Answer: A) Air Explanation: Light travels fastest in Vacuum. The fastest thing in the whole universe is the speed of light in a vacuum like outer space. It is about 2.99 x 108 m/s.

Answer: B) Rs. 6540 Explanation: Given C.I = 5984, R = 20% , T = 2yrs  C.I = P1+201002-1   5984 =    => P = (5995x25)/11   P = Rs. 13625   Now S.I = PTR/100   SI = (13625 x 8 x 6)/100 = Rs. 6540

Answer: A) CBSE Explanation:

Answer: C) 6 m/h Explanation: let, speed of Ali=X mph and Faizer=Y mph Now, relative speed when Ali is walking int the same direction with Faizer= (X-Y)mphhence, according to question, 27/(X-Y)=9 ; solving X-Y=3; --- (1) Now relative speed when walking in the opposite direction= (X+Y) mphhence, according to question, 27/(X+y)=3; solving X+Y=9; --- (2) solving 1 and 2 we get X=6 and Y=3, where X is the speed of Ali.

Answer: D) Hydrogen Explanation: Because of its being pollution free and  combustion efficient, Hydrogen gas is  called fuel of future. Because of its origin in marshy places, Methane is called as 'Marsh Gas'.

Answer: D) January 12 Explanation: National Youth Day is celebrated in India on 12 January on the birthday of Swami Vivekananda. In 1984 the Government of India declared the day as the National Youth Day and since 1985 the event is celebrated in India every year.

Answer: B) Karl Marx Explanation: Das Kapital, one of the major works of the 19th-century. Economist and philosopher Karl Marx (1818–83), wrote, in which he expounded his theory of the capitalist system, its dynamism, and its tendencies toward self-destruction.

Answer: D) 60 minutes Explanation: For 1 hour, 20 minutes is slower, then for 06 miuntes - 2 minutes is slower30 minutes - 10 minutesActual time | false time 12 12 01 PM 12:40 PM (20 minutes slower) 02 PM 01:20 PM 03 PM 02:00 PM So, when actual time is 3pm, the false time is 2 pm.So, it loses 60 minutes when it shows 2 pm.