546: Which of the following groups represents the correct order of four types of teeth in human beings?
(a) Incisors, premolars, molars, canines
(b) Incisors, canines, premolars, molars
(c) Molars, canines, incisors, premolars
(d) Canines, incisors, molars, premolars
547: 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
548: Biomass gasification is considered to be one of the sustainable solutions to the power crisis in India. In this context, which of the following statements is/are correct?
1. Coconut shells, groundnut shells and rice husk can be used in biomass gasification.
2. The combustible gases generated from biomass gasification consist of hydrogen and carbon dioxide only.
3. The combustible gases generated from biomass gasification can be used for direct heat generation but not in internal combustion engines.
Select the correct answer using the codes given below :
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
549: If a metal slab of size 1 m x 20 cm x 1 cm is melted to another slab of 1 mm thickness and 1 m width, then the length of the new slab thus formed will be:
(a) 200 cm
(b) 400 cm
(b) 600 cm
(d) 1000 cm
550: With reference to Union Budget, which of the following is/are covered under Non-Plan Expenditure?
1. Defence expenditure
2. Interest payments
3. Salaries and pensions
4. Subsidies
Select the correct answer using the code given below.
(a) 1 only
(b) 2 and 3 only
(c) 1, 2, 3 and 4
(d) None