8th Grade > Physics
CHEMICAL EFFECTS OF ELECTRIC CURRENT MCQs
Total Questions : 59
| Page 4 of 6 pages
Answer: Option A. ->
magnetic needle deflects more in the case of sea water.
:
A
:
A
Sea water is more conducting compared to drinking water, as the former has more salts. So, more current flows through sea water than through drinking water. Hence, when tested with a tester, the magnetic deflection will be more in the case of sea water.
Answer: Option B. ->
Distilled water
:
B
Distilled water does not have any ions for the conduction of electricity, while salt water, tap water, and ORS drink have salts present in them which form ions in water and conduct electricity. Hence, distilled water is a bad conductor of electricity.
:
B
Distilled water does not have any ions for the conduction of electricity, while salt water, tap water, and ORS drink have salts present in them which form ions in water and conduct electricity. Hence, distilled water is a bad conductor of electricity.
Answer: Option B. ->
Deposition of metal on the electrodes.
:
B
:
B
When an electric current is passed through a solution, positive ions move towards the electrode which is connected to the negative terminal of the battery. The positive ions take electrons from the negative terminal and may get deposited at the electrode.
Answer: Option D. ->
Hydrogen gas will be formed at the electrode which is connected to the negative terminal of the battery
:
D
H+ ions move towards the electrode which is connected to the negative terminal of the battery, gain electrons and get released as H2 gas. 2H++2e−→H2
:
D
H+ ions move towards the electrode which is connected to the negative terminal of the battery, gain electrons and get released as H2 gas. 2H++2e−→H2
Answer: Option C. ->
Electrolysis
:
C
Electrolysis is the decomposition of an electrolyte when electricity is passed through it. It is a chemical change and results in the formation of new substances.
:
C
Electrolysis is the decomposition of an electrolyte when electricity is passed through it. It is a chemical change and results in the formation of new substances.
Answer: Option C. ->
Electrolysis
:
:
The process is known as electroplating. In this process, electrical energy is converted into chemical energy.
Answer: Option C. ->
Chemical energy into electrical energy
:
C
When a cell is connected in a closed circuit, chemical reactions occur inside the cell which results in the release of charge and this charge flows through the circuit as an electric current. Hence, a cell converts chemical energy into electrical energy.
:
C
When a cell is connected in a closed circuit, chemical reactions occur inside the cell which results in the release of charge and this charge flows through the circuit as an electric current. Hence, a cell converts chemical energy into electrical energy.
Answer: Option A. ->
True
:
A
Electric current, when passed through a salt solution through a specific apparatus, can create a chemical change. Such a process is called Electrolysis. Obtaining a chemical change with the use of electrical energy is known as Chemical Effect of Electricity.
:
A
Electric current, when passed through a salt solution through a specific apparatus, can create a chemical change. Such a process is called Electrolysis. Obtaining a chemical change with the use of electrical energy is known as Chemical Effect of Electricity.
Answer: Option A. ->
Sulphuric acid
:
B, C, and D
To be a good electric conductor, a material needs to have free electrons or ions.
Sulphuric acid has H+ and SO−4 ions.
H2O is pure water which does not have any salts and is a bad conductor of electricity.
Air and rubber are also bad conductors as they have no free electrons or ions.
:
B, C, and D
To be a good electric conductor, a material needs to have free electrons or ions.
Sulphuric acid has H+ and SO−4 ions.
H2O is pure water which does not have any salts and is a bad conductor of electricity.
Air and rubber are also bad conductors as they have no free electrons or ions.
Answer: Option B. ->
less
:
B
LED needs less electric current to glow compared to the normal bulb. LED does not need to burn filament to produce light. Hence, LED-based tester is better for testing conductivity of liquids (like salt solutions) with low electrical conductivity.
:
B
LED needs less electric current to glow compared to the normal bulb. LED does not need to burn filament to produce light. Hence, LED-based tester is better for testing conductivity of liquids (like salt solutions) with low electrical conductivity.
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