Bissoy.com
Doctors Medicines MCQs Q&A

The bulbs are usually filled with chemically inactive nitrogen and argon gases to 1. Increase the illumination of the bulb. 2. Prolong the life of the filament. 3. Change the heat profile of the filament. 4. Reduce the power consumption of the bulb. Which of the following statements is/are correct?

The bulbs are usually filled with chemically inactive nitrogen and argon gases to 1. Increase the illumination of the bulb. 2. Prolong the life of the filament. 3. Change the heat profile of the filament. 4. Reduce the power consumption of the bulb. Which of the following statements is/are correct? Correct Answer 2 only

The correct answer is 2 only.

Key Points

  • In a bulb, when current passes through the filament, it produces light and heat both.
  • Metals like tungsten (which are used as filament) glowing brightly may oxidize at high temperatures if normal gases are filled inside the bulb.
  • Filling of inert gases like nitrogen and argon prevents oxidation of the filament and increase its life. So, statement is 2 is correct.
  • Inert gases do not play any other role like increasing power efficiency, illumination, changing heat profile of the filament, etc. So, statements 1, 3, and 4 are NOT correct.
  • They may reduce the heat emitted by the bulb to some extent as the bulb's inside is properly insulated. 

Related Questions

You want to decorate your house with 300 light bulbs of four selected colors. You already have 32 red, 26 green and 9 yellow bulbs. You have no blue bulbs, each bulb costs Rs. 15 and you get 20% discount if you purchase 50 or more bulbs of the same color and 30% discount when you purchase 70 or more bulbs of new color. How much would you spend if you decorated your house with an equal number of bulbs of each color?
Three Statements are given followed by four conclusions numbered I, II, III and IV. Assuming the statements to be true, even if they seem to be at variance with commonly know facts, decide which of the conclusions logically follow (s) from the statements. Statements: Some bulbs are tubelights. No tubelight is switch. No bulb is watch. Conclusions: I. No watch is tubelight. II. Some bulbs are switches. III. Some tubelights are bulbs. IV. No watch is bulb. 
The pic chart given below shows the number of bulbs manufactured by a company in 6 years. The number of bulbs manufactured in a particular years is shows as a percentage of total number of bulbs manufactured in 6 years. If the total number of bulbs manufactured in 6 years is 100000, then what is the difference in the number of bulbs manufactured in year Y3 and Y5?
Inactive nitrogen and argon gases are usually used in electric bulbs in order to
Which one of the following sets is incorrect to show the inter-relationships among price elasticity coefficient, change in price and change in total revenue ? Price elasticity coefficient Change in price Change in Total Revenue 1) Zero Increase Decrease Increase Decrease (2) Less than 1 Increase Decrease Decrease Increase (3) Equal to 1 Increase Decrease No change No change (4) More than 1 Increase Decrease Decrease Increase  
Various gases present in air are oxygen, nitrogen, argon and neon. The boiling points of these gases are –183, –196, –186 and –246 degrees Celsius, respectively. These gases are separated from each other by the process of fractional distillation. Which of the following statements about the order in which these gases get separated is correct?
Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements. Statements: All bulbs are tubes. Some bulbs are tumblers. Conclusions: I. No bulb is a tube. II. Some tumblers are bulbs
A passage is given with five questions following it. Read the passage carefully and select the best answer to each question out of the given fouralternatives. Teaching about compassion and empathy in schools can help deal with problems of climate change and environmental degradation,” says Barbara Maas, secretary,
Standing Committee for Environment and Conservation, International Buddhist Confederation (IBC). She was in New Delhi to participate in the IBCs governing
council meeting, December 10-11, 2017. “We started an awareness campaign in the year 2005-2006 with H H The Dalai Lama when we learnt that tiger skins were
being traded in China and Tibet. At that time, I was not a Buddhist; I wrote to the Dalai Lama asking him to say that this is harmful and he wrote back to say, “We
will stop this.” He used very strong words during the Kalachakra in 2006, when he said, If he sees people wearing fur and skins, he doesnt feel like living. This sent
huge shock waves in the Himalayan community. Within six months, in Lhasa, people ripped the fur trim of their tubba, the traditional Tibetan dress. The messenger was ideal and the audience was receptive,” says Maas who is a conservationist. She has studied the battered foxs behavioral ecology in Serengeti,Africa. She heads the endangered species conservation at the Nature and Biodiversity Conservation Union (NABU) International Foundation for Nature, Berlin. “I metSamdhong Rinpoche, The Karmapa, HH the Dalai Lama and Geshe Lhakdor and I thought, if by being a Buddhist, you become like this, I am going for it, “says Maas, who led the IBC initiative for including the Buddhist perspective to the global discourse on climate change by presenting the statement, The Time to Act is Now: aBuddhist Declaration on Climate Change, at COP21 in Paris. “It was for the first time in the history of Buddhism that leaders of different sanghas came together to take a stand on anything! The statement lists a couple ofimportant things: the first is that we amass things that we dont need; there is overpopulation; we need to live with contentment and deal with each other and theenvironment with love and compassion,” elaborates Maas. She is an ardent advocate of a vegan diet because “consuming meat and milk globally contributes more toclimate change than all "transport in the world.” Turning vegetarian or vegan usually requires complete change of perspective before one gives up eating their favorite food. What are the Buddhist ways to bringabout this kind of change at the individual level? “To change our behavior, Buddhism is an ideal vehicle; it made me a more contented person,” says Maas, who grewup in Germany, as a sausage chomping, meat-loving individual. She says, “If I can change, so can anybody”. Why did Ms. Barbara Mass say “If I can change, so can anybody”?
The illumination of a bulb varies inversely as the square of the distance . If the illumination is 6 lux at a distance of 5 meters whet is illumination at a distance of 3 meters?
The number of chambers in an office is odd. Every chamber has fans and bulbs. The number of bulbs in each chamber is twice the number of fans in that chamber. The number of bulbs is the same in all the chambers. The total number of fans and bulbs in all the chambers is thirty. What is the total number of chambers in the office?