What is current?
Current is the flow of charge.
In electrolytic solutions, which of the following acts as carrier of charge?
In electrolytic solutions, electrolyte splits into positive and negative ions. The charge is moved through ions.
What are insulators?
Insulators are substances that do not conduct electricity.
Which of the following is an insulator?
Wood is an insulator while iron, graphite and silver are good conductors of electricity.
Which of the following circuits gives the correct way of connecting an LED to light it up?
An LED has two leads. One lead is slightly longer than the other. The longer lead is always connected to a positive terminal of the battery while the shorter lead is always connected to a negative terminal of the battery. In circuit (B) switch is present and is in its ON position. Only this makes the LED glow.
Which of the following energy conversions takes place in a cell?
In a cell, chemical energy is converted into electrical energy.
Which of the following are the characteristics of an electrolyte?
The characteristic of an electrolyte is that it should be able to form positive and negative ions.
Which acid is present in lemon juice that acts as an electrolyte?
Citric acid is present in the lemon juice which acts as an electrolyte.
Which of the following is the electrolyte in a dry cell?
The electrolyte in a dry cell is ammonium chloride.
In a dry cell, which of the following acts as the positive terminal?
In a dry cell, metal cap on the carbon rod acts as a positive terminal.
What is the common voltage produced by a dry cell?
The common dry cell produces a voltage of 1.5 V
What happens when electric current is made to flow through a conductor?
When electric current flows through a conductor, some amount of electrical energy is converted into heat energy.
Nichrome is an alloy. Which of the following metals make up this alloy?
Nichrome is an alloy of nickel and chromium.
What is the splitting of a compound using electricity called?
Electrolysis is the splitting of a compound using electricity.
What is the principle involved in the glowing of an electric bulb?
Due to the heating effect of current, the filament of the bulb gets heated to a high temperature and it starts glowing.
Why are LEDs extensively used to replace bulbs?
(i) Consume less electricity
(ii) Have longer life
(iii) Have more power
LEDs are extensively used to replace bulbs because they consume less electricity, have longer life and have more power.
Which of the following is the best conductor of electricity?
Sea water is saline and so, it is a good conductor of electricity.
Which of the following effects of current is responsible for the deflection of a compass needle in an electric field?
Magnetic effect of current is responsible for the deflection of a compass needle in an electric field.
Which of these is the industrial applications of the chemical effects of electric current?
Electroplating is the most common industrial application of chemical effects of electric current as are galvanizing and anodizing.
Which of the following liquids is a bad conductor of electricity?
Distilled water or pure water is a bad conductor of electricity.