CBSE Physics, Chemistry & Maths Important Questions For Class 12th: Students who are pushing intermediate form CBSE Board, they knew that board exam will be started from the first week of march 2016, they are doing preparation for their board exam. Some students are searching for the important question for CBSE Physics, Chemistry & Maths for the class 12th to prepare their Board Exam.
In this article, the students of CBSE Board of class 12th can get the CBSE Physics, Chemistry & Maths Important Question.
CBSE Physics, Chemistry & Maths:
Every student knows that the board exam is near, and started for the first week of the March, every year the Board exam is organized by the Education Board from every years month of March. Students of CBSE who are searching for the CBSE Physics, Chemistry & Maths for class 12th they can get it from this article.
In this article, you can get, important ten question of Physics and Chemistry which is given below.
Click here to check CBSE 12th Class Blueprint All Subject
CBSE Physics Ten Question:
Q1. Define capacitor reactance. Write its S.I. units?
Q2. How are side bands produced?
Q3. Draw the logic symbol for NAND gate and give its Truth Table?
Q4. Distinguish between amplitude modulation and frequency modulation.
Q5. What is the electric flux through a cube of side 1 cm which encloses an electric dipole?
Q6. Show that the radius of the orbit in hydrogen atom varies as n(square), where n is the principal quantum number of the atom.
Q7. Distinguish between ‘intrinsic’ and ‘extrinsic’ semiconductors.
Q8. A proton and a α-particle have the same de-Broglie wavelength. Determine the ratio of
(i) their accelerating potentials
(ii) their speeds.
Q9. Find an expression for the intensity of transmitted light when a polaroid sheet is rotated between two crossed polaroids. In which position of the polaroid sheet will the transmitted intensity be maximum?
Q10. A group of students while coming from the school noticed a box marked “Danger H.T. 2200 V” at a substation in the main street. They did not understand the utility of a such a high voltage while they argued, the supply was only 220 V. They asked their teacher this question the next day. The teacher thought it to be an important question and,
therefore, explained to the whole class.
Answer the following questions:
(i) What device is used to bring the high voltage down to the low voltage of a.c. current
and what is the principle of its working?
(ii) Is it possible to use this device for bringing down the high dc voltage to the low
(iii) Write the values displayed by the students and the teacher.
CBSE Chemistry Ten Question:
Q1. Out of BaCl2 and KCl, which one is more effective in causing coagulation of a negatively charged colloidal Sol ? Give reason.
Q2. What is the formula of a compound in which the element Y forms ccp lattice and atoms of X occupy 1/3rd of tetrahedral voids?
Q3. Define azeotropes. What type of azeotrope is formed by positive deviation from Raoult’s law? Give an example.
Q4.What are the transition elements? Write two characteristics of the transition elements.
Q5. Give reasons for the following observations:
a. Leather gets hardened after tanning.
b. Lyophilic sol is more stable than the lyophobic sol.
c. It is necessary to remove CO when ammonia is prepared by Haber’s process.
Q6.Write the names and structures of the monomers of the following polymers:
a. Nylon-6, 6
Q7. How do you convert the following:
a. Phenol to anisole
b. Propan-2-ol to 2-methylpropan-2-ol
c. Aniline to phenol
Q8. a. Which one of the following is a disaccharide: Starch, Maltose, Fructose, Glucose?
b. What is the difference between fibrous protein and globular protein?
c. Write the name of vitamin whose deficiency causes bone deformities in children.
Q9. 3.9 g of benzoic acid dissolved in 49 g of benzene shows a depression in freezing point of 1.62 K. Calculate the van Hoff factor and predict the nature of solute (associated or dissociated).
(Given: Molar mass of benzoic acid = 122 g mol–1, Kf for benzene = 4.9 K kg mol–1)
Q10.Answer the Following question:
a. Indicate the principle behind the method used for the refining of zinc.
b. What is the role of silica in the extraction of copper?
c. Which form of the iron is the purest form of commercial iron?
CBSE Maths Ten Question:
CBSE Maths Sample Paper click here
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