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The following question based on electric current and magnetism topic of general science mcq
- To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material.
- The average life span of a CFL is much longer than of an LED lamp.
- A CFL is less energy efficient as compared to an LED lamp.
(a) 1 and 3
(b) Only 1
(c) 2 and 3
(d) 1, 2 and 3
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 current I flows through a potential difference V in an electrical circuit containing a resistance R. The product of V and I, i.e., VI may be understood as
a) thermal power radiated by the circuit
b) resistance R
c) heat generated by the circuit
d) rate of change of resistance
Answer »Answer: (a)
Question : 2
Assertion (A):
In India, electricity distribution companies calculate the consumption of electricity in kWh.
Reason (R):
Electrical system in India works at a frequency of 60 Hz.
Code
a) (A) is true, but (R) is false
b) Both (A) and (R) are true and (R) is the correct explanation of (A)
c) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
d) (A) is false, but (R) is true
Answer »Answer: (a)
Question : 3
Consider the following statements: An ordinary light bulb has a rather short life because the:
- filament wire is not uniform.
- bulb cannot be evacuated completely.
- wires supporting the filament melt at high temperatures.
a) 1 and 2
b) 1 and 3
c) 2 and 3
d) 1, 2 and 3
Answer »Answer: (d)
The electric light bulb uses a glowing wire filament heated by electrical resistance to white to generate light (a process known as thermal radiation).
The ‘bulb’ is the glass enclosure which keeps the filament in a vacuum or low-pressure noble gas. Complete evacuation of bulb is not possible. A small quantity of gases left behind which expands on heating by heat through filament.
Moreover, the wires supporting the filament sometimes melt due to high heat generated as a result of high resistance of filament. Thus, these factors leads to short life span of ordinary bulb.
Question : 4
The magnetic compass is not useful for navigation near the magnetic poles. Since
a) H = 0
b) R = 0
c) V = 0
d) ϴ = 0°
Answer »Answer: (a)
Near the magnetic poles, H = 0, therefore, magnetic compass will not work.
Question : 5
Which one of the following is a non-magnetic substance?
a) Nickel
b) Iron
c) Cobalt
d) Brass
Answer »Answer: (d)
Question : 6
Which of the following sentences is/are correct about a conductor of electricity?
- Metals in general are good conductors of electricity.
- Distilled water conducts electricity.
- Top water conducts electricity.
- Rubber is a bad conductor of electricity
a) 1, 3 and 4
b) 1 and 2
c) 2 and 3
d) 1, 2 and 3
Answer »Answer: (a)
Distilled water is insulator of electricity.
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