Chemical Effects of Electric Current Important Question Answer
We are taught about the chemical effects of electric current under Science. Information related to the chemical effects of electric current is also asked in examinations. If you are preparing for Science examination. Then it is very important for you to know about the chemical effects of electric current. Today in this post you have been given questions and their answers on the chemical effects of electric current. Which have been asked earlier in Class 8th Science examination, so read them carefully.
1.Plastic is a
(a) good conductor
(b) poor conductor
(c) semiconductor
(d) none of the above.
Answer: Poor conductor.
2.Tap water is
(a) good conductor
(b) poor conductor
(c) semiconductor
(d) none of the above.
Answer: Good conductor.
3.Which of the following is not a conductor?
(a) Iron
(b) Copper
(c) Wood
(d) Graphite.
Answer: Wood.
4.The source of electric current in an artificial satellite is
(a) dry cell
(b) solar battery
(c) storage battery
(d) dynamo.
Answer: Solar battery.
5.Which of the following is not an insulator?
(a) Rubber
(b) Plastic
(c) Wood
(d) Copper.
Answer: Copper.
6.The full form of LED is
(a) Light Emitting Diode
(b) Low Electron Density
(c) Elongated Electron Drawing
(d) None of the above.
Answer: Light Emitting Diode.
7.Which of the following is a poor conductor?
(a) Distilled water
(b) Saline water
(c) Dilute hydrochloric acid water
(d) Potassium iodide water.
Answer: Distilled water.
8.The effect observed when electric current flows through an electrolyte solution is
(a) magnetic effect
(b) thermal effect
(c) chemical effect
(d) no effect.
Answer: Chemical effect.
9.Which process is used to protect iron from rusting?
(a) Electroplating
(b) Metallurgy
(c) Electrolytic refining
(d) None of the above.
Answer: Electroplating.
10.The electroplating process is based on which effect of electric current?
(a) Magnetic effect
(b) Chemical effect
(c) Thermal effect
(d) None of the above.
Answer: Chemical effect.
Question 1: Is the human body an electrical conductor or an electrical insulator?
Answer: Electrical conductor.
Question 2: What are electrical conductors?
Answer: Electrical conductors are substances that allow electric current to flow through them. Examples include silver, copper, aluminum, iron, and the human body.
Question 3: What are electrical insulators?
Answer: Electrical insulators are substances that do not allow electric current to flow through them. Examples include wood, plastic, rubber, silk, etc.
Question 4: Does every liquid conduct electricity?
Answer: No.
Question 5: What is an LED?
Answer: LED stands for Light Emitting Diode.
Question 6: Name the phenomenon in which a chemical substance is decomposed by electric current.
Answer: Electrolysis.
Question 7: What is produced by the electrolysis of acidic water?
Answer: Hydrogen and oxygen.
Question 8: Which effect of electric current is applied in electroplating?
Answer: Chemical effect.
Question 9: Which effect of electric current helps in lighting a bulb?
Answer: Thermal effect.
Question 10: How can weak and small electric currents be detected?
Answer: By using an LED.
Question 11: Name the various effects of electric current.
Answer: Thermal, chemical, and magnetic effects.
Question 12: Is air an electrical insulator?
Answer: Yes.
Question 13: Name the electrical conducting liquids.
Answer: Lemon juice, vinegar, lime water, tap water.
Question 14: Can electrical conductors be classified as non-conductors under special conditions?
Answer: Yes.
Question 15: Which liquids are electrical conductors?
Answer: Solutions of acids, bases, and salts.
Question 16: What are electrodes?
Answer: Metal rods suitable for connecting a battery in an electrically conducting liquid are called electrodes.
Question 17: By which process can an expensive or cheap metal be coated with gold?
Answer: Electroplating.
Question 18: Air is not a good electrical conductor. Demonstrate with an experiment.
Answer: Air is an insulator: Take a bulb and connect it to a cell and switch. When you press the switch, the bulb lights up. But when the switch is removed, the bulb does not light because there is air between the switch contacts. This shows that air is not a good electrical conductor.
Question 19: What is electrolysis?
Answer: Electrolysis is a process in which chemical compounds are decomposed by the flow of electric current. When electric current passes through acidic water, it splits into hydrogen and oxygen. Oxygen collects at the anode and hydrogen at the cathode.
Question 20: What is electroplating?
Answer: Electroplating is an electrolysis process in which a thin layer of expensive metal (such as gold, zinc, silver) is coated on cheap metal to protect it from corrosion.
In this post you have been given important questions and their answers related to class 8 science chapter 14 question answer chemical effects of electric current, important questions for class 8 science chapter 14 chemical effects of electric current class 8 question answer chemical effects of electric current class 8 notes. If you find it useful then share it with your friends. If you have any question or suggestion regarding this then definitely ask by commenting below.