List of top Questions asked in CBSE Class X

Write the role of (a) motor and (b) relay neuron.
The students in a class took a thick sheet of cardboard and made a small hole in its centre. Sunlight was allowed to fall on this small hole and they obtained a narrow beam of white light. A glass prism was taken and this white light was allowed to fall on one of its faces. The prism was turned slowly until the light that comes out of the opposite face of the prism appeared on the nearby screen. They studied this beautiful band of light and concluded that it is a spectrum of white light
(i) Give any one more instance in which this type of spectrum is observed.
What happens to white light in the above case?
List two conditions necessary to observe a rainbow.
State Fleming's left-hand rule.
When will the magnitude of the force be highest?
Give reason why carbon can neither form \( C^{4+} \) cations nor \( C^{4-} \) anions but forms covalent compounds.
If we want to obtain a real and magnified image of an object by using a concave mirror of focal length 18 cm. Where should the object be placed? Use mirror formula to determine the object distance for an image of magnification -2 by this mirror to justify your answer.
In human alimentary canal the small intestine is designed to absorb the digested food. Justify this statement.
An electric bulb is rated 220V, 11W. The resistance of its filament when it glows with a power supply of 220V is:
A piece of wire of resistance 'R' is cut lengthwise into three identical parts. These parts are then connected in parallel. If the equivalent resistance of this combination is \( R' \), then the value of \( R/R' \) is:
An optical device ‘X’ is placed obliquely in the path of a narrow parallel beam of light. If the emergent beam gets displaced laterally, the device ‘X’ is:
Select from the following a hydrocarbon having one C-C bond and one C=C bond:
The essential element taken up from the soil by the plants to synthesize proteins is:
Which one of the following has half the number of chromosomes and half the amount of DNA as compared to the non-reproductive body cells?
Which one of the following gets biomagnified at different levels in a food chain?
In the food chains given below, select the most efficient food chain in terms of energy:
The property by virtue of which a solid material can be drawn into thin wires is called:
Plants like rose and banana have lost the capacity to produce:
In order to prepare dry hydrogen chloride gas in a humid atmosphere, the gas produced is passed through a guard tube (drying tube) which contains:
To get an image of magnification -1 on a screen using a lens of focal length 20 cm, the object distance must be:
You can feel other’s pain only when you go through it yourself. Validate this statement with reference to the story, ‘The Letter’ and why it took place?
(The Letter)
“Federal form of government is in direct contrast to the Unitary form of government.” Explain the statement.
What mood of the poet is reflected in the poem Dust of Snow' initially? What images are used by the poet to bring about the effect? Comment.
Explain the irony in the chapter, “A Letter to God”.