Questions

Q:

A passage is given with 5 questions following it. Read the passage carefully and choose the best answer to each question out of the four alternatives.


The quest to find life outside the solar system got a big boost with the discovery of seven Earth-size extra-solar planets, or exoplanets, orbiting a dwarf star about 40 light years away. Unlike earlier discoveries of exoplanets, all seven planets could possibly have liquid water — a key to life as we know it on Earth — with three planets having the greatest chance. This is by far the largest collection of Earth-like planets in the habitable 'Goldilocks' zone of a star — neither too close nor too far from a star, which raises the possibility of liquid water being present on the surface. Only Earth has liquid water in the solar system. Since the dwarf star is much cooler than the Sun, the dimming of light each time a planet passes or transits before the star could be easily recorded from Earth unlike in cases when planets transit a Sun-like bright star. Since the initial discovery of three planets was made using the Chile-based Transiting Planets and Planetesimals Small Telescope, the exoplanet system is called TRAPPIST-1.

 

What is essential to have the possibility of life on a planet?

A) Presence of atmosphere B) Presence of gravity
C) Presence of sunlight D) Presence of liquid water
 
Answer & Explanation Answer: D) Presence of liquid water

Explanation:
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Q:

What is the capital of Denmark?

A) Copenhagen B) Stockholm
C) Vienna D) Oslo
 
Answer & Explanation Answer: A) Copenhagen

Explanation:
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Q:

What is DRAM? In which form does it store data?

Answer

DRAM is not the best, but it’s cheap, does the job, and is available almost everywhere you look. DRAM data resides in a cell made of a capacitor and a transistor. The capacitor tends to lose data unless it’s recharged every couple of milliseconds, and this recharging tends to slow down the performance of DRAM compared to speedier RAM types.

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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:

By definition a clade is

A) monophyletic B) polyphyletic
C) parsimonious D) paraphyletic
 
Answer & Explanation Answer: A) monophyletic

Explanation:

A clade is a group of ancestral species and all its descendants. Hence it is a branch of one same species and so monophyletic.

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Q:

The term just noticeable difference is synonymous with

A) difference threshold B) separation threshold
C) change threshold D) response threshold
 
Answer & Explanation Answer: A) difference threshold

Explanation:

The term just noticeable difference is synonymous with difference threshold and refers
to the detection of change.

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Q:

Activation of the receptors by stimuli is called

A) Adaptation B) Perception
C) Habituation D) Sensation
 
Answer & Explanation Answer: D) Sensation

Explanation:

Sensation is the activation of the receptors by stimuli.

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Q:

Bacteria divide by

A) Binary Fission B) Spirilla
C) RNA D) Fusion
 
Answer & Explanation Answer: A) Binary Fission

Explanation:

Bacteria divided and reproduce by Binary fission. In this process, the bacterium, which is a single cell, divides into two identical daughter cells. Binary fission begins when the DNA of the bacterium divides into two replicates.

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