Questions
Question 1 Multiple Choice (Single Answer)
Iron has great strength and it is used to make bridges and automobiles. The negative part is that it tends to corrode easily and rust. To prevent this, iron is coated with ______________.
- copper
- lead
- zinc
- mercury
- arsenic
Question 2 Multiple Choice (Single Answer)
Which of the following is a poor conductor of electricity?
- Lemon juice
- Caustic soda
- Dilute hydrochloric acid
- Potassium iodide
- Distilled water
Question 3 Multiple Choice (Single Answer)
In a departmental store, cans made of iron are used for storing food items. To prevent reaction of food with iron and to enable it to be stored better the iron cans are coated with ______________.
- copper
- mercury
- lead
- cadmium
- tin
Question 4 Multiple Choice (Single Answer)
The process of depositing a layer of any desired metal or material by means of electricity is called ___________.
- magnetic effect of electric current
- electrocution
- electroplating
- heating effect of electric current
- corrosion
Question 5 Multiple Choice (Single Answer)
Which of the following statements is not true?
- Common salt makes pure water a better conductor.
- When current is passed through electrodes immersed in water, oxygen bubbles are formed at the positive terminal and hydrogen bubbles at the negative terminal.
- Distilled water is a good conductor of electricity.
- Rain water is a good conductor of electricity as small amounts of mineral salts are naturally present in it.
- Lemon juice makes pure water a better conductor.