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Science (English Medium) Class 12 - CBSE Important Questions

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Draw the zwitter ion structure for sulphanilic acid.

Appears in 5 question papers
Chapter: [10] Biomolecules
Concept: Classification of Amino Acids

Explain the term Antiseptics

Appears in 5 question papers
Chapter: [16] Chemistry in Everyday Life
Concept: Classification of Drugs

अच्छे फीचर की किन्हीं तीन विशेषताओं का उल्लेख कीजिए।

Appears in 5 question papers
Chapter: [3.2] पत्रकारीय लेखन के विभिन्न रूप और लेखन प्रक्रिया
Concept: पत्रकारीय लेखन के विभिन्न रूप और लेखन प्रक्रिया

 If A is a square matrix such that A2 = I, then find the simplified value of (A – I)3 + (A + I)3 – 7A.

Appears in 5 question papers
Chapter: [3] Matrices
Concept: Types of Matrices

if the matrix A =`[(0,a,-3),(2,0,-1),(b,1,0)]` is skew symmetric, Find the value of 'a' and 'b'

Appears in 5 question papers
Chapter: [3] Matrices
Concept: Types of Matrices

If A = `[(2,-3,5),(3,2,-4),(1,1,-2)]` find A−1. Using A−1 solve the system of equations:

2x – 3y + 5z = 11

3x + 2y – 4z = –5

x + y – 2z = –3

Appears in 5 question papers
Chapter: [4] Determinants
Concept: Applications of Determinants and Matrices

Find the area of the region in the first quadrant enclosed by the x-axis, the line y = x and the circle x2 + y2 = 32.

Appears in 5 question papers
Chapter: [8] Applications of the Integrals
Concept: Area Under Simple Curves

A black and a red dice are rolled. 

Find the conditional probability of obtaining the sum 8, given that the red die resulted in a number less than 4.

Appears in 5 question papers
Chapter: [13] Probability
Concept: Conditional Probability

Define Flexibility.

Appears in 5 question papers
Chapter: [10] Training in Sports
Concept: Flexibility and Its Importance

Write two important characteristics of equipotential surfaces.

Appears in 5 question papers
Chapter: [2] Electrostatic Potential and Capacitance
Concept: Equipotential Surfaces

Define the coefficient of self-induction.

Appears in 5 question papers
Chapter: [6] Electromagnetic Induction
Concept: Inductance >> Self Inductance

A series LCR circuit is connected across an a.c. source of variable angular frequency 'ω'. Plot a graph showing variation of current 'i' as a function of 'ω' for two resistances R1 and R2 (R1 > R2).

Answer the following questions using this graph :

(a) In which case is the resonance sharper and why?

(b) In which case in the power dissipation more and why?

Appears in 5 question papers
Chapter: [7] Alternating Current
Concept: AC Voltage Applied to a Series LCR Circuit

State two points of difference between the interference patterns obtained in Young’s double slit experiment and the diffraction pattern due to a single slit.

Appears in 5 question papers
Chapter: [10] Wave Optics
Concept: Diffraction of Light >> The Single Slit

Answer the following question.

Show that the density of the nucleus is independent of its mass number A.

Appears in 5 question papers
Chapter: [13] Nuclei
Concept: Size of the Nucleus

Write the two processes that take place in the formation of a p-n junction.

Appears in 5 question papers
Chapter: [14] Semiconductor Electronics - Materials, Devices and Simple Circuits
Concept: Diode or p-n Junction

Write the property of a junction diode which makes it suitable for rectification of ac voltages.

Appears in 5 question papers
Chapter: [14] Semiconductor Electronics - Materials, Devices and Simple Circuits
Concept: Semiconductor Diode

What is the function of a 'Repeater' used in communication system?

Appears in 5 question papers
Chapter: [15] Communication Systems
Concept: Basic Terminology Used in Electronic Communication Systems

In the midst of severe competition and many conflicts in 1989, a consensus appeared to have emerged among most parties. Explain any three points of consensus.

Appears in 5 question papers
Chapter: [2.1] Challenges of Nation-building
Concept: Political Conflicts Overlanguage

Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.

Appears in 4 question papers
Chapter: [1] Sexual Reproduction in Flowering Plants
Concept: Pollination

Describe the structure of a seminiferous tubule.

Appears in 4 question papers
Chapter: [2] Human Reproduction
Concept: The Male Reproductive System
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