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A star sometimes appears brighter and some other times fainter. What is this effect called? State the reason for this effect.
Concept: Atmospheric Refraction
A student cannot see a chart hanging on a wall placed at a distance of 3 m from him. Name the defect of vision he is suffering from. How can it be corrected? Draw ray diagrams for the (i) defect of vision and also (ii) for its correction.
Concept: Defects of Vision and Their Corrections > Myopia
In the following diagram showing dispersion of white light by a glass prism, the colours 'P' and 'Q’ respectively are:
Concept: Dispersion of Light Through a Prism
Two metallic spheres A and B kept on insulating stands are in contact with each other. A positively charged rod P is brought near the sphere A as shown in the figure. The two spheres are separated from each other, and the rod P is removed. What will be the nature of charges on spheres A and B?
Concept: Ohm's Law
A metal sphere is kept on an insulting stands. A negatively charged rod is brought near it, then the sphere is earthed as shown. On removing the earthing, and taking the negatively charged rod away, what will be the nature of charge on the sphere? Give reason for your answer.
Concept: Ohm's Law
Solve the following question:
In an electric circuit, two resistors of 12 0 each are joined in parallel to a 6 V battery. Find the current drawn from the battery.
Concept: Resistance of a System of Resistors >> Resistors in Parallel
An electric motor rated 1100 W is connected to 220 V mains. Find:
- The current drawn from the mains,
- Electric energy consumed if the motor is used for 5 hours daily for 6 days.
- Total cost of energy consumed if the rate of one unit is 5.
Concept: Electric Circuit
Let the resistance of an electrical device remain constant, while the potential difference across its two ends decreases to one fourth of its initial value. What change will occur in the current through it? State the law which helps us in solving the above stated question.
Concept: Ohm's Law
Which type of soil is most suitable for growing the crop of cashew nut?
Concept: Types of Soil
Which type of soil in India is most widespread and important?
Concept: Types of Soil
"Average income is useful for comparison but it may hide disparities." Support the statement with suitable arguments.
Concept: Concept of Growth of National Income
Answer the following question.
How does the idea of power-sharing emerge? Explain different forms that have common arrangements of power-sharing.
Concept: Concept for Power Shared in Democracies
Describe any five factors that make democracy is a better form of government than other alternatives.
Concept: Democracy Accommodate Different Social Groups
Evaluate the strengths and limitations of local self-government in a democracy.
Concept: Concept for Power Shared in Democracies
Evaluate the power-sharing system in India.
Concept: Concept for Power Shared in Democracies
What was the main aim of the French revolutionaries?
Concept: Nationalist Movement in Indo- China >> Phases of Struggle Against the French
What is the meaning of concentration camps?
Concept: Rise of Nationalism in Europe >> Characteristics of the Movements in Poland, Hungary,Italy, Germany and Greece
How did nationalism develop through culture in Europe? Explain.
Concept: Rise of Nationalism in Europe >> Growth of Nationalism in Europe After the 1830s.
How did Paul Bernard argue in favour of economic development of Vietnam? Explain.
Concept: Nationalist Movement in Indo- China >> America and the Vietnam War
How did ‘Salt March’ become an effective tool of resistance against colonialism? Explain
Concept: Introduction to Nationalism in India >> Salt Satyagraha
