set 9 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 9 EXERCISES
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The following question based on electric current and magnetism topic of general science mcq
(a) Magnetic needle
(b) Bar magnet
(c) Horse-shoe magnet
(d) All of the above
The correct answers to the above question in:
Answer: (d)
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Read more physics gk Based General Science Questions and Answers
Question : 1
Which one among the following is used to make periscope?
a) Plane mirror
b) Concave lens
c) Concave mirror
d) None of the above
Answer »Answer: (a)
Question : 2
Alternate current is not preferable
a) To transmit electric power
b) To charge storage battery
c) To run/start an electric motor
d) To heat up electric toaster
Answer »Answer: (b)
Question : 3
From a power station, the power is transmitted at a very high voltage because –
a) electricity at high voltage is less dangerous
b) it is generated only at high voltage
c) it is cheaper to produce electricity at high voltage
d) there is less loss of energy in transmission at high voltage
Answer »Answer: (c)
Question : 4
Which one of the statements given below is not correct?
a) The degree to which the magnetic field can penetrate a medium is known as the relative permeability of the medium
b) A vertical plane passing through the axis of a freely suspended magnet is called the magnetic meridian
c) A vertical plan passing through the axis of rotation of the Earth is called the geographical meridian
d) The relative permeability is not a dimensionless quantity
Answer »Answer: (d)
Question : 5
Two spheres A and B of exactly same mass are given equal positive and negative charges respectively. Their masses after charging
a) mass of A > mass of B
b) mass of A < mass of B
c) remains unaffected
d) nothing can be said
Answer »Answer: (b)
A loses electrons and B gains electrons. Therefore, mass of A < mass of B.
Question : 6
When a forward bias is applied to a p-n junction, it
a) reduces the majority carrier current to zero.
b) lowers the potential barrier.
c) raises the potential barrier.
d) None of these
Answer »Answer: (b)
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