National Standard Examination in Astronomy (NSEA) Solved Paper 2016 Part-17

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Q: 59. A fish is swimming in still water. At a given instant there is a bird flying vertically above the fish. For the bird, the fish appears to be 15 m below the surface of water while for the fish the bird appears to be 20 m above the surface. Refractive index of water is 4/3. Actual distance between the bird and the fish is

(A)

(B)

(C)

(D)

Answer: (A)

Q: 60. The smallest integer n such that

(A) 2499

(B) 2500

(C) 2501

(D) 2502

Answer: (B)

Q: 61. A uniform wire of resistance per unit length 1 is bent in the form of an equilateral triangle. If effective resistance between adjacent vertices is 2.4 Ω, length of each side of the triangle is

(A) 1.8 m

(B) 2.4 m

(C) 3.6 m

(D) 7.2 m

Answer: (C)

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