Please select a subject first
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What is meant by a chemical formula ? Write the formulae of one element and one compound.
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Explain the difference between 2N and N2.
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What do the following abbreviations stand for ?
- O
- 2O
- O2
- 3O2
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What do the symbols, H2, S and O4 mean in the formula H2SO4 ?
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What is the difference between 2H and H2 ?
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What is the significance of the formula of a substance ?
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Name the three characteristics of sound.
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Name the unit used to measure the loudness of sound. Also write its symbol.
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Name the characteristic which helps us distinguish between a man's voice and a woman's voice, even without seeing them.
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How does the pitch of a sound depend on frequency ?
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Name the characteristic of sound which depends on (a) amplitude (b) frequency, and (c) waveform.
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Name the characteristic of sound which can distinguish between the 'notes' (musical sounds) played on a flute and a sitar (both the notes having the same pitch and loudness).
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What type of scans are used these days to monitor the growth of developing baby in the uterus of the mother ?
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How is an ultrasound scan for fetus (unborn baby) better than X-ray ?
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What is the name of the device which is used to find the depth of sea (or ocean) by using ultrasonic sound waves ?
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What happens to the pitch of a sound if its frequency increases ?
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What happens to the loudness of a sound if its amplitude decreases ?
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What name is given to sound waves of frequencies higher than 20 kHz ?
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Fill in the blank with suitable word :
Pitch of sound depends on ....................
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