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Ask QuestionPosted by Lakshmi Lakshmi 5 years, 1 month ago
- 2 answers
Meghna Thapar 5 years, 1 month ago
Some stars are closer to the Earth than others. Why is it that some stars appear to have color while other simply appear to be white? The color receptors in our eyes are not sensitive enough to detect color in fainter stars and as a result only the brightest stars in the sky appear to have color. It seems that the stars with 'cooler' temperatures have energy that is radiated in the red tones of the electromagnetic color spectrum, while those with 'hotter' temperatures had energy that is radiated in the blue and white tones of the electromagnetic color spectrum.
Posted by Avinash Kumar 5 years, 1 month ago
- 2 answers
Meghna Thapar 5 years, 1 month ago
Air is nothing but a mixture of a variety of gasses. The air in the atmosphere consists of nitrogen, oxygen, which is the life-sustaining substance for animals and humans, carbon dioxide, water vapour and small amounts of other elements (argon, neon, etc.). Air is the general name for the mixture of gases that makes up the Earth's atmosphere. This gas is primarily nitrogen (78%), mixed with oxygen (21%), water vapor (variable), argon (0.9%), carbon dioxide (0.04%), and trace gases.
Posted by Ravi Jatav 5 years, 1 month ago
- 4 answers
Madhusmita Sahu 5 years, 1 month ago
Suzanne Smitha 5 years, 1 month ago
Yogita Ingle 5 years, 1 month ago
- The length of the (Strait) shortest path between the initial and the final positions of a body is known as displacement.
- It is a vector quantity.
- Displacement can be 0, positive and negative
Posted by Madhav Manroa 5 years, 1 month ago
- 1 answers
Yogita Ingle 5 years, 1 month ago
The term "retradation" means negative acceleration.
Initial velocity =10m/s
Final velocity =0m/s
Time Taken=20s
Acceleration =0-10/20
Acceleration = -0.5m/s sq
Retardation =0.5m/s sq
Posted by Sara Khan 5 years, 1 month ago
- 3 answers
Kajal Sharma 5 years, 1 month ago
Gaurav Seth 5 years, 1 month ago
A n s w e r :
Average velocity would be equal to average speed when the total distance travelled equals the net displacement of a particle. This happens when a particle moves along a straight line in a fixed direction.
Yogita Ingle 5 years, 1 month ago
Speed is a scalar quantity having only magnitude and no direction while velocity is a vector quantity having magnitude and direction both.
The magnitude of average velocity of an object equal to its average speed when the motion of the object will be straight and unidirectional.
As, speed is scalar quantity and velocity is a vector quantity, so the object is required to move in straight line with same or constant direction.
Posted by Jaskaran Singh 5 years, 1 month ago
- 1 answers
Meghna Thapar 5 years, 1 month ago
All metals and some other elements, such as carbon, do not have a simple structure but consist of a very large and indefinite number of atoms bonded together. Their atomicity cannot be determined and is usually considered as Metals donot exist as simple metals, a large and indefinite number of atoms are joined together to form a three dimensional structure. Thus metals are polyatomic. Hence, there atomicity cannot be determined.
Posted by Arvind Kumar Shah 5 years, 1 month ago
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Madhav Manroa 5 years, 1 month ago
Posted by Adeeba Hashmi 5 years, 1 month ago
- 2 answers
Pankaj Gautam 5 years, 1 month ago
Rohit Kumar 5 years, 1 month ago
Posted by Ayush Ranjan 5 years, 1 month ago
- 3 answers
Zunaid Md 5 years, 1 month ago
Sujeet Yadav 5 years, 1 month ago
Posted by Shani Baiswade 5 years, 1 month ago
- 3 answers
Akshat Holland Minettee 5 years, 1 month ago
Yogita Ingle 5 years, 1 month ago
Compound is a pure substance made up of two or more elements combined chemically in a definite ratio.
Characteristics:
1. The properties of compound differ from those of its constituents.
2. Compound has fixed melting point and boiling point.
3. Compound is a homogeneous substance.
4. Constituent elements can be separated by chemical process.
Posted by Bajendar Kumar 5 years, 1 month ago
- 2 answers
Posted by Arihant Jain 5 years, 1 month ago
- 4 answers
Madhav Manroa 5 years, 1 month ago
Akshat Holland Minettee 5 years, 1 month ago
Rohit Kumar 5 years, 1 month ago
Yogita Ingle 5 years, 1 month ago
Acceleration
- Acceleration: It is a measure of the change in the velocity of an object per unit time.
- Acceleration can be caused either by change in direction of motion or change in speed or both.
Acceleration = Change in velocity/Time taken
- SI unit is ms-2.
- It is a vector quantity; the acceleration is taken to be positive if it is in the direction of velocity and negative when it is opposite to the direction of velocity.
Posted by Priyanshi Kumarisingh 5 years, 1 month ago
- 5 answers
Akshat Holland Minettee 5 years, 1 month ago
Bhagyesh Kame 5 years, 1 month ago
Posted by 조진 우 5 years, 1 month ago
- 2 answers
Bhagyesh Kame 5 years, 1 month ago
Yogita Ingle 5 years, 1 month ago
When the passenger in a train moving with a constant speed tosses a coin, the coin will fall back to the spot where it was tossed from as if the train was stationary. Because the coin is also moving with constant speed along with the train
Posted by Krisna Divedi 5 years, 1 month ago
- 2 answers
Yogita Ingle 5 years, 1 month ago
Movement of any object from one position to another position with respect to the observer is called as Motion.
When an object moves along a straight line, the motion of the object is called rectilinear motion. For example; motion of a car on highway
Posted by Jiya Pasare 5 years, 1 month ago
- 1 answers
Gaurav Seth 5 years, 1 month ago
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Chloroplasts are oval, spherical, disc-shaped or ribbon-shaped.
- They are 5-10 mm in length and 2-4 mm in width.
- It is a double-membraned organelle.
- The space enclosed by the inner membrane is filled with a semi-solid substance called stroma
- Flattened, membranous sacks called thylakoids are present in the stroma.
- The stroma contains several enzymes required for protein and carbohydrate synthesis, DNA, ribosomes and RNA.
- The thylakoids are arranged like stacks of coins. These stacks are called grana.
- Flat membranous tubules called stroma lamellae connect the thylakoids.
- The thylakoids contain space within them called a lumen.
Posted by Sourav Sandhu 5 years, 1 month ago
- 1 answers
Posted by Harleen Kaur 5 years, 1 month ago
- 3 answers
Bhagyesh Kame 5 years, 1 month ago
Yogita Ingle 5 years, 1 month ago
The process by which the cell engulfs some of its extracellular fluid (ECF) including material dissolved or suspended in it, is known as endocytosis.The flexibility of the cell membrane enables the cell to engulf by invaginating and pinching off, forming a membrane-bounded vesicle called an endosome.
Amoeba acquires its food by endocytosis.
Suzanne Smitha 5 years, 1 month ago
Posted by Harleen Kaur 5 years, 1 month ago
- 4 answers
Gaurav Seth 5 years, 1 month ago
(i) Nucleus has double layer covering called nuclear membrane which has pores that allows the transfer of materials from inside the nucleus to its outside.
(ii) It directs the chemical activities of the cell.
(iii) It determines the way, the cell will develop and the form it will exhibit at maturity.
(iv) It plays an important role in cell division.
(v) It plays a central role in cellular reproduction.
(vi) Nucleus has chromosomes which contains information for the inheritance of features from parents to next generation.
Suzanne Smitha 5 years, 1 month ago
Suzanne Smitha 5 years, 1 month ago
Posted by Naziya Ppns 5 years, 1 month ago
- 5 answers
Harleen Kaur 5 years, 1 month ago
Gaurav Seth 5 years, 1 month ago
Given,
Velocity = 72 km/hr
So,
Velocity in m/s will be given by,
v =
Posted by Janhavi Singh 5 years, 1 month ago
- 2 answers
Lucky Girl Lucky 5 years, 1 month ago
Gaurav Seth 5 years, 1 month ago
- Temperature: Solubility of a solid solute increases with increase in temperature.
Solubility of a gas solute decreases with increase in temperature.
Solubility of a gas solute increases with increase in pressure.
Posted by Janhavi Singh 5 years, 1 month ago
- 3 answers
Gaurav Seth 5 years, 1 month ago
If a saturated solution is heated, then it becomes unsaturated because solubility of solute increases on heating .
If a saturated solution is cooled, then some of its dissolved solute will separate out in the form of solid crystal s .
Posted by Navin Jaiswal 5 years, 1 month ago
- 5 answers
Gaurav Seth 5 years, 1 month ago
Cytology is the study of individual cells of the body. Cytology is the medical and scientific study of cells. Cytology refers to a branch of pathology, the medical specialty that deals with making diagnoses of diseases and conditions through the examination of tissue samples from the body.
Posted by Tarini Sahu 5 years, 1 month ago
- 3 answers
Gaurav Seth 5 years, 1 month ago
Diffusion is important as it allows cells to get oxygen and nutrients for survival. In addition, it plays a role in cell signaling, which mediates organism life processes.Diffusion is important for several reason are ;
- It promotes cellular respiration - In order for cells to survive, they need oxygen.
- Oxygen moves from areas of high concentration to low concentration, allowing the cell to respirate.
Nutrients pass through to cells - Cells need nutrients, such as glucose, to survive. Diffusion allows these nutrients to pass through to cells according to their needs.
Shreyansh Jain 5 years, 1 month ago
Posted by Ketul Jadav 5 years, 1 month ago
- 1 answers
Yogita Ingle 5 years, 1 month ago
| Pure Substances | Mixtures |
| It cannot be broken down or separated into new products. | It can be separated using different separation methods. |
| Constant physical and chemical properties. | Mixtures have varying physical and chemical properties. |
| Pure substance consists of a single element. | A mixture is a combination of two substances or elements. |
Posted by Shravya S Rao 5 years, 1 month ago
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Shweta Singh 5 years, 1 month ago
Shree Kushwaha 5 years, 1 month ago
Bangtan Army Forever 5 years, 1 month ago
Posted by Parth Dariyani 5 years, 1 month ago
- 1 answers
Yogita Ingle 5 years, 1 month ago
The boiling point of water is 100°C. The temperature of boiling water does not rise instead of continuous supply of heat, as the extra heat is supplied to the water is used to turn water into steam. Hence, steam has a lot of latent heat which can cause severe burn. That’s why Alka felt intense heat from the puff of steam gushing out of the spout of the kettle.
Posted by Siddhantika Chaturvedi 5 years, 1 month ago
- 3 answers
Shree Kushwaha 5 years, 1 month ago
Yogita Ingle 5 years, 1 month ago
Liquid content in the vacuoles of plant cell is called cell sap. The cell sap contains sugars, amino acid, proteins, minerals and metabolic wastes
Posted by Parth Dariyani 5 years, 1 month ago
- 1 answers
Yogita Ingle 5 years, 1 month ago
1. Temperature and pressure determine the state of a substance. A change in temperature or pressure will result in the change of state of the substance.
2. Strength of the bonds between the atoms. The strength of bonds depends on the temperature or the amount of energy possessed by the matter.
Posted by Parth Dariyani 5 years, 1 month ago
- 2 answers
Shani Baiswade 5 years, 1 month ago
Yogita Ingle 5 years, 1 month ago
Because after exercise we sweat a lot and because of that latent heat takes the heat of our body and evaporates to form vapour. and as we know that evaporation causes cooling.
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Sarita Panda 5 years, 1 month ago
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