Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Muskan Kumari 5 years, 2 months ago
- 3 answers
Satyarth Raj 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
- In diamond, each carbon atom is covalently bonded with four other carbon atoms.
- So, the four outermost electrons of a carbon atom are engaged or trapped in the covalent bonds, having no free electrons making it a bad conductor of electricity.
Posted by School Lol 5 years, 2 months ago
- 1 answers
Gaurav Seth 5 years, 2 months ago
1.
<main data-sumo-smart-bar-data="{"originalInlineStyles":{"top":"","bottom":"","marginTop":"","marginBottom":""},"originalOffset":{"top":"auto","bottom":"auto"},"originalOffsetTop":130,"originalTransition":"all 0s ease 0s","originalInlineTransition":"","originalMarginTop":"0px","originalMarginBottom":"0px"}" id="genesis-content"> <article>In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) The statement of the Assertion is false but the Reason is true.
1. Assertion: When air is passed through lime water, lime water turns milky.
Reason: Air contains 78% nitrogen and 21% oxygen.
Answer: b
Explanation:
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
2.
The correct option is: (d) A is false, but R is true.
Explanation:
The digestion of protein begins in stomach. The enzyme pepsin acts on protein and brings about their breakdown in the stomach. The protein-digesting enzymes from pancreas are released into small intestine.
</details> </article> </main>Posted by Kanishk Panshari 5 years, 2 months ago
- 3 answers
Posted by Kanishk Panshari 5 years, 2 months ago
- 2 answers
Posted by Rishabh Barde 5 years, 2 months ago
- 1 answers
Gaurav Seth 5 years, 2 months ago
| Sl. No. | Differentiating Property | Resistance | Resistivity |
| 1 | Definition | Resistance is the physical property of a substance because of which it opposes the flow of current i.e. electrons. | Resistivity is the physical property of a particular substance which is having particular dimensions. |
| 2 | Proportionality | Resistance is directly proportional to the length and temperature while it is inversely proportional to the cross-sectional area of the material. | Resistivity is only proportional to the nature and temperature of the particular material. |
| 3 | Symbol | R | ρ |
| 4 | Formula | R = V/I or, R = ρ(L/A)V = Voltage, I = Current, ρ = Resistivity |
ρ = (R×A)/L
R = Resistance, L= Length, A = Cross-sectional area |
| 5 | SI Units | The SI unit of resistance is Ohms | The SI unit of resistivity is Ohms-meter. |
| 6 | Applications | The property of resistance is used in several places like heaters, fuses, sensors, etc. | Electrical resistivity measurement is used as a quality control test for calcareous soil. |
Posted by Paru ? 5 years, 2 months ago
- 4 answers
Gaurav Seth 5 years, 2 months ago
they are called as convergent and divergent mirror:
When parallel light rays fall on the surface of convex mirror then after reflection those rays seem to meet (diverge) at a single point but actually they do not meet. So, it is called diverging mirror.
When parallel light rays fall on the surface of a concave mirror, all the rays after reflection converge(meet) at a single point(focus). Hence, a concave mirror is also called a converging mirror.
Gaurav Seth 5 years, 2 months ago
All the light rays reflected by concave mirror converges at its focus. Hence, concave mirror is also known as converging mirror.
Gaurav Seth 5 years, 2 months ago
|
Concave mirror |
Convex mirror |
|
A spherical mirror whose reflecting surface is curved inwards is called a concave mirror. |
A spherical mirror whose reflecting surface is curved outwards is called a convex mirror. |
|
|
|
|
A parallel beam of light falling on this mirror converges at a point after reflection. |
A parallel beam of light falling on this mirror appears to diverge from a point after reflection. |
|
It is also called a converging mirror. |
It is also called a diverging mirror. |
|
It has a real focus. |
It has a virtual focus. |
|
The magnification of a concave mirror can be greater, equal or less than 1. |
The magnification of a convex mirror is always less than 1. |
|
These mirrors are used as reflectors in projectors, light-house headlights, searchlights, etc. |
These mirrors are used as rear-view mirrors in cars and motorcycles, as they enable the driver/rider to view the road and vehicles behind. |
Posted by Phani Sri 5 years, 2 months ago
- 2 answers
Posted by Kishor Kumar Naik 5 years, 2 months ago
- 2 answers
Pooja Raj Shekar 5 years, 2 months ago
Gaurav Seth 5 years, 2 months ago
An object is placed 10 cm from a convex mirror of radius of curvature 60 cm then find position of image
A n s w e r :
Radius of curvature = 60 cm ; hence focal length f = 30 cm
We have mirror equation : 
where v is image to mirror distance, u is object to mirror distance. we get v = -7.5 cm from above equation.
Hence image is formed at a distance 7.5 cm behhind the convex mirror
Posted by Syed Aahil 5 years, 2 months ago
- 1 answers
Gaurav Seth 5 years, 2 months ago
Solution :
Given: Two resistors with resistances R1=5ohm and R2=10ohm, V=6volt
(a) For minimum current these two should be connected in series. For maximum current these two should be connected in parallel.
(b)In series,
Total resistance = 5+10 = 15ohms
Therefore total current drawn = V/R = 6/15 = 0.4amps
In parallel,
Total resistance R is given as 1/R=1/R1+1/R2
1/R =1/5+1/10
1/R=3/10
R=10/3 ohm
Therefore total current drawn by the circuit = V/R = 6/(10/3) =1.8amps.
Posted by Satyam Rai 5 years, 2 months ago
- 2 answers
Gaurav Seth 5 years, 2 months ago
Ohm’s Law
George Simon ohm(in 1826)studied relationship between I and V across the ends of conductor.
Ohm’s Law states that electric current flowing in a conductor is directly proportional to potential difference across the ends of the conductor,provided temperature and other physical conditions remains constant.
V=IR
R=Resistance of conductor
Resistance of a conductor is the property of conductor to oppose the flow of charge through it.
R = V/I
Posted by Renu Choudhary 5 years, 2 months ago
- 2 answers
Yogita Ingle 5 years, 2 months ago
Dialysate solution or dialyzing fluid is a nonsterile aqueous electrolyte solution that is similar to the normal levels of electrolytes found in extracellular fluid with the exception of the buffer bicarbonate and potassium.
Posted by Mayank Chaudhary 5 years, 2 months ago
- 2 answers
Yogita Ingle 5 years, 2 months ago
- The resistivity of a material is the resistance of a wire of that material of unit length and unit cross-sectional area. The unit for resistivity is the ohm-metre.
- The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size.
- A good conductor has less resistivity, whereas a bad conductor or insulator has high resistivity.
Ashutosh Singh Choudhary 5 years, 2 months ago
Posted by Abhishek Kumar 5 years, 2 months ago
- 1 answers
Gaurav Seth 5 years, 2 months ago
Homologous series: A series of organic compounds having similar structures and chemical properties and in which the successive compounds differ by -CH2 group is called a homologous series. A homologue of CH3OH will differ by the -CH2 group; therefore, methanol's successive homologue will be ethanol (C2H5OH).
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
- 3 answers
Charu Gupta 5 years, 2 months ago
Pragati Verma 5 years, 2 months ago
Posted by Rajan Singh 5 years, 2 months ago
- 4 answers
Ipsita Seal 5 years, 2 months ago
Meenal Khandelwal 5 years, 2 months ago
Satyarth Raj 5 years, 2 months ago
Posted by Rajan Singh 5 years, 2 months ago
- 1 answers
Meghna Thapar 5 years, 2 months ago
The field of a synchronous generator is the winding to which the DC excitation current is applied. The armature is the winding to which the load is connected. In small generators, the field windings are often on the stator, and the armature windings are on the rotor. The core of an armature is made up of lots of thin metal plates called laminations, which are usually about 0.5mm thick. The thickness of laminations depend upon the frequency at which the armature is designed to work. Laminations are stamped out on a press.
Posted by Rajan Singh 5 years, 2 months ago
- 5 answers
Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
Meghna Thapar 5 years, 2 months ago
A nephron is the basic structural and functional unit of the kidneys that regulates water and soluble substances in the blood by filtering the blood, reabsorbing what is needed, and excreting the rest as urine. Its function is vital for homeostasis of blood volume, blood pressure, and plasma osmolarity. The functional unit of the kidney is the nephron and it is called the functional unit because its the smallest structure in the kidney that can carry out its functions.
Posted by Lavi Awasthi 5 years, 2 months ago
- 2 answers
Meghna Thapar 5 years, 2 months ago
Optical density is the process of transmission of light or other electromagnetic radiation by matter. A measure of the transmittance through an optical medium. In spectroscopy, optical density is the measure of absorbance, and is defined as the ratio of the intensity of light falling upon a material and the intensity transmitted. The optical density of a material relates to the sluggish tendency of the atoms of a material to maintain the absorbed energy of an electromagnetic wave in the form of vibrating electrons before reemitting it as a new electromagnetic disturbance.
Rajan Singh 5 years, 2 months ago
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
- 3 answers
Rajan Singh 5 years, 2 months ago
Posted by Usha Rani Jena 5 years, 2 months ago
- 3 answers
Posted by Ronak Chawda 5 years, 2 months ago
- 1 answers
Meghna Thapar 5 years, 2 months ago
The conversion of ethanol to ethanoic acid is as follows:
CH3CH2OH+KMnO4(Alkaline)→CH3COOH
If you see the above change carefully you will notice that this in this change one extra O atom is been added and two H atoms are being removed from ethanol molecule to convert it into ethanoic acid.Addition of O and removal of H is known as oxidation.
Posted by Rash Kumar 5 years, 2 months ago
- 4 answers
Yogita Ingle 5 years, 2 months ago
NaCl+AgNO3---- AgCl + NaNO3
This reaction is both precipitation reaction as well as double displacement reaction. In a double displacement reaction the anions are exchanged and in a precipitation reaction, a precipitate is formed in the end. In this case, AgCl is the precipitate.
Posted by Kesahv Deshmukh 5 years, 2 months ago
- 1 answers
Meghna Thapar 5 years, 2 months ago
The word dilation, in terms of human physiology, means to relax, open, or widen. ... Dilation is an autonomic process, which means it cannot be consciously controlled. It is used as a method of regulating, or controlling, the passage of materials, fluids, and solids within the body. Dilatation is defined as a region of dilation, an area of abnormal enlargement, or the surgical enlargement of a region (noun describing the verb). Dilation is defined as the act of dilating (stretching out), the state of being dilated, and confusingly: dilatation. Both definitions cross-refer to one another.
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
- 2 answers
Gaurav Seth 5 years, 2 months ago
The variation is important and beneficial for species as it allows a species to adapt to a changing environment.
For example, climate change can force a species to shift its range to poleward or to higher altitudes.
Only those who adopt the changes can survive in harsher conditions by adapting to the changes.
For an individual, the variation doesn't matter in most of the conditions.
Take the example of we humans, if a climate change happens, we can shed our clothes and our body will help us control the temperature, and if the environment gets colder, we can wear more clothes to protect us.
However, in conditions like any new virus or bacteria attack which is harmful to humans, our body has to adapt according to this scenario or we will perish.
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
- 2 answers
Yogita Ingle 5 years, 2 months ago
- Lightning can be explained in terms of charges produced due to rubbing. During a thunderstorm, the air currents move upwards and the water droplets move downwards. And this caused due to the separation of charge due to this vigorous motion.
- As a result of this process, the positive charges collect near the upper edge and the negative charges accumulate near the lower edge of the cloud and also near the ground.
- As the charge gets accumulated, its magnitude becomes very large. Water droplets in the air act as a conductor of this charge.
- These charges flow to meet, thus producing strikes of lightning and thunder. For this phenomenon to occur, a sufficiently high elect
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Harsh Patel 5 years, 2 months ago
1Thank You