CBSE > Class 10 > Science | CBSE Board | Homework Help

In parallel combination on resistances , resistors are connected between the same end point while in series combination ,resistances are connected consecutively one after another.

1Thank You

ANSWER

Micelie

Posted by Himanshu Gupta 6 years, 3 months ago

CBSE > Class 10 > Science

3 answers

Premsukh Meena 6 years, 3 months ago

Clusters of soap formed in water these remove dust

1Thank You

Prateek Gupta 6 years, 3 months ago

soap molecules surrounds dirt when mixed in water and forms micelles.The long carbon chain mixes with dirt and the ionic end remains in water

1Thank You

Ajit Singh 6 years, 3 months ago

Dot structure is Sodium Dot structure is hydrophilic Zigzag structure is hydrophobic Soap are molecules in which two ends have different properties one hydrophilic that is dissolve in water other and the hydrophobic that is dissolved in hydrocarbon that are oily in nature

2Thank You

ANSWER

An electron enters a magnetic field at right angles to it , as shown in fig. 13.14 .The direction of force acting on the electron will be

Posted by Valid Harmolak Singh Jhalli 6 years, 3 months ago

CBSE > Class 10 > Science

3 answers

Aryan Pandey 6 years, 3 months ago

The direction of force is perpendicular to the direction of magnetic field and current as given by Fleming's left hand rule. Recall that the direction of current is taken opposite to the direction of motion of electrons. The force is therefore directed into the page.

1Thank You

Kislay Anand 6 years, 3 months ago

Perpendicular to the plane containing mg. Field and motion of charge particle.

0Thank You

Valid Harmolak Singh Jhalli 6 years, 3 months ago

Into the page

0Thank You

ANSWER

Electric generator works on the principle of elctro magnetic induction....what about electric motor ???

Posted by Nikhil Gowda 6 years, 3 months ago

CBSE > Class 10 > Science

3 answers

Aviral Goyal 6 years, 3 months ago

Electric motor works the principle of magnetic effect of electric cirrent

0Thank You

Kislay Anand 6 years, 3 months ago

Electric motors changes electrical enery to mechanical energy....and "mechanical energy means there is a force for mechanical work"... So , as we know for finding force we can use flemming's left hand rule or we can use right hand palm rule.(current carring conductor generate mag. field around it and also force is a particular direction)

0Thank You

Jayesh King 6 years, 3 months ago

An Electric generator is a device which is used to produce electric energy, which can be stored in batteries or can be directly supplied to the homes, shops, offices, etc. Electric generators work on the principle of electromagnetic induction. A conductor coil (a copper coil tightly wound onto a metal core) is rotated rapidly between the poles of a horseshoe type magnet. The conductor coil along with its core is known as an armature. The armature is connected to a shaft of a mechanical energy source such as a motor and rotated. The mechanical energy required can be provided by engines operating on fuels such as diesel, petrol, natural gas, etc. or via renewable energy sources such as a wind turbine, water turbine, solar-powered turbine, etc. When the coil rotates, it cuts the magnetic field which lies between the two poles of the magnet. The magnetic field will interfere with the electrons in the conductor to induce a flow of electric current inside it.

1Thank You

ANSWER

Give the scientific name of photoreceptor and thermoreceptor

Posted by Aditya Kumar 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years, 3 months ago

Photoreceptors - light receptors.

Thermoreceptors - responds to heat.

2Thank You

ANSWER

Define termite reactions?

Posted by Tushar Sindhi 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Tushar Sindhi 6 years, 3 months ago

Thanks

0Thank You

Aryan Pandey 6 years, 3 months ago

The thermite process of chemical reaction in which a metal oxide is displaced by another molten metal which is more reactive than the metal in the metal oxide, releasing a lot of heat.

2Thank You

ANSWER

Alloys are used in electrical heating devices rather than pure metals? Give some reasons?

Posted by Tushar Sindhi 6 years, 3 months ago

CBSE > Class 10 > Science

4 answers

Tushar Sindhi 6 years, 3 months ago

Thanks

0Thank You

Sandhya Yadav 6 years, 3 months ago

Because of high resistivity and high melting point ??

3Thank You

Deep Antil 6 years, 3 months ago

Because of high melting point they will resist the heat . They will then give heat

1Thank You

Deep Antil 6 years, 3 months ago

Alloys have high melting point

3Thank You

ANSWER

Why NH3,CH4,PH3 have Hydrogen on the right hand side whereas in H20,H2S hydrogen is on the left hand side

Posted by Aditya Singh 6 years, 3 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Determination of the equivalent resistance of two resistors when connected in series and parallel

Posted by Rishav Raj 6 years, 3 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

What do u mean by Meninges?

Posted by Lucifer ? Morningstar? 6 years, 3 months ago

CBSE > Class 10 > Science

4 answers

Aviral Goyal 6 years, 3 months ago

Meninges are the layers that cover the skull

0Thank You

Sandhya Yadav 6 years, 3 months ago

Layers are called meninges

0Thank You

Tushar Sindhi 6 years, 3 months ago

Bad thinker are also meaningless

0Thank You

Arpit Maurya 6 years, 3 months ago

Layers

0Thank You

ANSWER

It is establish that an electric current through a conductor produces a magnetic field around it is there a similar magnetic field around a thin beam of moving (a) alpha particles (b) neutron Justify your answer in each way?

Posted by Pankaj Gaur 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years, 3 months ago

(i) Alpha particles being positively charged constitute a current in the direction of motion, therefore magnetic field will be produced around a thin beam of moving alpha particles.
(ii) The neutrons being electrically neutral constitute no current, so no magnetic field will be produced around a thin beam of moving neutrons.

0Thank You

ANSWER

Whai is the similariters between pepsin and trypsum

Posted by Mizba Kounain 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Arpit Maurya 6 years, 3 months ago

Both convert protein to pepsinogen

1Thank You

Shubham Deshwal 6 years, 3 months ago

Both of them act on protein

1Thank You

ANSWER

Write mendeleev's periodic law.

Posted by Sahil Behera 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Aviral Goyal 6 years, 3 months ago

The properties of elements are the periodic function of their atomic masses

0Thank You

Yogita Ingle 6 years, 3 months ago

Mendeleev’s Periodic Law states that the properties of elements are the periodic function of their relative atomic masses.

Mendeleev arranged all 63 elements; which were discovered till his time; in the order of their increasing relative atomic masses in a tabular form. It is known as Mendeleev’s Periodic Table. He divided the table in eight columns and seven rows. The columns are known as groups and rows are known as periods.

1Thank You

ANSWER

State law of reflection

Posted by Shams Syed 6 years, 3 months ago

CBSE > Class 10 > Science

3 answers

Arpit Maurya 6 years, 3 months ago

Angle of incidence = Angle of reflection """". and """"""""" and normal all lie on same plane

0Thank You

Yogita Ingle 6 years, 3 months ago

The two laws of reflection are:

(i) the incident ray, the reflected ray and the normal (at the point of incidence), all lie in the same plane.

(ii) the angle of reflection (r) is always equal to the angle of incidence (i)

∠r = ∠i

2Thank You

Shubham Rawat 6 years, 3 months ago

Angle of incidence is equal to angle of reflection Incident ray Normal ray &Reflected ray all the three lie on the same plane

4Thank You

ANSWER

What is Ampoteric oxide??

Posted by Ayush Verma 6 years, 3 months ago

CBSE > Class 10 > Science

3 answers

Priyanshu Sinha 6 years, 3 months ago

Oxide of metal which have both acidic as well as basic behaviour is known as amphoteric oxide. For example-;Al2O3 etc

1Thank You

Arpit Maurya 6 years, 3 months ago

Those Oxides which posses both nature , acidic and basic , called amphoteric oxides. Ex- Al2aO3 and ZnO

2Thank You

Aadya Singh ? 6 years, 3 months ago

The metallic oxides which behaves as an acid or base both is called amphotheric oxide. Example- aluminum oxide and zinc oxide.

6Thank You

ANSWER

Why do we see different variety of organisms around us?

Posted by Mayank Garg 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Arpit Maurya 6 years, 3 months ago

Because of variation s

1Thank You

Yogita Ingle 6 years, 3 months ago

We see different organisms around us as a result of biodiversity.
Biodiversity is the variety of life on Earth which includes number of different species of plants and animals in an environment. It also comprises of ecosystem, interrelationship between organisms of the ecosystem etc. Biodiversity should be preserved.

2Thank You

ANSWER

Difference between heredity and reproduction

Posted by Kinjal Sanghavi Sanghavi 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Arpit Maurya 6 years, 3 months ago

Heredity- . Passing of traits Reproduction- production of new individual from parents.

3Thank You

ANSWER

A hrdrocarbon C2H4 discolours bromine water

Posted by Dhruv Upadhyay 6 years, 3 months ago

CBSE > Class 10 > Science

3 answers

Arpit Maurya 6 years, 3 months ago

Saturated hydrocarbon

0Thank You

Gaurav Seth 6 years, 3 months ago

A) The hydrocarbon is Ethene.

b) It belongs to the Alkene family.

c) C2H4 + H2O -> C2H5OH
Alcohol is formed due to attack of OH-.

d) C2H4 + Br2 -> C2H2Br2
The bromine gets di substituted across the double bond.

e) Polymer of ethene is polythene which is commonly used as plastic bags.

0Thank You

Arpit Maurya 6 years, 3 months ago

Ethane

0Thank You

ANSWER

Ethanoic acid was added to sodium bicarbonate solution and the gas evolved was tested with burning splinter which of the following observation is correct the gas burns with a Pop sound and the flame get extinguished Oriflame extinguished and the gass do not burn

Posted by Arpita Sood 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Arpit Maurya 6 years, 3 months ago

Hydrogen make pop sound Co2extiniguised burn

2Thank You

⛩Singh Emperor ???? 6 years, 3 months ago

Due to evolution of CO2 gas it burn with pop sound...

2Thank You

ANSWER

Salvary process

Posted by Lakshmi Rajput 6 years, 3 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

What is methane

Posted by Ashish Gupta 6 years, 3 months ago

CBSE > Class 10 > Science

3 answers

Kaju Singh 6 years, 3 months ago

as we know Meth=1 General formula=CnH2n+2 Put value of n=1 C1H2×1+2=CH4 Ans = CH4

1Thank You

Dhruv .. 6 years, 3 months ago

Ch4

4Thank You

Arpit Maurya 6 years, 3 months ago

CH2

0Thank You

ANSWER

Name any multicellular organism which reproduces by breeding method

Posted by Vishkarma Paratap 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Arpit Maurya 6 years, 3 months ago

Hydra and paramaecium

3Thank You

ANSWER

Sweet tooth may lead to tooth decay. Explain why? What is the role of tooth paste is preventing cavities

Posted by Abhishek Verma 6 years, 3 months ago

CBSE > Class 10 > Science

3 answers

Gouri Patil 6 years, 3 months ago

Toothpaste contains those things which are basic in nature so when we eat anything the pH our mouth is acidic so so when we brush our teeth the acidic level goes down and our mouth becomes basic in nature . Therefore toothpaste help in preventing tooth decay

0Thank You

Arpit Maurya 6 years, 3 months ago

Bacteria present in mouth causes tooth decy by making acid with sweet things. Toothpaste is alkaline in nature that neutralize pH of acid level in mouth

0Thank You

Aadya Singh ? 6 years, 3 months ago

Bacteria present in our mouth produces acid by degradation of sugar and food remaining after eating which lead the ph of mouth less than 5.5 and cause tooth decay. Toothpaste neutralizes the excess acid and prevent tooth decay.

3Thank You

ANSWER

What is penial tube

Posted by Jp Mahala 6 years, 3 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Fertilizarion in plant

Posted by As Randev 6 years, 3 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

What is collidle

Posted by Anand Kashyap 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years, 3 months ago

Colloid: A colloid is a heterogeneous mixture whose particles are not as small as solution but they are so small that cannot be seen by naked eye. When a beam of light is passed through a colloid then the path of the light becomes visible. For example milk, smoke etc.
Properties of a colloid
• A colloid is a heterogeneous mixture.
• The size of particles of a colloid is too small to be individually seen by naked eyes.
• Colloids are big enough to scatter a beam of light passing through it and make its path visible.
• They do not settle down when left undisturbed, that is, a colloid is quite stable.
• They cannot be separated from the mixture by the process of filtration. But, a special technique of separation known as centrifugation can be used to separate the colloidal particles.

2Thank You

ANSWER

What is a chym ?

Posted by Rukhsar Malik 6 years, 3 months ago

CBSE > Class 10 > Science