Questions

Q:

Dry ice is an example of which process

A) Condensation B) Evaporation
C) Sublimation D) Freezing
 
Answer & Explanation Answer: C) Sublimation

Explanation:

Sublimation is a process when a solid changes directly into gas instead changing into liquid first. Dry ice is an example of Sublimation process because it doesn't change into liquid CO2 and directly change into gaseous CO2 when heated.

 

Hence, Dry ice is an example of Sublimation process. 

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Q:

What does the term Jim Crow refer to? 

A) the civil rights movement of the mid-twentieth century B) northern whites who sympathized with African Americans
C) African American politicians during Reconstruction D) the system of racial segregation in the South after Reconstruction
 
Answer & Explanation Answer: D) the system of racial segregation in the South after Reconstruction

Explanation:
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Q:

Select the correct statement about cellular respiration?

A) All the carbon atoms in glucose ultimately incorporated during cellular respiration into carbon dioxide molecule B) All the carbon atoms in glucose ultimately incorporated during cellular respiration into NADH molecule
C) All the carbon atoms in glucose ultimately incorporated during cellular respiration into ATP molecule D) All the carbon atoms in glucose ultimately incorporated during cellular respiration into water molecule
 
Answer & Explanation Answer: A) All the carbon atoms in glucose ultimately incorporated during cellular respiration into carbon dioxide molecule

Explanation:

All the carbon atoms in glucose ultimately incorporated during cellular respiration into carbon dioxide molecules.

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Q:

Foods that allow micro organisms to grow are called Parasites.

A) TRUE B) FALSE
Answer & Explanation Answer: B) FALSE

Explanation:

No, the given statement is False.


Parasites are organisms that feed on other organisms causing harm to them.


Foods that allow micro organisms to grow are called Growth Mediums.

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Q:

A myocardial infarction is a heart attack.

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

True, the given statement that a myocardial infarction is a heart attack.


heart-attack-_myocardial_infarction1532070967.jpg image

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Q:

When a piece of pure silicon is doped with aluminium, then

A) the conductivity of the doped silicon piece will remain the same B) the doped silicon piece will become n-type
C) the doped silicon piece will become p-type D) the resistivity of the doped silicon piece will increase
 
Answer & Explanation Answer: C) the doped silicon piece will become p-type

Explanation:

p type of semiconductor is obtained when Silicon is doped with a trivalent impurity like Aluminium. Aluminium is a p-type dopant, which means that when a semiconductor i.e. silicon is doped with aluminium, it creates a hole (positively charged carrier) by accepting an electron from the silicon atom. Electrical conductivity of semiconductors increasesand resistivity remains the same

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Q:

Water is an excellent solvent because

Answer

Water is capable of dissolving a variety of different substances, which is why it is such a good solvent.

And, water is called the "universal solvent" because it dissolves more substances than any other liquid

It means that wherever water goes, either through the ground or through our bodies, it takes along valuable chemicals, minerals, and nutrients

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Q:

A bottle is full of dettol. One-third of it is taken out and then an equal amount of water is poured into the bottle to fill it. This operation is done four times. Find the final ratio of dettol and water in the bottle.

A) 13 : 55 B) 20 : 74
C) 16 : 65 D) 10 : 48
 
Answer & Explanation Answer: C) 16 : 65

Explanation:
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