CBSE X Questions
Draw the structural formulae of all the possible isomers of C3H6O
Draw the structural formulae of all the possible isomers of the compound with the molecular formula C3H6O and also give their electron dot structures.
Read more …Name the process by which an amoeba reproduces
Name the process by which an amoeba reproduces. Draw the various stages of its reproduction in a proper sequence.
Read more …A student observed a permanent slide showing asexual reproduction in yeast
A student observed a permanent slide showing asexual reproduction in yeast. Draw diagrams of the observations he must have made from the slide. Name the process also.
Read more …You are given balls and stick model of six carbon atoms and fourteen hydrogen atoms
You are given balls and stick model of six carbon atoms and fourteen hydrogen atoms and sufficient number of sticks. In how many ways one can join the models of six carbon atoms and fourteen hydrogen atoms to form different molecules of C6H14.
Read more …Name the electric device that converts mechanical energy into electrical energy
Name the electric device that converts mechanical energy into electrical energy. Draw the labelled diagram and explain the principle involved in this device.
Read more …Draw a circuit diagram of an electric circuit containing a cell
Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 4Ω in series with a combination of two resistors (8Ω each) in parallel and a voltmeter across parallel combination. Each of them dissipate maximum energy and can withstand a maximum power of 16W without melting. Find the maximum current that can flow through the three resistors.
Read more …With the help of a labelled circuit diagram wire describe an activity
With the help of a labelled circuit diagram wire describe an activity to illustrate the pattern of the magnetic field lines around a straight current carrying long conducting wire.
- Name the rule that is used to find the direction of magnetic field associated with a current carrying conductor.
- Is there a similar magnetic field produced around a thin beam of moving (a) alpha particles and (b) neutrons? Justify your answer.
In given figure ∠1 = ∠2 and ΔNSQ ≅ ΔMTR , then prove that ΔPTS ~ ΔPRQ
In given figure ∠1 = ∠2 and ΔNSQ ≅ ΔMTR , then prove that ΔPTS ~ ΔPRQ.
Write two observations when lead nitrate is heated in a test tube
(i) Write two observations when lead nitrate is heated in a test tube.
(ii) Name the type of reaction.
(iii) Write a balanced chemical equation to represent the above reaction.
Read more …A compound X of sodium is used as an antacid
A compound ‘X’ of sodium is used as an antacid and it decomposes on strong heating.
- Name the compound ‘X’ and give its chemical formula.
- Write a balanced chemical equation to represent the decomposition of ‘X’.
- Give one use of compound ‘X’ besides an antacid.
You are provided with 90 mL of distilled water
You are provided with 90 mL of distilled water and 10 mL of concentrated sulphuric acid to prepare dilute sulphuric acid.
- What is the correct way of preparing dilute sulphuric acid? Give reason.
- How will the concentration of H3O+ ions change on dilution?
Two elements X and Y have atomic numbers 12 and 16 respectively
Two elements X and Y have atomic numbers 12 and 16 respectively. To which period of the modern periodic table do these two elements belong? What type of bond will be formed between them and why? Also give the chemical formula of the compound formed.
Read more …Create a terrestrial food chain depicting four trophic levels
(i) Create a terrestrial food chain depicting four trophic levels.
(ii) Why do we not find food chains of more than four trophic levels in nature?
Read more …How will you create an artificial aquatic ecosystem
How will you create an artificial aquatic ecosystem, which is self-sustainable?
Read more …Explain giving reasons the bending of the shoot tip of a plant
Explain giving reasons the bending of the shoot tip of a plant towards light source coming from one side of the plant.
Read more …It is desired to obtain an erect image of an object
It is desired to obtain an erect image of an object, using concave mirror of focal length of 12 cm.
- What should be the range of the object distance in the above case?
- Will the image be smaller or larger than the object? Draw a ray diagram to show the formation of image in this case.
- Where will the image of this object be, if it is placed 24 cm in front of the mirror?
A narrow beam of white light is shown to pass through a triangular glass prism
In the figure given below, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a spectrum XY on the screen.
- Name the phenomenon.
- State the colours seen at X and Y.
- Why do different colours of white light bend at different angles through a prism?
What is visible spectrum
(i) What is visible spectrum?
(ii) Why is red used as the stopping light at traffic signals?
(iii) Two triangular glass prisms are kept together connected through their rectangular side. A light beam is passed through one side of the combination. Will there be any dispersion? Justify your answer.
Read more …Metal X is found in nature as its sulphide XS
Metal X is found in nature as its sulphide XS. It is used in the galvanisation of iron articles. Identify the metal X. How will you convert this sulphide ore into the metal? Explain with equations.
Read more …Sodium or potassium metals are kept immersed under kerosene
State the reason for the following: Sodium or potassium metals are kept immersed under kerosene.
Read more …Calcium does not occur in free state in nature
State the reason for the following: Calcium does not occur in free state in nature.
Read more …Hydrogen gas is not evolved when most metals react with nitric acid
State the reason for the following: Hydrogen gas is not evolved when most metals react with nitric acid.
Read more …An iron strip dipped in a blue copper sulphate solution
State the reason for the following: An iron strip dipped in a blue copper sulphate solution turns the blue solution pale green.
Read more …Aluminium oxide is called an amphoteric oxide
State the reason for the following: Aluminium oxide is called an amphoteric oxide.
Read more …The formulae of four organic compounds are
The formulae of four organic compounds are given below:
- A: C2H4
- B: CH3COOH
- C: C2H5OH
- D: C2H6
Conductor is cut into four equal parts. What will be the new resistivity
(i) Consider a conductor of resistance ‘R’, length ‘L’, thickness ‘d’ and resistivity ‘ρ’. Now this conductor is cut into four equal parts. What will be the new resistivity of each of these parts? Why?
Read more …Describe the role of Alluri Sitaram Raju in Andhra Pradesh
Describe the role of Alluri Sitaram Raju in Andhra Pradesh during 1920s.
Read more …Describe the incidence of Jallianwala Bagh Massacre
Describe the incidence of Jallianwala Bagh Massacre.
Read more …Why did merchants moved to the countryside Europe
Why did merchants moved to the countryside Europe during the seventeenth and eighteenth centuries? Explain.
Read more …Why did Europeans flee to America in nineteenth century
Why did Europeans flee to America in nineteenth century? Explain.
Read more …India has fairly rich and varied mineral resources
"India has fairly rich and varied mineral resources across different regions". Support the statement with examples.
Read more …Energy saved is energy produced
"Energy saved is energy produced". Support the statement with suitable examples.
Read more …Describe any three features of Indian Federalism
Describe any three features of Indian Federalism.
Read more …Describe the role of Political Parties in India
Describe the role of Political Parties in India.
Read more …Why do banks and cooperative societies need to lend more
Why do banks and cooperative societies need to lend more? Explain.
Read more …Why do we need to expand formal sources of credit in India
Why do we need to expand formal sources of credit in India? Explain.
Read more …Underemployment continues to be rampant in the rural areas
Underemployment continues to be rampant in the rural areas. Suggest any three ways through which employment for rural people can be generated.
Read more …Why was the period of 1848 considered as phase of the revolution of the Liberals in Europe
Why was the period of 1848 considered as phase of the revolution of the Liberals in Europe? Explain.
Read more …Highlight the reasons for the growth of nationalist tensions in the Balkan region
Highlight the reasons for the growth of nationalist tensions in the Balkan region before the First World War.
Read more …The challenge of sustainable development requires control over industrial pollution
‘The challenge of sustainable development requires control over industrial pollution.’ Substantiate the statement with examples.
Read more …Explain the accommodative experience of Belgium for peace and harmony
Explain with examples the accommodative experience of Belgium for peace and harmony.
Read more …Democracy is based on the idea of deliberation and negotiation
‘Democracy is based on the idea of deliberation and negotiation’. Examine the statement.
Read more …Respect and equal treatment of women are necessary ingredients
‘Respect and equal treatment of women are necessary ingredients of a democratic society’. Examine the statement.
Read more …Describe the role of technology in promoting globalisation process
Describe the role of technology in promoting globalisation process.
Read more …How does valency of an element vary across a period?
How does valency of an element vary across a period?
Read more …A lens produces a magnification of -0.5. Is this a converging or diverging lens?
A lens produces a magnification of -0.5. Is this a converging or diverging lens? If the focal length of the lens is 6 cm, draw a ray diagram showing the image formation in this case.
Read more …A girl was playing with a thin beam of light from a laser torch
A girl was playing with a thin beam of light from a laser torch by directing it from different directions on a convex lens held vertically. She was surprised to see that in a particular direction, the beam of light continues to move along the same direction after passing through the lens. State the reason for her observation. Draw a ray diagram to support your answer.
Read more …On entering in a medium from air, the speed of light becomes half
On entering in a medium from air, the speed of light becomes half of its value in air. Find the refractive index of that medium with respect to air?
Read more …A glass slab made of a material of refractive index n1
A glass slab made of a material of refractive index n1 is kept in a medium of refractive index n2. A light ray is incident on the slab. Draw the path of the rays of light emerging from the glass slab, if (i) n1 > n2 (ii) n1 = n2 (iii) n1 < n2
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