61)Biodiverstiy forms the basis for human existence in the following ways :
1. Soil formation
2. Prevention of soil erosion.
3. Recycling of waste
4. Pollination of crops
Select the correct answer using thew codes given below :
Answer: Option D
Biodiversity is our life support system. It regulates climatic proccess, breakdowns waste and recycles nutrients, filters and puriies water, act as buffer against floods, mailtains soil fertility, purifies air and provides natural resources like wood, textiles and food and so on.
Hence option D is correct.
62)Aspartame is an artificial sweetener sold in the market. It consists 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 ?
Answer: Option D
Aspartamate is artificial sweetner which is almost 200 times sweeter than sucrose and as a result it produces 4 Kilo Cal of energy per gram when metabolised. Due to this property aspartamate needed to produce a sweet taste is so small and its caloric contribution is negligible upon oxidation.
Hence, Option D is correct.
63)What was the purpose with which Sir William Wedderburn and W.S.Caine had set up the Indian Parliamentary Committee in 1893?
Answer: Option A
On 28 December 1885, the Indian National Congress was founded in Bombay, with 72 delegates in attendance.
•A O Hume assumed office as the General Secretary.
•Womesh Chandra Banerjee was the President.
•The only British Members were William Wedderburn and Justice John Jardine.
Wedderburn had entered the parliament as a liberal member in 1893. In the same year along with W S Cine he set up Indian Parliamentary committtee to voice India’s girevances within the house of commons.
Hence, Option A is correct.
64)What is the difference between a CFL and an LED lamp ?
1. To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material.
2. The average life span of a CFL is much longer than that of an LED lamp.
3. A CFL is less energy-efficient is compared to an LED lamp.
Which of the statements given above is/are correct?
Answer: Option C
For the production of light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material. Though CLFs have been used much enthusiastically, LEDs are beginning to surpass them as they require much less energy than CLFs. Also LEDs last 10 times longer than that of CLFs.
Hence Option 3 is correct.
65)Recently “oilzapper” was in the news. What is it ?
Answer: Option A
The new technique of using the bacteria to get rid of oil spill has been called “Oil Zapping”. Oil Zapping is a bio-remediation technique involving the use of ‘oil zapping’ bacteria. It was employed to clean up the Mumbai shoreline affected by the oil spill that occurred in August 2010.
There are five different bacterial strains that are immobilized and mixed with a carrier material such as powdered corncob. This mixture of five bacteria is called Oil Zapper. Oilzapper feeds on hydrocarbon compounds present in crude oil and the hazardous hydrocarbon waste generated by oil refineries, known as Oil Sludge and converts them into harmless CO2 and water. The Oilzapper is neatly packed into sterile polythene bags and sealed aseptically for safe transport. The shelf life of the product is three months at ambient temperature.
The technique was used successfully and 130,000 tons of oily sludge/ oil contaminated soil was treated as per the leading news sources.
Hence Option A is correct.