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CBSE Questions

Total Questions 9982
Explain the ideas of Phan Chu Trinh to establish a democratic republic in Vietnam.
What are hydrocarbons ? Distinguish alkanes from alkenes and each of them from alkynes, giving one example of each. Draw the structure of each compound cited as example to justify your answer.
The linear magnification produced by a spherical mirror is +1/3 Analysing this value state the (i) type of mirror and (ii) position of the object with respect to the pole of the mirror. Draw ray diagram to justify your answer.
One student uses a lens of focal length +50 cm and another of –50 cm. State the nature and find the power of each lens. Which of the two lenses will always give a virtual, erect and diminished image irrespective of the position of the object ?
A student wants to obtain an erect image of an object using a concave mirror of 12 cm focal length. What should be the range of distance of the object from the mirror ? State the nature and size of the image he is likely to observe. Draw a ray diagram to justify your answer.
Why do mice whose tails were surgically removed just after birth for generations, continue to produce mice with tails ?
Why is the progeny always tall when a tall pea plant is crossed with a short pea plant ?
Define the term ‘evolution’. ‘‘Evolution should not be equated with progress.’’ Give reason to justify this statement.
The image of a candle flame placed at a distance of 40 cm from a spherical lens is formed on a screen placed on the other side of the lens at a distance of 40 cm from the lens. Identify the type of lens and write its focal length. What will be the nature of the image formed if the candle flame is shifted 25 cm towards the lens ? Draw a ray diagram to justify your answer.
A student has a concave mirror of 20 cm focal length and he wants to see an erect image of his face in the mirror. What should be the range of distance of the mirror from his face ? State the nature and size of the image he is likely to observe. Draw a ray diagram to justify your answer.
The linear magnification produced by a spherical mirror is –1/5. Analysing this value state the (i) type of spherical mirror and (ii) the position of the object with respect to the pole of the mirror. Draw ray diagram to justify your answer.
Explain with an example how one can use the ‘Right to Seek Redressal’ against unfair trade practices and exploitation.
Describe the role of merchants and industrialists in the Civil Disobedience Movement.
Who wrote the ‘History of the Loss of Vietnam’ ?
Explain with an example, how credit plays a vital and positive role for development.
Why did Gandhiji decide to launch a nationwide Satyagraha against the proposed Rowlatt Act, 1919 ? Explain.
What inspiration do we get from Bolivia’s popular struggle ? Explain any three values that we can learn from it.
How is democractic government known as responsive government ? Explain with examples.
In which year W.G Grace invented Cricket.
Name the father of American football.