Which of the following can lead to food security problem?
1. Using agricultural and forest residues as feedstock for power generation
2. Using biomass for carbon capture and storage
3. Promoting the cultivation of energy crops
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In the context of using biomass, which of the following is/are the characteristic/characteristics of the sustainable production of biofuel?
1. Biomass as a fuel for power generation could meet all the primary energy requirements of the world by 2050
2. Biomass as a fuel for power generation does not necessarily disrupt food and forest resources
3. Biomass as a fuel for power generation could help in achieving negative emissions, given certain nascent technologies
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With reference to the passage, following assumptions have been mad :
1. Some climate-energy models suggest that the use of biomass as a fuel for power generation helps in mitigating greenhouse gas emissions
2. It is not possible to use biomass as a fuel for power generation without disrupting food and forest resources
Which of these assumptions is/are valid?

Which among the following is the most logical and critical inference that can be made from the above passage?

A class starts at 11:00 am and lasts till 2:27 pm. Four periods of equal duration are held during this interval. After every period, a rest of 5 minutes is given to the students. The exact duration of each period is:

Four friends A, B, C and D need to cross a bridge. A maximum of two persons can cross it at a time. It is night and they just have one lamp. Persons that cross the bridge must carry the lamp to find the way. A pair must walk together at the speed of slower person. After crossing the bridge, the person having faster speed in the pair will return with the lamp each time to accompany another person in the group. Finally, the lamp has to be returned at the original place and the person who returns the lamp has to cross the bridge again without lamp. To cross the bridge, the time taken by them is as follows : A: 1 minute, B: 2 minutes, C: 7 minutes and D: 10 minutes. What is the total minimum time required by all the friends to cross the bridge?

30g of sugar was mixed in 180 ml water in a vessel A, 40 g of sugar Was mixed in 280 ml of water in vessel B and 20 g of sugar was mixed in 100 ml of water in vessel C. The solution in vessel B is

In aid of charity, every student in a class contributes as many rupees as the number of students in that class. With the additional contribution of Rs. 2 by one student only, the total collection is Rs. 443. Then how many students are there in the class?

Anitas mathematics test had 70 problems carrying equal marks i.e., 10 arithmetic, 30 algebra and 30 geometry. Although she answered 70% of the arithmetic, 40% of the algebra and 60% of the geometry problems correctly, she did not pass the test because she got less than 60% marks. The number of more questions she would have to answer correctly to earn a 60% passing marks is:

In a class, there are 18 very tall boys. If these constitute three-fourths of the boys and the total number of boys is two-thirds of the total number of students in the class, what is the number of girls in the class?