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The following question based on electric current and magnetism topic of general science mcq
(a) Low melting point, low specific resistance
(b) High melting point, low specific resistance
(c) High melting point, high specific resistance
(d) Low melting point, high specific resistance
The correct answers to the above question in:
Answer: (d)
Fuse wire should be such that it melts immediatley when strong current flows through the circuit. The same is possible if its melting point is low and resistivity is high.
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Read more physics gk Based General Science Questions and Answers
Question : 1
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 the above
Answer »Answer: (b)
Question : 2
Two magnets A and B are placed with like poles having one above another. What will happen?
a) A will move side ways
b) A will stuck to B
c) A will remain as in figure
d) Can't say
Answer »Answer: (c)
Unlike poles repel. The repulsive magnetic force will not allow the like poles to get stuck.
Question : 3
The filament of an electric bulb is of tungsten because
a) it is cheaper
b) its melting point is high
c) its resistance is negligible
d) filament is easily made
Answer »Answer: (b)
Question : 4
A wire of resistance 16 W is bent in the form of a circle. What is the effective resistance between diametrically opposite points?
a) 4 W
b) 1 W
c) 2 W
d) 8 W
Answer »Answer: (a)
Question : 5
An electric motor is a device
a) That works on the principle described by Fleming’s left hand rule
b) That converts electrical energy to mechanical energy
c) Both (a) and (b)
d) Neither (a) nor (b)
Answer »Answer: (c)
An electric motor is a device that converts electrical energy to mechanical energy.
Question : 6
Consider the following statements :
- An ammeter is always connected in series in the circuit.
- A voltmeter can only be connected in series in the circuit.
- A voltmeter has low resistance.
a) 1 only
b) 1 and 2
c) 2 and 3
d) 3 only
Answer »Answer: (a)
If you connected a voltmeter in series all you are doing is measuring the difference in potential across a strand of wire which will be zero (or very near).
To measure voltage you connect the voltmeter in parallel so that you measure the voltage from the – to the + or the voltage drop across a load.
For a voltmeter the higher the resistance the more accurate it is.
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