Question
In the question below, a situation is given, followed by
two statements (1) and (2). You have to take the given statements to be true even if they seem to be at variance from commonly known facts. Carefully analyse the situation, and choose the option that depicts the correct relationship between the statements and situation. Situation: Researchers from Australia announced recently that they used a graphene-based product to make a water filter that can make highly-polluted sea water drinkable after just one pass. Statement 1: While graphene allows water to pass through it, it is almost completely impervious to liquids and gases (even relatively small helium molecules). Statement 2: Graphene has been described as the strongest material ever tested, almost 300 times stronger than steel.Solution
The situation tells us that graphene has been used to make a highly efficient water filter. 1 gives us the cause for using graphene to make it - it gives us a property of the substance that would be useful for this application to be successful. 2 is unrelated as it gives an additional property of the material, which would not play a role in making it a good choice for a water filter system. Thus, (d) is the right answer.
Find the circumference and area of a circle of radius 7 cm. Take π = 22/7.
The base of the triangular area is two times its height. If the cost of farming area is Rs. 2000 and Rs. 80 per hectare. Find its base (1 hectare = ...
The breadth of a rectangle is increased by 9 cm, it will become twice the length of the rectangle. If the new perimeter is 294 cm, then find the origina...
Two wires A and B are made of the same material and have the same length but different cross-sectional areas. If the resistance of wire A is 9 times the...
The cost of fencing a rectangular field at the rate of Rs. 5/metre is Rs. 350. If the length of the field is 11 metres more than its breadth, then find ...
In a rectangular floor of length and breadth of 19 metres and 6 metres, respectively, square tiles each of 2 metre edge length are to be laid. If the co...
The perimeter of an equilateral triangle is 36√3 cm. Find its height.
The volume of a cuboid is 480 cubic cm. If its length is 10 cm and breadth is 8 cm, find its height.
Find the length of a wire radius 0.40 cm which can completely cover the surface of a cylinder whose height is 1.6m and base radius 21 cm?
A wire, when bent in the form of a square encloses an area of 121 sq. cm. If the same wire is bent in the form of a circle, what is the area enclosed by...