## Railways General Knowledge Test 179

Instructions

For the following questions answer them individually

Q 1

An incident ray strikes a plane mirror at an angle of $$20^\circ$$ with the mirror. The angle between the incident ray and reflected ray is ............

Q 2

Give an example of a salt which gives an aqueous solution of pH less than 7.

Q 3

Which of the following_ statements is true?

Q 4

In which year did Ole Romer measure the speed of light for the first time in the history?

Q 5

When a glass is rubbed by a silken cloth, the rod acquires