Q1. Optical fibres are based on the phenomenon of:
(a)Interference
(b)Dispersion
(c)Diffraction
(d)Total internal Reflection
Ans.(d)
Q2. Which among the following waves is used for communication by artificial satellites?
(a) Micro waves
(b) Radio waves
(c) A. M.
(d) Frequency of 1016 series
Ans.(a)
Q3.The rate of transfer of charges through a circuit is called?
(a)Potential Difference
(b)Energy
(c)Resistance
(d)Current
Ans.(d)
Q4.The power dissipated in a resistance is given by?
(a)I²R
(b)IV
(c)V²/R
(d)All of these
Ans.(d)
Q5.Ohm’s law obeyed in?
(a)a metallic conductor
(b)a semi conductor
(c)in all of the above
(d)an electron tube
Ans.(a)
Q6.When a p.d is applied across a conductor, the electrons experience a force in?
(a)the direction of the electric field.
(b)the direction perpendicular to the established electric field
(c)the direction opposite to the established electric field.
(d)None of above
Ans.(c)
Q7.All electrical appliances are connected in parallel to each other between the main line and the neutral wire to get?
(a)the same current
(b)different current and the same potential difference
(c)None of these
(d)the same potential difference
Ans.(b)
Q8.If the wire of uniform area of cross-section is cut into two equal parts, the resistivity of each parts will be?
(a)doubled
(b)Halved
(c)four times
(d)Remain the same
Ans.(d)
Q9.In a thermocouple?
(a)mechanical energy is converted into heat energy
(b)chemical energy is converted into electrical energy
(c)heat energy is converted into mechanical energy
(d)heat energy is converted into electrical energy.
Ans.(d)
Q10.Ohm is equivalent to?
(a)ampere / volt
(b)coulomb /volt
(c)volt/ampere
(d)volt /coulomb
Ans.(c)
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