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Question
Sounds are tiny vibrations that can travel through air and other materials. The loudness of a sound is measured in decibels (db).
Typical sound level in decibels:
(1) Silence 0db
(2) Rustle of leaves 10 db
(3) Breathing 10 db
(4) Radio music inside home 50-60 db
(5) Loud television 70 db
(6) Road traffic Noise 60-90 db
(7) Powerful rock music 100 db
(8) Motor cycle 105 db
(9) Heavy truck traffic 90-100 db
(10) Wind in the trees 20 db
OR
Read the following information and prepare a fact life:
Delhi, capital of India, has an area of 1,483 sq.km. Haryana and U.P are its neighbours. It has a literacy rate of 81.7%: (males 87.3 %, females 74.7%). People generally speak Hindi, Punjabi, Urdu and English. It is known for its Roshnara festival Shalimar, Qutab, mango festivals, garden Tourism and winter carnival.
Solution
1)Sounds are tiny vibrations which can travel through air and other materials. The loudness of sound is measured in decibels (dB). Silence is the absence of sound. Therefore, figures in the bottom of the decibel scale are at 0 dB. There is a tie between rustling of leaves and breathing at 10 dB. The wind blowing in the trees measures 20 dB. Radio music played at home is 50–60 dB, whereas loud television is 70 dB. Road traffic noise and heavy truck traffic overlap each other at 60–90 dB and 90–100 dB, respectively. The highest decibels are recorded by powerful rock music sounds at 100 dB.
OR
1. Introduction: Delhi is the capital of India.
2. Area: It has an area of 1,483 sq km.
3. Neighbours: Haryana and UP are its neighbours.
4. Literacy rate: 81.7%
5. Literacy rate of males: 87.3%
6. Literacy rate of females: 74.7%
7. Languages spoken: Hindu, Punjabi, Urdu and English
8. Festivals: Roshnara, Shalimar, Qutub, Mango Festivals, Garden Tourism and Winter Carnival
