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According to the archemedies principal that when an objectc emersion in any liquid its experiance bayuant force which is equl to the weight of water is displace by object

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Who invented clock?

Posted by Arpita _ ? 7 years, 5 months ago

CBSE > Class 09 > Science

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Soyab Idrishi 7 years, 5 months ago

Christiaan Huygens

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What is prokaryote cel

Posted by Prince Rajput 7 years, 5 months ago

CBSE > Class 09 > Science

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Yogita Ingle 7 years, 5 months ago

The cell having nuclear material without a nuclear membrane around it, are called prokaryotic cells. The organism made of prokaryotic cells are called prokaryotes.
1) The nucleus of prokaryotic cell is not well organised.
2) There is no nuclear membrane around the nuclear material in the prokaryotic cells.
3) The nuclear material is in direct contact with the cytoplasm.
4) All the prokaryotes are simple, unicellular organism.

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What is archeimedes principle

Posted by Namrata Singh 7 years, 5 months ago

CBSE > Class 09 > Science

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Yogita Ingle 7 years, 5 months ago

Archimedes’ Principle states that when an object is immersed fully or partially in a liquid, it experiences an upward force which is equal to the weight of liquid displaced by the object. When the weight of displaced liquid by an object is greater than the weight of object, the object will float in liquid and when the weight of liquid will be smaller than that of the weight of the object, the object will sink in liquid.

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Saumik Gupta 7 years, 5 months ago

Archeimedes principle means inertia

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What is the dental formula of age

Posted by Namrata Singh 7 years, 5 months ago

CBSE > Class 09 > Science

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Yogita Ingle 7 years, 5 months ago

Dental formula is the arrangement of different types of teeth in an oral cavity. Four types of teeth in a human jaw are Incisors, Canines, Premolars and Molars.
Dental formula of a human child is 212/212
Incisors emerge when the baby is 6 months old. Canines grow when the baby is 20 months old. First molars emerge out between the age of 13 to 19 months. Second molars emerge out at the age of 24 months. Premolars are not at all the baby teeth. They are said to be permanent teeth.
Human infant is the child whose age is below 12 months. So infants have only incisors in both the jaws.

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What is the exact location of enamel

Posted by Namrata Singh 7 years, 5 months ago

CBSE > Class 09 > Science

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What do you mean by health

Posted by Saumtha Srivastava 7 years, 5 months ago

CBSE > Class 09 > Science

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Miss Angel Barsha 7 years, 5 months ago

Health is a state of being physically, mentally and socially fit

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Namrata Singh 7 years, 5 months ago

Health is a state of being physical mentally fit and being in the absence if the any disease

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Saumik Gupta 7 years, 5 months ago

Healt means well from phsically mentaly and socially

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List the characteristic used for hierarchical classification ?

Posted by Rakhi Maurya 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 5 months ago

The three main characteristics used for a hierarchical classification are:
(i) Complexity of cell structure, i.e., type of cell—prokaryotic or eukaryotic. As a eukaryotic cell has membrane-bound organdIes including a nucleus, the cellular processes can be carried out efficiently in isolation from cells. On the other hand, the organisms without a clearly demarcated nucleus and other organelles need to have very different biochemical pathways. This would naturally have a great effect on every aspect of cell design. Moreover, the nucleated cells would have the capacity to participate in making a multicellular organism as they are capable of taking up specialised functions.
(ii) Body organisation, i.e., whether the organism is unicellular or multicellular. In a eukaryotic multicellular organism, cells that group together to form a single organism use the principle of division of labour. In this type of body design, all cells would not be identical. Rather, groups of cells will carry out specialised functions. Thus, this makes a very basic distinction in the body designs of organisms. As a result, an amoeba will be very different in its body design from a fish.
(iii) Mode of nutrition: ant otrophic or heterotrophic. Plants make their own food while animals depend on plants or other animals for their food. For this they will definitely have different body design.

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a planet moves arround the sun is nearly circular orbit it is the period of revolution T depends on radius (r) ,mass (m)of the sun and gravitational constant (G) find releation between them dimensionally

Posted by Sourabh Biswas 7 years, 5 months ago

CBSE > Class 09 > Science

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Why our Moon does not gets attracted by the Sun, though the mass of the Sun is much greater than the Earth ?

Posted by Vaishnavi Patil 7 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Akash Patel 7 years, 5 months ago

moon is smaller than sun when we see moon from earth the moon and sun are seen equal that is why we said that moon is smaller than sun

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Akhil Raj 7 years, 5 months ago

Moon is much closer to Earth than the Sun

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What does competent refer to in competent cells used in transformation experiments

Posted by Ayan Siddiqui 7 years, 5 months ago

CBSE > Class 09 > Science

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What is the work in lifting a body of mass 5kg vertically throgh 9 metre

Posted by Pratham Kumar 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Vicky Kumar 7 years, 5 months ago

Let g=10 M=5kg H= 9m W= mgh 5×10×9 = 450 j

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What is the value of g in gravitation

Posted by King Kumar 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Daivik Gautam 7 years, 5 months ago

9.8 m/s

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Q. Draw the structure of an atom of atomic number 1 to10 ?

Posted by Ankit Roushan 7 years, 5 months ago

CBSE > Class 09 > Science

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What are the types of classification

Posted by Riya Bhandari 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Adhnan K.N 7 years, 5 months ago

Here we have the types of classification algorithms in Machine Learning: Linear Classifiers: Logistic Regression, Naive Bayes Classifier. Support Vector Machines. Decision Trees. Boosted Trees. Random Forest. Neural Networks. Nearest Neighbor.

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Identify the cations from the following compounds NaCl

Posted by Riya Bhandari 7 years, 5 months ago

CBSE > Class 09 > Science

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A flowering plant whose embryo has single cotyledon,Give biological term and example

Posted by Mohamed Hassim 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Namrata Singh 7 years, 5 months ago

Monocot

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A person kicks a one-kg football to score a goal. When he kicks a one-kg brick, his foot gets hurt.Give a reason for it.

Posted by Akhil Raj 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Rutuja Sugave 7 years, 5 months ago

Because football is hollow as it contains air and brick is rigid ad it is made up of sand.

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Force and law of motion

Posted by Khushi Pal 7 years, 5 months ago

CBSE > Class 09 > Science

3 answers

Lakhwinder Singh 7 years, 5 months ago

Inertia is the inability of the body to stay in rest or motion untill a external forces are Not applied on it

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Akhil Raj 7 years, 5 months ago

The property by virtue of which an object tends to remain in the state of rest, or of uniform motion unless it is acted upon by some force is called inertia

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Khushi Pal 7 years, 5 months ago

What is inertia?

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Two objects each of 1.5kg, are moving in a same straight line but in opposite direction. The velocity of each object is2.5m/s before the collision during which they stick together. aWhat will be the velocity of combined object's after collision

Posted by Shiv Raj Kumar 7 years, 5 months ago

CBSE > Class 09 > Science