1. The value of resistivity of the insulating material is _____ Ohm-Cm
(A) 10³–10⁶
(B) 10⁸–10²⁰
(C) 10²²–10³⁰
(D) 10³⁰–10⁴⁰
2. The dielectric constant of carbon dioxide is _____ kilovolt per millimetre
(A) 5
(B) 2.5–4.5
(C) 3–5
(D) 1.000985
3. Dielectric are used to store _____
(A) electric charge
(B) water
(C) air
(D) heat
4. Air is a _____
(A) non-conductor
(B) conductor
(C) semiconductor
(D) super conductor
5. Insulators are generally classified on the basis of their _____ state
(A) chemical
(B) biological
(C) liquid
(D) physical
6. Sulphur Hexafluoride is a _____ insulator
(A) solid
(B) gaseous
(C) liquid
(D) semi solid
7. Mica can be used safely upto _____ °C
(A) 600
(B) 400
(C) 500
(D) 300
8. _____ prohibit the passage of electric current
(A) insulator
(B) conductor
(C) semiconductor
(D) super conductor
9. Sulphur Hexafluoride is stable upto _____ °C
(A) 500
(B) 600
(C) 700
(D) 800
10. The dielectric constant of hydrogen gas is _____ kilovolt per millimetre
(A) 5
(B) 2.5–4.5
(C) 1.000985
(D) 3–5
11. Cotton, wool, silk and jute are the examples of
(A) fibrous insulators
(B) paper & cardboard
(C) wax
(D) varnish
12. _____ have very low electrical conductivity
(A) conductors
(B) super conductors
(C) insulators
(D) semiconductors
13. _____ is a gaseous insulator
(A) SF₆
(B) askarels
(C) mica
(D) resin
14. The dielectric constant of nitrogen gas is _____ kilovolt per millimetre
(A) 5
(B) 1.000985
(C) 3–5
(D) 2.5–4.5
15. Copal, shellac and amber are the examples of
(A) all three
(B) synthetic resins
(C) varnish
(D) natural resins
16. The dielectric constant of air is _____ kilovolt per millimetre
(A) 5
(B) 2.5–4.5
(C) 1.000985
(D) 3–5
17. The dielectric constant of rubber is _____ kilovolt per millimetre
(A) 2.3
(B) 3.0–3.3
(C) 2.58
(D) 2.5–5
18. Ceramics, mica, asbestos and glass are _____ insulating materials
(A) organic liquid
(B) organic solids
(C) inorganic liquid
(D) inorganic solids
19. The dielectric constant of PVC is _____ kilovolt per millimetre
(A) 2.3
(B) 2.58
(C) 3.0–3.3
(D) 2.5–5
20. The dielectric constant of mineral oil is _____ kilovolt per millimetre
(A) 40–60
(B) 30–50
(C) 50–70
(D) 60–80