281: What is done to raise the dough while making bread?
(a) Alcohol is added
(b) Yeast is added
(c) Carbon dioxide is passed
(d) Air is passed
282: The following figure represents time vs. learning curves of two students, Q and R for learning a Mathematics lesson :
Which one of the following inferences can be drawn from the graph ?
(a) R started slowly in the beginning but got ahead of Q to complete learning the lesson
(b) Q started slowly and finished learning the lesson earlier than R
(c) R was always faster than Q in learning Mathematics
(d) Q was always faster than R in learning Mathematics
283: In the context of solving pollution problems, what is/are the advantage/advantages of bioremediation technique?
1. It is a technique for cleaning up pollution by enhancing the same biodegradation process that occurs in nature.
2. Any contaminant with heavy metals such as cadmium and lead can be readily and completely treated by bioremediation using microorganisms.
3. Genetic engineering can be used to create microorganisms specifically designed for bioremediation.
Select the correct answer using the code given below:
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
284: Qantas Airways belongs to:
(a) Australia
(b) West Germany
(c) East Germany
(d) New Zealand
285: Assertion (A):
The Central Rural Sanitation Programme was launched in 1986 to improve the quality of life of rural people in India.
Reason (R) :
Rural sanitation is a subject in the Concurrent List in the Constitution of India.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true