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Q:

Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it.


Ants have been living on the earth for more than 100 million years and can be found almost anywhere on the planet. It is estimated that there are about 20000 different species of ants. For this reason ants have been called Earth's most successful species. If you watch ants for any length of time you will see that they really do communicate with each other and very effectively too. Ants communicate by touching each other with their antennae. Ants also use chemicals called pheromones to leave scent trails for other ants to follow. Ants build many different types of homes. Many ants build simple little mounds out of dirt or sand. Other ants use small sticks mixed with dirt and sand to make a stronger mound that offers protection from rain. Western Harvester ants make a small mound on top, but then tunnels up to 15 feet straight down to hibernate during winter. Ant mounds consist of many chambers connected by tunnels. Different chambers are used for nurseries, food storage, and resting places for the worker ants. Some ants live in wood like termites. Army ants don't make a home at all but travel in a large groups searching for food. Ants are social insects which means they live in large colonies or groups. Some colonies consist of millions of ants. There are three types of ants in each species, the queen, the sterile female workers and males. The male ants only serve one purpose, to mate with future queen ants and do not live very long. The queen grows to adulthood, mates, and then spends rest of her life laying eggs. A colony may have only one queen, or there may be many queens depending on the species. Ants go through four stages of development: egg, larva, pupa and adult.


Why are ants called the 'Earth's' most successful species?

A) Because they have been on earth for more than a 100 million years B) Because they can be found anywhere on earth
C) Because they have been on earth for more than a 100 million years and because they can be found anywhere on earth D) Because there are 2000 different species of ants on earth
 
Answer & Explanation Answer: C) Because they have been on earth for more than a 100 million years and because they can be found anywhere on earth

Explanation:
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Q:

REM sleep is also known as paradoxical sleep because

A) Measures of the brain activity closely resemble waking consciousness, but the person is incapable of moving. B) The person can have night terrors during this stage but will not remember them in the morning. (E) Th e person's vital signs are very slow, but the person can get up and walk around
C) Measures of the brain activity closely resemble waking consciousness, but the person is in the deepest stage of sleep. D) The person's heart rate is slower than when awake, but the person can sleepwalk or sleep talk.
 
Answer & Explanation Answer: A) Measures of the brain activity closely resemble waking consciousness, but the person is incapable of moving.

Explanation:

REM sleep i.e, Rapid Eye Movement sleep is also known as paradoxical sleep because the measures of the brain activity closely resemble waking consciousness, but the person is incapable of moving as the brain is in fully active mode that time.

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Q:

If the latitude and longitudinal extent of an Indian State/UT is 15o48’00’’N to 14o53’15’’N and 74o20’13’’E to 74o40’33’’E, then which one of the following is that State/UT ?

A) Puducherry B) Chandigarh
C) Goa D) Delhi
 
Answer & Explanation Answer: C) Goa

Explanation:

Delhi: Latitude-28.38 N, Longitude-77.12 E

Chandigarh: Latitude-30.44 N, Longitude-76.47 E

Puducherry: Latitude-11° 54' N, Longitude-79° 48' E

Goa: Latitude-15°29'N. N, Longitude-73°48'E.

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Q:

In a bipolar junction transistor

A) all the three regions (the emitter, the base and the collector) have equal concentrations of impurity B) the emitter has the least concentration of impurity
C) the collector has the least concentration of impurity D) the base has the least concentration of impurity
 
Answer & Explanation Answer: D) the base has the least concentration of impurity

Explanation:

In terms of concentration of impurity (a.k.a impurity doping concentration, often abbreviated to doping concentration), from the highest to the lowest among the three regions of a bipolar junction, emitter, collector, and base are the correct order. The above order is independent of the type of BJT, npn or pnp

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Q:

The  optical  phenomenon  that  is  primarily responsible  for  the  observation  of  rainbow on a rainy day is 

A) diffraction B) interference
C) dispersion D) reflection
 
Answer & Explanation Answer: C) dispersion

Explanation:

A rainbow is a natural spectrum appearing in the sky after a rain shower. It is caused by dispersion of sunlight by tiny water droplets, present in the atmosphere. A rainbow is always formed in a direction opposite to that of the Sun. The water droplets act like small prisms. They refract and disperse the incident sunlight, then reflect it internally, and finally refract it again when it comes out of the raindrops.

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Q:

Weight of a person at a height of 2R from the centre of the earth, where R is the radius of the earth _______.

A) remains same B) becomes half
C) becomes twice D) becomes one­-fourth
 
Answer & Explanation Answer: D) becomes one­-fourth

Explanation:
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Q:

Aryabhatta and Kalidasa were in the court of which Gupta Emperor?

A) Kumara Gupta I B) Chandra Gupta II
C) Samudra Gupta D) Skanda Gupta
 
Answer & Explanation Answer: C) Samudra Gupta

Explanation:
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Q:

Who has become first Indian player in ODI history to score three consecutive 100s as captain?

A) Virat Kohli B) Rohit Sharma
C) MS Dhoni D) Shikar Dhawan
 
Answer & Explanation Answer: A) Virat Kohli

Explanation:
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