Service sector in India employs two different kinds of people.
[question] Question. Service sector in India employs two different kinds of people. Who are these? [/question] [solution] Solution: Service sector in India employs two different kinds of people. These are primary and ancillary workers. Primary workers include those who directly provide services while ancillary workers are composed of those who give services to the service providers. For example, consultants make available their services to consultancy firms etc. [/solution]...
Read More →A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower.
[question] Question. A stone is dropped from the top of a tower $500 \mathrm{~m}$ high into a pond of water at the base of the tower. When is the splash heard at the top ? Given, $g=10 \mathrm{~ms}^{-2}$; speed of sound $=$ $340 \mathrm{~m} / \mathrm{s} .$ [/question] [solution] Solution: For the downward journey of stone, Initial velocity, $\mathrm{u}=0$ Distance travelled, s = height of tower = 500 m Time of fall, $\mathrm{t}_{1}=?$ Acceleration due to gravity, $\mathrm{g}=10 \mathrm{~ms}^{-2}...
Read More →“Tertiary sector is not playing any significant role in the development of Indian economy.
[question] Question. “Tertiary sector is not playing any significant role in the development of Indian economy.” Do you agree? Give reasons in support of your answer. [/question] [solution] Solution: “Tertiary sector is not playing any significant role in the development of the Indian economy”. This statement is not true. The tertiary sector has contributed vastly to the Indian economy, especially in the last two decades. In the last decade, the field of information technology has grown, and con...
Read More →What are trophic levels?
[question] Question. What are trophic levels? Give an example of a food chain and state thedifferent trophic levels in it. [/question] [solution] solution: Trophic levels : The distinct sequential steps in the food chain where transfer of energy occurs are referred to as different trophic levels. [/solution]...
Read More →Why has India a rich heritage of flora and fauna?
[question] Question. Why has India a rich heritage of flora and fauna? [/question] [solution] Solution: India has all the major physical features of the Earth, i.e., mountains, plains, deserts, plateaus and islands. The different regions of the country have different soil types. Though India has an essentially monsoon-type of climate, there exists great variations in humidity and temperature across the country. Even the rains brought by the monsoon winds are unevenly distributed. Hence, each fac...
Read More →Quite a few species of plants and animals are endangered in India.
[question] Question. Quite a few species of plants and animals are endangered in India. Why? [/question] [solution] Solution: Due to the excessive exploitation of the plant and animal resources by human beings, the ecosystem has been disturbed. In consequence, about 1,300 plant species are endangered and 20 species are extinct. Quite a few animal species are also endangered and some have become extinct. Apart from hunting, other factors that have caused endangerment of plant and animal species a...
Read More →Distinguish between open unemployment and disguised unemployment.
[question] Question. Distinguish between open unemployment and disguised unemployment. [solution] Solution: Open unemployment is when a person has no job in hand and does not earn anything at all. Disguised unemployment, on the other hand, is mostly found in the unorganised sector where either work is not consistently available or too many people are employed for some work that does not require so many hands. This is the essential difference between open unemployment and disguised unemployment. ...
Read More →Give any two ways in which non-biodegradable
[question] Question. Give any two ways in which non-biodegradable substances would affect the environment. [/question] [solution] solution: (i) Non-biodegradable substances contaminate soil and water resources as they cannot be decomposed. (ii) They may be radioactively active which have hazardous effects to human beings. [/solution]...
Read More →Name different types of vegetation found in India and describe the vegetation of high altitudes.
[question] Question. Name different types of vegetation found in India and describe the vegetation of high altitudes. [/question] [solution] Solution: The different types of vegetation found in India are: (i) Tropical Evergreen Forests (ii) Tropical Deciduous Forests (iii) Tropical Thorn Forests and Scrubs (iv) Montane Forests (v) Mangrove Forests A description of the vegetation of high altitudes: In mountainous regions, there is a succession of natural vegetation belts in the same order as we s...
Read More →Give two practical applications of reflection of sound waves.
[question] Question. Give two practical applications of reflection of sound waves. [/question] [solution] Solution: (i) Megaphones which are designed to send sound waves in particular direction are based on the reflection of sound. (ii) In stethoscope the sound of patient’s heartbeat reaches the doctor’s ears by multiple reflection in the tubes. [/solution]...
Read More →Distinguish between
[question] Question. Distinguish between (i) Flora and fauna (ii) Tropical evergreen and deciduous forests [/question] [solution] Solution: (i) Flora: This term denotes the species of plants of a particular region or period Fauna: This term denotes the species of animals of a particular region or period. (ii) [/solution]...
Read More →What do you understand by disguised unemployment? Explain with an example each from the urban and rural areas.
[question] Question. What do you understand by disguised unemployment? Explain with an example each from the urban and rural areas. [/question] [solution] Solution: Disguised unemployment is a form of underemployment where one has a job but the work is divided. It is not apparent as compared to someone without a job who is clearly unemployed. In rural areas, this can be seen in the farming community where all members of a family might be working on a farm even though so many hands are not requir...
Read More →When a sound is reflected from a distant object, an echo is produced.
[question] Question. When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remain the same. Do you hear echo sound on a hotter day ? [/question] [solution] Solution: If the temperature rises, the speed of sound will increase. Thus, the time taken by the sound to reach initial point decreases. That is, it will be certainly less than 0.1 s (the sensation of sound persists in our brain for about 0.1 s...
Read More →How is the tertiary sector different from other sectors?
[question] Question. How is the tertiary sector different from other sectors? Illustrate with a few examples. [/question] [solution] Solution: The tertiary sector is different from the other sectors because it does not manufacture or produce anything. For this reason, it is also known as the service sector. It aids the primary and secondary sectors in development. The tertiary sector involves services like transport, storage of goods, communications, banking and administrative work. [/solution]...
Read More →Answer the following questions briefly.
[question] Question. Answer the following questions briefly. (i) Define an ecosystem. (ii) What factors are responsible for the distribution of plants and animals in India? (iii) What is a bio-reserve? Give two examples. (iv) Name two animals having habitat in tropical and montane type of vegetation. [/question] [solution] Solution: (i) Ecosystem is a system of interdependence comprising the physical environment and the organisms living therein. (ii) Temperature, humidity, precipitation, land an...
Read More →Give any two ways in which biodegradable substances
[question] Question. Give any two ways in which biodegradable substances would affect the environment. [/question] [solution] solution: (i) If biodegradable substances are not degraded properly on right time , They will be accumulated and will act as pollutant. (ii) They are used in composting which forms humus that enhances soil fertility. [/solution]...
Read More →Choose the right answer from the four alternatives given below.
[question] Question. Choose the right answer from the four alternatives given below. (i) To which one of the following types of vegetation does rubber belong? (a) Tundra (c) Himalayan (b) Tidal (d) Tropical Evergreen (ii) Cinchona trees are found in the areas of rainfall more than (a) 100 cm (c) 70 cm (b) 50 cm (d) less than 50 cm (iii) In which of the following states is the Simlipal bio-reserve located? (a) Punjab (c) Delhi (b) Orissa (d) West Bengal (iv) Which one of the following bio-reserve...
Read More →Does sound follow the same laws of reflection as light does ? Explain
[question] Question. Does sound follow the same laws of reflection as light does ? Explain [/question] [solution] Solution: Yes, sound and light follow the same laws of reflection given below : (a)Angle of incidence = Angle of reflection. (b)The incident sound wave, the normal and the reflected sound wave lie in the same plane. [/solution]...
Read More →Make a long list of all kinds of work that you find adults around you doing for a living. In what way can you classify them?
[question] Question. Make a long list of all kinds of work that you find adults around you doing for a living. In what way can you classify them? Explain your choice. [question] [solution] Solution: Attempt this question on your own. [/solution]...
Read More →Why are some substances biodegradable
[question] Question. Why are some substances biodegradable and some non-biodegradable? [/question] [solution] solution: [/solution]...
Read More →For each of the sectors that we came across in this chapter why should one focus on employment and GDP?
[question] Question. For each of the sectors that we came across in this chapter why should one focus on employment and GDP? Could there be other issues which should be examined? Discuss. [/question] [solution] Solution: For each of the sectors that we came across in this chapter, one should focus on employment and GDP because these determine the size of a country’s economy. A focus on employment and GDP helps determine two important things—per capita income and productivity. Hence, in each of t...
Read More →The frequency of a source of sound is 100 Hz.
[question] Question. The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute ? [/question] [solution] Solution: No. of vibrations produced in 1 s = 100 $\therefore$ No. of vibrations produced in 1 minute i.e., 60 seconds = 100 × 60 = 6000. Thus, the source of sound vibrates 6000 times in a minute. [/solution]...
Read More →Do you think the classification of economic activities into primary, secondary and tertiary is useful? Explain how.
[question] Question. Do you think the classification of economic activities into primary, secondary and tertiary is useful? Explain how. [/question] [solution] Solution: The classification of economic activities into primary, secondary and tertiary is useful on account of the information it provides on how and where the people of a country are employed. Also, this helps in ascertaining as to which sector of economic activity contributes more or less to the country’s GDP and per capita income. If...
Read More →Now think why
[question] Question. Now think why — Tiruvananthapuram has equable climate? — Chennai has more rains only after the fury of monsoon is over in most parts of the country? — Jodhpur has a hot desert type of climate? — Leh has moderate precipitation almost throughout the year? — While in Delhi and Jodhpur most of the rain is confined to nearly three months, in Tiruvanantapuram and Shillong it is almost nine months of the year? In spite of these facts see carefully if there are strong evidences to c...
Read More →A research scholar looked at the working people in the city of Surat and found the following.
[question] Question. A research scholar looked at the working people in the city of Surat and found the following. Complete the table. What is the percentage of workers in the unorganised sector in this city? [/question] [solution] Solution: The percentage of workers in the unorganised sector in this city is 70%. [/solution]...
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