Q1. The relative permeability of ferromagnetic material is
(A) 1
(B) less than 1
(C) more than 1000
(D) None of these

Q2. A clearly separate echo of a sound is heard when the minimum distance of the reflecting surface from the source of sound is
(A) 34m
(B) 17m
(C) 100m
(D) 10m

Q3. output of laser beam is
(A) infrared
(B) polarised
(C) narrow beam
(D) coherent

Q4. Admittance is reciprocal of
(A) Susceptance
(B) Impedance
(C) Reactance
(D) Conductance

Q5. SI unit of electric current
(A) Coulomb
(B) Joule
(C) Ampere
(D) None

Q6. the strength of a semi conductor crystal comes from?
(A) forces between nuclei
(B) forces between protons
(C) electron pair bonds
(D) none of the above

Q7. which one of the following not a unit of length ?
(A) light year
(B) parsec
(C) shake
(D) meter

Q8. which one of the following a unit less quantity?
(A) angle
(B) refractive index
(C) angular displacent
(D) gas constant

Q9. forbidden gap for Si
(A) 1.5 ev
(B) 1.1 ev
(C) 0.7 ev
(D) 0.3 ev

Q10. The minimum distance between the source and the reflector for hearing a distance echo is
(A) 13
(B) 18
(C) 17
(D) 16

Q11. when material become a superconductivity its resistance become what is the value?
(A) 0
(B) 1
(C) 0.2
(D) 1.5

Q12. ML-1 T-2 IS DIMENSIONAL FORMULA OF
(A) MODULUS OF ELASTICITY
(B) MODULUS OF ENERGY
(C) MODULUS OF CURRENT
(D) NONE OF ABOVE

Q13. Piezo is a greek word for
(A) Force
(B) velocity
(C) Momentum
(D) Pressure

Q14. Unit work is
(A) henry
(B) joule
(C) watt
(D) volt-metre

Q15. Unit of capacitance is
(A) farad
(B) Henry
(C) watt
(D) mho

Q16. what is the unit of resistance ?
(A) ohm
(B) mho
(C) Kelvin
(D) rho

Q17. An oscillator that is most stable having simple circuit is
(A) Crystal
(B) Armstrong
(C) Clapp
(D) Colpitts

Q18. which of the following piezoelectric material can be used for very high frequencies
(A) Tourmaline
(B) Rochelle salt
(C) Quartz
(D) All of these

Q19. Which of the following substance shows least permeability
(A) Nickel
(B) Iron
(C) Gold
(D) Aluminium

Q20. Permanent magnets are used in
(A) Motor
(B) Transformer
(C) Moving coil instruments
(D) Buzzers

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