786: 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
787: If a metal slab of size 1 m x 20 cm x 1 cm is melted to another slab of 1 mm thickness and 1 m width, then the length of the new slab thus formed will be:
(a) 200 cm
(b) 400 cm
(b) 600 cm
(d) 1000 cm
788: Which one of the following pairs is not correctly matched ?
(a) Jamnalal Bajaj : Satyagraha Ashram at Wardha
(b) Dadabhai Naoroji : Bombay Association
(c) Lala Lajpat Rai :. National School at Lahore
(d) Bal Gangadhar Tilak : Satya Shodhak Sabha
789: The monthly income of Komal and Asha are in the ratio of 4 : 3. Their monthly expenses are in the ratio of 3 : 2. However, both save Rs. 600 per month. What is their total monthly income ?
(a) Rs. 8,400
(b) Rs. 5,600
(c) Rs. 4,200
(d) Rs. 2,800
790: For which one of the following, is Satara well-known?
(a) Nuclear power plant
(b) Wind energy plant
(c) Thermal Power plant
(d) Hydro-electric plant