1) The electric firring are earthed so that
a) electricity may not leak
b) there may be a smooth flow of electricity
*c)current may pass to the earth in case of a short circuit, without causing any harm
d) to prevent short circuit
2) When common salt is mixed with ice, the melting point?
*a) is lowered
b) is raised
c) remains the same
d) is first lowered and then raised
3) The weight of iron is more after rusting because
a) it has expanded into a greater volume
b) rust contains twice as many iron atoms
c) of the additional oxygen it contains
*d) iron undergoes reduction
4) A galvanometer can be converted into ammeter by connecting
*a) low resistance in parallel
b) low resistance in series
c) high resistance in parallel
d) high resistance in series
5) if c is the velocity of light and r is the frequency of the photon , the momentum associated with the photon is
a) hγc
*b) hγ/c
c) γ/c
d) ηx/y
6) The propagation of light through optical fibres is based on
a)diffraction
b) refraction
*c) total internal reflection
d) reflection
7) A disadvantage of the laser printed is
a) it is quieter than an impact printer
b) the ouput is of a lower quality
c) it is very slow
*d) none of these
8) Nuclei with equal number of neutrons are
a) isotopes
b) isobars
c) isomers
*d) isotones
9) The bifocal lens was invented by
a) Galileo
*b) Benjamin franklin
c) snell
d) alessandro volta
10) When oil is poured on the surface of water its surface tension
a) increase
*b) decreases
c) remains constant
d) increases first and then decreases
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