Question= What is resistance.
Answer= The resistance of a conductor is said to be 1 ohm if a current of 1 ampere flows through it when the potential difference across it is 1 volt.

What is resistance.

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Question= What is barometer.
Answer= Barometer is an instrument which is used to measure the atmospheric pressure.
There are three types of barometer are commonly used.
{1} Simple barometer.
{2} Fortin's barometer.
{3} Aneroid barometer.

What is barometer.

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Question= What is Speed.
Answer= The speed of a body is the rate of change of distance with time. Numerically it is the distance travelled by the body in 1 s.

What is Speed.

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Question= What is Primary cells ? 

Answer= These are the cells which provide current as a result of irreversible chemical reaction. These cells are discarded after use when the entire chemical energy in them has converted into electrical energy. Thus these cells are 'use and throw ' type of cells and cannot be recharged. Depending upon the material of electrodes, we have different of primary cells e.g. simple voltaic cell, Leclanche cell, Daniel cell, dry cell, etc.

What is Primary cells ?

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Question= What is Temperature.
Answer= Temperature is a quantity which tells the thermal state of a body ( i.e., the degree of hotness or coldness of the body.) It determines the direction of flow of heat when two bodies at different temperature are placed in contact.

What is Temperature. +Harsh Puri Goswami 

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Question= What is Heat.
Answer= Heat is a form of energy which flows. It is the energy of random motion of molecules constituing the body.

What is Heat. +Harsh Puri Goswami 

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Question= What is meant by estimation of physical quantities by its order of magnitude. give one example.
Answer= The order of magnitude of physical quantity is its magnitude in power of ten when that physical quantity is expressed in power of ten digit to the left of decimal.

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Question= What is unit.

Answer= Unit is the quantity of a constant magnitude which is used to measure the magnitude of other quantities of the same nature.

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Question= What is measurement.
Answer= Measurement is the process of comparison of the given physical quantity with the known standard of the same nature.

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