3746: Assertion (A) :
Activated charcoal is used for decolourising sugar solution.
Reason (R) :
Activated charcoal absorbs the impurities on its surface.
(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
3747: Recently, there has been a concern over the short supply of a group of elements called 'rare earth metals'. Why?
1. China, which is the largest producer of these elements, has imposed some restrictions on their export.
2. Other than China, Australia, Canada and Chile, these elements are not found in any country.
3. Rare earth metals are essential for the manufacture of various kinds of electronic items and there is a growing demand for these elements.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
3748: For which one of the following countries is Spanish not an official language?
(a) Colombia
(b) Cuba
(c) Republic of Congo
(d) Chile
3749: Where it the volcanic mountain, Mount St. Helens located?
(a) United States of America
(b) Japan
(c) Philippines
(d) Chile
3750: The population growth rate in Kerala is the lowest among major Indian states. Which one of the following is the most widely accepted reason for this ?
(a) Kerala has made the highest investment in family planning
(b) Kerala has the highest literacy rate in India
(c) Kerala has invested heavily in promoting literacy and public health and placed high priority on social policies
(d) The population pyramid in Kerala has relatively fewer women in the reproductive age-group