4521: Which one of the following chemicals is responsible for the depletion of ozone layer in the atmosphere?
(a) Chlorofluorocarbons
(b) Nitrous oxide
(c) Sulphur dioxide
(d) Carbon dioxide
4522: According to ancient Indian cosmogonic ideas the sequential order of the cycle of four aeons (Yugas) is
(a) Dvapara, Krita, Treta and Kali
(b) Krita, Dvapara, Treta and Kali
(c) Krita, Treta, Dvapara and Kali
(d) Treta, Dvapara, Kali and Krita
4523: Match List I (Oxdiation number) with List II (The element) and select the correct answer using the codes given below this lists:
List I List II
(Oxidation number) (The element)
A. 2 1. Oxidation number of Mn in MnO2
B. 3 2. Oxidation number of S in H2S2O7
C. 4 3. Oxidation number of Ca in CaO2
D. 6 4. Oxidation number of Al in NaAIH4
Codes:
A B C D
(a) 3 4 1 2
(b) 4 3 1 2
(c) 3 4 2 1
(d) 4 3 2 1
4524: The head of the military department under the reorganised central machinery of administration during Akbar's reign was
(a) Diwan
(b) Mir Bakshi
(c) Mir Saman
(d) Bakshi
4525: In the context of food and nutritional security of India, enhancing the 'Seed Replacement Rates' of various crops helps in achieving the food production targets of the future. But what is/are the constraint/ constraints in its wider/greater implementation?
1. There is no National Seeds Policy in place.
2. There is no participation of private sector seed companies in the supply of quality seeds of vegetables and planting materials of horticultural crops.
3. There is a demand-supply gap regarding quality seeds in case of low value and high volume crops.
Select the correct answer using the code given below.
(a) 1 and 2
(b) 3 only
(c) 2 and 3
(d) None