NARAYANKAR NOTES

1. The Cell Wall (The Outer Layer) The cell wall is a rigid, protective layer found outside the plasma membrane in plants, fungi, and some protists. Composition: Algae: Contains cellulose, galactans, mannans, and calcium carbonate. Land Plants: Primarily hemicelluloses, pectin, lipids, and proteins. Strength: Cellulose microfibrils provide the primary structural rigidity. Special Depositions: Depending on the plant's needs, the wall may contain: Silica: Provides grit and strength (e.g., grass stems). Cutin & Wax: Prevents water loss (epidermal cells). Suberin: Acts as a waterproof seal (root endodermal cells). Lignin: Provides wood-like structural support. Function: It determines cell shape and acts as a shield against mechanical injury and infection. 

  Physics Test (50 Marks) Chapter:  Dual Nature of Radiation and Matter Time:  2 Hour Section A:  Q.1) Multiple Choice Questions  (10 marks) A photocell used in street lights works with: a) Infrared    b) Visible    c) UV    d) X-rays Cathode material suitable for photoelectric effect: a) Zinc    b) Aluminium    c) Nickel    d) Potassium Stopping potential depends on: a) Average wavelength b) Longest wavelength c) Shortest wavelength d) Intensity Longest de Broglie wavelength (same KE): a) Electron    b) Proton    c) Alpha    d) Hydrogen atom For equal power sources: a) Red < Blue photons b) Red = Blue c) Red > Blue d) None Equation E = pc is valid for: a) Electron    b) Photon    c) Both    d) None Increasing intensity increases: a) KE b) Stopping potential c) Number of electrons d) Work function Threshold frequenc...

  SECTION I : LANGUAGE STUDY (Q.1) Question: If he selects a three-to-one scale, the tip of the robot’s arm will move just one inch. (State whether the sentence is Simple, Compound or Complex.) Answer: Complex Sentence Question: Johnsy was preparing herself for her last journey. (Replace the underlined phrase with a clause.) Answer: Johnsy was preparing herself for the journey that would be her last. Question: Though Sue looked after her well, Johnsy showed no signs of improvement. (Rewrite as affirmative sentence.) Answer: Though Sue looked after her well, Johnsy failed to show signs of improvement. Question: One morning, Ramanujan’s mother made a startling announcement. (Change the voice.) Answer: One morning, a startling announcement was made by Ramanujan’s mother. Question: Tenali Raman is the greatest of all scholars. (Rewrite beginning with “No other…”) Answer: No other scholar is as...

  Test: Inheritance and Variation Time: 2 Hours Maximum Marks: 50 Section A – Multiple Choice Questions( 7 Marks) 1. Phenotypic ratio in incomplete dominance is: a) 3:1   b) 1:2:1   c) 2:1:1   d) 9:3:3:1 2. A cross with recessive parent is called: a) Back cross   b) Test cross   c) Dihybrid cross   d) Monohybrid cross 3. Chromosomal theory was proposed by: a) Mendel   b) Darwin   c) Sutton & Boveri   d) Watson & Crick 4. Turner’s syndrome has: a) XXY   b) XO   c) XXX   d) XY 5. Law of dominance explains: a) Mutation   b) Dominant expression   c) Crossing over   d) Linkage 6. Find the mis match pair :-  a). Down’s syndrome = 44 + XY     b).Turner’s syndrome = 44 + XO  c).Klinefelter syndrome = 44 + XXY   d). Normal female = 44 + XXX 7.Chromosomal theory of inheritance was proposed by ................  a).Sutton and Boveri.    ...

MHT-CET MCQ Practice - Oscillation Oscillation MCQ Practice Physics | MHT-CET Previous year questions with detailed solutions MHT-CET Q1. Two springs of constants k₁ and k₂ have equal maximum velocities, when executing simple harmonic motion. The ratio of their amplitudes (masses are equal) will be: (A) \(\frac{k_1}{k_2}\) (B) \(\frac{k_2}{k_1}\) (C) \(\left(\frac{k_1}{k_2}\right)^{1/2}\) (D) \(\left(\frac{k_2}{k_1}\right)^{1/2}\) Correct Answer (D) \(\left(\frac{k_2}{k_1}\right)^{1/2}\) Solution: The maximum velocity (\(v_{max}\)) in SHM is given by: \[v_{max} = A\omega\] Where \(\omega = \sqrt{\frac{k}{m}}\). Since the masses (\(m\)) and maximum velocities are equal for both springs: ...