CBSE > Class 09 > Science | CBSE Board | Homework Help

22k gold jewellery means that 22 parts of the jewellery contain gold and the balance 2 parts are some other metals. It has 91.6%gold mixed with the rest

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Chhaya Ff 3 years ago

Solid

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Jayanthi Sagu 3 years ago

Pure gold but we cannot make any such type of ornaments

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What is units

Posted by Saurabh Srivastava 3 years ago

CBSE > Class 09 > Science

3 answers

Yash Yash Patel 3 years ago

1. The known quantity which used in measurements is called unit. 2. For example... When you say I traveled 50meter the measurements of distance is being expressed in number i.e.,50 and unit meter 3. 5 kg of vegetables, here kg is the unit

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Anushka Yadav 3 years ago

Answer

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Saurabh Srivastava 3 years ago

What is units

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ANSWER

How do a astronomer get back to his ship if he suddenly falls out of ship explain usimg newtons third law

Posted by Sαurαbh Yadav 3 years ago

CBSE > Class 09 > Science

3 answers

Preeti Dabral 3 years ago

According to Newton's third law of motion, for every action, there is an equal and opposite reaction. When the man jumps from a boat, he applies force on the boat due to which boat moves backward. An equal force is exerted by the boat on the man which helps the man to jump out of the boat.

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Yash Yash Patel 3 years ago

According to Newtown third law of motion, for energy action, there is an equal and opposite reaction. When the man jumps from a boat ⛵ , he applies force on the boat due to which boat moves back wards . An equal force us exerted by the boat ⛵ on the man which helps the man to jump out of the boat ⛵⛵⛵ in the water that's why a astronomer get back to his ships if he suddenly fall fall out to the ship.

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Sαurαbh Yadav 3 years ago

Oh that wasnt ship it was outside space space shuttle

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ANSWER

Guess which sound has a higher pitch : guitar or car horn ?

Posted by Suresh Singh 3 years ago

CBSE > Class 09 > Science

5 answers

Suresh Singh 3 years ago

Guitar

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Sarthak Desale 3 years ago

Guitar , as it has higher frequency.

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Sonakshi Rohilla 3 years ago

Guitar

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Anshuman Mishra 3 years ago

Guitar

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Suresh Singh 3 years ago

Car horn

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ANSWER

Differentiate plant cell and animal cell

Posted by Shaivya Parikh 3 years ago

CBSE > Class 09 > Science

4 answers

Preeti Dabral 3 years ago

Plant Cell	Animal Cell
Cells comparatively larger in size	Cells usually small in size
Cell wall present	Cell wall absent
Plastids present	Plastids absent
Vacuole are large and generally one	Vacuales are absent, if present small in size and large in number
Dictyosmoes (Golgi apparatus) are present	Prominent Golgi apparatus are present

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Kartik Thakur 2 years, 11 months ago

Plant cell have plastids Animals cell dont have plastids Plant cell have large vacuole Animal cell have small or they are absent Plant cell have cell wall which provide rigidity Animal cell has no cell wall there cell have irregular shape Please check it this is right

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Yash Yash Patel 3 years ago

The shaps of plant cell square where's the shaps of animal cell is irregular or round. In plant cell cell wall and plasma is present but in animal cell, cell wall is absent And cell membrance is present

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Kashaf Ansari 3 years ago

Plant Cell Animal Cell Cells comparatively larger in size Cells usually small in size Cell wall present Cell wall absent Plastids present Plastids absent Vacuole are large and generally one Vacuales are absent, if present small in size and large in number Dictyosmoes (Golgi apparatus) are present Prominent Golgi apparatus are present

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Highest marks of molecular

Posted by Yogesh Pratap Singh 3 years ago

CBSE > Class 09 > Science

0 answers

ANSWER

An electric heater of 1000W is used for 2 hour a day. What is costing of using it for a month of 28 days , if one unit costs Rs. 3 .

Posted by Devansh Singhal 3 years ago

CBSE > Class 09 > Science

4 answers

Preeti Dabral 3 years ago

energy consumed by heater of 1000W for 2h in one day=1000/1000×2 =2units number of units=W×h×day/1000 energy consumed by heater in 28 day 2×28=56units cost of 1unit =RS 3 cost of 56unit=3×56=RS 168

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Kartik Thakur 2 years, 11 months ago

Rs. 168

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Yash Yash Patel 3 years ago

The answer is १६८. Explanation: Given power of a electric heater= १०००w = kw Time per day = २×२०० days= ५६ The formula of energy is given by= Energy= १×५६ = Energy= ५६ kWh Now १kWh costs RS.३ (a unit in the electricity Bill is represented in KWH or kilowatt Hour. This is the actual electricity of energy used). Then the costs of ५६ KWH will be = ३×५६= RS.१६८

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Jayanthi Sagu 3 years ago

56x3=168

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ram went to rectangular path having dimension 5× 3 cover this path in 36 seconds what will be the displacement after 100 seconds

Posted by Bhumika Chouhan 3 years ago

CBSE > Class 09 > Science

1 answers

Devansh Singhal 3 years ago

(5 x 3 ) / .77

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ANSWER

What would happen if the plasma membrane reptures or break down

Posted by Anushriya Pradhan 3 years ago

CBSE > Class 09 > Science

2 answers

Preeti Dabral 3 years ago

Plasma membrane is the selectively permeable membrane that surrounds the cell and allows the entry and exit of selected materials of the cell. If it ruptures, the contents of the cell will come in direct contact with the surrounding medium and not only unwanted material will be able to enter freely into the cell, but useful material will also find its way out of the cell easily. This will seriously disrupt the various metabolic activities of the cell and will result in its eminent death.

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Kashaf Ansari 3 years ago

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Haversian canals are present in

Posted by Aman Siddiqui 3 years ago

CBSE > Class 09 > Science

2 answers

Parth Rana Rana Ji 3 years ago

Bone

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Yash Seth 3 years ago

Bone

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ANSWER

Who invented voltaic cell?

Posted by Sachin Kumar 3 years ago

CBSE > Class 09 > Science

3 answers

Pari Rai 3 years ago

Alessandro volta

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Sachin Kumar 3 years ago

_*~*_

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Sachin Kumar 3 years ago

Alexandro volta

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ANSWER

How to find buoyant force

Posted by Account Deleted 3 years ago

CBSE > Class 09 > Science

4 answers

Nandani . 3 years ago

Buoyant force = weight of water displaced by the submersed part of the object in water. Acc.to Archimedes principle

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Account Deleted 3 years ago

Sorry Sachin but I cannot understand what you write

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Sachin Kumar 3 years ago

3a1Sr

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Account Deleted 3 years ago

Please tell me about it

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Why we are able to sip hot tea or milk faster from a saucer rather than a cup

Posted by Tawfeeq Ahmed Sheikh 3 years ago

CBSE > Class 09 > Science

1 answers

Account Deleted 3 years ago

As it takes more area and tea from saucer can be cool from the corners

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What was the role of plastids in the potato cell ?

Posted by Suprabhat Borah 3 years ago

CBSE > Class 09 > Science

1 answers

Preeti Dabral 3 years ago

Leucoplasts are the colourless plastids that store food in the form of starch, proteins, fats, and oil. In potatoes, leucoplasts store food in the form of starch. Chloroplasts and chromoplasts give colour to the plant parts.

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Difference Between,. 2H & H ²

Posted by Siddhesh Deshpande 3 years ago

CBSE > Class 09 > Science

1 answers

Preeti Dabral 3 years ago

H₂ represents one molecule of H₂ (hydrogen gas) whereas 2H represents two separate atoms of hydrogen.

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Difference Between, 1) Compound 2) Molecule

Posted by Siddhesh Deshpande 3 years ago

CBSE > Class 09 > Science

2 answers

Preeti Dabral 3 years ago

A molecule is a group of two or more atoms held together by chemical bonds. A compound is a substance which is formed by two or more different types of elements which are united chemically in a fixed proportion.

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Ansh Yadav 3 years ago

A molecule is group of atom . A compound is substance made of two or more particles

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Function of aeriolar tissue

Posted by Bhavya Pandey 3 years ago

CBSE > Class 09 > Science

1 answers

Preeti Dabral 3 years ago

Acts as a binding tissue. Bind the skin with muscles. Bind the blood vessels and nerves with other structures of body. Helps in healing of wounds.

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Explain momentum

Posted by Anjali Yadav 3 years ago

CBSE > Class 09 > Science

2 answers

Preeti Dabral 3 years ago

Momentum is defined as the product of mass and velocity , i.e. Momentum = mass × velocityor P = m×v = mvFor e.g. ~ a bullet fired from a pistol , etc.......Hope h like it .. ?

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Account Deleted 3 years ago

Momentum,p = mass,m x velocity,v

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ANSWER

How do biotic & abiotic factors affect crop production?

Posted by Pratyush Kumar Naik 3 years ago

CBSE > Class 09 > Science

5 answers

Sachin Kumar 3 years ago

...

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Samiksha Raturi 3 years ago

CBSE sample paper science

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Mrunali Salunke 3 years ago

Biotic factors - Insects, rodents etc that feeds on crop. Abiotic factors - Unfavorable condition of humidity and temperature

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Account Deleted 3 years ago

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Priyanshu Kumar 3 years ago

They affect production by the major causes A biotic. It

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Describe with the help of a diagram,how compression and rarefaction are product in air near a source of sound

Posted by Subodh Bansode 3 years ago

CBSE > Class 09 > Science

1 answers

Preeti Dabral 3 years ago

Sound waves are propagated because of compressions and rarefactions in the particles of the medium.
The region, where particles come closer, is called compression and region where particles move farther from each other is called rarefaction.

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A loaded truck starts from rest and rolls down a hilly road with a constant acceleration. The truck travels a distance of 1 km in 60 s, What is its acceleration? Find the magnitude of net force acting on the truck if its mass in 7200 kg

Posted by Account Deleted 3 years ago

CBSE > Class 09 > Science

2 answers

Harsh Pandey 3 years ago

Acceleration is 10by18 meter per second square

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Harsh Pandey 3 years ago

4500N

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Engine of a train exerts a force of 6000 N. If total mass of the train and the engine be 18000kg, and initially the train was standing on the platform, what is the magnitude of velocity attained by the train 20s after the start? Assume that there is no frictional force between the railway track and the train and motion is in a horizontal direction.

Posted by Account Deleted 3 years ago

CBSE > Class 09 > Science

2 answers

Rohit Luna 3 years ago

F=MA THEN, 6000=18000×A, A=6000/18000, A=0.3 m/s² THEN, WE HAVE FIND THE FINAL VELOCITY BY FIRST EQUATION OF MOTION V=U+AT V=0+0.3×20 V=6m/s

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Account Deleted 3 years ago

Please answer me for this question

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ANSWER

For any substance why does the temperature remain constant during the change of state?

Posted by Vanshika Tangri 3 years ago

CBSE > Class 09 > Science

3 answers

Rohit Luna 3 years ago

Because of latent heat is supplied to the matter to change the state of matter then the latent heat is used in break down the intermolecules of the matter

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Harsh Pandey 3 years ago

It is due to the latent heat as the heat supplied to increase the temperature of the substance is used up to transform the state of matter of the substance hence the temperature stays constant.

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Vanshika Tangri 3 years ago

Answer plz

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ANSWER

Difference between prokaryotic &Eukoryotic cells

Posted by Vanshika Tangri 3 years ago

CBSE > Class 09 > Science

5 answers

Ansh Yadav 3 years ago

Pro means primitive and karyotic mean nuclear and eu means true and karyotic means nuclear

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Vanshika Tangri 3 years ago

Thx for answer

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Vanshika Tangri 3 years ago

Thx for answer

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Mr.Harsh Chavda 3 years ago

Prokaryotes are always unicellular, while eukaryotes are often multi-celled organisms. Additionally, eukaryotic cells are more than 100 to 10,000 times larger than prokaryotic cells and are much more complex. The DNA in eukaryotes is stored within the nucleus, while DNA is stored in the cytoplasm of prokaryotes.

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Vanshika Tangri 3 years ago

Plz give answer of tge question

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What is acid,base and salt

Posted by Shivaditya Dwivedi 3 years ago

CBSE > Class 09 > Science