NCERT Solutions Exploring Society: India and Beyond Chapter 2 –43End-of-chapter exercises — Questions and activities

Book page 42 Updated on2026-09-05

Q1.
Match the instrument with the weather element it measures. (1) Hygrometer (2) Anemometer (3) Barometer (4) Thermometer (5) Rain gauge — (a) Precipitation (b) Atmospheric pressure (c) Wind direction and speed (d) Humidity (e) Temperature
Answer
Instrument usedElement of the WeatherUnit
(1) Hygrometer(d) Humidity% relative humidity
(2) Anemometer(c) Wind direction and speedkm/h
(3) Barometer(b) Atmospheric pressuremillibar (mb)
(4) Thermometer(e) Temperature°C (or °F)
(5) Rain gauge(a) Precipitationmillimetre (mm)
1 – d    2 – c    3 – b    4 – e    5 – a
Tip to remember them: The Greek roots give the answer away — hygros = wet (hygrometer), anemos = wind (anemometer), baros = weight (barometer), therme = heat (thermometer). A rain gauge needs no Greek at all.
A small caution: An anemometer alone measures wind speed; the direction is given by the wind vane or wind sock that is normally mounted on the same mast. The book pairs them together because at a weather station they always work as a pair.
Q2.
Jyotsna is deciding what clothes to pack for her school trip to Mumbai in June. She looks at the weather forecast, which predicts 29°C and 84% humidity. What would be your advice to her?
Answer

Read the two numbers together. 29°C on its own is not very hot — but 84% relative humidity is very high, so her sweat will hardly evaporate, and the day will feel far hotter and stickier than 29°C suggests. June in Mumbai is also the start of the monsoon, so heavy rain is likely.

29°C + 84% humidity → little evaporation → little cooling from sweat
→ it will feel hot, sticky and clammy, and washed clothes will take a very long time to dry

My advice to Jyotsna:

  • Pack light, loose, thin cotton clothes — light colours, and nothing tight. Cotton absorbs sweat and lets air through; synthetics and denim will feel awful.
  • Carry more changes of clothing than she thinks she needs, because damp clothes will not dry overnight in that humidity.
  • A raincoat or umbrella, and slippers or sandals that survive water — June is the monsoon month in Mumbai.
  • A plastic bag or waterproof pouch for books, phone and tickets, and a spare pair of dry footwear.
  • A water bottle — in humid heat you lose a lot of water through sweat even without feeling very hot.
  • No woollens. Mumbai in June has no need of them.
Why humidity, not temperature, is the deciding number here: Sweat cools the body only when it evaporates. In air that is already 84% full of water vapour, evaporation is very slow — so the body's cooling system barely works. That is why coastal Mumbai at 29°C feels more oppressive than Delhi at 35°C in a dry May.
Q3.
Imagine that a small group of students is setting up a rain gauge. Here are some options for the site. 1. The school vegetable garden. 2. The terrace of the school building. 3. Open ground with elevated platform. 4. Compound wall of school. 5. Verandah of the school laboratory. Discuss in your group and finalise the site. Write down the reasons for your decision.
Answer

Our group's decision: Site 3 — open ground with an elevated platform.

Reasons for choosing it:

  • It is open, so no tree, wall or roof overhead can block the rain or drip extra water in.
  • The elevated platform keeps the gauge above the ground, so mud does not splash into the funnel and water flowing over the ground cannot enter it.
  • A platform gives a flat, firm, level base, so the gauge stays upright and will not tilt or topple in the wind — exactly what the activity on page 34 insists on.
  • It is easy to reach at the same time every day, in the rain, without disturbing anyone.

Why we rejected the others:

SiteWhy it is not suitable
1. School vegetable gardenPlants overhead would intercept the rain; watering the garden would add water; the soft, dug soil would let the gauge tilt
2. Terrace of the school buildingWind is much stronger and more turbulent up there, so it blows rain across the mouth of the gauge and the reading comes out too low; the gauge could also topple
4. Compound wall of schoolA narrow, unstable perch; the wall shelters one side and splashes the other, and the gauge is likely to fall
5. Verandah of the school laboratoryIt is roofed. Almost no rain will reach the gauge at all — the reading would be meaningless
The rule behind all of this: A rain gauge must catch exactly the rain that would have fallen on that piece of ground — no more and no less. Anything that shelters it, splashes it, tilts it or exposes it to unusual wind will corrupt the reading. IMD standards go further still: the mouth of the gauge is kept about 30 cm above ground, on level open land, at least twice as far from any object as that object is tall.
Q4.
Below is a chart taken from IMD, Jammu and Kashmir. Looking at the data available, write a short script to report the weather conditions in different parts of Jammu and Kashmir on the date shown. (Hint: Cover the temperature range, maximum and minimum temperatures, humidity, precipitation, etc.) Note: ACT means actual; NOR means normal; DEP is departure from normal; R/F is rainfall; S/N is snowfall; TR means trace amount.
Answer

First, work out the range of temperature for each station (ACT max − ACT min):

StationMax (°C)Min (°C)Range (°C)Max DEP (°C)24-hr R/F (mm)24-hr S/N (cm)Humidity 0830 / 1730 (%)
Srinagar6.50.26.3−2.413.42.489 / 89
Qazigund3.2−0.43.6−5.336.222.097 / 90
Pahalgam1.1−4.15.2−4.519.423.096 / 96
Kupwara5.1−0.75.8−3.421.910.097 / 94
Kukernag2.6−1.44.0−4.035.230.096 / 97
Gulmarg−2.6−7.65.0−4.035.235.076 / 100
Muzafarabad8.55.62.925.893 / —

Sample answer — a radio/TV script for the evening bulletin of 1 February 2024:

“Good evening. Here is the weather report for Jammu and Kashmir for today, the first of February 2024, prepared from the evening data of the India Meteorological Department.

It has been a cold, wet and snowy day across the Valley, with every station reporting a maximum temperature below its normal for the date. Srinagar recorded a maximum of 6.5°C — 2.4 degrees below normal — and a minimum of 0.2°C, giving a range of 6.3 degrees. Kupwara reached 5.1°C and dipped to −0.7°C, while Qazigund managed only 3.2°C, a full 5.3 degrees below its normal, with a night minimum of −0.4°C.

The high hill stations were colder still. Pahalgam had a maximum of 1.1°C and a minimum of −4.1°C, and Kukernag 2.6°C and −1.4°C. Gulmarg was the coldest place in the region — the temperature there did not rise above freezing at all, with a maximum of −2.6°C and a bitter minimum of −7.6°C. Across the border in Muzafarabad it was the mildest, 8.5°C by day and 5.6°C at night — the smallest day–night range of all our stations, at just 2.9 degrees.

There was widespread precipitation in the twenty-four hours ending at 8:30 this morning. Qazigund led with 36.2 mm of rain and 22 centimetres of snow; Kukernag received 35.2 mm and 30 centimetres of snow; and Gulmarg recorded the heaviest snowfall, 35 centimetres, with 35.2 mm of rain. Pahalgam had 19.4 mm and 23 centimetres of snow, Kupwara 21.9 mm and 10 centimetres, and Muzafarabad 25.8 mm of rain. Srinagar was the least affected, with 13.4 mm of rain and 2.4 centimetres of snow. Fresh precipitation continued through the day at most stations, though Srinagar reported only a trace amount between half past eight this morning and half past five this evening.

The air has been very damp everywhere. Morning relative humidity was between 76 and 97 per cent, and by evening Gulmarg had reached 100 per cent — saturated air — while Kukernag was at 97 and Pahalgam at 96 per cent. Srinagar held steady at 89 per cent through the day.

In short: a cold, overcast and snowy day, colder than usual for the season, with heavy fresh snow in the higher reaches. Travellers on the Jammu–Srinagar highway and near Gulmarg and Pahalgam should check road conditions before setting out, and residents are advised to guard against the cold. Good night.”

How to read the DEP column: DEP is the departure from normal — how far today was from the average for that date. Every maximum-temperature DEP here is negative, which is the single clearest fact in the table: this was a colder-than-normal day right across the region. Interestingly the minimum-temperature DEPs are positive, because the thick cloud cover that brought the snow also acted like a blanket and stopped the night from getting as cold as it usually does.
Tip: Muzafarabad's row has dashes in the NOR and DEP columns — normals are not available for that station, so no departure can be calculated. In a real bulletin you say so rather than leaving it out.
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