What is sound board? Explain with the help of well labelled diagram.
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December 2022
Vibha has visited an island as holiday tour with her family. She narrated all her journey to her friends. She told that she saw amazing world inside ocean which had various organisms and plants. She saw some organisms which had tentacles and are orange and purple in colour. By all...
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December 2022
What happens to the gravitational force when the distance between two particles is (i) doubled , (ii) halved?
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December 2022
Preventive and control measures adopted for storage of grains include - a. Strict cleaning b. fumigation c. proper disjoining d. all of them.
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December 2022
(a) What are antibodies? (b) How do antibodies work? (c) How is penicillin effective in controlling bacterial diseases?
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December 2022
A sound wave has frequency of 4 KHz and wavelength of 50 cm. It takes 5s to travel. Calculate the distance it travels.
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December 2022
When clouds cool down, water droplets fall to the land as rain, hail or snow. Name the phenomenon.
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December 2022
The technique used to obtain a variety with high yield and other desirable characters is - a. selection b. hybridisation c. introduction d. both a and c.
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December 2022
A. Write formulae of:- a. Magnesium hydroxide b. Potassium chloride c. Sodium carbonate B. Define atomic mass unit
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December 2022
Write the causes, symptoms and the methods of prevention and control of diarrhoea.
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December 2022
What are major divisions of plantae? What is the basis of these divisions?
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December 2022
A. An object of mass 10 kg is dropped from a height of 15m. Find its kinetic energy when it is half way down. B. When is the work done by a body said to be negative?
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December 2022
Flower bearing plants are known as a. angiosperms b. gymnosperms c. bryophytes d. algae
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December 2022
A feather and a coin are thrown from a height. The coin reaches the earth faster than the feather. But in vacuum they fall at the same rate. Explain
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December 2022
1. What should be the angle between the force applied and displacement to get maximum work?