Answer: D) 54 Explanation: By trial and error method from the given options, as 54 - 45 =  (1/11) x (45+54)  = 99/11  = 9 Hence this satisfies the given conditions. Then the woman's husband age is 54.

Answer: D) Carbondioxide Explanation: 72% of the totally emitted greenhouse gases is carbon dioxide.   Hence, Carbon dioxide (Co2) is predominantly responsible for Global warming.

Answer: A) 1900 Explanation: Given 2000 ---- 54 days The provisions for 2000 men for 39 days can be completed by 'm' men for only 20 days. i.e, 2000 ----- 39 days == m ---- 20 days => m x 20 = 2000 x 39 m = 3900 So total men for 20 days is 3900 => 2000 old and 1900 new reinforcement. Hence, reinforcement = 1900.

Answer: C) Arrogant Explanation: Here the given words Careful and Cautious are related in such a way that they are Synonyms of each other. Therefore, Similarly Boastful is synonym to the word Arrogant. Happily and Humble are Antonyms of Boastful and Surprisingly is the word not related to Boastful in any way.   So, Careful is to Cautious as Boastful is to Arrogant.

Answer: B) Skype is an example of VoIP software. Explanation: VOIP is an acronym for Voice Over Internet Protocol, or in more common terms phone service over the Internet. Voice over Internet Protocol is a category of hardware and software that enables people to use the Internet as the transmission medium for telephone calls by sending voice data in packets using IP rather than by traditional circuit transmissions of the PSTN.

Answer: D) Covalent bonds Explanation: Deoxyribose, which is a pentose, and a phosphate group are the two molecules together form the two sides of the DNA i.e, A sugar (deoxyribose) and a phosphate. DNA is a double-stranded molecule twisted into a helix (think of a spiral staircase). Each spiraling strand, comprised of a sugar-phosphate backbone and attached bases, is connected to a complementary strand by non-covalent hydrogen bonding between paired bases. The bases are adenine (A), thymine (T), cytosine (C) and guanine (G). A and T are connected by two hydrogen bonds. G and C are connected by three hydrogen bonds.

Answer: B) 4 days Explanation: Given 10 men take 15 days to complete a work => Total mandays = 15 x 10 = 150 Let the work be 150 mandays. => Now 37 men can do 150 mandays in 150/37 =~ 4 days

Answer: B) Accoustics Explanation: Accoustics is a subject deals with the Study of sound   Aesthetics is a Philosophy of fine arts   The science or art of flight is called Aeronautics   The science of soil management is called Agronomy.