Class 8th Science Chapter – 11 Chemical Effects of Electric Current
| Textbook | NCERT |
| Class | 8th |
| Subject | Science |
| Chapter | 11th |
| Chapter Name | Chemical Effects of Electric Current |
| Category | Class 8th Science |
| Medium | English |
| Source | Last Doubt |
| What is unit voltage?, What is unit of power?, What is resistor unit?, What is the symbol of current?, What is equal to 1 volt?, What is ohm’s law unit?, Is resistor AC or DC?, What is the value of 1 ohm?, What is 1000 volts called?, How many volts is 1m?, What is 120 volt?, What is called current?, What is Q in physics?, What is Q in electricity?, Is ohm a SI unit? |
Class 8th Science Chapter – 11 Chemical Effects of Electric Current
Chapter – 11
Chemical Effects of Electric Current
MCQ
| (1) Waste from an electroplating factory must be disposed off ? A. in the nearby river B. in the nearby pond C. in the nearby cornfield D. according to the disposal guidelines of Waste Management Bodies Answer – (D) according to the disposal guidelines of Waste Management Bodies |
| (2) Copper is ? A. a good conductor B. an insulator C. both A. and B. D. none of these Answer – (A) a good conductor |
| (3) Electroplating is based on ? A. heating effect of electricity B. chemical effect of electricity C. physical effect of electricity D. magnetic effect of electricity Answer – (B) chemical effect of electricity |
| (4) Polythene is ? A. a conductor B. an insulator C. both A. and B. D. none of these Answer – (B) an insulator |
| (5) Which of the following is a good conductor ? A. Brick B. Steel C. Plastic D. Cotton Answer – (B) Steel |
| (6) Electroplating prevents ? A. corrosion B. passing of current C. dissociation D. shining Answer – (A) corrosion |
| (7) An electric lamp glows due to ? A. heating effect B. magnetic effect C. chemical effect D. physical effect Answer – (A) heating effect |
| (8) Which is not a non-electrolyte ? A. Ethyl alcohol B. Sodium chloride C. Urea D. Sodium solution Answer – (B) Sodium chloride |
| (9) Flow of electron is called ? A. electrolyte B. electroplating C. electrodes D. electric current Answer – (D) electric current |
| (10) An electrolyte is ? A. a metal B. a liquid that conducts current C. a non-metal D. none of these Answer – (B) a liquid that conducts current |
| (11) When electrodes are immersed in water and electricity passed, the bubbles formed on the positive terminal is actually _ gas ? A. Hydrogen B. Carbon dioxide C. Oxygen D. Nitrogen Answer – (C) Oxygen |
| (12) Tap water is a good conductor of electricity while distilled water is not because ? A. Tap water contain salts B. Distilled water do not contain salt C. Only A. is B. correct D. Both A. & B. is correct Answer – (B) Distilled water do not contain salt |
| (13) In LEDs, the longer lead (wire) is always connected to the _ terminal ? A. negative B. neutral C. positive D. Any terminal Answer – (C) positive |
| (14) Iron objects can be protected by electroplating them with ? A. chromium B. nickel C. zinc D. all of these Answer – (D) all of these |
| (15) Which of the following is not used for electroplating metal articles ? A. Nickel B. Silver C. Chromium D. Sodium Answer – (D) Sodium |
| (16) The process of depositing a layer of any desired metal on another material by means of electricity is called _ ? A. Electric plating B. Electroplating C. Electric depositing D. None of the above Answer – (B) Electroplating |
| (17) Chromium plating is done on many objects such as car parts, bath taps, kitchen gas stove etc. Why ? A. It does not corrode but prevents scratches B. It looks beautiful C. It costs less D. Articles can be sold at higher price Answer – (A) It does not corrode but prevents scratches |
| (18) A coating of _________is deposited on iron to protect it from corrosion and formation of rust ? A. copper B. aluminium C. Zinc D. silver Answer – (C) Zinc |
| (19) Why do we add little dilute sulphuric acid to copper sulphate solution during electroplating ? A. To increase acidity B. To increase conductivity C. So that the colour becomes more prominent D. To burn copper sulphate Answer – (B) To increase conductivity |
| (20) When electrodes are immersed in water and electricity passed, the bubbles formed on the negative terminal is actually _ gas ? A. Hydrogen B. Carbon dioxide C. Oxygen D. Nitrogen Answer – (A) Hydrogen |
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