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In whitewash Calcium hydroxide is present.Calcium hydroxide reacts slowly with the carbon dioxide in air to form a thin layer of calcium carbonate on the walls. Calcium carbonate is formed after two to three days of white washing and gives a shiny finish to the walls.
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Yogita Ingle 6 years ago
Respiratory system in human beings:
The respiratory system in human beings consists of the nose, pharynx, larynx, trachea, bronchi and lungs.
- Air is taken in through the nostrils.
- Nostrils further continue into the nasal cavity.
- There is a bony plate called the palate, which separates the oral cavity from the nasal cavity.
- Nasal cavity opens into the pharynx.
- The pharynx is a muscular chamber acting as a common passage for the windpipe or trachea and the food pipe or oesophagus.
- It is connected to the larynx through a slit-like opening called the glottis.
- The larynx connects the pharynx to the trachea.
- The trachea shows the presence of cartilaginous rings.
- The cartilaginous rings provide flexibility thus, facilitating continuous air flow.
- The inner wall of the trachea is lined by a mucous membrane consisting of ciliated columnar epithelium.
- The trachea divides into two branches or tubes called bronchi, one of which enters the right lung and the other enters the left lung.
- The bronchi have cartilaginous rings for distention.
- Each bronchus divides into fine secondary bronchi. These bronchi further divide into finer tertiary bronchi. In the lungs, each bronchus finally divides into finer and smaller branches called bronchioles.
- The bronchioles further divide to form smaller terminal bronchioles.
- The bronchioles divide repeatedly to form a cluster of tiny air chambers called air sacs or alveoli.
- Alveoli have thin and moist walls which enable gaseous diffusion with blood capillaries.
- The lungs are a pair of spongy and elastic respiratory organs protected by a bony rib cage.
- The base of the lungs rests on the diaphragm.
- Each lung is covered by two membranes. The inner membrane is called the inner or visceral pleura and the outer membrane is called the outer or parietal pleura.
- The diaphragm is a curved, musculo-fibrous sheath which separates the thoracic cavity from the abdominal cavity.
- The diaphragm plays a major role during respiration.
Posted by Arif Ali 6 years ago
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Yogita Ingle 6 years ago
we have f = 15cm
we use the relations between radius and focal length
i. e R = 2F
putting the value of focal length (f) i.e.15cm(given)
we get that R = 30cm
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Yogita Ingle 6 years ago
The prime factorization of 11008 is
2|11008
2|5504
2|2752
2|1376
2|688
2|344
2|172
2|86
43|43
1
11008=2×2×2×2×2×2×2×2×43
11008=2 × 8×43
The prime factorization of 7344 is
2|7344
2|3672
2|1836
2|918
3|459
3|153
3|51
17|17
1
7344=2×2×2×2×3×3×3×17
7344=2 × 4×3 × 3×17
Now, HCF=Product of the smallest power of each common
prime factor in the numbers.
HCF=2 × 4=16
LCM = Product of the greatest power of each prime factor,
involved in the numbers.
LCM=2 × 8×43×3 × 3×17=256×43×27×17=5052672
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Tarun Sharma 5 years, 11 months ago
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