Please select a subject first
Advertisements
Advertisements
Identify heteroatom (s) in the following compound.
\[\begin{array}{cc}
\ce{CH3CH2 - C - CH3}\\\
\phantom{....}||\
\ce\\\phantom{....}{O}\end{array}\]
Concept: undefined >> undefined
Identify heteroatom (s) in the following compound.
\[\ce{CH3CH2Cl}\]
Concept: undefined >> undefined
Advertisements
A farmer wants to grow banana plants genetically similar enough to the plants already available in his field. Which one of the following methods would you suggest for this purpose?
Concept: undefined >> undefined
The plants that can be raised by the method of vegetative propagation are ______.
Concept: undefined >> undefined
Write the IUPAC name of the following:
\[\begin{array}{cc}
\ce{CH3}\phantom{...}\ce{CH3}\phantom{.......}\\
|\phantom{.......}|\phantom{.........}\\
\ce{CH2 - CH - CH2}\\
\phantom{...........}|\\
\phantom{......................}\ce{CH2}\ce{CH2}\ce{CH3}
\end{array}\]
Concept: undefined >> undefined
Why does the cord of an electric heater not glow while the heating element does?
Concept: undefined >> undefined
Compute the heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V.
Concept: undefined >> undefined
An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.
Concept: undefined >> undefined
An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.
Concept: undefined >> undefined
Why is the tungsten used almost exclusively for filament of electric lamps?
Concept: undefined >> undefined
Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?
Concept: undefined >> undefined
How does the resistance of a wire vary with its area of cross-section?
Concept: undefined >> undefined
Write Joule's law of heating.
Concept: undefined >> undefined
An electric heater is connected to the 230 V mains supply. A current of 8 A flows through the heater.
- How much charge flows around the circuit each second?
- How much energy is transferred to the heater each second?
Concept: undefined >> undefined
An electric heater is connected to the 230 V mains supply. A current of 8 A flows through the heater.
(b) How much energy is transferred to the heater each second?
Concept: undefined >> undefined
Which gases are exchanged in your lungs?
Concept: undefined >> undefined
An electric room heater draws a current of 2.4 A from the 120 V supply line. What current will this room heater draw when connected to 240 V supply line?
Concept: undefined >> undefined
What is nichrome? State its one use.
Concept: undefined >> undefined
Give two reasons why nichrome alloy is used for making the heating elements of electrical appliances.
Concept: undefined >> undefined
Why are the coils of electric irons and electric toasters made of an alloy rather than a pure metal?
Concept: undefined >> undefined
