What is the difference between Bluetooth and Wi-Fi devices?
What is the difference between Bluetooth and Wi-Fi devices? [UPSC Civil Services Exam – 2011 Prelims] (a) Bluetooth uses 2.4 GHz radio frequency band, whereas Wi-Fi can use 2.4 GHz or 5 GHz frequency band (b) Bluetooth is used for Wireless Local Area Networks (WLAN) only, whereas Wi-Fi is used for Wireless Wide Area Networks […]
What is the difference between a CFL and an LED lamp? To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material. The average life span of a CFL is much longer than that of an LED lamp. A CFL is less energy-efficient as compared to an LED lamp. Which of the statement(s) given above is/are correct?
What is the difference between a CFL and an LED lamp? To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material. The average life span of a CFL is much longer than that of an LED lamp. A CFL is less energy-efficient as compared to an LED lamp. […]
A layer in the Earth’s atmosphere called ionosphere facilities radio communication. Why? The presence of ozone causes the reflection of radio waves to earth. Radio waves have a very long wavelength. Which of the statements given above is/are correct?
A layer in the Earth’s atmosphere called ionosphere facilities radio communication. Why? The presence of ozone causes the reflection of radio waves to earth. Radio waves have a very long wavelength. Which of the statements given above is/are correct? [UPSC Civil Services Exam – 2011 Prelims] (a) 1 only (b) 2 only (c) Both 1 […]
When the bark of a tree is removed in a circular fashion all around near its base, it gradually dries up and dies because
When the bark of a tree is removed in a circular fashion all around near its base, it gradually dries up and dies because [UPSC Civil Services Exam – 2011 Prelims] (a) Water from soil cannot rise to aerial parts. (b) Roots are starved of energy. (c) Tree is infected by soil microbes. (d) Roots […]
What is difference between asteroids and comets? Asteroids are small rocky planetoids, while comets are formed of frozen gases held together by rocky and metallic material. Asteroids are found mostly between the orbits of Jupiter and Mars, while comets are found mostly between Venus and mercury. Comets show a perceptible glowing tail, while asteroids do not. Which of the statements given above is/are correct?
What is difference between asteroids and comets? Asteroids are small rocky planetoids, while comets are formed of frozen gases held together by rocky and metallic material. Asteroids are found mostly between the orbits of Jupiter and Mars, while comets are found mostly between Venus and mercury. Comets show a perceptible glowing tail, while asteroids do […]
A married couple adopted a male child. A few years later, twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive, and O positive. The blood group of the adopted son is?
A married couple adopted a male child. A few years later, twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive, and O positive. The blood group of the adopted son is? [UPSC Civil Services […]
Aspartame is an artificial sweetener sold in the market. It consist of amino acids and provides calories like other amino acids. Yet, it is used as a low calorie sweetening agent in food items. What is the basis of this use?
Aspartame is an artificial sweetener sold in the market. It consist of amino acids and provides calories like other amino acids. Yet, it is used as a low calorie sweetening agent in food items. What is the basis of this use? [UPSC Civil Services Exam – 2011 Prelims] (a) Aspartame is as sweet as table […]
A company marketing food products advertises that its items do not contain trans-fats. What does this campaign signify to the customers? The food products are not made out of hydrogenated oils. The food products are not made out of animal fats. The oils used are not likely to damage the cardiovascular health of consumers. Which of the statements given above is/are correct?
A company marketing food products advertises that its items do not contain trans-fats. What does this campaign signify to the customers? The food products are not made out of hydrogenated oils. The food products are not made out of animal fats. The oils used are not likely to damage the cardiovascular health of consumers. Which […]
Regular intake of fresh fruits and vegetables is recommended in the diet since they are a good source of antioxidants .How do antioxidants help a person maintain health and promote longevity?
Regular intake of fresh fruits and vegetables is recommended in the diet since they are a good source of antioxidants .How do antioxidants help a person maintain health and promote longevity? [UPSC Civil Services Exam – 2011 Prelims] (a) They activate the enzymes necessary for vitamin synthesis in the body and help prevent vitamin deficiency. […]
The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is reason?
The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is reason? [UPSC Civil Services Exam – 2011 Prelims] (a) Ice is a bad conductor of heat. (b) Since the surface of the lake is at the same temperature as the air, no heat is […]
