Practice Physics gk - general science mcq Online Quiz (set-2) 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) In a common base amplifier the phase difference between the input signal voltage and the output voltage is
(a)
(b)
(c)
(d)
The phase difference between output voltage and input signal voltage in common base transistor circuit is zero
Q-3) What is the number of neutral points for a bar magnet with its north pole pointing geographical north?
(a)
(b)
(c)
(d)
Q-4) At magnetic poles, the angle of dip is
(a)
(b)
(c)
(d)
At poles, δ = 90°.
Q-5) The part of a transistor which is most heavily doped to produce large number of majority carriers is
(a)
(b)
(c)
(d)
Q-6) In the symbol of a transistor , the arrow head points in the direction of flow of
(a)
(b)
(c)
(d)
Q-7) The laws of electromagnetic induction have been used in the construction of a
(a)
(b)
(c)
(d)
Q-8) Which of the following sentences is/are correct about a conductor of electricity? - Metals in general are good conductors of electricity.
- Distilled water conducts electricity.
- Top water conducts electricity.
- Rubber is a bad conductor of electricity
(a)
(b)
(c)
(d)
Distilled water is insulator of electricity.
Q-9) Consider the following statements : - Diamagnetism is temperature independent.
- Paramagnetism is explained by domain theory.
- Above curie temperature a ferromagnetic material becomes paramagnetic.
- Magnetic susceptibility is small and negative for diamagnetic substance.
Identify incorrect statements:
(a)
(b)
(c)
(d)
Domain theory is for ferromagnetic substance.
Q-10) The current in the armature of a motor is reversed at every half cycle due to the action of a(n)
(a)
(b)
(c)
(d)
Q-11) Which of the following is most suitable for the core of electromagnets?
(a)
(b)
(c)
(d)
Soft iron is highly ferromagnetic.
Q-12) Transformers are used
(a)
(b)
(c)
(d)
Q-13) An electric bulb is filled with
(a)
(b)
(c)
(d)
Q-14) Zener diode is used as
(a)
(b)
(c)
(d)
For a wide range of values of load resistance, the current in the Zener diode may change but the voltage across it remains unaffected. Thus the output voltage across the Zener diode is a regulated voltage.
Q-15) What is the phenomenon of the moon to appear bigger in size as it approaches the horizon, called ?
(a)
(b)
(c)
(d)
Q-16) When an n–p–n transistor is used as an amplifier then
(a)
(b)
(c)
(d)
In an n-p-n transistor, the charge carriers, are free electrons in the transistor as well as in external circuit; these electrons flow from emitter to collector.
Q-17) The current in a generator armature is AC because
(a)
(b)
(c)
(d)
Q-18) A current I flows through a potential difference V in an electrical circuit containing a resistance R. The product of V and I, i.e., VI may be understood as
(a)
(b)
(c)
(d)
Q-19) Demagnetisation of magnets can be done by
(a)
(b)
(c)
(d)
Q-20) A fuse wire is characterized by
(a)
(b)
(c)
(d)