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Important Questions for HSC Science (General) 12th Board Exam - Maharashtra State Board

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Define terms: Fuel cell

Appears in 13 question papers
Chapter: [4] Electrochemistry
Concept: Batteries > Primary Batteries

Write the chemical equations involved in the following reactions:(i) Hoffmann-bromamide degradation reaction

Appears in 12 question papers
Chapter: [13.01] Amines
Concept: Amines > Preparation of Amines

Features of Monopolistic Competition.

Appears in 8 question papers
Chapter: [1.05] Types of Market and Price Determination Under Perfect Competition
Concept: Main Market Forms

State Ampere’s circuital law

Appears in 8 question papers
Chapter: [14] Magnetic Effects of Electric Current
Concept: Ampere’s Circuital Law

Give the applications of DNA fingerprinting technique.

Appears in 7 question papers
Chapter: [8.01] Genetic Engineering and Genomics
Concept: DNA Fingerprinting

Explain the law of demand with its assumptions.

Appears in 7 question papers
Chapter: [1.03] Analysis of Demand and Elasticity of Demand
Concept: Demand Curve and Its Slope

The following data were obtained during the first order thermal decomposition of SO2Cl2 at a constant volume :

SO2Cl2 (g) → SO2 (g) + Cl2 (g)

Experiment Time/s–1 Total pressure/atm
1 0 0.4
2 100 0.7

Calculate the rate constant.

(Given : log 4 = 0.6021, log 2 = 0.3010)

Appears in 6 question papers
Chapter: [5] Chemical Kinetics
Concept: Factors Influencing Rate of a Reaction

Account for the following : Nitrogen does not form pentahalide.

Appears in 6 question papers
Chapter: [7.01] Group 15 Elements
Concept: P - Block Group 15 Elements > Dinitrogen

Distinguish between the following.

Micro Economics and Macro Economics.

Appears in 6 question papers
Chapter: [2.01] Introduction to Macro Economics
Concept: Difference Between Mirco Economic and Macro Economic

Derive the mathematical expression for law of radioactive decay for a sample of a radioactive nucleus

Appears in 6 question papers
Chapter: [18] Atoms, Molecules and Nuclei
Concept: Radioactivity > Law of Radioactive Decay

Work out a typical Mendelian dihybrid cross and state the law that he derived from it.

Appears in 5 question papers
Chapter: [1.01] Genetic Basis of Inheritance
Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy

Describe the structure of a nucleosome.

Appears in 5 question papers
Chapter: [1.02] Gene - Its Nature, Expression and Regulation
Concept: The DNA > Packaging of Dna Helix

Explain the carbon cycle with the help of a simplified model.

Appears in 5 question papers
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
Concept: Nutrient Cycling

State Henry’s law.

Appears in 5 question papers
Chapter: [2] Solutions and Colligative Properties
Concept: Solubility > Solubility of a Gas in a Liquid

Explain the term Antiseptics

Appears in 5 question papers
Chapter: [16.01] Chemicals in Medicines
Concept: Drugs and Their Classification

(A) Read the following extract and answer the questions given below:
   Chronic floods during the monsoon, on average, affect more than 30 million Indians annually Ironically, 60% of India's farmland, 66% of its livestock and its entire forest area depend on rains for survival.
   According to a recently released Central Water Commission (CWC) report, on an average, 7·21 million hectares (roughly 72,000 sq. km.) go under floodwater. This water typically ravages 3·78 million hectares of agricultural land, damaging crops worth Rs. 1, 118 crores annually.
   Heavy rains and floods account for nearly 1,700 lives lost annually. Apart from this, I ·25 lakh houses are annually damaged by torrential rains that also wipe out nearly 96,000 livestock.
   Floods are the most recurrent natural calamity, hitting India almost every year. According to the CWC's report on financial aspects of flood control, anti-sea erosion and drainage projects, it is not possible to provide absolute protection instantly to all flood-prone areas. It says that such an attempt will neither be practical nor economically viable.
   The CWC's analysis of floods in India from 1953 to 2011 shows a marginal decline in flood-affected areas over the years, the data shows 1977 1978 and 1979 were the worst-hit. The 1977 floods killed over 11,000 people, six-time the average for the 59 years, between 1953 and 2011. In terms of area and population affected, the floods of 1978 were the most destructive.
  In terms off the financial loss, recent floods have been far more destructive. The total loss of crops, houses and public utilities in 2009 was Rs. 32541 crores, the highest for any year.

Question
(1) What is the above extract about?

(2) How do floods adversely affect India?

(3) Why is it not possible to provide absolute protection to all flood-prone areas?

(4) How would you help the flood-affected people?

(5) Rewrite the following sentences in the ways instructed :
(i) The floods of 1978 were the most destructive.
(Change the sentence into the 'positive degree'.)
(ii) Floods are the most recurrent natural calamity hitting India almost every year.
(Make it a complex sentence.)
(iii) Floods have been far more destructive.
(Rewrite the sentence using the Simple Present tense.)

(6) Give the meanings of:
(i) entire
(ii) calamity

(B) Write a brief summary of the above extract with the help of the points given below and suggest a suitable title.
Floods - natural, recurrent calamity in India - destroy life and property - no absolute protection - neither practical nor economically viable- floods in 1977 and 1978. 

Appears in 5 question papers
Chapter: [3.02] Reading Skill
Concept: Reading Skill

Describe, with the help of a circuit diagram, the working of Zener diode as a voltage regulator.

Appears in 5 question papers
Chapter: [19] Semiconductors
Concept: Zener Diode as a Voltage Regulator

What is ecological succession?

Appears in 4 question papers
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
Concept: Ecological Succession

Explain sex determination in human beings.

Appears in 4 question papers
Chapter: [7.02] Chromosomal Basis of Inheritance
Concept: Sex Determination > Sex Determination in Humans

Construct an age pyramid which reflects an expanding growth status of human population.

Appears in 4 question papers
Chapter: [12.01] Organisms and Environment 2
Concept: Population > Population Attributes
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