List of top Questions asked in CBSE Class X

What are the differences between the transport of materials in xylem and phloem?
In Fig. 10.13, XY and X'Y' are two parallel tangents to a circle with centre O and another tangent AB with point of contact C intersecting XY at A and X'Y' at B. Prove that ∠AOB = 90°.
XY and X'Y' are two parallel tangents to a circle with centre O
Fig. 10.13
How did Mandela’s ‘hunger for freedom’ change his life?
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be –
Differentiate between metal and non-metal on the basis of their chemical properties.

Consider the following distribution of daily wages of 50 workers of a factory

Daily wages (in Rs)500 - 520520 -540540 - 560560 - 580580 -600
Number of workers12148610

Find the mean daily wages of the workers of the factory by using an appropriate method.

Draw the graphs of the equations \(x – y + 1 = 0 \)and \(3x + 2y – 12 = 0\). Determine the coordinates of the vertices of the triangle formed by these lines and the \(X\)-axis, and shade the triangular region.

The following table gives the distribution of the life time of 400 neon lamps :

Life time (in hours)Number of lamps

1500 - 2000

14

2000 - 2500

56

2500 - 3000

60

3000 - 3500

86

3500 - 4000

74

4000 - 4500

62

4500 - 5000

48

Find the median life time of a lamp.

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

Butanone is a four-carbon compound with the functional group

At the time of short circuit, the current in the circuit
Which of the following correctly describes the magnetic field near a long straight wire?
Draw a labelled diagram of the longitudinal section of a flower.

Describe double circulation of blood in human beings.Why is it necessary?

Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.
A spherical mirror and a thin spherical lens have each a focal length of −15 cm. The mirror and the lens are likely to be
Why does the conductor refer to Valli as ‘madam’?
How does Ausable manage to make Max believe that there is a balcony attached to his room? Look back at his detailed description of it. What makes it a convincing story?
Compare the power used in the 2 Ω resistor in each of the following circuits:
  1. a 6 V battery in series with 1 Ω and 2 Ω resistors,
  2. a 4 V battery in parallel with 12 Ω and 2 Ω resistors.
Do you think Horace Danby was unfairly punished, or that he deserved what he got?
Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?
An object 5.0 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position of the image, its nature and size.

Sides AB and BC and median AD of a triangle ABC are respectively proportional to sides PQ and QR and median PM of ∆PQR (see the given figure). Show that ∆ABC ∼ ∆PQR.

Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field?
The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below -
I (amperes) 0.51.02.03.04.0
V (volts)1.63.4  6.710.213.2
Plot a graph between V and I and calculate the resistance of that resistor.