556: Graphene is frequently in news recently. What is its importance?
1. It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and has high optical transparency.
4. It can be used as 'conducting electrodes' required for touch screens, LCDs and organic LEDs.
Which of the statements given above are correct?
(a) 1 and 2 only
(b) 3 and 4 only
(c) 1, 2 and 4 only
(d) 1, 2, 3 and 4
557: Consider the following statemtns:
1. Total land area of Earth is approximately 1475 lakh square kilometers.
2. Ratio of land area to water area of Earth is approximately 1 : 4.
3. Maximum percentage of Earth's water is in the Pacific Ocean.
Which of the following statements given above is/are correct?
(a) 1 only
(b) 3 only
(c) 2 and 3
(d) 1 and 3
558: Who led the extremists before the arrival of Gandhiji on the political scene for freedom struggle?
(a) Bal Gangadhar Tilak
(b) Dadabhai Naoroji
(c) Gopal Krishna Gokhale
(d) Subhash Chandra Bose
559: If you walk through countryside, you are likely to see some birds stalking alongside the cattle to seize the insects disturbed by their movement through grasses. Which of the following is / are such bird/birds?
1. Painted Stork
2. Common Myna
3. Black-necked Crane
Select the correct answer using the code given below.
(a) 1 and 2
(b) 2 only
(c) 2 and 3
(d) 3 only
560: The annual agricultural production of a product for the period 1991-92 to 1998-99 is shown in the figure given above
Which one of the following is the product in question ?
(a) Pulses
(b) Wheat
(c) Oilseeds
(d) Rice