List of top Questions asked in CBSE Class XI

There is mention of three communities in the story: the Marathas, the Mughals, the Anglo-Indians. Which language do you think they used within their communities and while speaking to the other groups?

Take one flower of the family Solanaceae and write its semi-technical description. Also draw their floral diagram.

Find the derivative of x²– 2 at x = 10

Figures 9.20(a) and (b) refer to the steady flow of a (non-viscous) liquid. Which of the two figures is incorrect ? Why ?

flow of a (non-viscous) liquid

Figure 8.9 shows the strain-stress curve for a given material. What are (a) Young’s modulus and (b) approximate yield strength for this material?

strain-stress curve for a given material

How, according to you, can peace and liberty be maintained in a state?

A particle starts from the origin at t = 0 s with a velocity of 10.0 j m/s and moves in the x-y plane with a constant acceleration of (8.0 i + 2.0j ) m s-2.

(a) At what time is the x- coordinate of the particle 16 m? What is the y-coordinate of the particle at that time?

(b) What is the speed of the particle at the time ?

What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions.

F^-
Ar
Mg²⁺
Rb⁺

Did the boys return the horse because they were conscience-stricken or because they were afraid?

‘Have you come back?’ said the woman. ‘I thought that no one had come back.’ Does this statement give some clue about the story? If yes, what is it?

Find \((a + b)^4 - (a - b)^4\). Hence, evaluate \((\sqrt3 + \sqrt2)^4 - (\sqrt3 - \sqrt2)^4\).

Fig. 13.18 depicts four x-t plots for linear motion of a particle. Which of the plots represent periodic motion? What is the period of motion (in case of periodic motion)

How many litres of water will have to be added to 1125 litres of the 45% solution of acid so that the resulting mixture will contain more than 25% but less than 30% acid content?

Does the number of moles of reaction products increase, decrease or remain same when each of the following equilibria is subjected to a decrease in pressure by increasing the volume?

\(PCl_5 (g) ⇋ PCl_3 (g) + Cl_2 (g)\)
\(CaO (s) + CO_2 (g) ⇋ CaCO_3 (s)\)
\(3Fe (s) + 4H_2O (g) ⇋ Fe_3O_4 (s) + 4H_2 (g)\)

The oxygen molecule has a mass of 5.30 × 10^-26 kg and a moment of inertia of 1.94 ×10^-46 kg m² about an axis through its centre perpendicular to the lines joining the two atoms. Suppose the mean speed of such a molecule in a gas is 500 m/s and that its kinetic energy of rotation is two thirds of its kinetic energy of translation. Find the average angular velocity of the molecule.

Describe the change in hybridisation (if any) of the Al atom in the following reaction.
\(AlCl_3+Cl^- \rightarrow AlCl_4^-\)

Briefly explain the following statements from the text.
1.“You neither travelled to the past nor the future. You were in the present experiencing a different world.”
2. “You have passed through a fantastic experience: or more correctly, a catastrophic experience.”
3. Gangadharpant could not help comparing the country he knew with what he was witnessing around him.
4. “The lack of determinism in quantum theory!”
5. “You need some interaction to cause a transition.”

The Sun is a hot plasma (ionized matter) with its inner core at a temperature exceeding \(10^7\) K, and its outer surface at a temperature of about 6000 K. At these high temperatures, no substance remains in a solid or liquid phase. In what range do you expect the mass density of the Sun to be, in the range of densities of solids and liquids or gases ? Check if your guess is correct from the following data : mass of the Sun = \(2.0\) ×\(10^{30}\) kg, radius of the Sun = \(7.0\)× \(10^8\)m.

The first ionization constant of H₂S is 9.1 × 10^–8. Calculate the concentration of HS^– ion in its 0.1M solution. How will this concentration be affected if the solution is 0.1M in HCl also? If the second dissociation constant of H₂S is 1.2 × 10^–13, calculate the concentration of S₂^– under both conditions.

Traditions, rituals and funerary practices must be respected.

Briefly comment on "The purpose of the author’s journey to Mount Kailash."

In the triangle ABC with vertices A (2, 3), B (4, –1) and C (1, 2), find the equation and length of altitude from the vertex A.

In a test experiment on a model aeroplane in a wind tunnel, the flow speeds on the upper and lower surfaces of the wing are 70 m s^–1and 63 m s^-1 respectively. What is the lift on the wing if its area is 2.5 m² ? Take the density of air to be 1.3 kg m^–3.

Three reasons why the author’s grandmother was disturbed when he started going to the city school.

Mention the three phases of the author’s relationship with his grandmother before he left the country to study abroad.

List of top Questions asked in CBSE Class XI

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