D) 1885
Answer: BThe working principle of transformer is:
A) Self induction
B) Faraday’s law
C) Mutual induction
D) Lenz’s law
Answer: CAlternating current and voltage are in-phase in________?
A) resistor
B) capacitor
C) inductor
D) ALL
Answer: AThe phase angle at +ive (positive) peak is?
A) π/2
B) π
C) 3π/2
D) 2π
Answer: AThe sum of positive and negative peak values is called:
A) Average value
B) rms value
C) Peak value
D) p-p value
Answer: DThe power factor of RL-series circuit is:
A) 0
B) 1
C) Less than 1
D) More than 1
Answer: CIn Pakistan, the frequency of A.C. supply is:
A) 100 Hz
B) 50 Hz
C) 220 Hz
D) 60 Hz
Answer: BAt higher frequency of A.C. source?
A) Xₓ > Xₗ
B) Xₗ > Xₓ
C) Xₓ = Xₗ
D) NONE
Answer: BIn R-C series circuit current________ voltage?
A) Leads
B) Lags
C) In phase
D) ALL
Answer: ASection 5: MCQs (79-97)The thickness of base in a transistor is of the
order of:
A) silicon
B) Germanium
C) carbon
D) Gallium arsenide
Answer: DThe thickness of base is of the order of:
A) 10⁻⁴ m
B) 10⁻⁵ m
C) 10⁻⁶ m
D) 10⁻⁷ m
Answer: CWhich factor does not affect the conductivity of PN-junction diode?
A) doping
B) Temperature
C) voltage
D) pressure
Answer: DTime dilation is applicable to________ process?
A) physical
B) Biological
C) Chemical
D) ALL
Answer: DEarth is approximately a/an________ frame of reference?
A) inertial
B) non-inertial
C) NOT KNOWN
D) none
Answer: BIn NAVSTAR navigation system the location of a object can be predicted to
about________ m:
A) 2 m
B) 20 m
C) 50 m
D) 760 m
Answer: CPlatinum wire becomes white at________?
A) 900°C
B) 1100°C
C) 1300°C
D) 1600°C
Answer: DThe value of Wien’s constant is?
A) 5.67 × 10⁻⁸ m K
B) 2.9 × 10⁻³ m K
C) 6.63 × 10⁻³⁴ m K
D) 3 × 10⁸ m K
Answer: BThe value of Planck’s constant is?
A) 5.67 × 10⁻⁸ Js
B) 2.9 × 10⁻³ Js
C) 6.63 × 10⁻³⁴ Js
D) 3 × 10⁸ Js
Answer: CThe value of Stefan’s constant is?
A) 5.67 × 10⁻⁸ Wm⁻²K⁻⁴
B) 2.9 × 10⁻³ Wm⁻²K⁻⁴
C) 6.63 × 10⁻³⁴ Wm⁻²K⁻⁴
D) 3 × 10⁸ Wm⁻²K⁻⁴
Answer: AWhich photon has maximum energy quanta?
A) X-rays
B) Radio waves
C) Gamma rays
D) Microwaves
Answer: CEinstein was awarded Nobel prize in________?
A) 1900
B) 1921
C) 1924
D) 1927
Answer: BPotassium cathode in photocell emits electrons for a:
A) Visible
B) Infra-red
C) Ultra violet
D) X-rays
Answer: AIn Compton scattering, the Compton shift ∆λ will be equal to Compton
wavelength, if θ° is?
A) Zero
B) 45°
C) 60°
D) 90°
Answer: DMaximum kinetic energy of photoelectrons depends upon________ of incident
light:
A) frequency
B) Intensity
C) brightness
D) Power
Answer: AA positron is an antiparticle of?
A) Proton
B) electron
C) neutron
D) Photon
Answer: BThe momentum of the moving photon is:
A) zero
B) P = h/λ
C) P = λ/h
D) P = h/λ
Answer: BThe factor m₀c² of Compton’s equation has the dimension of:
A) Pressure
B) Length
C) Mass
D) Momentum
Answer: DWhich light photon has the least momentum:
A) Red
B) Blue
C) yellow
D) Green
Answer: ANumber of electrons emitted in photoelectric effect depends upon________
of incident light?
A) Intensity
B) frequency
C) energy
D) Wavelength
Answer: ASection 6: MCQs (98-118)The rest mass of an electron is?
A) 9.1 × 10⁻³¹ kg
B) 5.1 MeV
C) 0.51 MeV
D) 0.051 MeV
Answer: CX-rays can be:
A) reflected
B) diffracted
C) polarized
D) ALL
Answer: DX-rays will show the phenomenon ________ effect?
A) photoelectric
B) Compton
C) Pair production
D) none
Answer: BFor holography we use a beam of:
A) γ-rays
B) X-rays
C) β-rays
D) LASER
Answer: DWhich of the following series of H-Spectrum lies in ultraviolet region:
A) Lyman
B) Balmer
C) Paschen
D) Bracket
Answer: AProduction of X-rays can be regarded as the inverse of:
A) Compton effect
B) Pair production
C) Matter Annihilation
D) Photoelectric effect
Answer: DAtomic spectra are the examples of ________ spectra:
A) Continuous
B) Line
C) band
D) Mix
Answer: BA particle having 2e charge falls through a potential of 5V. Energy
acquired by it is________?
A) 2.5 eV
B) 20 eV
C) 0.4 eV
D) 10 eV
Answer: DThe radius of atom is of the order of?
A) 10⁻⁸ m
B) 10⁻¹⁰ m
C) 10⁻¹² m
D) 10⁻¹⁴ m
Answer: BLife time of the meta stable state is:
A) 10⁻³ s
B) 10⁻⁵ s
C) 10⁻⁸ s
D) 10⁻² s
Answer: CEnergy of the 4th orbit in hydrogen atom is:
A) -2.51 eV
B) -3.50 eV
C) -13.6 eV
D) -0.85 eV
Answer: DBalmer series lies in ________ region:
A) Ultraviolet
B) Visible
C) Infra red
D) ALL
Answer: BThe total energy of electron in the state n = ∞ of hydrogen atom is:
A) Zero
B) 3.2 eV
C) 10.2 eV
D) 13.6 eV
Answer: AWhen a nucleus emits an alpha particle its atomic mass decreases by:
A) 1
B) 2
C) 3
D) 4
Answer: DThe number of protons in any atom are always equal to the number of:
A) Neutrons
B) Electrons
C) Positrons
D) Mesons
Answer: Bα-particle carries a charge:
A) -e
B) +2e
C) -2e
D) No charge
Answer: BThe number of isotopes of cesium are:
A) 4
B) 32
C) 36
D) 22
Answer: CWhich particle has larger range in air:
A) α-particle
B) β-particle
C) γ-particle
D) Neutron
Answer: CThe charge on β-particle is:
A) +e
B) -e
C) +2e
D) NONE
Answer: BWhich of the following have no charge?
A) α-particle
B) β-particle
C) γ-particle
D) NONE
Answer: CNeutron was discovered in 1932 by:
A) 118-Neutron
B) 1932
C) γ-particle
D) NONE
Answer: B