Conducting Liquid
Trending Questions
Paheli set up an experiment using liquid A in the beaker as shown in the figure. She observed that the bulb glows. Then she replaced the liquid A by another liquid B. This time the bulb did not glow. Boojho suggested replacing the bulb by an LED. They observed that the LED glows. Explain.
Q) Why should you not touch electrical appliances with wet hands?
A) This is because when we wash our hands with tap water which contains a lot of salt and ions this gets transmitted to our hands . When we touch the electrical appliances with wet hands , the electric current passes from the appliance till our hands due to which we may get electric shock.
Could you please check my answer. Do give your inputs.
- Lemon juice
- Vinegar
- Vegetable oil
- Sea water
Name three liquids, which when tested in the manner shown in Fig. 14.9, may cause the magnetic needle to deflect.
- copper sulphate
- copper carbonate
- sodium chloride
- lead carbonate
Name two liquids which conduct electricity and two liquids which do not conduct electricity.
All liquid conduct electricity.
- True
- False
Substances that allow electricity to flow through them easily are called __________
Which of the following liquids conduct electricity and which do not conduct electricity?
Lemon juice, Milk, Vinegar, Common salt solution, Sulphuric acid solution, Sugar solution, Distilled water, Honey, Sea water, Rainwater.
Name two electrical devices which produce heat as well as light.
Which of the following effects can occur on passage of electric current through a conducting solution?
Deposits of metal may be seen on electrodes
- Changes of colour of solutions may occur
Bubbles of a gas may be formed on the electrodes
All of the above
Which of the following does not conduct electricity ?
(a) Vinegar solution
(b) Sugar solution
(c) Lemon juice solution
(d) Caustic soda solution
A student staying in a coastal region tests the drinking water and also the sea water with a circuit in which a part of the connecting wire is wound around a matchbox containing compass. He finds that the compass needle deflects more in the case of sea water. Can you explain the reason ?
Question 1 (a)
Fill in the blanks.
Most liquids that conduct electricity are solutions of _____, ______ and _____.
_____ are the substances that allow the current to pass through them.
Electric current can flow through
Silver
iron
copper
all of these
- Electrolyte should have positive charge.
- Electrolyte should be able to conduct charge without dissociating.
- Electrolyte should have negative charge
- Electrolyte should be able to form positive and negative ions on passage of current.
When the free ends of a conductivity tester (made by using a battery connected to a wire wound around a compass) are dipped into a solution, the magnetic needle shows deflection. Can you give the reason for this deflection?
Why is it advised to cut off power supply and switch off all electrical appliances at the time of a flood?
Because impure water can conduct electricity.
Because water is a poor conductor of electricity.
Because it is important to save electricity.
None of these.
In an activity to check the conduction of electricity through two liquids labelled A and B by using a bulb, it is observed that the bulb glows brightly for liquid A while it glows very dimly for liquid B.
(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 liquids cannot be compared in this manner.
Do liquids also conduct electricity ?
Fill in the following blanks with suitable words :
(a) Most liquids that conduct electricity are solutions of ___, ___ and
(b) LED glows even when a ___ electric current passes through it.
(c) The passage of an electric current through a conducting solution causes ___ effect.
(d) When electric current is passed through acidified water, then ___ and ___ are formed.
(e) The process of depositing a layer of any desired metal on another metal by means of electricity is called ___
(f) If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the ___ terminal of the battery.
Electric current cannot flow through
silver
wood
copper
none of these
The decomposition of an electrolyte when electricity is passed through is is called ________.
A sugar solution is a better conductor of electricity when compared to a salt solution.
True
False
You are provided with a magnetic compass, an empty matchbox, 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.
State whether the following statements are true or false :
(a) Rainwater is a non-conductor of electricity.
(b) A piece of fresh potato does not conduct electricity at all.
________ allow the electric current to flow through them.
Substances through which electricity cannot flow is ____.
