421: A rectangular plot of lawn shown in the figure has dimensions x and y and is surrounded by a gravel pathway of width 2 m. What is the total area of the pathway ?
(a) 2x + 2y + 4
(b) 2x + 2y + 8
(c) 4x+ 4y + 8
(d) 4x + 4y + 16
422: Barkhan is a
(a) Crescent shaped sand-dune
(b) Depositional bar, separated by water from the coast
(c) Dark coloured, fine grained rock
(d) Glacial erosional feature
423: Which of the following fish are bred exclusively in the cold regions of India ?
I. Catla.
II. Tinca.
III. Bhekti.
IV. Trout.
Choose the correct answer from the codes given below.
Codes:
(a) I and lV
(b) I and IV
(c) II and IV
(d) III and IV
424: The Chairmen of public sector banks are selected by the
(a) Banks Board Bureau
(b) Reserve Bank of India
(c) Union Ministry of Finance
(d) Management of concerned bank
425: Who among the following invented Lasers?
(a) Theodore Maiman
(b) William Morton
(c) Francis Crick
(d) Denis Papin