Railway exam general awarness,aptitude and current affairs questions

1)Layer of the atmosphere which is closer to the earth?
Answer=Troposphere
(The atmosphere is divided into the following significant spheres:
(1) troposphere, (2) stratosphere, (3) ozonosphere(mesosphere), (4) ionosphere, (5) exosphere
troposphere is the lower most part of the atmosphere in which we live.)
2)What is the use of choke coil fitted to fluorescent tubes?
Answer=It control the current to prevent it from continuing to rise
3)The structure of Lothal indicates to be which of the following?
Answer=Dockyard
(It is located gujarat province across the river bank of Bhogava,it was discovered by SR rao)
4)Where is orgin of world famous "Nile"river?
Answer=Victoria lake
(It is also world lengthiest river and 6853 k.m length)
5)What is the major source of formation of cholera disease?
Answer=vibrio cholerae
(it is transmitted through contaminated food and water and it affects intestine and major symptoms are vomiting,acute diarrhoea,etc...)
6) What is the rank of  India in Intellectual property index?
Answer=37
(This survey is released by united states chamber of commerce(USCC),india has ranked 37 among 38 countries,first position is united states)
7)Which railway  project is recently sanctioned by union government of india?
Answer=Agartala-Akhauara railway project
(it is connect kolkata with tripura via bangaladesh)
8) Sushil Koirala,who died recently, belongs to which country?
Answer=Nepal
9)Recently,which country prince has arrived in india?
Answer= Sheikh Mohammed bin Zayed Al Nahyan
(he is the price of Abu dhabi)
10)Where is located chhatrapati shivaji international airport?
Answer=Mumbai
(it was opened year of 1942)
11)In certain code"648" means"BOOKS ARE GOOD" and "956" means "I LIKE BOOKS" using there codes.how will you code to word "BOOKS"?
Answer=6
(6=Books,4=Are,8=Good
 9=I,5=Like,6=Books)
12)Father's age is five times to that of the son, After 20 years, the father is of 40 years. The what would be the age of the son?
Answer=24
(let,the son's age=x
father's age=5x
after 20 years son's age=x+20
father's age=5x+20
5x+20=40
son's age=4 years
After 20 years sons age=20+4=24)
13)If the cost price of 12 articls is equal to the selling price of 10 articles, then the profit percent is?
Answer=20%
(cost price=10,selling price=12
profit percentage=((12-10)/10)*100=20%)
14)The radius of a circular wheel is 1.75m.The number of revolutions that it will make in covering 11km is?
Answer=1000 revolutions
(Perimeter of the wheel=2IIr=2*(22/7)*1.75=11m
no of revolutions that the wheel will make in travelling 11km=11000/11=1000 revolutions)
15)A mixture contains alcohol and water in the ratio 2:1.If 3 litres of water is added to the mixture, the ratio becomes 2:3 find the quantity of alcohol in the given mixture.
Answer=3 litres
(let the quantity of alcohol and water be 2x and x respectively;then
2x/(x+3)=2/3
x=6/4(or)1.5
Alcohol in the given mixture=2x=2*1.5=3 litres)