CBSE X Questions
Write the principle of working of an electric motor
Write the principle of working of an electric motor. Explain the function of the following parts of an electric motor:
- Armature
- Brushes
- Split ring
What is observed when a solution of sodium sulphate is added to a solution of barium chloride
What is observed when a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube? Write equation for the chemical reaction involved and name the type of reaction in this case.
Read more …A student added few pieces of aluminium metal to two test tubes
A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.
In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.
Read more …An object of height 4.0 cm is placed at a distance of 30 cm
An object of height 4.0 cm is placed at a distance of 30 cm from the optical centre ‘O’ of a convex lens of focal length 20 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre ‘O’ and principal focus ‘F’ on the diagram. Also find the approximate ratio of size of the image to the size of the object.
Read more …List the steps of preparation of temporary mount of a leaf peel
List the steps of preparation of temporary mount of a leaf peel to observe stomata?
Read more …How does the story ‘Two Gentlemen of Verona’ give hope to the society
How does the story ‘Two Gentlemen of Verona’ give hope to the society?
Read more …What message is conveyed through the poem ‘The Frog and the Nightingale’
What message is conveyed by Vikram Seth through the poem ‘The Frog and the Nightingale’?
Read more …Why was the Writer’s inspiration Bureau formed
Why was the Writer’s inspiration Bureau formed?
Read more …Although Calpurnia revealed her fear after nightmare yet Caesar decided to go
Although Calpurnia revealed her fear after nightmare yet Caesar decided to go to senate house. Why?
Read more …What did Patol Babu remember when he got the proposal to act in film
What did Patol Babu remember when he got the proposal to act in film?
Read more …How did the poet feel after throwing a log at the snake
How did the poet feel after throwing a log at the snake?
Read more …What did the sculptor want to portray through the statue of Ozymandias
What did the sculptor want to portray through the statue of Ozymandias?
Read more …Why had Lavinia brought the Ouija Board for John
Why had Lavinia brought the Ouija Board for John?
Read more …How can you say that Michael and his father had a passion for computer games
How can you say that Michael and his father had a passion for computer games?
Read more …What prophecy does Antony make by the side of Caesar’s body
What prophecy does Antony make by the side of Caesar’s body?
Read more …Who was Gogon Pakrashi? What did he preach Patol Babu?
Who was Gogon Pakrashi? What did he preach Patol Babu?
Read more …Give a brief character sketch of Mr. Otto Frank
Give a brief character sketch of Mr. Otto Frank.
Read more …Getting admission into college wasn’t easy for Helen
Getting admission into college wasn’t easy for Helen. Moreover, she encountered a lot of problems while studying there. Bring out her problems.
Read more …Miss Sullivan played a very important part in Helen’s life
Miss Sullivan played a very important part in Helen’s life. Discuss with reference to the novel.
Read more …Discuss briefly the character sketch of Peter Van Daan
Discuss briefly the character sketch of Peter Van Daan.
Read more …Give a brief character sketch of Helen’s father
Give a brief character sketch of Helen’s father.
Read more …How did Helen pass her time when she was not reading
How did Helen pass her time when she was not reading?
Read more …What are Anne’s views about the Laws that restrict the Jews’ freedom
What are Anne’s views about the Laws that restrict the Jews’ freedom?
Read more …In the life of Helen Keller, Ms. Anne Sullivan acts as an inspiration
In the life of Helen Keller, Ms. Anne Sullivan acts as an inspiration behind her extraordinary life. Justify with suitable instances from the text.
Read more …Give a pen portrait of Dr. Alexender Graham Bell
Give a pen portrait of Dr. Alexender Graham Bell.
Read more …A bag contains 15 white and some black balls
A bag contains 15 white and some black balls. If the probability of drawing a black ball from the bag is thrice that of drawing a white ball, find the number of black balls in the bag.
Read more …In the given figure, two concentric circles with centre O have radii 21 cm and 42 cm
In the given figure, two concentric circles with centre O have radii 21 cm and 42 cm. If ∠AOB = 60°, find the area of the shaded region. [Use π = 22/7]
The slant height of a frustum of a cone is 4 cm and the perimeters of its circular ends are 18 cm and 6 cm
The slant height of a frustum of a cone is 4 cm and the perimeters of its circular ends are 18 cm and 6 cm. Find the curved surface area of the frustum.
Read more …The dimensions of a solid iron cuboid are 4.4 m × 2.6 m × 1.0 m. It is melted and recast into a hollow cylindrical pipe
The dimensions of a solid iron cuboid are 4.4 m × 2.6 m × 1.0 m. It is melted and recast into a hollow cylindrical pipe of 30 cm inner radius and thickness 5 cm. Find the length of the pipe.
Read more …Two taps running together can fill a tank in 3 1/13 hours
Two taps running together can fill a tank in 3 1/13 hours. If one tap takes 3 hours more than the other to fill the tank, then how much time will each tap take to fill the tank?
Read more …In an equilateral triangle ABC, D is a point on the side BC
In an equilateral triangle ABC, D is a point on the side BC such that BD = 1/3 BC. Prove that 9AD2 = 7AB2
Read more …The angles of depression of the top and bottom of a building 50 metres high
The angles of depression of the top and bottom of a building 50 metres high as observed from the top of a tower are 30° and 60°, respectively. Find the height of the tower and also the horizontal distance between the building and the tower.
Read more …If the ratio of the sum of the first n terms of two A.Ps is (7n+1) : (4n+27)
If the ratio of the sum of the first n terms of two A.Ps is (7n + 1) : (4n + 27), then find the ratio of their 9th terms.
Read more …An aeroplane is flying at a height of 300 m above the ground
An aeroplane is flying at a height of 300 m above the ground. Flying at this height, the angles of depression from the aeroplane of two points on both banks of a river in opposite directions are 45° and 60° respectively. Find the width of the river. [Use √3 = 1.732]
Read more …If the points A(k + 1, 2k), B(3k, 2k + 3) and C(5k - 1, 5k) are collinear
If the points A(k + 1, 2k), B(3k, 2k + 3) and C(5k - 1, 5k) are collinear, then find the value of k.
Read more …Two different dice are thrown together
Two different dice are thrown together. Find the probability that the numbers obtained have
- even sum
- even product
In the given figure, ABCD is a rectangle of dimensions 21 cm × 14 cm
In the given figure, ABCD is a rectangle of dimensions 21 cm × 14 cm. A semicircle is drawn with BC as diameter. Find the area and the perimeter of the shaded region in the figure.
In a rain-water harvesting system, the rain-water from a roof of 22 m × 20 m drains
In a rain-water harvesting system, the rain-water from a roof of 22 m × 20 m drains into a cylindrical tank having diameter of base 2 m and height 3.5 m. If the tank is full, find the rainfall in cm.
Read more …If the sum of the first 14 terms of an AP is 1050 and its first term is 10
If the sum of the first 14 terms of an AP is 1050 and its first term is 10, find the 20th term.
Read more …How many two-digit numbers are divisible by 3
How many two-digit numbers are divisible by 3?
Read more …Determine the AP whose 3rd term is 5 and the 7th term is 9
Determine the AP whose 3rd term is 5 and the 7th term is 9.
Read more …A rectangular park is to be designed whose breadth is 3 m less than its length
A rectangular park is to be designed whose breadth is 3 m less than its length. Its area is to be 4 square metres more than the area of a park that has already been made in the shape of an isosceles triangle with its base as the breadth of the rectangular park and of altitude 12 m. Find its length and breadth.
Read more …The sum of a two-digit number and the number obtained by reversing the digits is 66
The sum of a two-digit number and the number obtained by reversing the digits is 66. If the digits of the number differ by 2, find the number. How many such numbers are there?
Read more …The ratio of incomes of two persons is 9:7 and the ratio of their expenditures is 4:3
The ratio of incomes of two persons is 9:7 and the ratio of their expenditures is 4:3. If each of them manages to save Rs. 2000 per month, find their monthly incomes.
Read more …Find the zeroes of the quadratic polynomial x^2 + 7x + 10
Find the zeroes of the quadratic polynomial x2 + 7x + 10, and verify the relationship between the zeroes and the coefficients.
Read more …Find the HCF and LCM of 6, 72 and 120
Find the HCF and LCM of 6, 72 and 120, using the prime factorisation method.
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