Types of cells - class-VII
Description: types of cells | |
Number of Questions: 39 | |
Created by: Divya Kade | |
Tags: physics electricity |
Three types of electric cells which provide current are:
Which one of the following solutions can be electrolysed ?
Which one of the following primary cells has e.m.f. $1.08 V$ and which remains fairly constant ?
To remove the polarisation defect in Daniel cell ?
In a cell, by convention, electron is taken to be flowing from
Which among the following is a standard cell ?
In daily life, dry cell is used in
When the ends of metal wire are not connected to a battery
Nickel Cadmium cells are used in
Button cell is also called as
When an electron moves from negative electrode to positive electrode
Which one works with the help of dry cell?
Out of the following the one which is a source of e.m.f is:
For a cell reaction involing a two-electron change, the standard e.m.f of the cell is fonud to be$0.295V$ at $25^{o}C$. The equilibrium constant of the reaction at $25^{o}C$ will be:
The electric cell is a device to obtain ?
An electrochemical cell stops working after some time because
A $100$ watt, $110$ volt lamp is connected in series with an electrolytic cell containing $CaSO _4$ solution, the weight of Cd deposited by the current for $10$ hrs is (Sl.wt. of Cd=112.4)
In an electric containing battery, the positive charge inside the battery.
The power supplied by a battery (or source) is maximum when the external resistance 'R' is equal to the
A cell of emf E is connected across a resistance r . The potential difference terminals of the cell is found to be V . The internal resistance of the cell must be
A cell drives a current of 1 A in to load of resistance $4W$. On doubling the load resistance. the current is found to be reduced by $40 \%$. The internal resistance of the cell is
The Zinc rod in leclanche cell is coated with a thin layer of mercury because
Primary cell are connected in parallel to
What is the e.m.f. of a dry cell ?
The depolariser used in Laclanche cell is
When the two terminals of a battery are connected directly with a wire then:
Electro chemical equivalent of substance is 0.0006735 ; its eq. wt. is :
In a cell, electrons move from
Which one of the following statement is not true for Daniel cell ?
Direction of electric current inside the cell is from
The common dry cell produces a voltage of
A battery converts chemical energy into
Which of the following is not the storage cell?
First electro chemical cell was designed by?
In which of the following cells polarisation is the major defect?
Which of the following effect of electric current is used in charging a battery of motor car?
A cell constructed by coupling a standard copper electrode and a standard magnesium electrode has emf of $2.7$ volts. If the standard reduction potential of copper electrode of $+0.34\ V$, that of magnesium electrode is