What type of lenses are used in movie projectors?
(a) Convex
(b) Concave
(c) Zoom lens
(d) Meniscus lens
Answer:
Electron Volt (eV) is a unit of
(a) Charge
(b) Current
(c) Energy
(d) Potential
Answer:
The resistance of material increases with temperature. It is a
(a) Semiconductor
(b) Metal
(c) Insulator
(d) None of these
Answer:
Carriers of electric current in superconductors are
(a) Holes
(b) Phonons
(c) Electron
(d) Photons
Answer:
Good resistance coils are made of
(a) Gold
(b) Silver
(c) Copper
(d) Manganin
Answer:
Magnetic effect of current was discovered by
(a) Joule
(b) Kirchhoff
(c) Faraday
(d) Oersted
Answer:
The wire having a red plastic covering is a
(a) Earth wire
(b) Line wire
(c) Neutral wire
(d) None of these
Answer:
The mass of a neutron is nearly same as that of
(a) an epsilon
(b) an electron
(c) a proton
(d) a meson
Answer:
In a good conductor the energy gap between the conduction band and the valence bond is
(a) Wide
(b) Infinite
(c) Narrow
(d) Zero
Answer:
Any data and instruction entered in the memory of a computer is
(a) Input
(b) Storage
(c) Output
(d) Information
Answer: