List of top Questions asked in CBSE Class Twelve Board Exam- 2024

Write the structures of A and B in the following reaction: \[ \text{C}_6\text{H}_5\text{COOH} \xrightarrow{\text{NH}_3, \Delta} A \xrightarrow{\text{Br}_2/\text{NaOH}} B \]
Write the IUPAC name of the following complex: [PtCl\(_2\)(en)\(_2\)](NO\(_3\))\(_2\)
Describe any three sources to know about the Revolt of 1857.
“Then I lost my spirit.” What are the incidents that led Zitkala-Sa to feel this way?
Stephen Spender’s visit to the Gemini Studios was viewed as an unexplained mystery by the Gemini family. How did Asokamitran solve this mystery years later? (Poets and Pancakes)
NUK Ltd. forfeited 1,000 shares of ₹ 10 each, fully called up for non-payment of final call of ₹ 2 per share. 800 of these shares were reissued at ₹ 11 per share fully paid. The amount credited to Capital Reserve Account will be:
Obtain an expression for the electric potential due to a small dipole of dipole moment \( \vec{p} \), at a point \( \vec{r} \) from its centre, for much larger distances compared to the size of the dipole.
Addiction to mobile phones is becoming a cause of concern today. It is impacting both physical and mental health of young and old alike. You attended a workshop on ‘Joy of Missing Out’ organized by Home Association. As the local correspondent, write a report on the event. You may use the following cues along with your own ideas. You are Rita/Rakesh of Savitri Nagar.
Addiction to mobile phones is becoming a cause of concern today
When a certain conductivity cell was filled with 0.05 M KCl solution, it has a resistance of 100 ohms at 25°C. When the same cell was filled with 0.02 M AgNO3 solution, the resistance was 90 ohms. Calculate the conductivity and molar conductivity of $\text{AgNO}_{3}$ solution.
Given: Conductivity of 0.05 M KCl solution = \( 1.35 \times 10^{-2} \, \Omega^{-1} \, \text{cm}^{-1} \)
(b)(ii) Mention any two examples of diversification activities in the non-agro processing industries.
At the same temperature, \( CO_2 \) gas is more soluble in water than \( O_2 \) gas. Which one of them will have a higher value of \( K_H \) and why?
A ray of light is incident normally on a prism ABC of refractive index \( \sqrt{2} \), as shown in the figure. After it strikes face AC, it will
A ray of light is incident normally
Chavi Ltd. purchased machinery from Neo Ltd. It was agreed that the purchase consideration will be paid by issuing 10,000 equity shares of rupee10 each at a premium of 10% and a bank draft of rupee50,000. Pass the necessary Journal entries in the books of Chavi Ltd. for the above transactions.
What do you understand by “interstices”? How does Umberto Eco utilize his interstices? (The Interview)
Two long straight wires 1 and 2 are kept as shown in the figure. The linear charge density of the two wires are \(\lambda\) 1 = 10 C/m and \(\lambda\)2 = -20 C/m. Find the net force F experienced by an electron held at point P:

Printkit Limited invited applications for issue of 80,000 equity shares of  Rs 10 each. The amount was payable as follows:

  • On Application: ₹ 3  per share
  • On Allotment: ₹ 2  per share
  • On First and Final Call: Balance

Applications for 1,50,000 shares were received. Applications for 10,000 shares were rejected, and pro-rata allotment was made to the remaining applicants as follows:

  • Category A: Applicants for 80,000 shares were allotted 40,000 shares.
  • Category B: Applicants for 60,000 shares were allotted 40,000 shares.

Excess money received on application was adjusted toward the amount due on allotment and first and final call. All the amounts due on allotment and first and final call were duly received

The perimeter of a rectangular metallic sheet is 300 cm. It is rolled along one of its sides to form a cylinder. Find the dimensions of the rectangular sheet so that the volume of the cylinder so formed is maximum.
When I sense a flash of it in Mukesh, I am cheered. How is Mukesh’s attitude of life different from that of his family and friends?
Using integration, find the area bounded by the ellipse \( 9x^2 + 25y^2 = 225 \), the lines \( x = -2, x = 2 \), and the X-axis.
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:
‘See you soon Amma.’ How are these words contrary to the speaker’s emotions?
An increase in the number of vehicles on the road has increased instances of traffic snarls, road rage, and accidents. Write a letter to the editor of a national daily showing your concern and examining the reasons for such behaviour. Provide suggestions on how to manage the situation. You are Brinda/Bharat. 
An increase in the number of vehicles on the road has increased instances
Two vertices of the parallelogram \( ABCD \) are given as \( A(-1, 2, 1) \) and \( B(1, -2, 5) \). If the equation of the line passing through \( C \) and \( D \) is: \[ \frac{x - 4}{1} = \frac{y + 7}{-2} = \frac{z - 8}{2}, \] find the distance between sides \( AB \) and \( CD \). Hence, find the area of the parallelogram \( ABCD \).
Draw the circuit diagrams for obtaining the V-I characteristics of a p-n junction diode. Explain briefly the salient features of the V-I characteristics in (i) forward biasing, and (ii) reverse biasing.
What inference can you draw about Sophie’s relationship with her father from the story ‘Going Places’?