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The following question based on electric current and magnetism topic of general science mcq
(a) suspended freely in air
(b) bent into the form of a circular ring
(c) placed in an external magnetic field
(d) All of the above
The correct answers to the above question in:
Answer: (b)
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Read more physics gk Based General Science Questions and Answers
Question : 1
Magnets attract magnetic substances are iron, nickel, cobalt, etc. They can also repel
a) diamagnetic substances
b) paramagnetic substances
c) ferromagnetic substances
d) non-magnetic substances
Answer »Answer: (a)
Question : 2
Reverse bias applied to a junction diode
a) lowers the potential barrier
b) raises the potential barrier
c) increases the minority carrier current
d) increases the majority carrier current
Answer »Answer: (b)
In reverse biasing, the conduction across the p-n junction does not take place due to majority carriers but takes place due to minority carriers if the voltage of external battery is large.
The size of the depletion region increases thereby increasing the potential barrier.
Question : 3
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) 10 units
b) 1 unit
c) 0.1 unit
d) 100 units
Answer »Answer: (b)
Question : 4
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) 45°
b) 180°
c) 90°
d) 0°
Answer »Answer: (d)
Question : 5
Electric flux at a point in an electric field is
a) negative
b) zero
c) positive
d) none of these
Answer »Answer: (b)
As area of a point is zero,
∴ φ = E (ds) cosϴ = E cosϴ × 0 = Zero.
Question : 6
A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a
a) plano-converging lens
b) converging lens
c) diverging lens
d) plano-diverging len
Answer »Answer: (c)
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