Q1. The curie Temperature of Iron is
(A) 1000k
(B) 1000 C
(C) 273 K
(D) 0 k
Answer: 1000k
Explanation: In physics and materials science, the Curie temperature (TC), or Curie point, is the temperature at which certain materials lose their permanent magnetic properties, to be replaced by induced magnetism.
Q2. Type of Earthing used in power Generation station is
(A) stripe earthing
(B) plate earthing
(C) rod earthing
(D) pipe earthing
Answer: plate earthing
Explanation:
Q3. Candela is the unit of
(A) Luminous intensity
(B) Electric field intensity
(C) Sound intensity
(D) None
Answer: Luminous intensity
Explanation:
Q4. The unit of susceptibility is
(A) tesla
(B) H/m.
(C) J/m.
(D) dimensionless
Answer: H/m.
Explanation:
Q5. For vacuum susceptibility
(A) infinite
(B) unity
(C) zero
(D) none of these
Answer: zero
Explanation:
Q6. conductance is analogous to
(A) reluctance
(B) mmf
(C) permeance
(D) inductance
Answer: permeance
Explanation:
Q7. Unit of mmf is
(A) AT
(B) weber/ampere
(C) henry
(D) AT/m
Answer: AT
Explanation:
Q8. mmf of magnetic circuit is analogous to which electrical quantity
(A) current
(B) emf
(C) resistance
(D) power
Answer: emf
Explanation:
Q9. the velocity of sound will be least in
(A) steel
(B) copper
(C) aluminium
(D) distilled water
Answer: distilled water
Explanation:
Q10. The velocity of sound waves will be least while traveling through
(A) cork
(B) wood
(C) glass wool
(D) vacuum
Answer: vacuum
Explanation:
Q11. which of the following frequency may not be detected by human ear?
(A) 10HZ
(B) 100HZ
(C) 1000HZ
(D) 10000HZ
Answer: 10HZ
Explanation:
Q12. solar cell is an example of
(A) Photo voltaic cell
(B) Photo conductive cell
(C) Photo emissive cell
(D) Photo radiation cell
Answer: Photo voltaic cell
Explanation:
Q13. During interface of light
(A) energy is gained
(B) energy is redistributed
(C) part of energy is lost
(D) none of these
Answer: energy is redistributed
Explanation:
Q14. The refractive index for diamond is
(A) 1.1
(B) 1.55
(C) 1.95
(D) 2.45
Answer: 2.45
Explanation:
Q15. Refraction index will be least case of
(A) Barium flint glass
(B) Diamond
(C) Benzene
(D) Dry air
Answer: Dry air
Explanation:
Q16. beats are the result of
(A) diffraction of sound waves
(B) destructive interference of sound
(C) constructive and destrictive interference
(D) none of these
Answer: constructive and destrictive interference
Explanation: When two sound waves of different frequency approach your ear, the alternating constructive and destructive interference causes the sound to be alternatively soft and loud - a phenomenon which is called "beating" or producing beats. The beat frequency is equal to the absolute value of the difference in frequency of the two waves.
Q17. smallest wavelenth is of
(A) micro waves
(B) infrasonics
(C) audible frequencies
(D) ultrasonics
Answer: ultrasonics
Explanation: The term ultrasonic applied to sound refers to anything above the frequencies of audible sound, and nominally includes anything over 20,000 Hz. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz.
Q18. nicol prism is made from
(A) diamond
(B) flourspar
(C) calcite
(D) flint glass
Answer: calcite
Explanation: a device for producing plane-polarized light, consisting of two pieces of optically clear calcite or Iceland spar cemented together with Canada balsam in the shape of a prism.
Q19. ampere second is the unit of
(A) emf
(B) power
(C) electric charge
(D) energy
Answer: electric charge
Explanation:
Q20. which insulation is most widely used for covering wires or cables used in internal wiring
(A) paper
(B) wood
(C) glass
(D) pvc
Answer: pvc
Explanation:
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