Q 1 – Which of the following is a bad conductor of electricity?
(a) Distilled water
(b) Silver nitrate
(c) Sulphuric acid
(d) Copper sulphate
Q 2 – The negative charged ions are called:
(a) cations
(b) anions
(c) ions
(d) none of these
Q 3 – An electric current can produce
(a) heating effect
(b) chemical effect
(c) magnetic effect
(d) all of these
Q 4 – An electric lamp glows due to
(a) Chemical effect
(b) Magnetic effect
(c) Heating effect
(d) None
Q 5 – Kerosene is:
(a) electrolyte
(b) non-electrolyte
(c) electrode
(d) none of these
Q 6 – Which of the following does not conduct electricity?
(a) Sugar solution
(b) Vinegar solution
(c) Lemon juice solution
(d) Caustic soda solution
Q 7 – Pure or distilled water is a
(a) poor conductor
(b) good conductor
(c) both (a) and (b)
(d) none of these
Q 8 – Which of the following is a good conductor?
(a) Brick
(b) Steel
(c) Plastic
(d) Cotton
Q 9 – Potential difference is created in a electric circuit due to
(a) Switch
(b) Cell or battery
(c) Voltmeter
(d) Conductor
Q 10 – Magnetic compass connected In a circuit is used to check:
(a) magnetism in electric current
(b) slow current
(c) small current
(d) none of these
Q 11 – Polythene is
(a) a conductor
(b) an insulator
(c) both (a) and (b)
(d) none of these
Q 12 – In electrolytic solutions, which of the following acts as carrier of charge?
(a) Protons
(b) Electrons
(c) Neutrons
(d) Ions
Q 13 – Electroplating is based on
(a) heating effect of electricity
(b) chemical effect of electricity
(c) physical effect of electricity
(d) magnetic effect of electricity
Q 14 – Fuse wire is used in electric circuit to prevent
(a) Electrical appliances and circuit from high current
(b) Prevent the insulator
(c) Us from electric shock
(d) Prevent the ammeter
Q 15 – Copper is
(a) a good conductor
(b) an insulator
(c) both (a) and (b)
(d) none of these
Q 16 – LED glows:
(a) when a strong electric current flows through it
(b) whenever a weak electric current flows through it
(c) when no electric current flows through it
(d) none of these
Q 17 – 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
Q 18 – Which of the appliances at your home does not run on electric current?
(a) Television
(b) Mixer grinder
(c) Air conditioner
(d) Gas burner
Q 19 – An electrolyte is
(a) a metal
(b) a liquid that conducts current
(c) a non-metal
(d) none of these
Q 20 – When current flows through a conducting solution than the electrode connected to the
negative terminal of the battery is called :
(a) anode
(b) cathode
(c) rod
(d) none of these
Q 21 – The passage of an electric current through a solution causes
(a) Heating effect
(b) Lighting effect
(c) Chemical effect
(d) All of these
Q 22 – Flow of electron is called
(a) electrolyte
(b) electroplating
(c) electrodes
(d) electric current
Q 23 – In a dry cell, which of the following acts as the positive terminal?
(a) Carbon rod
(b) Manganese dioxide
(c) Manganese dioxide and powdered carbon
(d) A metal cap on the carbon rod
Q 24 – Which is not a non-electrolyte?
(a) Ethyl alcohol
(b) Sodium chloride
(c) Urea
(d) Sodium solution
Q 25 – Which of the following is a good conductor of electricity:
(a) istilled water
(b) tap water
(c) kerosene
(d) none of these
Q 26 – What is current?
(a) The flow of matter
(b) The flow of electrons
(c) The flow of protons
(d) The flow of charge
Q 27 – Cathode is the electrode connected to the negative terminal of the battery.
(a) anode
(b) cathode
(c) rod
(d) none of these
Q 28 – Electric current is measured by a device
(a) Odometer
(b) Voltmeter
(c) Ammeter
(d) Galvanometer
Q 29 – Electroplating prevents
(a) corrosion
(b) passing of current
(c) dissociation
(d) shining
Q 30 – When electric current is passed through the copper sulphate solution, copper sulphate
dissociates into:
(a) copper and sulphur
(b) copper and oxygen
(c) copper and sulphate
(d) none of these
Q 31 – In battery two or more cells are connected in
(a) Series
(b) Random
(c) Positive and positive terminals
(d) Parallel
Q 32 – Which of the following is not used for electroplating metal articles?
(a) Nickel
(b) Silver
(c) Chromium
(d) Sodium‘
Q 33 – Car parts, bath taps, kitchen gas burners, bicycle handlebars arc electroplated with:
(a) chromium
(b) zinc
(c) tin
(d) none of these
Q 34 – Which acid is present in lemon juice that acts as an electrolyte?
(a) Sulphuric acid
(b) Nitric acid
(c) Hydrochloric acid
(d) Citric acid
Q 35 – Iron objects can be protected by electroplating them with
(a) chromium
(b) nickel
(c) zinc
(d) all of these
Q 36 – Which metal is electroplated on iron for making “cans” for storing food and drinks?
(a) Chromium metal
(b) Silver metal
(c) Tin metal
(d) Copper metal
Q 37 – In LEDs, the longer lead (wire) is always connected to the _______ terminal
(a) negative
(b) neutral
(c) positive
(d) Any terminal
Q 38 – Which of the following are the characteristics of an electrolyte?
(a) It has a positive charge.
(b) It has a negative charge.
(c) It conducts charge without dissociating.
(d) It forms positive and negative ions.
Q 39 – Tin cans, used for storing food, are made by electroplating tin onto iron. Why?
(a) Tin gives a shiny appearance
(b) To make the vessel cheap
(c) Tin is less reactive than iron.
(d) To make the vessel lighter
Q 40 – It is found that the bulb of the tester glows brightly for liquid. A white it glows very dimly for liquid H. You would conclude that:
(a) liquid A is a better conductor than liquid B
(b) liquid B is a better conductor than liquid A
(c) both liquids are equally conducting
(d) conducting properties of liquid cannot be compared in this manner
Q 41 – Tap water is a good conductor of electricity while distilled water is not becaus
(a) Tap water contain salts
(b) Distilled water do not contain salt
(c) Only (a) is correct
(d) Both (a) & (b) is correct
Q 42 – What is the common name for manganese-dioxide-alkaline-zinc cell?
(a) Moz cell
(b) Long life cell
(c) Manganese-dioxide
(d) Alkaline cell
Q 43 – 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
Q 44 – Which of the fallowing liquid is poor conductor:
(a) salty water
(b) orange juice
(c) lemon juice
(d) none of these
Q 45 – Which of the following is an insulator?
(a) Wood
(b) Iron
(c) Graphite
(d) Silver
Q 46 – 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
Q 47 – In electric circuit, current flows due to
(a) Difference in temperature
(b) Same potential difference
(c) Difference in potential difference
(d) Difference in current
Q 48 – If a switch has some sparking, we will switch it off with the help of:
(a) an iron nail
(b) cotton cloth
(c) wooden stick
(d) any of (b) and (c)
Q 49 – 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
Q 50 – Which one of the following is the insulator:
(a) human body
(b) paper
(c) acid
(d) steel
Q 51 – A coating of _________is deposited on iron to protect it from corrosion and formation of rust
(a) copper
(b) aluminium
(c) Zinc
(d) silver
Q 52 – 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
Q 53 – 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
Q 54 – Some liquids are good conductors of electricity and some are poor conductors. Which one is a poor conductor?
(a) Acidic solution
(b) Alkaline solution
(c) Common Salt solution
(d) Distilled water
Q 55 – Tin cans, used for storing food, are made by electroplating tin onto iron. Why?
(a) Tin gives a shiny appearance
(b) To make the vessel cheap
(c) Tin is less reactive than iron.
(d) To make the vessel lighter
Q 56 – Match the Column-A with Column-B:
| Column-A | Column-B |
| (a) Copper allows electric current to pass through it easily | (i) copper |
| (b) Adding some salt in distilled water makes it | (ii) because they are insulators |
| (c) Plastics are used to make handles of electric appliances | (iii) a conductor |
| (d) It is used to make electric wires | (iv) a conductor |
| Column-A | Column-B |
| (a) Copper allows electric current to pass through it easily | (iv) a conductor |
| (b) Adding some salt in distilled water makes it | (iii) a conductor |
| (c) Plastics are used to make handles of electric appliances | (ii) because they are insulators |
| (d) It is used to make electric wires | (i) copper |
Q 57 – Match the items given in column I suitably with those given in column II.
| Column I | Column II |
| 1. Closed path | (a) Good conductor |
| 2. LED | (b) Deflection of compass |
| 3. Carbon rod | (c) Positively charged ion |
| 4. Galvanisation | (d) Poor conductor of electricity |
| 5. Distilled water | (e) Coating with zinc |
| 6. Salt solution | (f) Electrodes |
| 7. Cation | (g) Light emitting diodes |
| 8. Magnetic effect of current | (h) Electric circuit |
| 9. Chromium | (i) Negatively charged ion |
| 10. Anion | (j) Electroplating |
| Column I | Column II |
| 1. Closed path | (h) Electric circuit |
| 2. LED | (g) Light emitting diodes |
| 3. Carbon rod | (f) Electrodes |
| 4. Galvanisation | (e) Coating with zinc |
| 5. Distilled water | (d) Poor conductor of electricity |
| 6. Salt solution | (a) Good conductor |
| 7. Cation | (c) Positively charged ion |
| 8. Magnetic effect of current | (b) Deflection of compass |
| 9. Chromium | (j) Electroplating |
| 10. Anion | (i) Negatively charged ion |
Q 58 – Fill in the blanks with suitable word/s.
1. Substances that conduct electricity are called ___________.
2. Substances that do not conduct electricity are called ___________.
3. A cation has ___________ charge.
4. Some liquids are ___________ conductors of electricity and some are ___________ conductors of electricity.
5. Distilled water is an ___________.
6. Distilled water when mixed with salts becomes a ___________ conductor of electricity.
7. Light emitting diodes (LED) glow even when a ___________ electric current flows through it.
8. The passage of an electric current through a conducting solution causes ___________.
9. Change in colour is an example of the ___________ effect of current.
10. There are ___________ wires attached to an LED.
11. In an LED, the longer lead is attached to the ___________ terminal of the battery and the shorter lead to the ___________ terminal.
12. Chromium has a ___________ appearance.
13. Distilled water is made by removing all ___________.
14. Iron tends to ___________ and ___________.
15. A coating of ___________ is deposited on iron to protect it from corrosion and formation of rust.
16. An electric lamp glows due to ___________ effect of electric current.
17. Electrodes are ___________.
18. The deflection in ___________ shows that current is passing.
19. ___________does not corrode easily.
20. An electrolyte is a ___________.