Questions

Q:

Atomic mass of first 30 elements?

Answer

Here I give you the first 30 Atomic elements names and their Atomic masses.


 


Atomic number      Element        Atomic mass
                             


        1                 Hydrogen           1


        2                  Helium              4


        3                 Lithium              6.94


        4                Beryllium            9.01


        5                  Boron               10.81


        6                Carbon               12.01


        7                Nitrogen             14.01


        8                Oxygen              15.99


        9                Fluorine              19.00


       10                Neon                 20.18


       11               Sodium               22.99


       12             Magnesium           25.31


       13             Aluminium            26.98


       14               Silicon                28.09


       15             Phosphorus           30.97


       16               Sulphur               32.07


       17               Chlorine              35.45


       18                Argon                 39.95


       19             Potassium              39.10


       20              Calcium                40.08


       21             Scandium              44.96


       22             Titanium               47.87


       23            Vanadium              50.94


       24             Chromium            24. 52


       25            Manganese            54.94


       26                Iron                  55.85


       27              Cobalt                 58.93


       28               Nickel                 58.69


       29              Copper                 63.55


       30                Zinc                   65.41

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2 4273
Q:

Atomic weight of an element is given by

A) sum of neutrons and electrons B) sum of neutrons and protons
C) only neutrons D) only protons
 
Answer & Explanation Answer: A) sum of neutrons and electrons

Explanation:

Atomic weight=number of neutrons+number of protons

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7 4271
Q:

Now my value becomes ?

value1499404917.jpg image

A) 5 B) 10
C) 15 D) 12
 
Answer & Explanation Answer: B) 10

Explanation:

In the first figure, number of triangles are 5.

In the second, the figure becomes double then the number of triangles also doubles.

i.e, 10. 

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15 4271
Q:

Which object, initially called the 'Whirlwind', was invented by Ives McGaffey in 1869 ?

A) Washing machine B) Electric mixer
C) Vacuum cleaner D) Blender
 
Answer & Explanation Answer: C) Vacuum cleaner

Explanation:
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Filed Under: Inventions

7 4271
Q:

Gasoline is useful in cars because it has

A) chemical potential energy B) electrical potential energy
C) gravitational potential energy D) kinetic energy
 
Answer & Explanation Answer: A) chemical potential energy

Explanation:

Gasoline is a colorless petroleum-derived flammable liquid that is used primarily as a fuel in spark-ignited internal combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives. It is also called as Petrol. It has chemical potential energy, in combustion it is turned into light, sound, heat and kinetic energy.

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Filed Under: Physics
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2 4271
Q:

Number of moles of CO2 present in 24 grams of carbon is

A) 0.5 B) 1
C) 2 D) 0.25
 
Answer & Explanation Answer: C) 2

Explanation:

1 mole of CO2 contain 12gms of carbon and 44 gms of CO2

therefore  24 gms of carbon is present in 88 gms of CO2 or 2 moles of CO2

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Filed Under: Chemistry

7 4269
Q:

Who is the inventor of railway engine?

A) George Stephenson B) W.H.F Talbot
C) Richard Trevithik D) Eli Whitney
 
Answer & Explanation Answer: C) Richard Trevithik

Explanation:
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1 4268
Q:

What is the official language of African Export and import Bank

A) Egypt B) Senegal
C) Dauber D) None of these
 
Answer & Explanation Answer: A) Egypt

Explanation:
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Filed Under: World Organisations

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