Question 1 :
Water obtained from which of the following sources is a good conductor of electricity?
Question 5 :
A coating of zinc is deposited on iron to protect it from __________.
Question 7 :
Charging a body by simply touching it is called ........ .
Question 8 :
Tin cans used for storing food, are made by electroplating tin onto :
Question 9 :
Chromium plating is done to make the object scratch proof and appear shiny.
Question 11 :
Which of the following gas is formed at the electrode connected to the negative terminal of the battery?
Question 12 :
The process of depositing thin layer of a metal over an another metal with a help of electric current is called :
Question 15 :
The electrical process of coating an inexpensive conductor with a metal is called electroplating.
Question 16 :
Electroplating is a very useful process widely used in industry for coating metal objects with a thin layer of :
Question 18 :
When copper rod donates electrons to hydrogen ions, it gains ______ charge.
Question 20 :
The passage of an electric current through a conducting solution causes :
Question 21 :
What will happen if our eyes are exposed to very dim light?<br>
Question 22 :
Which of the following statements is correct regarding rods and cones in the human eye?<br>
Question 25 :
Which of the following is a correct way by which we can take care of our eyes?
Question 28 :
The splitting of white light into several colours on passing through a glass prism is due to -
Question 33 :
The least distance of distinct vision for a young adult with normal vision is about:<br>
Question 34 :
There is a pattern observed in the number of sum spots appearing every year called as
Question 35 :
If an object is placed symmetrically between two plane mirrors inclined at an angle of $72^{\circ}$, then the total number of images formed is:<br/>
Question 37 :
The changing of focal length of an eye-lens to focus the image of an object at varying distances is done by the action of the :