# National Standard Examination in Astronomy (NSEA) Solved Paper 2016 Part-7

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Q: 18. Which of the following statements are true about periodic functions defined on the set of real numbers?

A : Sum of two functions with finite period is always a periodic function with finite period

B: The period of a function that is sum of two periodic functions with finite period is least common multiple of the period of two functions

(A) A and B are correct

(B) A is correct but B is incorrect

(C) A is false but B is correct

(D) A and B are false

Answer: (D)

Q: 19 Unaware about the fact that analog ammeters and voltmeters can also have zero error, a student recorded following readings while determining resistance by using Ohm’s law

Obs. No. | Voltage / V | Current / mA |

1 | 1.0 | 40 |

2 | 3.0 | 80 |

3 | 5.0 | 120 |

4 | 7.0 | 160 |

5 | 9.0 | 200 |

If the ammeter has no zero error, the zero error in the voltmeter is.

(A) -1V

(B) -1.5 V

(C) 0.5 V

(D) 1V

Answer: (A)

Q: 20 The inverse function of the function sin X + cos X is

(A)

(B)

(C)

(D)

Answer: (D)

Q: 21. Particle A collides elastically (Perfect) with particle B which was at rest. They disperse in opposite directions with same speeds. Ratio of their masses must respectively be

(A)

(B)

(C)

(D)

Answer: (B)

For detailed explanations and answers visit - NSEA Answers with detailed explanations