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

No products in the cart.

Ask questions which are clear, concise and easy to understand.

Ask Question

The image of an object from by a mirror is real inverted and is of magnification -1 if the image is at a distance of 40 cm from the mirror where is the object place where would the image V if the object is moved 20cm towards the mirror state reason and also draw a diagram of new position of the to justify your answer

Posted by Lipi Nag 4 years, 11 months ago

CBSE > Class 10 > Science

4 answers

Megha Mishra 4 years, 11 months ago

Image will be formed at infinity because. .. In first case, object is at centre of curvature so, image will also be formed at centre of curvature i.e, 40 cm.. 2nd case... when object is moved 20 cm towards mirror, so object will be at 20 cm from mirror that is at focus [ f=2/R] When object is at focus, image will be formed at infinity..

Sumesh ☺️☺️☺️ 4 years, 11 months ago

Agar image 40 cm par banegi to object distance bhi 40 cm hoga, same size ki banegi, or jab object ko 20cm par rakh ge to image 10cm pad

Sumesh ☺️☺️☺️ 4 years, 11 months ago

Wait

Lipi Nag 4 years, 11 months ago

Please aap log iska answer thoda jaldi do

ANSWER

Why nucleus is stable because nucleus have protons and neutrons and neutrons have no charges so protons repell each other (why nucleus stable)

Posted by Basant Singh 4 years, 11 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

State flemming 's right hand rule

Posted by , 🙂 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Aziz Fatima 4 years, 11 months ago

According to Fleming right hand rule if we stretch the thumb , forefinger and the middle finger of right hand such that they are mutually perpendicular to each other , if thumb indicate the direction of force, forefinger indicate the direction of magnetic field then the middle finger will point towards the direction of current.

ANSWER

How a light pass through prism

Posted by Mukesh Yadav 4 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Sia ? 4 years, 6 months ago

When light passes through a prism the light bends. As a result, the different colors that make up white light become separated. This happens because each color has a particular wavelength and each wavelength bends at a different angle.

ANSWER

Name a cyclic unsaturated solution

Posted by Nishchal Mahant 4 years, 11 months ago

CBSE > Class 10 > Science

4 answers

Archana Nair 4 years, 11 months ago

Benzene.

Siddhant Agrawal 4 years, 11 months ago

Answer benzene

Kiran Kumari 4 years, 11 months ago

Benzene

Aziz Fatima 4 years, 11 months ago

Benzene

ANSWER

heating effect of electric current (5 marker)

Posted by Harsh Janghu 4 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Shivam Kumar 4 years, 11 months ago

Heat is directly proportional to square of current , resistance ,and time

Bhoomika Verma 4 years, 11 months ago

When an electric current is passed through a conductor ,the conductor becomes hot after sometime and produce heat . This happens due to the conversion of some electric energy passing through the conductor into heat energy .This effect of electric current is called heating effect of electric current .

ANSWER

A virtual erect and diminised image can be formed by ............... Lens

Posted by Aditi Ringusia 4 years, 11 months ago

CBSE > Class 10 > Science

5 answers

Kiran Kumari 4 years, 11 months ago

Concave lens

Deepak Kariveti 4 years, 11 months ago

Spherical lens

Aayush Dikshit 4 years, 11 months ago

Concave lens

Anu Sharma 4 years, 11 months ago

Concave lens

Aziz Fatima 4 years, 11 months ago

Convex lens

ANSWER

A virtual erect and magnified image can be formed by ................... lens

Posted by Aditi Ringusia 4 years, 11 months ago

CBSE > Class 10 > Science

5 answers

Mukesh Yadav 4 years, 11 months ago

Convex

Bhoomika Verma 4 years, 11 months ago

Convex lens

Harsh Janghu 4 years, 11 months ago

Convex lens is correct

Kiran Kumari 4 years, 11 months ago

Convex lens

Anu Sharma 4 years, 11 months ago

Convex lens : when the object is in between O and F1

ANSWER

A convex mirror used for rear view on an automobile has a radius of curvature 3m. If a bus is located at 5m from this mirror. Find the position, nature, and magnification of image.

Posted by Aditi Ringusia 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Sumesh ☺️☺️☺️ 4 years, 11 months ago

Image distance is 15/13 and magnification is 3/13

ANSWER

An object is placed 18cm in front of a spherical mirror. If the image is formed at 4 cm to the right of the mirror. Calculate its focal length,radius of curvature of the mirror. Is the mirror concave or convex. What is the nature of the image?

Posted by Aditi Ringusia 4 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Sia ? 4 years, 6 months ago

u = - 18 cm
v = 4 cm
1 / f = 1 / v + 1 / u
1 / f = 1 / 4 + 1 / (- 18)
1 / f = 1 / 4 - 1 / 1 8
1 / f = 9 - 2 / 36 = 7 / 36
f = 36 / 7 cm
focal length is positive so mirror is convex.
R = 2 × 36 / 7
= 72 / 7 cm

ANSWER

When an object is placed at a distance of 60cm from a convex mirror the magnification produced is 1/2. Where should object be placed to get a magnification of 1/3?

Posted by Aditi Ringusia 4 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Sia ? 4 years, 6 months ago

ANSWER

The image formed by a convex mirror of focal length 30cm is a quarter of object.what is the distance of the object from the mirror.

Posted by Aditi Ringusia 4 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Sia ? 4 years, 6 months ago

ANSWER

An object is placed 15cm from a convex mirror of radius of curvature 90cm. calculate position of image and its magnification.

Posted by Aditi Ringusia 4 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Sia ? 4 years, 6 months ago

radius of curvature = 90 cm
focal length = r/2 = +45 cm(since it is on the direction on the incident light)
object distance, u = - 15 cm (since it is on the opposite direction of the incident light)
we have to find v= ?
using mirror formula we get ,
1/v + 1/u = 1/f
so 1/ v = 1/f - 1/u
1/v = 1/ 45 - (1/-15) = 1/45 + 1/15 = 4/45
so v =45 / 4 cm
therefore image distance = 45 / 4 cm (positive sice it is in the direction of incident light)

ANSWER

An object is placed at a large distance in front of a convex mirror of radius if curvature 40cm. How far is the image behind the mirror.

Posted by Aditi Ringusia 4 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Sia ? 4 years, 6 months ago

Large distance =infinity

The image will form on principle focus of convex mirror because rays coming from infinity when touch mirror get diverged but virtually they meet at principle focus

Radius of curvature=40cm

Focal length=Radius of curvature/2

f=40/2

f=20cm

ANSWER

State 1 basic difference between physical and chemical change

Posted by Jathin Tm 4 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Prachi Sinha 4 years, 11 months ago

Yes

Harsh Janghu 4 years, 11 months ago

Physical changes are reversible whereas chemical changes are not

Raghav 10Ai 4 years, 11 months ago

Physical change do not involve chemical reaction Chemical reaction involve chemical reaction

ANSWER

object 50 cm tall is placed on the principal axis of a convex lens it 2012 image is formed on the screen placed at a distance of 10cm from the lens calculate the focal length of the

Posted by Aman Kumar 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Sumesh ☺️☺️☺️ 4 years, 11 months ago

Can you again check your question plz,

ANSWER

Formula diary

Posted by Shubham Singh 4 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Aditi Ringusia 4 years, 11 months ago

Me too!

Secret ??? 4 years, 11 months ago

I want too!! Of Maths and physics

ANSWER

What condition necessary for photosynthesis ?

Posted by Rohit Sain 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Secret ??? 4 years, 11 months ago

# Adequate sunlight # water # Chlorophyll # Carbon dioxide

ANSWER

Explain the process of breathinh in human beings

Posted by Pulkit Upadhyay 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Secret ??? 4 years, 11 months ago

Humans respires or breath through a pair of lungs. During inhalation chest cavity goes forward and downwards and inhalation, the diaphragm contracts and flattens and the chest cavity enlarges. This contraction creates a vacuum, which pulls air into the lungs. During exhalation, chest cavity goes backwards and upwards and the diaphragm relaxes and returns to its domelike shape, and air is forced out of the lungs.

ANSWER

Write down the properties of covalent bond in carbon compound.

Posted by Baisa Hkm ?? 4 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Secret ??? 4 years, 11 months ago

There are properties covalent compounds, properties of elements are not given especially.

Baisa Hkm ?? 4 years, 11 months ago

plz give me satisfing answer

Anant Raj 4 years, 11 months ago

Sharing of electrons may be 1 2 or 3 . Sign of chemical bonding is given as -

ANSWER

Sustainability of natural resources

Posted by Shristi Patnaya Patnayak 4 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Sia ? 4 years, 6 months ago

Natural resources exist naturally without any human intervention. It can be renewed, replenished easily, and some non-renewable ones, which cannot be replenished.

ANSWER

Define photosynthesis and write all step during photosynthesis

Posted by Ankit Chaudhary 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Somya Singh 4 years, 11 months ago

Photosynthesis is a process performed by autotrophs by reacting carbon dioxide with water in the presence of sunlight absorbed by chlorophyll to form glucose and evolve oxygen Steps: 1 absorption of sunlight by chlorophyll 2 conversion of light energy into chemical energy and splitting of water into hydrogen and oxygen 3 reduction of carbon dioxide to carbohydrates

ANSWER

I want solved physics practical for readings ammeter-0-3.5 and voltmeter-0-14

Posted by Yashasvi Rai 4 years, 11 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Sound of our heart beat

Posted by Rohit Sain 4 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Misty Chan 4 years, 11 months ago

Pklepoopopoopkleoopppoo This sound heart makes

Rohit Sain 4 years, 11 months ago

Thanks

Teresa Singh ✌🏻 4 years, 11 months ago

lup-dup sound. These sounds are due to the closing of the valves of the heart. Unusual heart sounds are called murmurs.

ANSWER

In the working of electric motor, the magnetic field produced by the magnetic poles makes the current go in upward direction in arm AB of the coil but, why so??

Posted by Saba Urooj 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Somya Singh 4 years, 11 months ago

Apply Fleming left hand rule

ANSWER

Calculate the speed of light in given media on page no.175 of science ncert book and observe it's speed , what we conclude from this?

Posted by Pranali Solanke 4 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Somya Singh 4 years, 11 months ago

Please cross check the page no. again

Pranali Solanke 4 years, 11 months ago

Oo bhai answer nhi aata na to chup raha karo plz?

Gourav Rathod 4 years, 11 months ago

Hsushd

ANSWER

Q. Calculate the speed of light in given medium and observe its speed, what we conclude from this ?

Posted by Pranali Solanke 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Shravan Patil 4 years, 11 months ago

The speed of light in a medium is v=cn v = c n , where n is its index of refraction. If we divide both sides of equation c = fλ by n, we get cn=v=fλn c n = v = f λ n .

ANSWER

What is DNA

Posted by Pratima Kumari 4 years, 11 months ago

CBSE > Class 10 > Science

5 answers

Tanu Kuhar 4 years, 11 months ago

DNA ( deoxy ribonuclic) is a genetic material present in chromosome and it carry information for next generation

Somya Singh 4 years, 11 months ago

The DNA in the cell nucleus is the information source for making protein

Rohit Sain 4 years, 11 months ago

You are right Vijay Kansara

Vijay Kansara 4 years, 11 months ago

its de-oxyribose nucleic acid

Shravan Patil 4 years, 11 months ago

Deoxic Nucleic Acid

ANSWER

PROJECT (PHYSICS) - COMPARATIVE STUDYOF ALTERNATIVE SOURCES OF ENERGY IN UTTARAKHANDAND KARNATAKA

Posted by Deemanth Srinath 4 years, 11 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Chapter 2 The human eye and the colourful world me kya kya pdhna h plz koi bta do

Posted by Pihu ✨ 4 years, 11 months ago

CBSE > Class 10 > Science

4 answers

Subham Gite 4 years, 11 months ago

The function of human eyes working lens and retina how they work in our eyes and what reason why people faces and wear goggles and what are importance for eye

Kritika Rajpal 4 years, 11 months ago

Refraction through glass prism, atmospheric refraction, scattering of light, formation of rainbow :-)

Aditi Ringusia 4 years, 11 months ago

Functions of lens in human eye, defects of vision and their corrections, applications of spherical mirrors and lenses.... These topics are cut.

Neel Menghani 4 years, 11 months ago

Pg 187, 188, 189, 190 are cut

ANSWER

Page 179 of 2763

myCBSEguide App

myCBSEguide

Trusted by 1 Crore+ Students

Test Generator

Test Generator

Create papers online. It's FREE.

CUET Mock Tests

CUET Mock Tests

75,000+ questions to practice only on myCBSEguide app

Google Play

Download myCBSEguide App