Questions

Q:

Which of the following is a property of sodium hydroxide?

A) It is insoluble in ether and other Non-polar solvents B) It is slowly soluble in water
C) It has an odor of rotten egg smell D) All the above
 
Answer & Explanation Answer: A) It is insoluble in ether and other Non-polar solvents

Explanation:

Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations Na+ and hydroxide anions OH−.

Properties:

1. It is highly soluble in water, and readily absorbs moisture and carbon dioxide from the air.

2. NaOH is insoluble in ether and other non-polar solvents.

3. It is an odorless compound.

 

Uses:

Sodium hydroxide is used in many industries: in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents, and as a drain cleaner.

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Q:

Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it.


Dyslexia is a perceptual disorder often occurring in persons of normal, or even above average intelligence. The reader is unable to perceive correctly what is on a page. Letters and numbers often appear reversed: "b" seems to be "d","quite" is "quiet" and "from" is "form". The reader tends to leave out letters or words or insert words or letters that are not there. Vowel and consonant sounds may be confused. Many dyslexics are left­handed or able to write with either hand. They often confuse left and right. Learning to speak may also be delayed beyond infancy. The condition seems to be inherited. It may persist into adulthood. However, with early recognition and specialized approaches to teaching reading, most dyslexics can learn to read.

Some researchers believe that latent dyslexia may be aggravated by the way reading is taught. The modern whole­word, or look­and­say, method seems to be more of a hindrance to learning for dyslexics than it is for ordinary pupils. The phonetic method of teaching students to learn letters and sound them out appears to achieve better reading results. The problem of words that cannot be sounded out ­ such as rough, laugh or through ­ is not solved by phonetics. These words must simply be memorized. However, for children with dyslexia the problem can be compounded by the failure of parents or teachers to recognize the condition. This can easily lead to emotional problems for dyslexic children, who cannot understand their failure to keep up with their classmates.


The problem of perception can be compounded by the failure of parents and teachers to

A) provide treatment B) recognize the condition
C) correct the child at infancy D) understand the child
 
Answer & Explanation Answer: B) recognize the condition

Explanation:
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Q:

A kilowatt-hour is unit of

A) Power B) Electric charge
C) Energy D) Electric current
 
Answer & Explanation Answer: C) Energy

Explanation:

The kilowatt hour (kW⋅h) is a composite unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour.

One watt is equal to 1 J/s. One kilowatt hour is 3.6 megajoules.

 

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Q:

Condition of decreased oxygen in the blood

A) Hematemesis B) Hypercapnia
C) Hemoptysis D) Hypoxemia
 
Answer & Explanation Answer: D) Hypoxemia

Explanation:

Oxygen deficiency or decreased oxygen levels in the blood is a condition known as Hypoxemia.

 

Hypercapnia means High carbon dioxide levels in the blood.

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Q:

What allows a cell to respond to a hormone?

A) hormone response element B) presence of hormone receptor
C) Adrenocorticotropic D) None of the above
 
Answer & Explanation Answer: B) presence of hormone receptor

Explanation:
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Q:

Which country’s President has been elected as the chairman of the African Union (AU)?

A) Egypt B) Ethiopia
C) South Africa D) Israel
 
Answer & Explanation Answer: A) Egypt

Explanation:
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Q:

The only bird which can fly backward is

A) Parrot B) Albatross
C) Penguin D) Humming
 
Answer & Explanation Answer: D) Humming

Explanation:

Humming bird is the smallest bird and the only bird which can fly in backwards in the world.

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Q:

Which is characterized by an absence of jaws?

A) Trout B) Sea horse
C) Lamprey D) All of the above
 
Answer & Explanation Answer: C) Lamprey

Explanation:

which_is_characterized_by_an_absence_of_jaws1546668793.jpg image

The Lamprey fish is characterized by an absence of jaws.

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