Hypermetropia can be corrected by using:
- AConcave lens.
- ✓Convex lens.
- CConcave mirror.
- DConcavo $-$ convex lens.
Answer: B.
View full solution →Question types
Chemical Effects of Electric Current question types
407 questions across 10 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
407
Questions
10
Question groups
5
Question types
01
M.C.Q. [I MARKS]
222 Q→02Give the definition [1 M]
8 Q→03Fill in the blanks: [1 M]
26 Q→04questions in short. [2 marks ]
31 Q→05scientific reasons[2 marks ]
9 Q→06true or false. [1 M]
22 Q→07questions in short. [3 marks ]
32 Q→08questions in details [4 marks ]
12 Q→09questions in on sentence. [1 M]
42 Q→10case /data -based (4 Marks)
3 Q→Sample Questions
Chemical Effects of Electric Current questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Which of the following is correct?
- AWater can be used for extinguishing fires caused due to electrical faults.
- BCarbon is a non$-$metal so it cannot be used in electrolytic cell.
- ✓A liquid conducts electricity because of the presence of ions.
- DPure water forms ions to conduct electricity.
Answer: C.
View full solution →Which gas is produced at anode when current passes through acidified water?
- AHydrogen.
- ✓Oxygen.
- CNitrogen.
- DFluorine.
Answer: B.
View full solution →Which of the following is not an application of the chemical effect of electric current?
- AElectroplating of metals.
- BPurification of metals.
- ✓Decomposition of elements.
- DDecomposition of compounds.
Answer: C.
View full solution →Which of the following are the characteristics of an electrolyte?
- AIt has a positive charge.
- BIt has a negative charge.
- CIt conducts charge without dissociating.
- ✓It forms positive and negative ions.
Answer: D.
View full solution →Poor Conductors or Insulators
LED
Good Conductors
Electroplating
Electrode
Fill in the following blanks with suitable words:Most liquids that conduct electricity are solutions of $............, ............$ and $............$
View full solution →Fill in the following blanks with suitable words: The process of depositing a layer of any desired metal on another metal by means of electricity is called $............$
View full solution →Fill in the following blanks with suitable words: If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the $............$ terminal of the battery.
View full solution →Fill in the following blanks with suitable words: The passage of an electric current through a conducting solution causes $............$ effect.
View full solution →An electrolyte is a $............$
View full solution →Name three liquids, which when tested in the manner shown in Fig. $14.9,$ may cause the magnetic needle to deflect.
View full solution →$LED$ is used in a circuit. Explain why.
View full solution →Give one example of the chemical effect of electric current.
Which properties of chromium metal make it suitable for electroplating it on car bumpers, bath taps and bicycle handlebars, etc., made of iron?
Name the effect of current responsible for the glow of the bulb in an electric circuit.
It is dangerous to touch the electrical switch with wet hands or while standing on a wet floor without slippers.
Electroplating factories dispose their conducting solution and polluting waste far away from residential area.
Iron girders used in the bridges are coated with zinc.
Tin cans, used for storing food, are made by electroplating tin onto iron.
Chromium plating is done on many objects used in daily life like bath taps, kitchen gas burners, etc.
Electroplating wastes are useful to human health and environment.
Jewellery makers electroplate silver and gold on expensive metals.
Chromium has a shiny appearance.
Some liquids are good conductors of electricity and some are poor conductors of electricity.
Electric current produces a magnetic effect.
Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain.
A child staying in a coastal region tests the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you explain the reason?
In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this.
When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason?
The process that you saw in Activity $14.7$ is used for purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transferred to the thin copper plate. Which electrode should be attached to the positive terminal of the battery and why?
View full solution → In the circuit given as Figure, Boojho observed that copper is deposited on the electrode connected to the negative terminal of the battery. Paheli tried to repeat the same experiment. But she could find only one copper plate. Therefore she took a carbon rod as negative electrode. Will copper be still deposited on the carbon rod? Explain your answer.
Name three liquids which when tested in the manner shown in figure given alongside may cause the magnetic needle of compass to deflect.
Show the passing of current through the water with an activity.
Yor are provided with a magnetic compass, an empty match box, a battery of two cells and connecting wires. Using these objects how will you make a tester for testing an electric circuit? Draw the necessary circuit diagram and explain.
The bulb does not glow in the setup shown in Fig. $14.10$. List the possible reasons. Explain your answer. 
View full solution → Does pure water conduct electricity? If not, what can we do to make it conducting?
$A$ tester is used to check the conduction of electricity through two liquids, labelled $A$ and $B$. It is found that the bulb of the tester glows brightly for liquid $A$ while it glows very dimly for liquid $B$. You would conclude that.
$i.$ liquid $A$ is a better conductor than liquid $B$.
$ii.$ liquid $B$ is a better conductor than liquid $A$.
$iii.$ both liquids are equally conducting.
$iv.$ conducting properties of liquid cannot be compared in this manner.
View full solution →$i.$ liquid $A$ is a better conductor than liquid $B$.
$ii.$ liquid $B$ is a better conductor than liquid $A$.
$iii.$ both liquids are equally conducting.
$iv.$ conducting properties of liquid cannot be compared in this manner.
Fill in the blanks. The process of depositing a layer of any desired metal on another material by means of electricity is called _________.
Fill in the blanks. If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the __________ terminal of the battery.
Fill in the blanks. The passage of an electric current through a solution causes _________ effects.
Electroplating is the process of adding a surface layer of metal on another metal.
$7.$ Which of these is true about electroplating?
Circle ‘Yes’ or ‘No’ for the correct response.
$8.$ Which of these is an example of electroplating?
$A.$ Colouring of jeans
$B.$ Painting of a wall
$C.$ Lamination of a photograph
$D.$ Gold plating of imitation jewelleries
$9. $ Sumit replaced all the bulbs in his home with $LEDs.$
After a month, he noticed that the electricity bill had decreased.
What was the most likely reason for the decrease in electricity bill?
$10.$ Distilled water is a bad conductor of electricity.
Why does rainwater conduct electricity?
View full solution →$7.$ Which of these is true about electroplating?
Circle ‘Yes’ or ‘No’ for the correct response.
| Is the statement true? | Yes or No |
| The solution used contains ions of two metals. | Yes/No |
| Metal gets deposited on the electrode connected to the negative terminal. | Yes/No |
| A non-metal is used as the electrode connected to the positive terminal. | Yes/No |
$A.$ Colouring of jeans
$B.$ Painting of a wall
$C.$ Lamination of a photograph
$D.$ Gold plating of imitation jewelleries
$9. $ Sumit replaced all the bulbs in his home with $LEDs.$
After a month, he noticed that the electricity bill had decreased.
What was the most likely reason for the decrease in electricity bill?
$10.$ Distilled water is a bad conductor of electricity.
Why does rainwater conduct electricity?
Rashmi made separate electric circuits with four different solutions.
The pictures show what she found.
$4.$ What can be concluded from her activity$?$
$A. LED$ glows only in solutions
$B.$ All four solutions are insulators of electricity
$C.$ All four solutions are good conductors of electricity
$D.$ Acids and bases are good conductors of electricity
$5.$ Which safety precaution must Rashmi follow while doing this activity$?$
$A.$ Wear boots
$B.$ Wear goggles
$C.$ Wear headphones
$D.$ Wear rubber gloves
$6.$ Will an electric device work if we place the positive terminal of a battery towards the negative point of the device? Explain your answer.
View full solution →The pictures show what she found.
$4.$ What can be concluded from her activity$?$
$A. LED$ glows only in solutions
$B.$ All four solutions are insulators of electricity
$C.$ All four solutions are good conductors of electricity
$D.$ Acids and bases are good conductors of electricity
$5.$ Which safety precaution must Rashmi follow while doing this activity$?$
$A.$ Wear boots
$B.$ Wear goggles
$C.$ Wear headphones
$D.$ Wear rubber gloves
$6.$ Will an electric device work if we place the positive terminal of a battery towards the negative point of the device? Explain your answer.
Tia used four different objects to ill the gap in an electric circuit, separately.
The table shows what she found.
$1.$ Which of these best conducts electricity$?$
$A.$ Wood
$B.$ Plastic
$C.$ Copper
$D.$ Graphite
$2$. Which of these is a chemical effect of electric current$?$
$A.$ Glowing of bulb
$B.$ Heating of water
$C.$ Ringing of mobile phone
$D.$ Chromium plating on iron
$3.$ Which of these is a correct pair of an insulator and a conductor$?$
View full solution →The table shows what she found.
$1.$ Which of these best conducts electricity$?$
$A.$ Wood
$B.$ Plastic
$C.$ Copper
$D.$ Graphite
$2$. Which of these is a chemical effect of electric current$?$
$A.$ Glowing of bulb
$B.$ Heating of water
$C.$ Ringing of mobile phone
$D.$ Chromium plating on iron
$3.$ Which of these is a correct pair of an insulator and a conductor$?$
| Insulator | Conductor | |
| $A.$ | Aluminium | Cotton |
| $B.$ | Thermocol | Rubber |
| $C.$ | Copper | Iron |
| $D.$ | Wax | Aluminium |
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