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Ask QuestionPosted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
- 2 answers
Gaurav Seth 5 years, 2 months ago
The metallic body of electric appliances is connected to the earth by means of earth wire so that any leakage of electric current is transferred to the ground. This prevents any electric shock to the user.
Reason
The metallic body is connected to the earth wire, that provides a low resistance conducting path for the current. Thus it assures that any leakage of current to the metallic body of the appliances keeps its potential to that of the earth and the user may not get a severe shock.
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
- 2 answers
Yogita Ingle 5 years, 2 months ago
Following precautions should be taken to avoid the overloading of domestic circuits:
(a) Do not use too many appliances at the same time.
(b) Use the appliances within the safe limit of electric circuit.
(c) Do not connect too many appliances in a single socket.
(d) Fuse should be connected in series in the circuit to protect overloading and short circuiting.
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
- 3 answers
Varun Kumar Barnwal 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
Brain gets the maximum protection, as it is housed inside the skull. Spinal cord gets protection by the vertebral column. Additionally, the brain and the spinal cord are surrounded by a system of three layers; called meninges. The cerebrospinal fluid; filled between these membranes; provides a cushion against mechanical shocks.
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
- 2 answers
Yogita Ingle 5 years, 2 months ago
Principle: An electric generator works on the principle of electromagnetic induction. When a coil is rotated between the magnet or when the magnet is rotated in and out of the coil the current is induced in the coil and the direction of current is given by Fleming’s right hand rule.
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
- 2 answers
Yogita Ingle 5 years, 2 months ago
The refractive index of diamond is 2.42. This means that the speed of light in diamond will reduce by a factor of 2.42 as compared to its speed in air.
In other words, the speed of light in diamond is 1/2.42 times the speed of light in vacuum.
Posted by Arman Pathan 5 years, 2 months ago
- 1 answers
Meghna Thapar 5 years, 2 months ago
When a soap is used in hard water, a solid substance we call scum forms. This is because charged calcium and magnesium particles (called ions ) present in the water react with soap to form an insoluble substance. Only when all the calcium ions have been precipitated out as scum will the water lather. Thus the volume of soap solution measures the amount of hardness. Permanently hard water contains calcium or magnesium salts other than the hydrogen carbonates.
Posted by Somya Sharma 5 years, 2 months ago
- 1 answers
Posted by Dilraj Kâlêsh 5 years, 2 months ago
- 2 answers
Posted by Dilraj Kâlêsh 5 years, 2 months ago
- 1 answers
Yogita Ingle 5 years, 2 months ago
Reflection of Light: The phenomenon of bouncing back of light into the same medium by the smooth surface is called reflection.
Refraction of Light: The bending of light at the interface of two different mediums is called the Refraction of light.
- If the velocity of light in a medium is more, then the medium is called optical rarer.
For Example, air or vacuum is more optical rarer. - If the velocity of light in medium is less, then medium is called optical denser.
Example, glass is more denser than air.
Posted by Swayamshree Rout 5 years, 2 months ago
- 1 answers
Posted by Khushi Anurag 5 years, 2 months ago
- 1 answers
Yogita Ingle 5 years, 2 months ago
- In Mendeleev periodic table, vertical columns in the periodic table and horizontal row in the periodic table were named as groups and period respectively.
- The periodic table is composed of seven horizontal rows or periods and is numbered between 1 and 7.
- There is a regular gradation in the properties of elements in the horizontal rows(periods) from left to right.
- The periodic table is composed of eight vertical columns or groups. They ‘re numbered between 1 to 8.
- If the element is similar but not much, to distinguish between them it is placed below and slightly away from it. Thus, each column will have two sub-columns A and B, so elements will show more similarity in the same sub-columns.
Posted by Rishabh Mishra 5 years, 2 months ago
- 2 answers
Yogita Ingle 5 years, 2 months ago
Bifocals: A bifocal lens is created with two different areas of vision correction, which are divided by a distinct line that sits horizontally across the lens. The top portion of the lens is used for distance, while the bottom portion of the lens is used for closer vision.
Vvijay Narra 5 years, 2 months ago
Posted by Sayed Kaif 5 years, 2 months ago
- 4 answers
Yogita Ingle 5 years, 2 months ago
The arrangement of the system should be in parallel.
We can prove it with the help of formula
1/R= 1/R1 + 1/R2
1/R = 1/2 +1/2
1/R = 1
R= 1 Ohm
Posted by Sayed Kaif 5 years, 2 months ago
- 2 answers
Yogita Ingle 5 years, 2 months ago
R1 = R2 = R3 = 3 Ω
1/R = 1/R1 + 1/R2 + 1/R3
= 1/3 + 1/3 + 1/3 = 3/3 = 1
∴ R = 1 Ω
Posted by Sumit Sharma 5 years, 2 months ago
- 2 answers
Priya Yadav 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
The chemical bond formed by the sharing of an electron pair between two atoms so that both the atoms get their octet complete is called covalent bond. The molecules formed as a result of sharing of electron between two atoms are called as covalent molecules
Posted by Sayed Kaif 5 years, 2 months ago
- 1 answers
Gaurav Seth 5 years, 2 months ago
According to the law of combination of resistance in parallel, the reciprocal of the combined resistance of a number of resistances connected in parallel is equal to the sum of the reciprocals of all the individual resistances.
Posted by Sayed Kaif 5 years, 2 months ago
- 3 answers
Gaurav Seth 5 years, 2 months ago
If five resistances are connected in series and all are of 0.2 ohm then their resistances would be added.
As per the law of combination of resistances in series,
R = R1 + R2 + R3 + R4 + R5
R = 0.2 + 0.2 + 0.2 + 0.2 + 0.2 = 1ohm
Posted by Sayed Kaif 5 years, 2 months ago
- 2 answers
Sayed Kaif 5 years, 2 months ago
Gaurav Seth 5 years, 2 months ago
According to the law of combination of resistances in series, the combined resistance of any number of resistances connected in series is equal to the sum of the individual resistances.
Posted by Kalvakolu Akshaya 5 years, 2 months ago
- 1 answers
Gaurav Seth 5 years, 2 months ago
Mirror Formula
The distance of an object on principal axis from pole of spherical mirror is called object distance(u).
The distance of position of image on principal axis from pole of spherical mirror is called image distance(v).
1 1 1
—- + —- = —-
u v f
Posted by Ravi Bhatt 5 years, 2 months ago
- 1 answers
Gaurav Seth 5 years, 2 months ago
Carbon has four electron in its valence shell orbital. So, it can neither accept nor gain four electron. One way to complete octet is by sharing of electrons. So, carbon forms covalent bond to complete its octet.
Posted by Ujjwal Kumar 5 years, 2 months ago
- 3 answers
Gaurav Seth 5 years, 2 months ago
Phosphorus has valency 3.
The valence (or valency) of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules.
In PH3, P is combined to 3 H atoms, so the valency of phosphorous is +3.
Yogita Ingle 5 years, 2 months ago
The number of valence electrons or the number of electrons in the outermost shell of phosphorus is 3. - Thus, one atom of phosphorus is capable of combining with three atoms of hydrogen in order to form phosphine (PH3). Therefore, the valency of phosphorus in PH3 is +3.
Posted by Divya Goswami 5 years, 2 months ago
- 4 answers
Posted by ?Isha .B 5 years, 2 months ago
- 1 answers
Yogita Ingle 5 years, 2 months ago
R = ρ* L/A
R ∝ L And R ∝ 1/A
here, length is reduced to 1/5 times so resistance also reduced to 1/5 times
so, resistance is 20/5 Ω = 4 Ω
Again, Area is doubled so resistance get half.
so, New resistance is 4/2Ω = 2Ω
Posted by Gautam Iyer 5 years, 2 months ago
- 5 answers
Palak Arora 5 years, 2 months ago
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Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
1Thank You