421: Photo chemical smog is a resultant of the reaction among.
(a) NO2, O3 and peroxyacetyl nitrate in the presence of sunlight
(b) CO, O2 and peroxyacetyl nitrate in the presence of sunlight
(c) CO, CO2 and NO2 at low temperature
(d) High concentration of NO2, O3 and CO in the evening
422: With reference to Indias Five-Year Plans, which of the following statements is/are correct?
1. From the Second Five-Year Plan, there was a determined thrust towards substitution of basic and capital good industries.
2. The Fourth Five-Year Plan adopted the objective of correcting the earlier trend of increased concentration of wealth and economic power.
3. In the Fifth Five-Year Plan, for the first time, the financial sector was included as an integral part of the Plan.
Select the correct answer using the code given below:
(a) 1 and 2 only
(b) 2 only
(c) 3 only
(d) 1, 2 and 3
423: Which one among the following rivers is the longest?
(a) Lena
(b) Congo
(c) Amur
(d) Amazon
424: Hawala transactions relate to payments
(a) received in rupees against overseas currencies and vice versa without going through the official channels
(b) received for sale/transfer of shares without going through the established stock exchanges
(c) received as commission for services rendered to overseas investors/buyers/ sellers in assisting them to get over the red tape
and/or in getting preferential treatment
(d) made to political parties or to individuals for meeting election expenses
425: Assertion (A) :
Large cold storage plants use ammonia as refrigerant while domestic refrigerators use chlorofluorocarbons.
Reason (R) :
Ammonia can be liquefied at ambient temperatures at low pressures.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not a correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true