6
Q:

The hardened material available on earth is

A) Gold B) Diamond
C) Iron D) Platinum

Answer:   B) Diamond



Explanation:
Subject: General Science
Q:

Blood group compatibility for marriage?

Answer

Matching blood group before marriage is important. This is to prevent Rh incompatibility. Rh incompatibility can lead to erythroblastosis fetalis (Hemolytic disease of the newborn-HDN). Fetal RBC gets destroyed & newborn may get severe anaemia, jaundice. This jaundice is more severe than Physiological jaundice ( which is the most common and will usually resolve on its own).


In very severe form, a fetus may die due to heart failure. This is mediated by the antigen-antibodies reaction. Transfer of maternal antibodies across the placenta occurs. This happens when Rh +ve man marries Rh-ve lady.


 


So Rh +ve man should try to avoid marrying Rh-ve lady.


 


Matching blood groups for marriage ::


Boy : A = Girl:A & AB


Boy :  B = Girl:B & AB


Boy : O = Girl:O, A, B & AB


Boy : AB = Girl : AB


Boy : Rh+ve = Girl : Rh+ve


Boy : Rh-ve = Girl : Rh+ve & Rh-ve.


 


Blood groups that do not match for marriage ::



Boy : A = Girl : O & B


Boy : B = Girl : O & A


Boy : AB = Girl : O, A & B


Boy : Rh+ve = Girl : Rh-ve.

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0 43
Q:

Which of these is a starting point for primary succession?

A) a surface exposed by a retreating glacier B) a neglected yard
C) abandoned farmland D) an abandoned city
 
Answer & Explanation Answer: A) a surface exposed by a retreating glacier

Explanation:

Primary succession is the orderly and predictable series of events through which a stable ecosystem forms in a previously uninhabited region. Primary succession occurs in regions characterized by the absence of soil and living organisms.

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1 119
Q:

What is the primary form of fat in the diet?

A) Lipids B) Fattyacids
C) Triglycerides D) All of the above
 
Answer & Explanation Answer: C) Triglycerides

Explanation:

Triglycerides are the primary form of dietary fat found in the body, and may contain a combination of three fatty acids:

saturated fatty acids (SFAs),

polyunsaturated fatty acids (PUFAs), or

monounsaturated fatty acids (MUFAs).

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0 55
Q:

Which of the following is a chemical property?

A) Reactivity B) Solubility
C) Density D) All of the above
 
Answer & Explanation Answer: A) Reactivity

Explanation:

The ability of two or more substances to combine to form other substances is called Reactivity.

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0 71
Q:

Gases in the atmosphere and their percentages?

Answer

The air around us is a mixture of gases, mainly nitrogen and oxygen, but containing much smaller amounts of water and other gases.


Earth's atmosphere is composed of many gases. Their percentages by volume is given by::


 
78% Nitrogen,


21% Oxygen,


0.9% Argon, and


0.03% Carbon dioxide 


And very small percentages of other elements.


 

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0 51
Q:

Plants are photoautotrophs. What does this mean?

Answer

Photoautotrophs are those organisms that can make their own food using sun light with the help of the process of photosynthesis.


Plants can prepare their own food using sunlight. Hence they are Photoautotrophs.

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0 55
Q:

Which process removes carbon dioxide from the atmosphere?

A) Combustion B) Photosynthesis
C) Respiration D) All of the above
 
Answer & Explanation Answer: B) Photosynthesis

Explanation:

Photosynthesis process removes carbon dioxide from the atmosphere. Green plants remove carbon dioxide from the atmosphere by photosynthesis. 

The level of carbon dioxide in the atmosphere is maintained by several processes, including photosynthesis, respiration and combustion. 

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0 79
Q:

The hot holding temperature for potentially hazardous foods must be

A) not less than 60 deg B) less than 60 deg
C) less than 5 deg D) None of the above
 
Answer & Explanation Answer: A) not less than 60 deg

Explanation:

Potentially hazardous foods are foods that might contain food poisoning bacteria and are capable of supporting growth of these bacteria or formation of toxins to levels that are unsafe for consumers, if the foods are not stored at correct temperatures. Toxins are poisonous chemicals produced by some types of bacteria.


The food can be left at room temperature until it reaches 60 deg C because food-poisoning bacteria will not multiply at 60 deg C or above. However, do not leave food cooling at room temperature unless you are sure that the temperature of the food is still at least above 60 C.

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0 92