Practice Questions test - general science mcq Online Quiz (set-1) For All Competitive Exams
Q-1) Which one of the following is the correct angle between the incident and reflected rays when a ray of light incident normally on a plane mirror?
(a)
(b)
(c)
(d)
Q-2) Which of the following is the best insulator of electricity?
(a)
(b)
(c)
(d)
Ebonite is the best insulator.
Q-3) The potential barrier, in the depletion layer, is due to
(a)
(b)
(c)
(d)
Q-4) Which of the following metals is used as filament in lighting bulbs?
(a)
(b)
(c)
(d)
Q-5) The resistance of a thin wire in comparison of a thick wire of the same material
(a)
(b)
(c)
(d)
Q-6) The primary cell which is used in daily life is
(a)
(b)
(c)
(d)
Q-7) Electric flux at a point in an electric field is
(a)
(b)
(c)
(d)
As area of a point is zero,
∴ φ = E (ds) cosϴ = E cosϴ × 0 = Zero.
Q-8) An electric lamp of 100 watt is used for 10 hours per day. The ‘units’ of energy consumed in one day by the lamp is
(a)
(b)
(c)
(d)
Q-9) When a semiconductor is heated, its resistance
(a)
(b)
(c)
(d)
Q-10) In an A.C. circuit with voltage V and current I the power dissipated is
(a)
(b)
(c)
(d)
Power dissipated = $E_{rms}. I_{rms} = (E_{rms}) (I_{rms})$cosϴ
Hence, power dissipated depends upon phase difference.