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Climate and weather - class-VII

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Which among the following is India's first state to release a Climate Change Action Plan?

  1. Himachal Pradesh

  2. Delhi

  3. Haryana

  4. Kerala


Correct Option: B

In the Northern Hemisphere, this day has the fewest hours of daylight:

  1. Summer solstice

  2. Winter solstice

  3. Vernal equinox

  4. Autumnal equinox


Correct Option: B

___________ is a long term pattern of weather at a particular area.

  1. Raising sun

  2. Climate

  3. Setting sun

  4. Rainbow


Correct Option: B

In the mountains, there is lot of moisture and water and still the plants are xerophytes, because

  1. Water turns into snow on mountains

  2. Water runs away due to the presence of slopes and can not be used by plant (physiological dryness)

  3. Rocks of mountains cannot absorb water

  4. None of them is correct


Correct Option: B
Explanation:

(b) Steep slopes cause fast, running of water which result in erosion and do not Permit the accumulation of hymns so the soil cordless denjuded` In sulked soil plants cannot grow properly and vegetation changes into xerophytic plants. In valleys humus accumulates, so they have luxuriant vegetation and slopes contain xerophytic Plants.




Perspiration cools the body by

  1. Advective heat transfer

  2. Radiative heat transfer

  3. Conductive heat transfet

  4. Latent heat transfer


Correct Option: D

The weather reports use thermometer to measure the

  1. Minimum temperature

  2. Maximum temperature

  3. Maximum and minimum temperature

  4. None of the above


Correct Option: C

The range of temperature between -10 to -110 degree celsius is of

  1. Clinical thermometer

  2. Weather thermometer

  3. Laboratory thermometer

  4. All of the above


Correct Option: C

Temperature of a particular region determines the 

  1. Distribution of flora

  2. Distribution of fauna

  3. Texture of soil

  4. Both A and B


Correct Option: D

A weather report gives details of which of the following?

  1. Past 24 hours

  2. Weather for the day

  3. Weather for a year

  4. Both option A and B


Correct Option: D

Which of the following records everyday temperature?

  1. Maximum thermometer

  2. Minimum thermometer

  3. Maximum-minimum thermometer

  4. None of the above


Correct Option: C

The temperature scale where 0o represents freezing and $100^{o}$ boiling :

  1. Fahrenheit

  2. Celsius

  3. Kelvin

  4. Absolute


Correct Option: B

Suppose saturated polar air has an air temperature and dew point of $-10^{o}C$, and unsaturated desert air has an air temperature of $35^{o}C$ and a dew point of $10^{o}C$. The desert air contains ____________ water vapor and has a ____________ relative humidity than the polar air.

  1. More, lower

  2. More, higher

  3. Less, lower

  4. Less, higher


Correct Option: A

The time of day when the relative humidity reaches a maximum value is usually:

  1. At the time when the air temperature is highest

  2. In the middle of the afternoon

  3. At the time when the air temperature is lowest

  4. Just before sunrise


Correct Option: C

Humidity influences corrosive action of

  1. Air pollutants

  2. Water Pollutants

  3. Solid material

  4. All of above


Correct Option: A

Which of the following weather elements always decreases as we climb upward in the atmosphere?

  1. Wind

  2. Temperature

  3. Pressure

  4. Moisture


Correct Option: C

If the air temperature remains constant, evaporating water into the air will _____________ the dew point and ___________ the relative humidity.

  1. Increase, increase

  2. Increase, decrease

  3. Decrease, increase

  4. Decrease, decrease


Correct Option: A

The density of water vapor in a given parcel of air is expressed by the:

  1. Absolute humidity

  2. Relative humidity

  3. Mixing ratio

  4. Specific humidity


Correct Option: A

Which of the following will increase in a rising parcel of air?

  1. Saturation vapor pressure

  2. Relative humidity

  3. Mixing ratio

  4. Air temperature


Correct Option: B

As the air temperature increases, with no addition of water vapor to the air, the relative humidity will:

  1. Remain the same

  2. Increase

  3. Decrease

  4. Increase until it becomes equal to the dew point temperature


Correct Option: C

Which of the following will decrease in a rising parcel of air?

  1. Relative humidity

  2. Absolute humidity

  3. Specific humidity

  4. All of the above


Correct Option: B

The atmosphere near the earth's surface is "heated from below." Which of the following does not significantly contribute to this heating?

  1. Conduction of heat upward from a hot surface

  2. Convection from a hot surface

  3. Absorption of infrared energy that has been radiated from the surface

  4. Heat energy from the earth's interior


Correct Option: D

A change of one degree on the Celsius scale is _____________ a change of one degree on the Fahrenheit scale.

  1. Equal to

  2. Larger than

  3. Smaller than

  4. Is in the opposite direction of


Correct Option: B

When a liquid thermometer is held in direct sunlight,

  1. It will accurately measure the air temperature

  2. It will measure a much higher temperature than that of the air

  3. It will measure a much lower temperature than that of the air

  4. It will measure the temperature of the sun rather than the air


Correct Option: B

Assertion : The crown fires are most destructive as they burn the tree top.

Reason : Due to crown fire the temperature of that area may rise upto 700oC.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true


Correct Option: A
Explanation:

Crown files are most destructive. These destroy the canopies of trees and entire vegetational cover of that particular area. Due to this fire, the temperature, rises upto 700()oC and may adversely effect the nearly vegetation.

During summer, if you go near the lake, you feel relief from the heat, why?

  1.  With no pressure over the lake and low pressure over land, the regional pressure gradient pushes cool winds towards the land.

  2.  With high pressure over the lake and low pressure over land, the regional pressure gradient pushes cool winds towards the land.

  3.  With no pressure over the lake and high pressure over land, the regional pressure gradient pushes cool winds towards the land.

  4.  With high pressure over the lake and zero pressure over land, the regional pressure gradient pushes cool winds towards the land.


Correct Option: B
Explanation:

During summer, there occurs differential heating of the land and the water body near the land. The land mass is heated up quickly and the air over the land rises up, creating low pressure over the land. The water body takes time in getting heated up and so during the day, the water body has higher pressure due to heavy air than the land mass. Due to the pressure difference, the wind blows from the high pressure (water body) to the low pressure (land mass). These are called the sea-breeze. These winds are colder and that's why relief is felt near the lake on a hot summer day.

Hence, the correct answer is 'with high pressure over the lake and low pressure over the land, the regional pressure gradient pushes cool winds towards the land'.

Why does weather change frequently?

  1. Because of humidity

  2. Because of temperature

  3. Because of rainfall

  4. All of the above


Correct Option: D

The unit of humidity is 

  1. Degree celsius

  2. Percentage

  3. Kelvin

  4. Percent per litre


Correct Option: B
Explanation:

The unit of relative humidity is the percentage. It is the ratio of the current absolute humidity to the maximum humidity for that temperature. A hygrometer is a device which is used measure relative humidity. When the air is fully saturated with water vapor and cannot hold any more water vapor, the relative humidity is 100%. 

Thus, the correct answer is option B.

A weather report gives details of which of the following?

  1. Past 24 hours

  2. Weather for the day

  3. Weather for a year

  4. Both A and B


Correct Option: B

The special thermometer used to record temperature is called as

  1. Maximum thermometer

  2. Minimum thermometer

  3. Maximum-minimum thermometer

  4. None of the above


Correct Option: C

If one litre of water at $\displaystyle { 25 }^{ \circ  }C$ is mixed with one litre of water at $\displaystyle { 45 }^{ \circ  }C$ the temperature of the water will be

  1. $\displaystyle { 70 }^{ \circ }C$

  2. $\displaystyle { 20 }^{ \circ }C$

  3. $\displaystyle { <25 }^{ \circ }C$

  4. $\displaystyle >{ 25 }^{ \circ }C&amp; <{ 45 }^{ \circ }C$


Correct Option: D
Explanation:

The temperature of the mixture would be $\displaystyle >{ 25 }^{ \circ  }C&amp; <{ 45 }^{ \circ  }C$, as there would be transfer of heat in between  water molecules from higher temperature to lower temperature.

High wind location in India are 

  1. Gujarat

  2. Madhya Pradesh

  3. Tamil Nadu

  4. All


Correct Option: D
Explanation:

High wind location in India are 
1) Gujarat 
2) MP 
3) Tamil Nadu 
4) Coastal area 
5) Bay of Bengal 
6) Some parts of Rajasthan 
7) Some parts of Karnataka .

Which of the following departments prepare weather reports?

  1. Pollution department

  2. Health department

  3. Meteorological department

  4. Environment department


Correct Option: C
Explanation:

  • The Indian Meteorological Department is an agency of the Ministry of Earth Sciences of the Government of India. It is the principal agency responsible for meteorological observations, weather forecasting, prepare weather reports and seismology (the study of earthquakes).
  • It has the responsibility for forecasting, naming and distribution of warnings for tropical cyclones in the Northern Indian Ocean region.
So, the correct answer is 'Meteorological department'.

What chemical reaction takes place when chemicals from rocks dissolved in water?

  1. Chemical Weathering

  2. Physical weathering

  3. Weathering

  4. Rock cycle


Correct Option: A

"Green Climate Fund" was proposed in which of the following environment conferences?

  1. 2009 United Nations Climate Change Conference

  2. 2010 United Nations Climate Change Conference

  3. 2010 G-20 Seoul summit

  4. None of them


Correct Option: B

Meteorology is considered a branch of:

  1. Mineralogical sciences

  2. Phenology

  3. Phrenology

  4. Atmospheric sciences


Correct Option: D

The unit of pressure most commonly found on a surface weather map is:

  1. Inches of mercury (Hg)

  2. Millibars or hectopascals

  3. Pounds per square inch

  4. Millimeters of mercury (Hg)


Correct Option: B

If the air temperature increased, with no addition or removal of water vapor, the actual vapor pressure would:

  1. Increase

  2. Decrease

  3. Stay the same

  4. Become greater than the saturation vapor pressure


Correct Option: C

Which of the following statements is not correct?

  1. The length of human hair changes as the relative humidity changes.

  2. During the winter, low relative humidity can irritate the mucus membranes in the nose and throat.

  3. The relative humidity is a measure of the air's actual water vapor content.

  4. A change in the air temperature can change the relative humidity.


Correct Option: C

When clouds are viewed near the horizon, the individual cloud elements usually:

  1. Appear closer together than is actually the case

  2. Appear farther apart than is actually the case

  3. Appear lighter in color than is actually the case

  4. Appear to have more vertical development than is actually the case


Correct Option: A

The instrument that measures temperature, pressure, and humidity at various altitudes in the atmosphere:

  1. Barograph

  2. Radiosonde

  3. Aneroid barometer

  4. Altimeter


Correct Option: B

At what time of day is the relative humidity normally at a minimum?

  1. When the air temperature is highest

  2. Just before sunrise

  3. About midnight

  4. When the air temperature is lowest


Correct Option: A

If very cold air is brought indoors and warmed with no change in its moisture content, the saturation vapor pressure of this air will __________ and the relative humidity of this air will ___________ .

  1. Increase, increase

  2. Decrease, decrease

  3. Increase, decrease

  4. Decrease, increase


Correct Option: C

Which statement(s) below is/are correct?

  1. Valleys are more susceptible to radiation fog than hill tops

  2. Without the summer fog along the coast of California, redwoods would not grow well there

  3. Fog can be composed of ice crystals

  4. All of the above are correct


Correct Option: D

Our seasons are caused by:

  1. The changing distance between the earth and the sun

  2. The angle at which sunlight reaches the earth

  3. The length of the daylight hours

  4. Only (b) and (c) are correct


Correct Option: D

The percentage of water vapor present in the air compared to that required for saturation is the:

  1. Mixing ratio

  2. Absolute humidity

  3. Dew point

  4. Relative humidity


Correct Option: D

To some extent viability of pollen grains depends on prevailing temperature and humidity.

  1. True

  2. False


Correct Option: A
Explanation:
  • The period for which pollen grains remain viable is highly variable and to some extent depends on the prevailing temperature and humidity. 
  • The pistil is developed and ovules reach maturity before the pollen grains are ripe. Hybrid seed production as soon as tomato hybrid cultivars gained popularity, ordinary conditions of storage pollen viability can hardly be retained.
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