HSC Science (Computer Science) 12th Standard Board Exam - Maharashtra State Board Important Questions

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

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

State Henry’s law.

Define limiting molar conductivity.

Give reasons for the following:

The transition metals generally form coloured compounds.

Explain the term Antiseptics

Macro economics is different from micro economics.

Explain the types of price elasticity of demand.

Name and explain the types of monopoly.

Explain any four features of national income.

Look at the following web chart and write a short paragraph based on it in about 120 words. Suggest a suitable title:

(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. 

State and prove: Law of conservation of angular momentum.

Derive the relation between surface tension and surface energy per unit area.

On what factors does the potential gradient of the wire depend?

Define Magnetization.

Define mutual inductance.

On what factors does the potential gradient of the wire depend?

Define Magnetization.

Define mutual inductance.