# National Standard Examination in Astronomy (NSEA) Solved Paper 2016 Part-15

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Q: 53. A piece of brass (an alloy of copper and zinc) weighs 12.9 g in air. When completely immersed in water, it weighs 11.3 g. What is the mass of copper contained in the alloy? The density of copper and zinc are 8.9 and 7.1 respectively.

(A)

(B)

(C)

(D)

Answer: (D)

Q: 54. The coefficients of x in the expansion of correspond to the

(A) 5^{th} row of Pascal’s triangle

(B) 6^{th} row of Pascal’s triangle

(C) 7^{th} row of Pascal’s triangle

(D) 4^{th} row of the Pascal’s triangle

Answer: (B)

Q: 55. Linked question (55-56): The adjacent figure shows a ramp (30°) holding a block of mass 50kg. The block attached to a movable pulley A with an inextensible massless string. The movable pulley is in turn held with the help of another fixed pulley B. The block kept on the ramp is to be raised through a vertical height of 10 cm. By what distance the string should be lowered down vertically, below E?

(A) 20 cm

(B) 5 cm

(C)

(D) cm

Answer: (C)

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