Questions

Q:

Which of the following atoms has the largest radius?

A) Br B) K
C) Na D) Cl
 
Answer & Explanation Answer: B) K

Explanation:

For neutral atoms, the periodic trends in atomic size can be described like this

Atomic size decreases when going from left to right across a period,
Atomic size increases when going from top to bottom down a group.

 

Let's use these trends to try and figure out which atom would have the largest radius.

If you look at elements that are located in the same group, potassium will have a larger atomic radius when compared with sodium. Likewise, bromine will have a larger atomic radius when compared with chlorine.

Now focus on potassium and bromine. Since potassium is located at the start of period 3, and bromine at the end of the same period, potassium will have a larger atomic radius than bromine, and thus the largest atomic radius of the four given atoms.

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Q:

The system unit of a personal computer typically contains all except

A) Modem B) Serial interface
C) Microprocessor D) Disk controller
 
Answer & Explanation Answer: A) Modem

Explanation:

The system unit of a personal computer typically contains microprocessor, disk controller and serial interface but it does not contain modem.

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Q:

A sheet or web supported by a metal frame is

A) Trampoline B) Gasoline
C) Colin D) None of the above
 
Answer & Explanation Answer: A) Trampoline

Explanation:

A trampoline is a sheet or web supported by springs in a metal frame and is used as spring board.

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Q:

Demography is the scientific study of

A) Growth of population B) The well being of populations
C) Birth and death of population D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Demography is the scientific study of Birth and death, The well being and the Growth of population. In brief, it is the study of human populations based on their size, composition and distribution across space – and the process through which populations change.

Demography_is_the_scientific_study_of1554269267.jpg image

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Q:

From where do most producers get energy?

A) plants B) sun
C) water D) All of the above
 
Answer & Explanation Answer: B) sun

Explanation:

Most producers use sun light for making their energy in the process of photosynthesis. The energy they prepared is sugar and glucose. 

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Q:

Which energy source generates radioactive waste?

A) Nuclear power B) Thermal power
C) Hydel power D) All of the above
 
Answer & Explanation Answer: A) Nuclear power

Explanation:

which_energy_source_generates_radioactive_waste1543400097.jpg image

Nuclear power energy source generates radioactive waste.

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Q:

The preamble to the constitution does not specify providing for

A) economic equity B) domestic tranquility
C) common defense D) justice
 
Answer & Explanation Answer: A) economic equity

Explanation:

The preamble to the constitution does not specify providing for economic equity.

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Q:

Limbs of frog, lizard, bird and human are example of ______ organs.

A) Homogenous B) Heterogeneous
C) Analogous D) Homologous
 
Answer & Explanation Answer: D) Homologous

Explanation:
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