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The following question based on electric current and magnetism topic of general science mcq
(a) current driven devices
(b) voltage driven devices
(c) power driven devices
(d) resistance driven devices
The correct answers to the above question in:
Answer: (a)
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Read more physics gk Based General Science Questions and Answers
Question : 1
A dynamo which is said to generate electricity actually acts as a
a) Converter of energy
b) Source of ions
c) Source of electric charge
d) Source of electrons
Answer »Answer: (a)
Question : 2
One way in which the operation of an n-p-n transistor differs from that of a p-n-p
a) the emitter junction injects minority carriers into base region of the p-n-p
b) the emitter injects holes into the base of the p-n-p and electrons into the base region n-p-n
c) the emitter junction is reverse biased in n-p-n.
d) the emitter injects holes into the base of n-p-n
Answer »Answer: (b)
Question : 3
Eddy currents are produced when
a) a metal is kept in steady magnetic field
b) a circular coil is placed in a magnetic field
c) a metal is kept in varying magnetic field
d) through a circular coil, current is passed
Answer »Answer: (c)
Question : 4
A fuse is used in mains electric supply as a safety device. Which one of the following statements about the fuse is correct?
a) It must have a low melting point
b) It is connected in parallel with the main switch
c) It is made mainly from silver alloys
d) It must have very high resistance
Answer »Answer: (a)
Afuse is a type ofsacrificial overcurrent protection device. Its essential component is a metal wire or strip that melts when too much current flows.
Short circuit, overload or device failure is often the reason for excessive current.
The resistance of the element used in fuse generates heat due to the current flow. It has low melting point so that it melts when a short-circuit or overloading takes place.
Question : 5
For a transistor amplifier, the voltage gain
a) is high at high and low frequencies and constant in the middle frequency range
b) is low at high and low frequencies and constant at mid frequencies
c) remains constant for all frequencies
d) None of these
Answer »Answer: (b)
Question : 6
Match list-I with list -II:
List I | List II |
A. Resistance of resistance box | 1. Tungsten |
B. Fuse wire | 2. Maganin |
C. Bulb | 3. Tin-lead alloy |
D. Insulator | 4. Glass |
a) A – 4 ; B – 3 ; C – 2 ; D – 1
b) A – 3 ; B – 1 ; C – 2 ; D – 4
c) A – 4 ; B – 2 ; C – 3 ; D – 1
d) A – 2 ; B – 3 ; C – 1 ; D – 4
Answer »Answer: (d)
A → 2; B → 3; C → 1; D → 4
- Maganin is used in resistance boxes.
- Fuse wire is made up of Tin-lead alloy. It’s resistance is very high and melting point is very low.
- Filament of bulb is made up of Tungsten.
- Glass is insulator of electricity.
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