Please select a subject first
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Explain various modes of transmission of infectious diseases.
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Differentiate between carrier and vector.
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Write short note on organ-specific and tissue-specific manifestations of disease.
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State whether the following statement is true or false :
Thomson proposed that the nucleus of an atom contains protons and neutrons.
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Which part of an atom was discovered by Rutherford's alpha particle scattering experiment?
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Give the evidence for the existence of nucleus in an atom.
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What important information is furnished about the nucleus of an atom by the alpha particle scattering experiment of Rutherford?
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How was it shown that an atom has a lot of empty space within it?
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What name is given to the repetition of sound caused by the reflection of sound waves ?
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What name is given to the persistence of sound in a big hall or auditorium ?
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(a) What is the nucleus of an atom and what is the nature of charge on it?
(b) Name the scientist who discovered the nucleus of atom.
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Name the particles used by Rutherford in his experiment on the discovery of nucleus. Also state the charge on these particles.
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Name the device used by doctors to listen to our heartbeats.
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What is reverberation ? What will happen if the reverberation time in a big hall is too long ?
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How can reverberations in a big hall or auditorium be reduced ?
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Describe the Rutherford's model of an atom. State one drawback of Rutherford's model of the atom.
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Rutherford's alpha particle scattering experiment led to the discovery of :
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What is a molecule ? Explain with an example.
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Consider the following sound waves marked A, B, C and D.
(a) Which two waves represent sounds of the same loudness but different pitch ?
(b) Which two waves represent sounds of the same frequency but different loudness ?
(c) State whether all these sound waves have been produced by the same vibrating body or different vibrating bodies ?
(d) Which vibrating body/bodies could have generated the sound waves shown here ?
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In hydrogen peroxide (H2O2), the proportion of hydrogen and oxygen by mass is :
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