Environmental Science

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GPS originally designed for ?

A)
For direction of air

B)
Real time and navigation

C)
Temperature of water

D)
Gravitational force


Correct Answer :

Real time and navigation


Explanation :

The Global Positioning System (GPS) is a network of about 30 satellites orbiting the Earth at an altitude of 20,000 km. Once it has information on how far away at least three satellites are, your GPS receiver can pinpoint your location using a process called trilateration.


GPS is a system. It’s made up of three parts: satellites, ground stations, and receivers. receiver calculates its distance from four or more satellites, it knows exactly where you are.

Absolute humidity in air ?

A)
Remain constant at all altitudes

B)
Increases at higher altitudes

C)
Decreases at higher altitudes

D)
None of these


Correct Answer :

Decreases at higher altitudes


Explanation :

Humidity - or moist - is the water vapor present in air where commonly used terms are Absolute, Specific and Relative Humidity.
It is expressed as grams of moisture per cubic meter of air (g/m3). The maximum absolute humidity of warm air at 30°C/86°F is approximately 30g of water vapor - 30g/m3.

Permanent hardess of water is due to?

A)
Magnesium bicarbonate

B)
Calcium bicarbonate

C)
Calcium sulphate

D)
Calcium hydroxide


Correct Answer :

Calcium sulphate


Explanation :

Hard water contains dissolved magnesium and calcium ions. These make it more difficult for the water to form a lather with soap. Temporary hardness is caused by dissolved calcium hydrogencarbonate (which is removed by boiling). Permanent hardness is caused by dissolved calcium sulfate (which is not removed by boiling).

Which they of irrigation system usually achieves to greatest "field water efficiency" ?

A)
Micro or drip irrigation

B)
Level basin irrigation

C)
Furrow irrigation

D)
None of these


Correct Answer :

Micro or drip irrigation


Explanation :

Drip (or micro) irrigation, also known as trickle irrigation, functions as its name suggests. In this system water falls drop by drop just at the position of roots. Water is delivered at or near the root zone of plants, drop by drop. This method can be the most water-efficient method of irrigation. if managed properly, since evaporation and runoff are minimized. The field water efficiency of drip irrigation is typically in the range of 80 to 90 percent when managed correctly.

"World water day" is celebrated on?

A)
16th September

B)
22nd march

C)
2nd February

D)
14th January


Correct Answer :

16th September

What kind of energy does a wind turbine use?

A)
Kinetic energy

B)
Potential energy

C)
Chemical energy

D)
Thermal energy


Correct Answer :

Kinetic energy

Hydrogen can be stored as a?

A)
Compressed gas

B)
Liquid

C)
Metal hydride

D)
All options are correct


Correct Answer :

Compressed gas

The term Biodiversity was coined by?

A)

G. Rosen


B)

M. Calvin


C)

Mendel


D)

Hymen L.H



Correct Answer :

G. Rosen


Explanation :

The term 'Biodiversity' was coined by Walter G. Rosen in the year 1985, a short version of 'Biological Diversity', which was introduced by Thomas Lov in 1980.

Edaphic factor is related with?

A)

Wind


B)

Soil


C)

Rainfall


D)

Temperature



Correct Answer :

Soil


Explanation :

edaphic factor (salinity, pH, Na+, K+, Ca++, CaCO3, water holding capacity, and grain size) includes the physical, chemical, and biological properties of soil

A grass land having Scattered trees is known as?

A)

Plains


B)

Prairies


C)

Pampas


D)

Savannah



Correct Answer :

Savannah

Who is known as Indian father of ecology?

A)

Ramdeo Misra


B)

Ramdev Baba


C)

C.N.Rao


D)

H.G. Khurana



Correct Answer :

Ramdeo Misra


Explanation :

Ramdeo Misra (1908-1998) was known as the father of ecology in India for his contribution, he laid the foundation of ecology and environmental science in the country.

The largest Mangrove forest of the world is ?

A)

Pichavaram Mangrove forest


B)

Godavari Krishna Mangrove forest


C)

Sundarban Mangrove forest


D)

Baratang Island Mangrove forest



Correct Answer :

Sundarban Mangrove forest


Explanation :

Sundarban is the largest mangrove forest in the world, which is spread across India and Bangladesh.

It is the world’s largest natural river delta formed by the Ganges, Hooghly, Padma, Brahmaputra and Meghna rivers.

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Ratio and Proportion

175 men can dig a canal of 3150 meters long in 36 days. How many men are required to dig a canal of 3900 meters long in 24 days?

24 men working at 8 hours a day can do a piece of work in 15 days. In how many days can 20 men working at 9 hours a day do the same work?

10 men can lay a road of 75 Km long in 5 days. In how many days can 15 men lay a road of 45 Km long?

Rice costing Rs. 480/- is needed for 8 members for 20 days. What is the cost of rice required for 12 members for 15 days?

The mess charge for 35 students for 24 days is Rs. 6300/-. In how many days will the mess charges be Rs. 3375/- for 25 students?

Time and Work

18 men can dig a well in 10 days. After they have worked for 4 days, how many more men shall be employed to complete the work in 4 days from then?

If 80 men can do a piece of work in 10 days, how many men are required to do the same work in 4 days?

If 80 men can do a piece of work in 10 days, in how many days can 40 men do the same piece of work?

General Computer Knowledge

What kind of material does ‘IC’ in computers made of?

Physics

The force required to produce an acceleration of 4 m/s2 in an object of mass 9 kg is?

Biology

Some seeds have hooks and spines. It helps the seeds to__________?

Physics

Which of the following modes of heat transfer is faster?

Agriculture

Which of the following reproduces from underground stem?

Botany

Lichens are a symbiotic association of?

Physics

The unit of relative density is?

Problems on Ages

The ages of Gyanendra and Jitendra are in the ratio of 12:7 respectively. After 6 years, the ratio of their ages will be 3:2 respectively . find the difference in their ages?

Time and Work

X can do a piece of work in 20 days, while Y can do in 10 days. If Y worked at it for 8 days,then X can finish the remaining work in______.?

Coding-Decoding

In a certain code, BELIEF is written as AFKKDI. How is SELDOM written in that code?