List of top Questions asked in CBSE Class X

Why does menstruation occur?
What are the functions performed by the testes in human beings?
The change in focal length of an eye lens is caused by the action of the
What are the advantages of sexual reproduction over asexual reproduction?
The anther contains
The least distance of distinct vision for a young adult with normal vision is about
Which of the following is not a part of the female reproductive system in human beings?
The human eye forms the image of an object at its
Asexual reproduction takes place through budding in

What would be the consequences of a deficiency of haemoglobin in our bodies?

How are the alveoli designed to maximise the exchange of gases?

What is the role of the acid in our stomach?

The breakdown of pyruvate to give carbon dioxide, water and energy takes place in

The autotrophic mode of nutrition requires

The xylem in plants are responsible for

The kidneys in human beings are a part of the system for

How many 176 Ω resistors (in parallel) are required to carry 5 A on a 220 V line?
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to
A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?
What is the far point and near point of the human eye with normal vision?
How is a voltmeter connected in the circuit to measure the potential difference between two points?

Explain the mechanism of the cleaning action of soaps.

Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be –

Give a test that can be used to differentiate between saturated and unsaturated hydrocarbons