Question is ⇒ Which of the following bulbs operates on least power ?, Options are ⇒ (A) GLS bulb, (B) Torch bulb, (C) Neon bulb, (D) Night bulb, (E) , Leave your comments or Download question paper.

Question is ⇒ Which of the following bulbs operates on least power ?, Options are ⇒ (A) GLS bulb, (B) Torch bulb, (C) Neon bulb, (D) Night bulb, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Which of the following bulbs operates on least power ?
A.	GLS bulb [Wrong Answer]
B.	Torch bulb [Correct Answer]
C.	Neon bulb [Wrong Answer]
D.	Night bulb [Wrong Answer]
View Answer 22 -10 Explanation:- Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ Co-efficient of utilisation depends upon
colour of the walls
colour of ceiling
size of the room
all of the above

⇒ In case of ____ least illumination level is required.
skilled bench work
drawing offices
   hospital wards
fine machine work

⇒ A substance which change its electrical resistance when illuminated by light is called
photoelectric
photovoltaic
phatoconductive
none of the above

⇒ A mercury vapour lamp gives ____ light.
white
pink
yellow
greenish blue

⇒ Luminous flux is
the light energy radiated by sun
the part of light energy, radiated by sun, which is received on the earth
the rate of energy radiation in the form of light waves
none of the above

⇒ For precision work the illumination 'level required is of the order of
500-1000 lumens/m²
200-400 lumens/m²
   50-100 lumens/m²
10-25 lumens/m²

⇒ The gas filled in vacuum filament lamps is
nitrogen
argon
air
none

⇒ When an electric bulb is broken it produces bang, this is due to
vacuum inside the bulb
pressure of air in the bulb
pressure inside is equal to that outside
none of the above

⇒ Sky appears blue because of
refraction
reflection
radiation
scattering of light over dust particles

⇒ In fluorescent tubes ballast resistance is connected in series with the choke
to reduce stroboscopic effects
when tube operates on D.C. supply
when supply frequency is low
to reduce radio interference

⇒ The unit of luminous flux is
watt/m²
lumen
lumen/m²
watt

⇒ Glare is reduced by
using diffusers
increasing the height of the lamp
using reflectors to cut-off the light at certain angle
all of the above

⇒ Filament lamp at starting will take current
less than its full running current
equal to its full running current
more than its full running current

⇒ ____ is a cold cathode lamp.
Fluorescent lamp
Neon lamp
   Mercury vapour lamp
Sodium vapour lamp

⇒ The cost of a fluorescent lamp is more than that of incandescent lamp because of which of the following factors ?
More labour is required in its manufacturing
Number of components used is more
Quantity of glass used is more
All of the above factors

⇒ In houses the illumination is in the range of
2-5 lumens/watt
10-20 lumens/watt
35-45 lumens/watt
60-65 lumens/watt

⇒ ____ cannot sustain much voltage fluctuations.
Sodium vapour lamp
Mercury vapour lamp
   Incandescent lamp
Fluorescent lamp

⇒ Colour of light depends upon
frequency
wave length
both (a) and (b)
speed of light

⇒ Luminous efficiency of a fluorescent tube is
10 lumens/watt
20 lumens/watt
lumens/watt
60 lumens/watt

⇒ On which of the following factors does the depreciation or maintenance factor depend ?
Lamp cleaning schedule
Ageing of the lamp
Type of work carried out at the premises
All of above

⇒ Most affected parameter of a filament 'lamp due to voltage change is
wattage
life
   luminous efficiency
light output

⇒ For the same lumen output, the running cost of the fluorescent lamp is
equal to that of filament lamp
less than that of filament lamp
more than that of filament lamp
any of the above

⇒ The filament of a GLS lamp is made of
tungsten
copper
carbon
aluminium

⇒ Illumination of one lumen per square metre is called
lumen metre
lux
foot candle
candela

⇒ Which of the following lamps is the 'cheapest for the same wattage ?
Fluorescent tube
Mercury vapour lamp
GLS lanip
Sodium vapour lamp

⇒ A poor man for his kitchen will make use of
fluorescent tube
incandescent lamp
sodium vapour lamp
high pressure mercury vapour lamp

⇒ In ligting circuit using filament lamps 1% voltage drop results into
no loss of light
1.5 percent loss in the light output
3.5 percent loss in the light output
15 percent loss in the light output

⇒ For the same power output
high voltage rated lamps will be more sturdy
low voltage rated lamps will be more sturdy
both low and high voltage rated lamps will be equally sturdy

⇒ The level of illumination on a surface least depends on
ambient temperature
candle power of the source
distance of the source
type of reflector used

⇒ In an incandescent lamp bird cage filament is usually used in vacuum bulb so as to
reduce the oxidation phenomenon
reduce the convection losses
have uniform radiations
increase the life span of the filament