List of top Questions asked in CBSE CLASS XII

Ajay Ltd. forfeited 100 shares of Rs 10 each for non-payment of first call of Rs 1 per share and second and final call of Rs 3 per share. The minimum price per share at which these shares can be reissued will be:

Assertion : In Bohr model of hydrogen atom, the angular momentum of an electron in \( n \)th orbit is proportional to the square root of its orbit radius \( r_n \)

Reason (R): According to Bohr model, electron can jump to its nearest orbits only.

Assertion (A): The deflection in a galvanometer is directly proportional to the current passing through it. 

Reason (R): The coil of a galvanometer is suspended in a uniform radial magnetic field.

Four point charges \( Q \) each, are held at the four corners of a square of side \( l \). The amount of work done in bringing a charge \( Q \) from infinity to the centre of the square will be:
The focal length of a concave mirror in air is \( f \). When the mirror is immersed in a liquid of refractive index \( \frac{3}{5} \), its focal length will become:
A coil of an AC generator, having 100 turns and area 0.1 m² each, rotates at half a rotation per second in a magnetic field of 0.02 T. The maximum emf generated in the coil is:
Choose the correct option to fill the blank:
By 2050, the world population is estimated to live in urban areas is ______.
Arrange the following oil refineries of India from south to north direction as per their locations and choose the correct option:
(i) Mumbai
(ii) Kochi
(iii) Kayali
(iv) Mangaluru
Choose the correctly matched pair of areas and their characteristics from the following:
Identify the district of first phase of construction of Rajasthan canal.
Arrange the following airports of Asia from west to east as per their locations and choose the correct option:
(i) Beijing
(ii) Tokyo
(iii) Aden
(iv) Mumbai
Which of the following statements are correct related to mining? Choose the correct option:
(i) In ancient times minerals were used to make tools and weapons.
(ii) All developed countries are extracting more minerals for their development.
(iii) The actual development of mining began with the industrial revolution.
(iv) There are many stages in the discovery of minerals.
Identify the main objective of Gas Authority of India Limited (GAIL) from the following:
Read the following facts about ‘Swachh Bharat Mission’ carefully and choose the correct option:
(i) It is a part of urban renewable mission.
(ii) It is launched by Government of India.
(iii) It is associated with improving greenery in urban areas.
(iv) It is aimed to improve quality of life in urban slums.
“Some wastelands are rendered unfit for agriculture by human activities.” Choose the correct option related to the statement:
(i) Shifting cultivation area
(ii) Coastal plains
(iii) Degraded pastures
(iv) Bhabar areas
The exported items by a port is first brought from different countries. This port is known as ______.
Two statements are given below. They are Assertion (A) and Reason (R). Read both the statements carefully and choose the correct option:
Assertion (A): Water transport plays an important role in the international trade of India.
Reason (R): The east coast of India has more ports than its west coast.
Identify the main characteristics of quaternary activity from the following:
Identify the unit to measure sound from the following:
Two statements are given below. They are Assertion (A) and Reason (R). Read both the statements carefully and choose the correct option:
Assertion (A): All manufacturing industries are associated with raw materials.
Reason (R): Resources are essential for human survival.
Daman, Mohit and Paras were partners in a firm sharing profits and losses in the ratio of 4 : 3 : 2. Daman retires. Mohit and Paras decided to share future profits and losses in the ratio of 5 : 3. The gaining ratio of Mohit and Paras will be:
Which chart element provides additional information about a data marker to identify the details of data in data series?
The outcome of an arithmetic expression or function is called:
The statement that shows changes in all items of financial statements in absolute and percentage terms over a period of time, for a firm, or between two firms is called ______.
_______ ratios indicate the speed at which activities of the business are being performed.