3826: Two trains, each being 120 metres long, are running on parallel tracks in opposite directions at 40 metres/minute and 20 metres/minute respectively. How much time will they take to cross each other?
(a) 1 minute
(b) 2 minutes
(c) 3 minutes
(d) 4 minutes
3827: Between India and East Asia, the navigation time and distance can be greatly reduced by which of the following?
1. Deepening the Malacca straits between Malaysia and Indonesia.
2. Opening a new canal across the Kraisthmus between the Gulf of Siam and Andaman Sea.
Which of the statements given above is are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither I nor 2
3828: It is possible to produce algae based biofuels, but what is/are the likely limitation(s) of developing countries in promoting this industry?
1. Production of algae based biofuels is possible in seas only and not on continents.
2. Setting up and engineering the algae based biofuel production requires high level of expertise/technology until the construction is completed.
3. Economically viable production necessitates the setting up of large scale facilities which may raise ecological and social concerns.
Select the correct answer using the code given below:
a. 1 and 2 only
b. 2 and 3 only
c. 3 only
d. 1, 2 and 3
3829: To keep the seeds in good condition, we should keep it in a place which is:
(a) Warm and dry
(b) Warm and wet
(c) Cool and dry
(d) Cool and wet
3830: A person travelled a distance of 50 km in 8 hours. He covered a part of the distance on foot at the rate of 4 km per hour and a part on a bicycle at the rate of 10 km per hour. How much distance did he travel on foot?
(A) 20 km
(B) 10 km
(C) 40 km
(D) 30 km