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

Height of object(ho)= 10cm Object distance (u) = -5cm Focal length (f)= -20 cm By using mirror formula, 1/f= 1/v+1/u 1/-20= 1/v+1/-5 1/-20 -1/-5 = 1/v -1+4/20 = 1/v 3/20 = 1/v 6.66 cm = v m = -(v/u) = hi / ho -(6.66/-5) = hi /10 -666/500 = hi/10 -6660/500 = hi -666/50 = hi -13.32 cm = hi

0Thank You

Rasheeda Ibrahim 1 week, 4 days ago

1Thank You

ANSWER

Ravi is given lenses with power +5d, -5d, +10d, -10d and -20d. Considering a pair of lenses at a time, which two lenses will he select to have a combination of total focal length when two lenses are kept in contact in each case. 1. -10cm. 2. 20cm. 3. -20cm.

Posted by Yash Singh Bharara 1 week, 5 days ago

CBSE > Class 10 > Science

1 answers

Parul Ailawadi 20 hours ago

1. Don't know 2. -5d, +10d P=-5+10=5d f=100/P=100/5=20cm 3. +5d, -10d P=+5-10=-5d f=100/P=100/-5=-20cm

0Thank You

ANSWER

Define the principal focus of a concave mirror

Posted by Ankita Pujari 1 week, 5 days ago

CBSE > Class 10 > Science

3 answers

Dhiraj Kumar Mahto 1 week, 5 days ago

The principal focus of a concave mirror is the specific point where parallel rays of light converge or appear to converge after reflection.

0Thank You

Yash Singh Bharara 1 week, 5 days ago

The principal focus of a concave mirror is the specific point where parallel rays of light converge or appear to converge after reflection.

0Thank You

Aishwari Jaiswal 1 week, 5 days ago

I don't know

0Thank You

ANSWER

Find Biodegradable waste- empty packet of chips, empty plastic bottle of water, empty paper box of sweets, empty ton of cold drink

Posted by Rajneesh Nyol 1 week, 5 days ago

CBSE > Class 10 > Science

1 answers

Yash Singh Bharara 1 week, 5 days ago

The empty paper box of sweets is biodegradable because it's made of paper, which can break down naturally. The empty plastic bottle of water and the empty can of cold drink are not biodegradable, while the biodegradability of the empty packet of chips depends on its material.

0Thank You

ANSWER

When green coloured crystals of a salt x is heated strongly then gas by with pungent smell is released identify x and y give chemical equation

Posted by Ujjwal Kumar 1 week, 5 days ago

CBSE > Class 10 > Science

1 answers

Yash Singh Bharara 1 week, 5 days ago

The salt \(X\) is likely ammonium dichromate, \((NH_4)_2Cr_2O_7\), which is orange, but it turns green when it decomposes. When heated, it undergoes a decomposition reaction to produce chromium(III) oxide (\(Cr_2O_3\)), nitrogen gas (\(N_2\)), and water vapor (\(H_2O\)). The green-colored substance is chromium(III) oxide, and the gas with a pungent smell is nitrogen dioxide (\(NO_2\)) which is usually formed due to secondary reactions. The decomposition reaction of ammonium dichromate can be represented by the following chemical equation: \[ (NH_4)_2Cr_2O_7 \rightarrow Cr_2O_3 + N_2 + 4H_2O \] During the heating process, some \(NH_3\) may be released, which can further oxidize to \(NO_2\) in the presence of heat and oxygen. So, the salt \(X\) is ammonium dichromate, \((NH_4)_2Cr_2O_7\), and the gas \(Y\) is nitrogen dioxide, \(NO_2\). Here is the full balanced chemical equation: \[ (NH_4)_2Cr_2O_7 \rightarrow Cr_2O_3 + N_2 + 4H_2O \] When considering secondary reactions for the release of \(NO_2\): \[ 4NH_3 + 7O_2 \rightarrow 4NO_2 + 6H_2O \]

0Thank You

ANSWER

50 + transportation heart question answers class 10th biology

Posted by Kirti Panchole 1 week, 6 days ago

CBSE > Class 10 > Science

1 answers

Kirti Panchole 1 week, 6 days ago

50 + transportation (heart) question answer

0Thank You

ANSWER

Explain nutrition in amoeba

Posted by Saad Gauri 2 weeks ago

CBSE > Class 10 > Science

2 answers

Gautam Jha Jha 3 days, 21 hours ago

By the process of diffusion

0Thank You

Yash Singh Bharara 1 week, 5 days ago

Amoeba obtains nutrition by engulfing food particles through phagocytosis, digesting them in food vacuoles with enzymes, absorbing the resulting nutrients, and expelling undigested material.

0Thank You

ANSWER

Why and how does water enter continuously into the root xylem?

Posted by Saloni Singh 1 week, 6 days ago

CBSE > Class 10 > Science

0 answers

ANSWER

How do living organisms obtain nutrients from their food

Posted by Raquibul Hoda 2 weeks ago

CBSE > Class 10 > Science

1 answers

Riya Kushwaha 2 weeks ago

Respiration is the process by which living organisms obtain nutrients from their food...

1Thank You

ANSWER

I need extra notes of photosynthesis

Posted by Latika Kumari 2 weeks, 1 day ago

CBSE > Class 10 > Science

1 answers

Siddhi Tiwari 2 weeks, 1 day ago

What is the function of digestive enzymes

8Thank You

ANSWER

2. What is double displacement reaction?

Posted by Brishti Rani Chetia 2 weeks, 2 days ago

CBSE > Class 10 > Science

3 answers

Account Deleted 1 week, 2 days ago

Reaction in which the reactants and product interchange their corresponding ions

0Thank You

Sameer Ansari 1 week, 3 days ago

It is teaction on which change of ions

0Thank You

Agrim Naagar 2 weeks, 1 day ago

It's a type of reaction in which both reactant interchange their 2 nd terms

0Thank You

ANSWER

What is reactants and products. Give an example

Posted by Brishti Rani Chetia 2 weeks, 2 days ago

CBSE > Class 10 > Science

2 answers

Guri Sidhu 1 week, 2 days ago

Those substance which take place in chemical reaction are called reactant and on the other hand the new substance produced in a chemical reaction called product Example Magnesium+oxygen --> magnesium oxide (product) (Reactant)

0Thank You

Krish Gupta Gupta 2 weeks, 1 day ago

0Thank You

ANSWER

With chemical process maintain our body temperature

Posted by Vicky Kashyap 2 weeks, 2 days ago

CBSE > Class 10 > Science

0 answers

ANSWER

How much energy is given to each coulomb of charge passing through a 6V battery ?

Posted by Neeraj Thakran 2 weeks, 2 days ago

CBSE > Class 10 > Science

1 answers

Parul Ailawadi 20 hours ago

V=W/Q 6=W/1 W=6J

0Thank You

ANSWER

What is homologous?

Posted by Radhika Joshi 2 weeks, 3 days ago

CBSE > Class 10 > Science

0 answers

ANSWER

This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

Few rules to keep homework help section safe, clean and informative.

Don't post personal information, mobile numbers and other details.
Don't use this platform for chatting, social networking and making friends. This platform is meant only for asking subject specific and study related questions.
Be nice and polite and avoid rude and abusive language. Avoid inappropriate language and attention, vulgar terms and anything sexually suggestive. Avoid harassment and bullying.
Ask specific question which are clear and concise.

Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions.

Posted by Benito Mathew Boby 1 week, 3 days ago

CBSE > Class 10 > Science

1 answers

G Adithya G Adithya 2 weeks, 2 days ago

In 1st chapter questions on your own

0Thank You

ANSWER

Define photosynthesis and it's equation

Posted by Pusha Chouhan 2 weeks, 3 days ago

CBSE > Class 10 > Science

1 answers

Account Deleted 1 week, 2 days ago

Photosynthesis is a process through which green plants prepare their own food with the help of raw materials i.e , sunlight, carbon dioxide 6Co2+12H20-----> (sunlight and chlorophyll) C6H12O6 +6O2+6H20

0Thank You

ANSWER

Flow chart of type of reaction

Posted by Grish Tanwar 2 weeks, 3 days ago

CBSE > Class 10 > Science