306
Q:

Which one of the following types of waves are used in a night vision apparatus?

A) Radio waves B) Microwaves
C) Infra-red waves D) None of the above

Answer:   C) Infra-red waves



Explanation:
Subject: General Science
Q:

Which one of the following statements concerning the natural vegetation of India is not correct?

A) Sal is found in moist deciduous forests. B) Casuarina is largely found along the coastal region of Tamil Nadu.
C) Deodar is a coniferous species of tree. D) Shola forests are found mainlyon the upper reaches of Himalaya.
 
Answer & Explanation Answer: D) Shola forests are found mainlyon the upper reaches of Himalaya.

Explanation:

The temperate forests are called Sholas in the Nilgiris, Anaimalai and Palani hills.Moist deciduous forests: Major Species: Teak, sal, shisham, hurra, mahua, amla, semul, kusum, and sandalwood etc. are the main species of these forests.

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1 8
Q:

Which one of the following is not related to wind erosion ?

A) Wind gap B) Zeugen
C) Dreikanter D) Demoiselle
 
Answer & Explanation Answer: A) Wind gap

Explanation:

Demoiselles

These are rock pillars which stand as resistant rocks above soft rocks as a result of differential erosion of hard and soft rocks.

Zeugen

A table-shaped area of rock found in arid and semi-arid areas formed when more resistant rock is reduced at a slower rate than softer rocks around it.

A Dreikanter

It is a type of ventifact that typically forms in desert or periglacial environments due to the abrasive action of blowing sand.

A wind gap is a gap through which a waterway once flowed that is now dry as a result of stream capture.

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Q:

Which one of the following statements is not correct?

A) Position of the sun, Earth and Moon in a straight line of 180oangle is known as syzygy. B) Syzygy conjunction causes solar eclipse.
C) Syzygy opposition causes lunar eclipse. D) Syzygy conjunction occurs at the time of perihelion only.
 
Answer & Explanation Answer: D) Syzygy conjunction occurs at the time of perihelion only.

Explanation:

In astronomy, a syzygy is a straight-line configuration of three or more celestial bodies in a gravitational system.Solar and lunar eclipses occur at times of syzygy, as do transits and occultations.

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0 5
Q:

Which of the following statements concerning atmosphere of the Earth are correct?

1. In stratosphere, temperature increases with altitude.

2. In mesosphere, temperature decreases with altitude.

3. The lowest temperature of the atmosphere is recorded in the upper part of mesosphere.

4. Tropopause is an isothermal zone.

Select the correct answer using the code given below.

A) 1 and 2 only B) 1, 2 and 3 only
C) 3 and 4 only D) 1, 2, 3 and 4
 
Answer & Explanation Answer: D) 1, 2, 3 and 4

Explanation:

In troposphere and mesosphere, temperature declines with increasing altitude. In stratosphere and thermosphere, temperature increases with increasing altitude.The coldest temperatures in Earth’s atmosphere occur at the top of mesosphere, the Mesopause, especially in the summer near the pole.Transitional layers of atmosphere include tropopause, stratopause, and mesopause. These layers are relatively thin and are located between major layers of atmosphere. These have contrasting thermal properties. Hence, in these layers there is no change in temperature with change in altitude.

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0 3
Q:

The elemental composition of an adult human body by mass is

A) C > O > H > N B) O >C >H > O
C) N > C > O > H D) None
 
Answer & Explanation Answer: B) O >C >H > O

Explanation:
O= 65%
C= 18%
H= 9.5%
N= 3.2%
Ca= 1.5%
Ph=1.2%
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0 4
Q:

‘Altitude sickness’ is caused at high altitude due to

A) high partial pressure of oxygen B) low partial pressure of oxygen
C) low level of haemoglobin D) high partial pressure of carbon dioxide
 
Answer & Explanation Answer: B) low partial pressure of oxygen

Explanation:

Altitude sickness, the mildest form being acute mountain sickness (AMS), is the negative health effect of high altitude, caused by rapid exposure to low amounts of oxygen at high elevation.

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0 4
Q:

With reference to earthquakes, which of the following statements are correct?

A. Earthquakes largely occur along the converging plate boundaries.

B. Point of origin of earthquake in lithosphere is known as focus/hypocenter.

C. Intensity of earthquake decreases with distance from the epicenter.

D. Epicentre of earthquake always remains over continents only.

Select the correct answer using the code given below.

A) 1 and 2 only B) 1, 2 and 3
C) 2 and 3 only D) 1 and 4
 
Answer & Explanation Answer: B) 1, 2 and 3

Explanation:

Epicentre of Earthquakes can be over both oceanic and continental surface. Epicentres above oceanic surface are cause of tsunamisof large intensity. Anearthquake's hypocentreis the position where the strain energy stored in the rockis first released, marking thepointwhere the fault begins to rupture.

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0 2
Q:

Excessive use of which ofthe following fertilizers may be responsible for the presence of a toxic substance in groundwater?

A) Nitrogen B) Phosphate only
C) Potassium only D) Phosphate and potassium
 
Answer & Explanation Answer: A) Nitrogen

Explanation:

Excessive use of nitrate including manure may be responsible forthe presence of toxic substance in groundwater. Phosphate can also enter the groundwater via excessive use of fertilizers. High application rates of nitrogen containing fertilizers combined with the high-water solubility of nitrate, leads to increased runoff into surface water as well as leaching into groundwater, thereby causing groundwater pollution.

Only a fraction of the nitrogen-based fertilizers, is converted to produce and other plant matter. Nitrate pollution in groundwater comes from pit latrines, it can cause blue baby syndrome.

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