# National Standard Examination in Physics (NSEP) Solved Paper 2016 Part-18

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Q; 63. A uiform spherical charge distribution of radius R produces electric fields at two points at distances respectively from the centre of the distribution. Out of the following the possible expression/s for is/are

(A)

(B)

(C)

(D)

Answer: (CD)

Q: 64. A metallic wire of length ℓ is held between two supports under some tension. The wire is cooled through θ° . Let Y be the Young’s modulus, ρ the density and α the thermal coefficient of linear expansion of the material of the wire. Therefore, the frequency of oscillations of the wire varies as

(A)

(B)

(C)

(D)

Answer: (ABCD)

Q: 65. Water is flowing through a vertical tube with varying cross section as shown. The rate of flow is Given that speed of flow and area of cross section Which of the following is/are true?

(A)

(B)

(C)

(D)

Answer: (BC)

Q: 66. A simple laboratory power supply consists of a transformer, bridge rectifier and a filter capacitor drives a suitable load. If due to some reason one of the diodes in the rectifier circuit becomes open then

(A) Output voltage of power supply falls to zero

(B) Output voltage of power supply decreases to some nonzero value

(C) ac ripple in the output increasses

(D) Ripple frequency decreases

Answer: (BC)

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