CBSE X Questions

We wish to obtain an equal sized inverted image of a candle flame on a screen

Reflection & Refraction (C10)

We wish to obtain an equal sized inverted image of a candle flame on a screen kept at distance of 4 m from the candle flame.

Name the type of lens that should be used.
What should be the focal length of the lens and at what distance from the candle flame the lens be placed.
Draw a labelled diagram to show the image formation in this case.

A 5 cm tall object is placed at a distance of 30 cm from a convex mirror

Reflection & Refraction (C10)

A 5 cm tall object is placed at a distance of 30 cm from a convex mirror of focal length 15 cm. Find the position, size and nature of the image formed.

What is electrical resistivity? Derive its SI unit

Electricity (C10)

What is electrical resistivity? Derive its SI unit. In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 100 mA. If the length of the wire is doubled, how will the current in the circuit change? Justify your answer.

What would be the readings of the ammeter and the voltmeter

Electricity (C10)

Consider the following circuit:

What would be the readings of the ammeter and the voltmeter when key is closed? Give reason to justify your answers.

Calculate the total cost of running the following electrical devices

Electricity (C10)

Calculate the total cost of running the following electrical devices in the month of September, if the rate of 1 unit of electricity is Rs 6.00.

Electric heater of 1000 W for 5 hours daily.
Electric refrigerator of 400 W for 10 hours daily.

Improvements in our lifestyle have resulted in greater amounts of waste generation

Management of Natural Resources (C10)

"Improvements in our lifestyle have resulted in greater amounts of waste generation." Give two examples to support the given statement. Suggest one change that we can incorporate in our lifestyle in order to reduce non biodegradable waste.

What do you understand by Watershed Management

Management of Natural Resources (C10)

What do you understand by "Watershed Management"? List any two advantages of watershed management.

What is “Sustainable Management of Natural Resources”

Management of Natural Resources (C10)

What is “Sustainable Management of Natural Resources”? Why is it necessary? Which one out of reuse and recycle, would you practise in your daily life and why?

State ways to prevent the rusting of iron

Metals & Non-metals (C10)

State two ways to prevent the rusting of iron.

What is reactivity series

Metals & Non-metals (C10)

What is reactivity series? How does the reactivity series of metals help in predicting the relative activities of various metals?

Suggest different chemical processes used for obtaining a metal from its oxides

Metals & Non-metals (C10)

Suggest different chemical processes used for obtaining a metal from its oxides for metals in the middle of the reactivity series and metals towards the top of the reactivity series. Support your answer with one example each.

List in tabular form chemical properties on the basis of which

Metals & Non-metals (C10)

List in tabular form any three chemical properties on the basis of which metals and non-metals are differentiated.

What was the basis of Mandelẽev’s classification of elements

Periodic Classification of Elements (C10)

(a) What was the basis of Mandelẽev’s classification of elements?

(b) List two achievements of Mandelẽev’s periodic tables.

Write Number Of Periods And Groups In Modern Periodic Table

Periodic Classification of Elements (C10)

Write the number of periods and groups in the Modern Periodic Table. How does the metallic character of elements vary on moving (i) from left to right in a period, and (ii) down a group? Give reason to justify your answer.

Na, Mg and Al Are Elements Of 3rd Period

Periodic Classification of Elements (C10)

Na, Mg and Al are the elements of the 3^rd period of the Modern Periodic Table having group number 1, 2 and 13 respectively. Which one of these elements has the (a) highest valency, (b) largest atomic radius, and (c) maximum chemical reactivity? Justify your answer stating the reason for each.

Differentiate between the arrangement of elements in Mendeleev’s periodic table

Periodic Classification of Elements (C10)

Differentiate between the arrangement of elements in Mendeleev’s periodic table and Modern periodic table.

Explain giving justification the trends in the following properties of elements

Periodic Classification of Elements (C10)

Explain giving justification the trends in the following properties of elements, on moving from left to right in a period, in the Modern periodic Table.

Variation of valency.
Change of atomic radius.
Metallic to non-metallic character.
Electronegative character.
Nature of oxides.

Write the mechanism by which fishes breath in water

Life Processes (C10)

Write the mechanism by which fishes breath in water.

Name the balloon likes structures present in lungs

Life Processes (C10)

Name the balloon likes structures present in lungs. List its two functions.

Name the respiratory pigment and write its role in human beings

Life Processes (C10)

Name the respiratory pigment and write its role in human beings.

Explain the ways in which glucose is broken down in absence of oxygen

Life Processes (C10)

Explain the ways in which glucose is broken down in absence of oxygen.

List differences between arteries and veins

Life Processes (C10)

List three differences between arteries and veins.

Name the process and explain the type of nutrition found in green plants

Life Processes (C10)

(a) Name the process and explain the type of nutrition found in green plants. List the raw materials required for this process. Give chemical equation for the mentioned process.

(b) Write three events that occur during this process.

Explain how, offspring and parents of organisms

Reproduction (C10)

Explain how, offspring and parents of organisms reproducing sexually have the same number of chromosomes.

Give an example of a flower which contains both stamens and carpels

Reproduction (C10)

Give an example of a flower which contains both stamens and carpels.

List Three Techniques To Prevent Pregnancy

Reproduction (C10)

List three techniques that have been developed to prevent pregnancy. Which one of these techniques is not meant for males? How does the use of these techniques have a direct impact on the health and prosperity of a family?

What Is Vegetative Propagation

Reproduction (C10)

What is vegetative propagation? State two advantages and two disadvantages of this method.

What is variation? How is variation created in a population

Reproduction (C10)

What is variation? How is variation created in a population? How does the creation of variation in a species promote survival?

Why does the sun appear reddish early in the morning

Human Eye & Colourful World (C10)

Why does the sun appear reddish early in the morning? Will this phenomenon be observed by an astronaut on the Moon? Give reason to justify your answer.

Noopur needs a lens of power -4.5D for correction of her vision

Human Eye & Colourful World (C10)

Noopur needs a lens of power -4.5D for correction of her vision.

What kind of defect in vision is she suffering from?
What is the focal length and nature of the corrective lens?
Draw ray diagrams showing the (a) defected eye and (b) correction for this defect.
What are the causes of this defect?

Draw a path of light ray passing through a prism

Draw a path of light ray passing through a prism. Label angle of incidence and angle of deviation in the ray diagram.

State Cause Of Dispersion Of White Light By Glass Prism

Human Eye & Colourful World (C10)

State the cause of dispersion of white light by a glass prism. How did Newton, using two identical glass prisms, show that white light is made of seven colours? Draw a ray diagram to show the path of a narrow beam of white light, through a combination of two identical prisms arranged together in inverted position with respect to each other, when it is allowed to fall obliquely on one of the faces of the first prism of the combination.

What is presbyopia? State its cause. How is it corrected

Human Eye & Colourful World (C10)

What is presbyopia? State its cause. How is it corrected?

What are magnetic field lines? How is the direction of magnetic field

Magnetic Effects (C10)

(a) What are magnetic field lines? How is the direction of magnetic field at a point in a magnetic field determined using field lines?

(b) Two circular coils ‘X’ and ‘Y’ are placed close to each other. If the current in the coil ‘X’ is changed, will some current be induced in the coil ‘Y’? Give reason.

Draw a labelled diagram of the experimental set up for the study of liberation of carbon dioxide

Science Practical (C10)

Draw a labelled diagram of the experimental set up for the study of liberation of carbon dioxide gas during respiration.

In a school laboratory the students are studying the properties of ethanoic acid

Science Practical (C10)

In a school laboratory the students are studying the properties of ethanoic acid through certain experiments. How can they test its acidic nature ? Give two tests.

In the laboratory of a school, the sample of hard water is not available

Science Practical (C10)

In the laboratory of a school, the sample of hard water is not available “to study the comparative cleaning capacity of a sample of soap in soft and hard water”. Which salt from the laboratory can be added to tap water to make it hard ? In the experiment how is cleaning capacity of soap compared ?

People who smoke are being hounded out of all public places

Reading (C10)

Read the passage given below:

People who smoke are being hounded out of all public places - offices, restaurants, educational institutions, buses, trains etc. Away from home now it is becoming nearly impossible to find a place to smoke. Growing restrictions and the fear of various diseases caused by tobacco are prompting many smokers to stop smoking. 19 states in the U.S. have made laws against smoking.

Thornfield Hall was a large gentleman’s house in the country

Reading (C10)

Read the passage given below and answer any eight of the questions that follow:

Thornfield Hall was a large gentleman’s house in the country, near a town called Millcote. There, after my sixteen-hour journey, I was welcomed by Mrs. Fairfax. She was a little old lady, dressed in black, who seemed glad to have someone else to talk to, apart from the servants. Although the house was dark and frightening, with its big rooms full of heavy furniture, I was excited at being in a new place, and looked forward to my new life there, working for kind Mrs. Fairfax.

Attempt a character sketch of Gilman

Story of My Life (C10)

Attempt a character sketch of Gilman.

Describe Helen Keller’s experience at Radcliffe

Story of My Life (C10)

Describe Helen Keller’s experience at Radcliffe.

Attempt a character sketch of Margot

Diary of Young Girl (C10)

Attempt a character sketch of Margot.

How does Anne Frank mature and develop through the course of her diary

Diary of Young Girl (C10)

How does Anne Frank mature and develop through the course of her diary?

Animal life is as sacred as human life. Describe how ancient mariner and other sailors suffered

Literature Reader (C10)

Animal life is as sacred as human life. Describe how ancient mariner and other sailors suffered because the ancient mariner had killed the albatross.

To lead a happy married life there must be trust between husband and wife

Literature Reader (C10)

To lead a happy married life there must be trust between husband and wife. Why did Lavinia decide to leave her husband and why did she later on change her decision?