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Meghna Thapar 5 years, 7 months ago
The phenomenon of persistence or prolongation of audible sound after the source has stopped emitting it is called reverberation. In an auditorium or big hall excessive reverberation is highly undesirable. To reduce reverberation, the roof and walls of the auditorium are generally covered with sound-absorbent materials like compressed fibreboard, rough plaster or draperies.
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Yogita Ingle 5 years, 8 months ago
| Isobars | Isotopes |
| Chemicals elements which have the same mass | Different atomic structure of the same element |
| The atomic masses are equal | The atomic masses are different |
| Often the physical properties are similar |
Usually, physical properties are different |
| Atomic numbers are different | Atomic numbers are the same |
| Chemical elements are different | same chemical elements but in different forms |
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Meghna Thapar 5 years, 7 months ago
Different types of soils are found in different parts of India. In some parts there is clayey soil, in some parts there is loamy soil while in some other parts there is sandy soil. Soil is affected by wind, rainfall, temperature, light and humidity.
Some of the important crops and the types of soils which are suitable for growing these crops are given below:
- Clayey soil and loamy soil are both suitable for growing cereals like wheat, and gram. Such soils are good at retaining water. The best soil for growing wheat crops is loamy soil as it is rich in humus and very fertile.
- Soil rich in clay and organic matter and having good capacity to retain water is ideal for growing paddy.
- Loamy soil is good for growing lentils and other pulses.
- Sandy-loam soil drains water easily and could hold plenty of air in which is suitable for growing cotton crops.
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Yogita Ingle 5 years, 8 months ago
Laws of constant proportion
The law states that in a chemical substances the elements are always present in a definite proportion by mass. It is also termed as law of definite proportion.
For instance, the ratio of hydrogen and oxygen in water obtained from any source is 1:8 i.e. 1g of hydrogen and 8g of oxygen together make up 9g of water.
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Meghna Thapar 5 years, 7 months ago
Milk production depends, to some extent, on the duration of the lactation period which means the period of milk production after the birth of a calf.
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Yogita Ingle 5 years, 8 months ago
An animal is said to have bilateral symmetry if it has two equal but opposite right and left halves when cut lengthwise in the middle vertical plane, e.g., frog. On the other hand, an animal is said to have radial symmetry, if it is symmetrical with respect to any plane passing through its longitudinal axis. In other words, any plane passing longitudinally through any diameter divides the body into equal halves, e.g., Hydra.
Posted by Nitin Kumar 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Yes, sound follows the same laws of reflection as that of light because,
(i) Angle of incidence of sound is always equal to that of angle of reflection of sound waves.
(ii) The direction in which sound is incident, the direction in which it is reflected and normal all lie in the same plane.
Vedant Shrivastava 5 years, 8 months ago
Posted by Nitin Kumar 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Following are the important function of the ear:
Hearing: The mechanism of hearing involves the following steps:
- The sound waves pass through the auditory canal and reach the eardrum.
- The vibrations produced pass through the tympanic membrane to the tympanic cavity.
- The ear ossicles in the tympanic cavity receive the vibrations and the stapes pushes the oval window in and out.
- This action is passed on to the organ of corti, the receptor of hearing, that contains tiny hair cells that translate the vibrations into electrical impulse that are transmitted to the brain by sensory nerves.
Balance: The eustachian tube and the vestibular complex are the important parts of the ear responsible for balance.
- The eustachian tube equalizes the air pressure in the middle ear and maintains the balance.
- The vestibular complex contains receptors that maintain body balance.
Posted by Nitin Kumar 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Nocturnal animals are more active at night than during the day. These animals sleep during the day, often in a burrow or den. Many animals, like desert animals, are nocturnal in order to escape extreme daytime heat.
Posted by Ækhumpui Debbarma 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
The forces of attraction between the particles of a gas are minimum, intermediate in case of a liquid and are maximum in a solid. Hence, in case of oxygen ‘forces of attraction’ are minimum since it is a gas. In case of water being a liquid ‘forces of attraction’ are intermediate. In case of sugar, ‘forces of attraction’ are greater since it is solid.
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Yogita Ingle 5 years, 8 months ago
Fractional distillation is the method used for the separation of a mixture containing two miscible liquids differing in boiling points by means of distillation using a fractionating column.
In case the difference in the boiling points of the liquids is less than 25K temperature, we use the fractional distillation method.
The apparatus is almost the same as used in distillation. The only difference is that a fractioning column is fitted in between the distillation flask and the condenser. A simple fractioning column is made up of a tube packed with glass beads. The beads provide the surface for the vapours to cool and condense again and again. The fractioning columns obstruct the smooth upward flow of vapours.
Example: A mixture of n-hexane and n-heptane can be separated through the process of fractional distillation.
Put the mixture into a distillation flask. Heat the mixture. The vapours of, n-hexane has a lower boiling point pass through and get condensed in the condenser. n-heptane, which has a higher boiling point, condenses and flows back into the distillation flask.
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Meghna Thapar 5 years, 7 months ago
Genetics is a branch of biology concerned with the study of genes, genetic variation, and heredity in organisms.
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Yogita Ingle 5 years, 8 months ago
Oscillatory motion is defined as the to and fro motion of an object from its mean position. The ideal condition is that the object can be in oscillatory motion forever in the absence of friction but in the real world, this is not possible and the object has to settle into equilibrium.
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