In which of the following process heat is released?
Condensation is conversion of gaseous state to liquid state, so heat is given out in this process.
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Choose the correct answer from the following. The conversion of ice into water is an example of _____. (1) melting (2) freezing (3) condensation (4) sublimation.
Answer: (1) melting The conversion of ice into water is an example of melting. If you took out the ice cubes... View Article
According to principle of calorimetry
Heat lost by hot body is equal to the heat gained by cold body
When 1 coulomb of charge flows through any cross section of a conductor in 1 second, then
When 1 coulomb of charge flows through any cross section of a conductor in 1 second, then 1 Ampere of... View Article
The SI unit of current is:
The SI unit of electric current is Ampere. It is denoted as A. One ampere is defined as the rate of... View Article
Water is used in hot water bags for which purpose?
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What is the SI unit of specific heat capacity ?
Answer: Specific heat capacity is the quantity of heat needed to raise the temperature per unit mass. The definition of specific heat... View Article
A current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes. The amount of electric charge that flows through the circuit is:
Answer: Given parameters Current (I) = 0.5 A Time (t) = 10 minutes Time in minutes can be converted into... View Article
Electric current will stop flowing when the potential difference is
Electric current will stop flowing when potential difference is zero. It means two ends are at same potential.
How much energy is transferred when 10 A current flows through a resistor of 5 ohm for 30 minutes?
Given that Current flowing through resistors= 10A Resistance of resistors= 5Ω Time taken to flow the current = 30 mins=... View Article
According to indian philosophers, all materials are made up of how many elements?
There are 5 elements
Choose the right answer from the following
The system _____ energy while going from solid to the liquid state. releases absorbs absorbs and releases transforms Answer: 2. absorbs... View Article
What is Latent Heat?
The heat required to change the state of a substance without any change in temperature is known as latent heat.... View Article
Magnetic lines of force originate from the
Magnetic lines of force always originate from the North Pole and end at its the South Pole. Magnetic lines of... View Article
In which direction does a freely suspended compass needle align itself?
A freely suspended compass needle will align itself approximately in North-South direction.
Potential difference is measured using a _______
The instrument used to measure potential difference is Voltmeter.
Electric current always flows from ______ to _______
Electric current always flows from higher to lower potential. Explanation The flow of electrons is termed electron current. Electrons flow... View Article
The quantity which is denoted by joule/coulomb is
V = W/Q = J/C Thus, potential difference is the quantity which is denoted by joule/coulomb.
Name the Coolant used in Car Radiators
Internal combustion engines are often cooled by circulating a liquid known as engine coolant. The coolant in a typical automobile... View Article
The temperature at which water vapourises into steam is called
The temperature at which water vaporizes into steam is called a boiling point. When the water reaches its boiling point,... View Article
