Science - Chemical Effects of Electric Current
Exam Duration: 45 Mins Total Questions : 30
In electrolytic solutions, which of the following acts as carrier of charge?
- (a)
Protons
- (b)
Electron
- (c)
Neutrons
- (d)
Ions
What are insulators?
- (a)
Materials that conduct electricity
- (b)
Materials that do not conduct electricity
- (c)
Materials that conduct electricity only at low temperature
- (d)
Materials that conduct electricity at room temperature
Which of the following is an insulator?
- (a)
Wood
- (b)
Iron
- (c)
Graphite
- (d)
Silver
Which of the following circuits gives the correct way of connecting an LED to light it up?
- (a)
- (b)
- (c)
- (d)
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
Which acid is present in lemon juice that acts as an electrolyte?
- (a)
Sulphuric acid
- (b)
Nitric acid
- (c)
Hydrochloric acid
- (d)
Citric acid
Which of the following is the electrolyte in a dry cell?
- (a)
Copper sulphate
- (b)
Zinc sulphate
- (c)
Sulphuric acid
- (d)
Ammonium chloride
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
What is the common voltage produced by a dry cell?
- (a)
1.5 V
- (b)
30 V
- (c)
60V
- (d)
3 V
What happens when electric current is made to flow through a conductor?
- (a)
Some amount of electrical energy is converted into heat energy
- (b)
Some amount of electrical energy is converted into mechanical energy.
- (c)
Some amount of mechanical energy is converted into electrical energy.
- (d)
Some amount of heat energy is converted into electrical energy.
Nichrome is an alloy. Which of the following metals make up this alloy
- (a)
Nickel and chromium
- (b)
Nitrogen and chromium
- (c)
Nitrogen, chlorine and chromium
- (d)
Nickel, chromium and manganese
What is the splitting of a compound using electricity called?
- (a)
Electrolysis
- (b)
Electrolyte
- (c)
Electrokinesis
- (d)
Electrochemistry
What is the principle involved in the glowing of an electric bulb?
- (a)
Magnetic effect of current
- (b)
Heating effect of current
- (c)
Chemical effect
- (d)
Conduction of current
Why are LED'sextensively used to replace bulbs?
(i) Consume less electricity
(ii) Have longer life
(iii) Have more power
- (a)
Only (i) and (ii)
- (b)
Only (ii) and (iii)
- (c)
Only (i) and (iii)
- (d)
(i), (ii) and (iii)
Which of the following is the best conductor of electricity?
- (a)
Tap water
- (b)
Distilled water
- (c)
Sea water
- (d)
Rain water
Which of the following effects of current is responsible for the deflection of a compass needle in an electric field?
- (a)
Heating effect of current
- (b)
Magnetic effect of current
- (c)
Conducting effect of heat
- (d)
Chemical effect of current
Which of the following liquids is a bad conductor of electricity?
- (a)
Lemon juice
- (b)
Vinegar
- (c)
Sea water
- (d)
Distilled water
Cans used for storing food are electroplated. What is the material used for electroplating?
- (a)
Chrome onto tin
- (b)
Iron onto tin
- (c)
Tin onto iron
- (d)
Chrome onto iron
What is iron coated with in order to protect it from corrosion and rust?
- (a)
Tin
- (b)
Copper
- (c)
Zinc
- (d)
Mercury
Which of the following statements is correct?
- (a)
Distilled water is a good conductor of electricity
- (b)
An LED glows even when a weak electric current flows through it.
- (c)
Only hydrated salt solutions conduct electricity.
- (d)
Zinc plating is done to make the object scratch proof.
'X' is a good conductor of electricity. Which of the following could be 'X'?
- (a)
Solid sodium chloride
- (b)
Vinegar
- (c)
Distilled water
- (d)
Liquid oxygen
In a cell, by convention, from where does the charge seem to be flowing through?
- (a)
From positive electrode to negative electrode
- (b)
From negative electrode to positive electrode
- (c)
Both (A) and (B)
- (d)
Cannot be said
Why are metals good conductors of electricity?
- (a)
In metals, outer electrons are strongly bound to the atom
- (b)
In metals, outer electrons are loosely bound to the atom
- (c)
In metals, inner electrons are loosely bound to the atom
- (d)
In metals, protons can detach from the nucleus and conduct electricity
During the electrolysis of CuSO4 solution, sulphate ions move towards the
- (a)
copper electrode.
- (b)
anode.
- (c)
cathode.
- (d)
zinc electrode
A bulb does not glow when the probes are hanging in air. Why?
- (a)
Air absorbs electricity
- (b)
Air is a bad conductor of electricity
- (c)
Electricity is discharged into air.
- (d)
Air disperses electricity.
Iron vessels are coated with tin to
- (a)
give better shining
- (b)
increase the strength
- (c)
increase weight.
- (d)
prevent rusting.
Observe the given figure
What is the purpose of this experimental setup?
- (a)
To check the conductivity of copper sulphate solution.
- (b)
To get iron electroplated.
- (c)
To check the continuity of charge flow in the circuit.
- (d)
To make the electric bulb glow
What is the process of depositing a layer of a desired metal on another material by passing electric current called?
- (a)
Electrolysis
- (b)
Electroplating
- (c)
Chromium plating
- (d)
Galvanising
Which of the following statements is NOT correct?
- (a)
The ions are free to move about in an electrolyte.
- (b)
The solution which can form ions is used for electroplating
- (c)
Acids are bad conductors of electricity
- (d)
An electric bulb glows due to the heating effect of current.
The charges present on the various objects are shown below in the figure. In which of the following cases does a force of repulsion act between them?
- (a)
- (b)
- (c)
- (d)