List of top Questions asked in CBSE CLASS XII

With reference to flower color, two independent crosses were made, one between true breeding garden pea plants and another between true breeding Antirrhinum plants. Write the phenotypes of their F$_1$ progeny. Justify your answer giving reasons.

Give the meaning of 'Contract Note' and "T+2' system in the trading procedure in a stock exchange.

Discuss any two salient features of the Indian industrial sector during the period of 1950-1990.

Mohit understands the motives, feelings and behaviours of other people and can develop a comfortable relationship with them. He also likes to travel as he recognises the beauty of different species of flora and fauna. Identify the types of intelligence that Mohit possesses in accordance with Gardner's theory. From the information provided about Mohit, explain any two other types of intelligence that Mohit may not be possessing.

On disSolution of a partnership firm, if realisation expenses are paid by the firm on behalf of a partner, then such expenses are debited to which of the following account:

The picture given below shows:

(a) Roots of a typical control tobacco crop plant (infected).
(b) Transgenic tobacco plant showing healthy roots even after deliberate infection by nematode.
Explain how this transformation was achieved in the tobacco plant.

The vapour pressures of A and B at 25°C are 75 mm Hg and 25 mm Hg, respectively. If A and B are mixed such that the mole fraction of A in the mixture is 0.4, then calculate the mole fraction of B in the vapour phase.

A circular coil of radius 10 cm is placed in a magnetic field $ \vec{B} = (1.0 \hat{i} + 0.5 \hat{j}) \, \text{mT} $ such that the outward unit vector normal to the surface of the coil is $ (0.6 \hat{i} + 0.8 \hat{j}) $. The magnetic flux linked with the coil is:

Two long straight thin wires AB and CD have linear charge densities $ 10 \, \text{mC/m} $ and $ -20 \, \text{mC/m} $, respectively. They are kept parallel to each other at a distance of 1 m. Find the magnitude and direction of the net electric field at a point midway between them.

In normal adjustment, for a refracting telescope, the distance between the objective and eyepiece lens is 1.00 m. If the magnifying power of the telescope is 19, find the focal length of the objective and the eyepiece lens.

Why is the Harappan drainage system considered a planned and complete drainage system? Explain.

You are Shri E.A.S. Prasad, a well-known local cricketer. You have been invited as a chief guest for an inter-school cricket championship in K.P.S School, Mahabagh. Create an appropriate formal letter of acceptance.

A, B and C were partners in a firm sharing profits and losses in the ratio of $ \frac{1}{2} : \frac{1}{3} : \frac{1}{4} $. D was admitted in the firm for $ \frac{1}{6} $ share. C would retain his original share. The new profit sharing ratio will be:

Given that $ A^{-1} = \frac{1}{7} \begin{bmatrix} 2 & 1 \\ -3 & 2 \end{bmatrix} $, matrix $ A $ is:

If $$ \int_{0}^{a} \frac{1}{4 + x^2} \, dx = \frac{\pi}{6}, $$ then the value of $ a $ is:

Mohan, Suhaan, and Adit were partners in a firm sharing profits and losses in the ratio $3 : 2 : 1$. Their fixed capitals were \rupee2,00,000, \rupee1,00,000, and \rupee1,00,000 respectively. For the year ended 31st March 2023, interest on capital was credited to their accounts @8\% p.a. instead of 5\% p.a. Pass necessary adjusting journal entry.

What was the ‘thunderclap’ the narrator received as M. Hamel began the lesson?

If $ A $ and $ B $ are two non-zero square matrices of the same order such that: $$ (A + B)^2 = A^2 + B^2, $$ then:

Which of the following compounds will give a ketone on oxidation with chromic anhydride (CrO3})?

Draw a schematic diagram of an antibody molecule and label any 4 parts. Mention their chemical nature. Name the cells which produce them.

Study the figures given below that depict the comparative age distribution of human populations in Sweden and Rwanda (International Data Base 2003) and answer the questions that follow:
\begin{figure[H] \centering \includegraphics[width=0.8\textwidth]{Screenshot 2025-01-17 115648.png} \caption{Population pyramids of Sweden and Rwanda showing age and gender distribution.} \label{fig:population_pyramids} \end{figure} (a) What can be inferred from the very broad base of Rwanda’s age pyramid? Support your answer with the data provided in the figure.}

A population of snakes lived in a desert with brown sand. Study the drawings given below showing the change in the population from ‘one’ to ‘two’ over time and answer the question that follows. Brown snakes and Grey snakes are represented by alleles A/a (Dominant/recessive).

(a) If the frequency of the recessive trait is 9% in population-one, work out the frequency of homozygous dominant and heterozygous dominant snakes.

On the basis of the given information, calculate the values of the following:

Read the following text carefully from ‘The Economic Times’ dated 8th June, 2023:
{“The Reserve Bank of India’s (RBI’s) rate-setting panel unanimously decided to keep the benchmark lending rate unchanged at 6.5%. The committee voted to remain focused on the withdrawal of accommodative monetary policy.”}
On the basis of the given text and common understanding, answer the following questions: (a) Identify and discuss the economic issue indicated in the above text.

For a hypothetical economy, assume the government increased infrastructural investment by ₹10,000 crore. 80% of additional income is consumed in the economy. Estimate the increase in income and the corresponding increase in consumption expenditure in the economy.