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The following question based on electric current and magnetism topic of general science mcq
(a) π/4
(b) π/2
(c) 0
(d) π
The correct answers to the above question in:
Answer: (c)
The phase difference between output voltage and input signal voltage in common base transistor circuit is zero
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Read more physics gk Based General Science Questions and Answers
Question : 1
If the electrical resistance of a typical substance suddenly drops to zero then the substance is called
a) conductor
b) superconductor
c) semiconductor
d) insulator
Answer »Answer: (b)
Question : 2
Consider the following statement: The principle of total internal reflection is applicable to explain the
- Formation of mirage in desert.
- Formation of image in microscope.
- Colour of evening sky.
- Operation of optical fibres.
a) 2 and 3
b) 1 and 4
c) 3 and 4
d) 1 and 2
Answer »Answer: (b)
Question : 3
A device which converts electrical energy into mechanical energy is
a) Electric motor
b) Dynamo
c) Transformer
d) Inductor
Answer »Answer: (a)
Question : 4
Magnetism of a bar magnet can be destroyed if it is
- kept in the magnetic meridian.
- placed in a direction opposite to that of the Earth's horizontal intensity.
- heated to a temperature known as Curie temperature.
a) II and III only
b) I and III only
c) II only
d) I, II and III
Answer »Answer: (a)
Question : 5
Electrically charged particles from space travelling at speeds of several hundred km/sec can severely harm living beings if they reach the surface of the Earth. What prevents them from reaching the surface of the Earth?
a) Moisture in the upper layers of atmosphere prevents them from reaching the surface of the Earth
b) The Earth’s magnetic field diverts them towards its poles
c) Ozone layer around the Earth reflects them back to outer space
d) None of the statements (a), (b) and (c) given above is correct
Answer »Answer: (b)
Question : 6
A coin in a beaker filled with water appears raised. This phenomenon occurs because of the property of
a) total internal reflection of light
b) reflection of light
c) refraction of light
d) interference of light
Answer »Answer: (c)
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