Advertisements
Advertisements
Give an account of some important viral diseases of human beings.
Concept: undefined >> undefined
Write short notes on
(a) Tuberculosis;
(b) Polio.
Concept: undefined >> undefined
Advertisements
Explain rain water harvesting.
Concept: undefined >> undefined
Name the scientist who discovered electron.
Concept: undefined >> undefined
Which subatomic particle was discovered by : Thomson?
Concept: undefined >> undefined
Name the principle on which a soundboard works.
Concept: undefined >> undefined
What is the shape of a soundboard kept behind the speaker on the stage of a big hall ?
Concept: undefined >> undefined
Name two sound absorbing materials (or objects) which can make our big room less echoey.
Concept: undefined >> undefined
(a) Describe Thomson's model of the atom. Which subatomic particle was not present in Thomson's model of the atom?
Concept: undefined >> undefined
What is a megaphone ? Name the principle on which a megaphone works.
Concept: undefined >> undefined
What is a bulb horn ? Name the principle on which a bulb horn works.
Concept: undefined >> undefined
What is a stethoscope ? Name the principle on which a stethoscope works.
Concept: undefined >> undefined
What is a soundboard ? Explain the working of a soundboard with the help of a labelled diagram.
Concept: undefined >> undefined
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
Concept: undefined >> undefined
The first model of an atom was given by :
Concept: undefined >> undefined
How many atoms are present in one gram atomic mass of a substance ?
Concept: undefined >> undefined
Define gram atomic mass of a substance. How much is the gram atomic mass of oxygen ?
Concept: undefined >> undefined
Define atomic mass of an element.
Concept: undefined >> undefined
