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What is atmospheric refraction? Use this phenomenon to explain the following natural events:
Twinkling of stars
Draw diagrams to illustrate your answers.
Concept: Atmospheric Refraction
Write Joule's law of heating.
Concept: Heating Effect of Electric Current
Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity
Concept: Types of Chemical Reactions > Decomposition Reaction
2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube. When the contents are warmed, a gas evolves which is bubbled through a soap solution before testing. Write the equation of the chemical reaction involved and the test to detect the gas. Name the gas which will be evolved when the same metal reacts with dilute solution of a strong acid.
Concept: Chemical Equations
What is observed when a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube? Write equation for the chemical reaction involved and name the type of reaction in this case.
Concept: Types of Chemical Reactions > Double Displacement Reaction
The pH of a salt used to make tasty and crispy pakoras is 14. Identify the salt and write a chemical equation for its formation. List its two uses.
Concept: Salts
A student is unable to see clearly the words written on the black board placed at a distance of approximately 3 m from him. Name the defect of vision the boy is suffering from. State the possible causes of this defect and explain the method of correcting it.
Concept: Defects of Vision and Their Corrections > Myopia
Show how would you join three resistors, each of resistance 9 Ω so that the equivalent resistance of the combination is
1) 13.5
2) 6 Ω
Concept: Resistance of a System of Resistors >> Resistors in Parallel
Why are metals good conductors of electricity whereas glass is a bad conductor of electricity? Give reason?
Concept: Electric Current
Why are efficient means of transport pre-requisites for the fast development of the country? Explain
Concept: Importance of Means of Communication and Transportation
पद्य खंड पर आधारित निम्नलिखित प्रश्न का उत्तर लगभग 60 शब्दों में दीजिए:
'तोप' कविता के आधार पर 'तोप' और 'गौरेया' की प्रतीकात्मकता स्पष्ट करते हुए बताइए कि इस कविता के माध्यम से कवि क्या संदेश देना चाहता है?
Concept: तोप
Examine any five major challenges faced by the political parties in India.
Concept: Challenges to Political Parties
Which one of the following countries has two party system?
Concept: Number of Political Parties
“Democracy stands much superior to any other form of government in promoting the dignity and freedom of the individual.” Support the statement with arguments.
Concept: Dignity and Freedom of the Citizens
As Valli, make a diary entry sharing your joys and disappointments during the bus ride.
Concept: From the Diary of Anne Frank
पूरक पाठ्य पुस्तक पर आधारित निम्नलिखित प्रश्न का उत्तर लगभग 60 शब्दों में दीजिए -
हरिहर काका और टोपी शुक्ला दोनों ही भरे-पूरे परिवार से संबंधित होते हुए भी अकेले थे। दोनों के अकेलेपन के कारणों की समीक्षा कीजिए।
Concept: हरिहर काका
Why is the ‘tertiary sector’ becoming important in India? Explain any three reasons.
Concept: Primary, Secondary and Tertiary Sectors in India
"The economic strength of a country is measured by the development of manufacturing industries." Explain with examples.
Concept: Meaning and Importance of Manufacturing
Which one of the following countries has 'one party system'?
Concept: Number of Political Parties
On the given outline Political Map of India, identify the place marked as 'A' with the help of following information and write its correct name on the line marked near it:
The place where National Congress Session was held in September, 1920.
Concept: National Parties
