Sunday, 25 September 2016

PHYSICS DRILL III




   Speed, Velocity, and Acceleration








1.         A body travels with a uniform speed of 80km/h. how long           will it take the body to cover a distance of 16km? (a) 5mins         (b) 12mins (c) 21mins (d) 33mins


2.         A velocity of 144km/h is equal to (a) 40.0m/s (b) 41.6m/s             (c) 86.4m/s  (d) 14.4m/s


3.        A car travelling at 20m/s is brought to rest with a constant            deceleration of 10m/s2. Calculate the distance travelled (a)           10m (b) 20m (c) 400m (d) 450m


4.       A particle started from rest and accelerated uniformly at              12m/s2. What is its velocity after half a minute? (a) 6km/h (b)      360m/h (c)1080km/h (d) 1,296km/h


5.      A train has an initial velocity of 44m/s and an acceleration of      -4m/s2. Its velocity after 10seconds is? (a) 2m/s (b) 4m/s (c)          8m/s (d) 12m/s


6.     A jet fighter released a missile at a point 720m above ground     level. How long will it take the missile to fall to ground level?      (take g=10m/s2). (a) 6s (b) 12s (c) 36s (d0 72s


7.     A vehicle moving with a speed 18km/h accelerated uniformly      at 1m/s2 for 20seconds. The distance covered within this time      is? (a) 38m (b) 300m (c) 305m (d) 318m


8.       A body is projected vertically upwards with a velocity of 40m/s. what is the maximum height the body will attain and how long will it take to reach this height? (g=10m/s2) (a) 80m, 4s (b) 40m, 4s (c) 80m, 2s (d) 20m, 2s


9.        A palm fruit drops to the ground from the top of a tree 45m tall. How long does it take to reach the ground? (g=10m/s2) (a) 9s (b) 45s (c) 6s (d) 3s



10.     A body has motion with uniform velocity if it (a) experiences equal changes in velocity in equal time intervals (b) experiences uniform acceleration (c) experiences equal changes in displacement in equal time intervals (d) experiences equal changes in acceleration in equal time intervals

CHEMISTRY DRILL III

                  PARTICULATE NATURE  OF MATTER 2




1.            The number of atoms in one mole of a substance is equal to?   (a) The Atomic number   (b) The Avogadro number
(c) The Gas constant    (d) The number of neutrons    (e) The number of electrons
2.       In an experiment, 5.00g of a metal gave 10.59g of its chloride. In another experiment, 1.50g of the same metal combined with 1.68g chlorine. The above data illustrates:  (a) Law of Conservation of mass  (b) The Law of Definite proportion   (c) The Law of Multiple proportion   (d) Gay Lussac’s law   (e) Avogadro’s law


3.        The mass of an atom is determined by:  (a) Its ionization potential   (b) Its electrochemical potential   (c) The number of protons and electrons   (d) The number of neutrons and protons    (e) The number of neutrons and electrons

4.       R U S T Y Which of the following statements is NOT true of the elements R, U, S, T, and Y?

(a) R is an isotope of hydrogen   (b) U and Y are isotopes   (c) R, U, S, and T are metals   (d) T is a noble gas   (e) S will react with oxygen to form SO
5.          An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. The empirical formula of the compound is? (H = 1, C = 12, O = 16).   (a) C8H22O3   (b) C6H10O3     (c) C12H12O    (d) C6H12O   (e) C8H6O
6.        0.499g of CuSO4 x H2O when heated to constant weight gave a residue 0.346g. The value of x is? (Cu = 63.5, S = 32.0, O = 16, H =1)   (a) 0.5   (b) 2.0   (c) 3.0   (d) 4.0   (e) 5.0
7.       The number of atoms of chlorine present in 5.85g of NaCl is [Na = 23, Cl =35.5 Avogadro’s number = 6.02 x 1023]v (a) 6.02 x 1022   (b) 5.85 x 1023   (c) 6.02 x 1023    (d) 5.85 x 1024
8.         An isotope has an atomic number of 17 and a mass number 36. Which of the following gives the correct number of neutrons and protons in atom of the isotope?

            Neutrons                               Protons
(a)                  53                                            17
(b)                  17                                            36
(c)                  19                                            17
(d)                  36                                            17

9.       The atomic numbers of two elements X and Y are 12 and 9 respectively. The bond in the compound formed between the atoms of these two elements is?   (a) Ionic   (b) Covalent   (c) Neutral    (d) Co-ordinate
10.      A metallic ion X2+ with an inert gas structure contains 18 electrons. How many protons are there in this ion?

(a) 20   (b) 18   (c) 16   (d) 2

Hypertension: Are You at Risk?





       Forget about all the biological cum medical jargons you have heard concerning the heart. the heart is simply a pump. The duty of the heart is to make sure blood is pumped (pushed) to all and every part of your body where it is needed.


Now every pump has a pressure (roughly speaking,how far the pump can push a liquid), and the heart being a pump has pressures which we call:



  • Systolic Pressure: this is the pressure with which the blood 'pushes' blood into the body. For a healthy person this should be 120mmHg.



  • Diastolic Pressure: This is the pressure with which blood rushes into the heart. For a normal human being this should be 80mmHg 

So, next time you are around medical professionals and you hear: 120/80 it could either mean the score of a basketball match or they are referring to the pressures (systolic/diastolic) of a normal human heart. I would bet it is the latter.

     We say someone is hypertensive (or has High blood Pressure) if the systolic pressure is higher than 120mmHg (usually 190mmHg and above) and the diastolic pressure is higher than 80mmHg.


                                  Why Should my Blood Pressure Increase?


Hypertension is common among the aged.



Well aside economic recession, several factors can cause hypertension, the major culprits are:

Age: 

It is no coincidence that hypertension cases are most common amongst the aged (usually 60 years and above). As we grow older our arteries (the pipes that carry blood away from our heart) become stiffer, and so our heart has to push harder. more push = more pressure.



Obesity:

Generally the heart of fat people has to do more work to meet up. This increases the pressure at which the heart operates. so if you are on the 'heavy' side, loose weight, fast!


Bad Lifestyle:

Over indulgence in alcohol and tobacco, and lack of proper and moderate exercise, and little or no sleep have all been medically proven to cause hypertension.
Bad Nutrition

 A constant diet that is high in salt, can lead to hypertension. Also, drinking too much coffee can lead to hypertension.


 How Do I Know If I Have Hypertension?

Hypertension is a very dangerous predicament because it has no well defined symptoms. in fact most medical professionals refer to it as Symptom-less. This is why hypertension is one of the leading causes of sudden death worldwide.

A simple electronic sphygmanometer for measuring bllod pressure
      So always make sure you go for regular blood pressure check, or better still get the equipment like the simple one shown above and learn how to do it yourself.



   How Do i Minimize My Risk of  Hypertension

To minimize your risk of hypertension, medical professionals advice that you should:

  • Take regular exercise serious: care should be taken not to overdo  it, as this can temporarily increase blood pressure .

  • Go for regular blood pressure checkup: Hypertension is a silent killer, in most cases it gives no symptoms at all.

  • Cut down on salt: Medically. salt is a well known hypertension trigger. Aged people (60 years and above) should cut down salt intake in there diets, to reduce there risk of becoming hypertensive.

  • Proper Diet: Some foods have been proven to fight hypertension, these includes:
  1. Snails
  2. White Beans
  3. Bananas
  4. Sweet Potatoes
  5. Avocado Pea  e.t.c.


So, it is never too early to start the fight against one of the most silent killer ever known.



Did you enjoy this article? please let me know in the comment box below,and don't forget to share.

Have a powerful week!















Friday, 23 September 2016

10 Amazing Chemistry Facts for You.







This week we have decided to peddle down by bringing to you some interesting chemistry facts we know you probably haven't heard of. Please  don't forget to test your friends and completely amaze them with this facts.

Now do you know that:

  • The popular element calcium ( the element that your skeleton is made of ),  is gotten from the Latin word 'CALCIS ' which means LIME.

  • Helium is the second most abundant element in the entire universe, and that inhaling helium can change the sound of your voice?
 
Helium: One of the lightest substances known to man. in fact helium is so light it defies gravity.

  • The element Carbon has forms over ten million compounds. One of this compounds: Diamond is the Hardest known substance and Graphite one of the softest known compounds.  Carbon comes from the Latin word 'Carbo' which means charcoal.


  • Nitrogen is also called 'burnt air'. This is because air that is burnt no longer contains oxgen (since it supports burning). This leaves Nitrogen as the major component, as other components have a negligible percent composition.

  • Pure Potassium is so soft, even though it is a Metal, that you can cut it with a knife. 
  • A mixture of  hydrochloric acid and nitric acid gives us an acidic mixture we call 'Aqua Regia'  which is Latin for 'Royal Water' it is called royal water because it can melt precious metals like gold, and platinum.

  • A mixture of Tetraoxosulphate (vi) acid, and Hydrogen Peroxide produces a mixture called Piranhas solution or Caros Acid. It can dissolve any organic tissue. 
  •  If you pour a tablespoonful of salt into a full glass of water, after a while the volume of water will go down, try it and be amazed.

There is no letter J in the Periodic Table
  • That there is no element in the periodic table that contains the letter J.

  • A bees sting is acidic





We Promise to bring more WoW moments your way. The Revealed wishes you a smooth weekend, and don't forget to share and comment.




Sunday, 18 September 2016

The Wonders of Moringa



                MORINGA

       Moringa is a plant that is grown in the tropics. It’s also known as: ben nut tree, horseradish tree, or the clarifier tree. In most African language, it’s often called “NEBEDAYE’ which means “NEVER DIE”. There is no part of the moringa plant that is useless, its leaves, fruit, bark, flower, fruit, seed, and root, are all medicinal.


     The moringa plant is used to aid the treatment of most ailment such as: kidney stone, headaches, thyroid disorder, and cases of fluid retention in the body. It’s also used to treat infections of various kinds, be it bacterial, fungal, or parasitic infections.


       More so, the moringa plan is used to increase sex drive, boost the immune system, and most people use it as nutritional supplement. It’s an important food source, it’s easy to cultivate, cheap, and when dried, there are no nutrient lost, since it retains its vitamins and minerals. It’s equally rich in antioxidants and bioactive plant compounds

.
                              EXAMPLES OF THE ANTIOXIDANT ARE;

·        Quercetin                ( which lowers the blood pressure of the body)

·        Chlorogenic acid     (which helps to moderate blood sugar after meal)


                                SOME SPECIES OF MORINGA

·        Moringa rivae            (found in Ethiopia ,and Kenya)
)
·        Moringa borziana      (found in Somalia )

·        Moringa peregrine    (horn of Africa)

·        Moringa ovalifolia     (found in Namibia, Angola)


                        Some quick Home Remedies with Moringa:

1.     Moringa soup: 

The leaves of the moringa plant can be ground and used for soup making. This has been suspected to alleviate asthma symptoms. The leaves of the moringa plant contains a chemical that relaxes the bronchioles.



Ground Moringa Leaf



2.     Chewing Stick:

 The stem of the moringa plant is very rich in zinc. Zinc helps in the regulation of the insulin produced in the body. This is wonderfull news for sufferers of diabetes and for those that just want to keep there blood sugar level in check.

3.     Moringa Seed and Honey:

 The moringa seed is rich in vitamin A, and can be consumed with honey to foster a better eyesight. The seed is mixed abundantly with honey to form a syrup, that can and should be taken at regular intervals.

 
Pure Honey.






So, hope you enjoyed the article? Don’t forget to share and comment.
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Tuesday, 13 September 2016

CHEMISTRY DRILL 2


      We normally define matter as anything that has weight and occupies space. in other words matter is simply everything we can see (this definition is okay for this level). In this drill we test  a basic understanding of the intricacies of matter, the constituents of different types of matter and how they interact to produce the various properties we see.


                                                                                                                                                                                                              
   1.          The nucleus of an atom contains (a) Protons only (b) Neutrons only (c) Protons and electrons        (d)  Neutrons and electrons (e) Protons and neutrons

  2.      Five atoms, T, W, X, Y, Z, consist of the following particles:
                                         T             W            X             Y             Z
          Proton                     13            16            17            19           20
         Electron                    13            16            17            19           20
        Neutron                      14            16            35            20           20

          Which of the five atoms can be described by the following properties: Relative atomic mass is            greater than 30 but less than 40, it has odd atomic number and forms a unipositive ion in                    solution.
           (a) T (b) W (c) X (d) Y (e) Z

3.    An element X forms the following compounds with Chlorine: XCl4, XCl3, XCl2. This illustrates the (a) Law of multiple proportions (b) Law of chemical proportions (c) Law of simple proportions (d) Law of conservation of mass (e) Law of definite proportions.

4.    Which of the following statements is true when the potassium atom forms its ion? (a) It gains one electron and become neutral (b) Its atomic number decreases (c) It achieves electronic configuration of argon (d) It loses one proton (e) It loses one neutron.

5.   The empirical formula of an oxide of nitrogen containing 30.4% of nitrogen is (N=14.0, O=16.0). (a) N2O2 (b) NO (c) NO2 (d) N2O (e) N2O3

6.     A sample of an oxide of mercury weighed 1.00g. When this was heated, oxygen was given off, and 1.00g of mercury metal only was left. What is the formula of the oxide? (Hg = 200, O = 16) (a) Hg2O (b) HgO2 (c) HgO4 (d) HgO (e) None of the above

7.     On heating under suitable conditions, 1 litre of a monoatomic gas X combines with 1½ litres of oxygen to form an oxide. What is the formula of the oxide? (a) XO3 (b) X2O3 (c) X3O2 (d) XO2 (e) None of the above

8.     An element X has 127 neutrons and 82 electrons. Its atomic number is? (a) 209 (b) 105 (c) 45 (d) 82 (e) 127

9.    The mass number of an atom is (a) The number of electrons in the atom (b) The number of protons in the nucleus of the atom (c) The number of neutrons in the nucleus of the atom (d) The sum of numbers of electrons and protons in the atom (e) The sum of numbers of protons and neutrons in the nucleus of the atom

10.   In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?

    (a)     One atom of H2 reacts with two atoms of O2 to give one molecule of H2O   

    (b)    Two atoms of H2 react with two atoms of O2 to give two molecules of H2O

   (c)    One molecule of O2 reacts with one molecule of H2 to give 2 molecules of H2O 

    (d)    One molecule of H2 reacts with 2 molecules of O2 to give 3 molecules of H2O

  (e)    One molecule of O2 reacts with 2 molecules of H2 to give 2 molecules of H2O



Monday, 12 September 2016

BIOLOGY DRILLS 2







Our Biology drill this week focuses on organization of life. Please read our instructions before participating.  You are very much advised to go through your revealed pack before attempting this questions.


1.        Which of the following organisms is single celled and free living? (a) Volvox (b) Spirogyra (c) Rhizopus (d) Chlamydomonas
2.                 Which of the following statements is true of unicellular organisms? They possess: (a) Large area to volume ratio (b) All cell organelles (c) Large volume ratio to surface area (d) Freely permeable membranes
3.                 Which of the following arrangements gives the correct order to all organization? I. System II. Tissue. III. Cells IV. Organs (a) I, IV, II and III (b) I, II, IV and III (c) III, IV, II and I (d) III, II, IV and I
4.      Which of the following levels of organization in living things is in the correct sequence, starting from the complex to the simplest? (a) Tissue – Cell – Organ – System (b) System – Organ – Tissue – Cell (c) Cell – Tissue – System – Organ (d) Cell – Tissue – Organ – System
5.                 At what level of organization is Amoeba? (a) Tissue (b) Organ (c) Cell (d) Stem
6.            The epidermis of the mammalian skin is an example of tissue because the cells: (a) Prevent light from passing through them (b) Have a similar structure and function (c) Prevents excessive loss of water (d) Are impregnated with keratin
7.            Which of the following statements is correct about organs? (a) They are composed of specialized cells (b) They perform a certain overall function (c) They are not found in plants (d) Unicellular animals have few organs
8.             Which of these organs can be considered vestigial in humans but functional in other mammals? (a) Liver (b) Appendix (c) Rectum (d) Stomach
9.             Which of these organisms has a body structure at the tissue level of organization? (a) Amoeba (b) Paramecium (c) Hydra (d) Euglena
10.     What structure is formed from the aggregate of similar cells? (a) Organism (b) System (c) Organ (d) Tissue


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