Practice Questions set 4 - general science mcq Online Quiz (set-1) For All Competitive Exams
Q-1) An electric bulb is connected to 220 V generator. The current is 0.5A. The power of the bulb is
(a)
(b)
(c)
(d)
Q-2) In electric apparatus ‘Earth’ is used
(a)
(b)
(c)
(d)
Q-3) An alternating current can be converted into direct current by a
(a)
(b)
(c)
(d)
Q-4) Gases are good conductors of electricity at
(a)
(b)
(c)
(d)
Q-5) Refractive index of an optical medium changes with- the nature of the medium.
- the change in the angle of incidence of the ray.
- colour of the incident ray.
Select the correct answer using the code given below:
(a)
(b)
(c)
(d)
Q-6) In the figure shown below, $L_1$ and $L_2$ are two lenses and are kept along the same axis. A parallel beam of light falling on $L_1$ leaves $L_2$ as a parallel beam: Consider the following statements.- Both L1 and L2 can be convex lenses.
- The distance between the two lenses can be equal to sum of their focal lengths.
Which of the statements given above is/are correct ?
(a)
(b)
(c)
(d)
Q-7) The energy band gap is minimum in
(a)
(b)
(c)
(d)
Explanation:
Maximum in insulators and minimum in metals.
Q-8) The polarity of an unmarked horse shoe magnet can be determined by using
(a)
(b)
(c)
(d)
Q-9) An oscillator is nothing but an amplifer with
(a)
(b)
(c)
(d)
Explanation:
A positive feedback from output to input in an amplifier provides oscillations of constant amplitude.
Q-10) The filament of a halogen lamp is an alloy of
(a)
(b)
(c)
(d)