In each of the following questions, four words have been given, out of which three are alike in some manner and the fourth one is different. 

Choose out the odd one and mark it on answer-sheet as directed. 

1. 

(1) Venus 

(2) Moon 

(3) Saturn 

(4) Silver 

2. 

(1) Iron 

(2) Silver 

(3) Mercury 

(4) Zinc 

3. 

(1) Infrared rays

(2) Ultraviolet rays 

(3) Radio waves 

(4) X-rays 

4. 

(1) Man-Earth 

(2) Birds- Sky 

(3) Fish-Water 

(4) Train-Station 

5. 

(1) Mother 

(2) Father 

(3) Brother 

(4) Teacher