Questions

Q:

The wavelike properties of electrons are useful in

A) Magnifying objects B) Lasers
C) Weather reports D) All of the above
 
Answer & Explanation Answer: A) Magnifying objects

Explanation:

The photoelectric effect pointed to the particle properties of light, which had been considered to be a wave phenomenon. Particles like electron and protons have both particle like and wave like behavior. Thus, according to de Broglie, all the material particles in motion possess wave characteristics. Although the dual nature of matter is applicable to all material objects but it is significant for microscopic bodies only.

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Q:

Which determines the frequency of a sound wave?

A) Amplitude B) Speed
C) Source D) Medium
 
Answer & Explanation Answer: A) Amplitude

Explanation:

The frequency of a sound wave is determined by the amplitude of the wave. As amplitude of the wave is high the frequency of the wave will also be high.

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Q:

What is the Busiest Metro Network in the world?

Answer

The Moscow Metro in Russia carries 8-9 million passengers each day. By comparison, the New york City Subway, USA carries 4.5 million people each day and the London underground , UK, carries just over 3 million.

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Q:

Which of the following is not an intrusive igneous body?

A) Stock B) Dike
C) Stope D) Batholith
 
Answer & Explanation Answer: C) Stope

Explanation:

These are called intrusive igneous rocks because the magma has intruded into pre-exiting rock layers. Types of intrusive igneous rocks are granite and basalt .

A batholith is the largest of the intrusive bodies.

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Q:

Who conquered Sind in 712 AD?

A) Arabs B) French
C) Greeks D) Mongols
 
Answer & Explanation Answer: A) Arabs

Explanation:

By 712 AD, Arabs conquered Sindh.

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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.


Dyslexia, often occurring in persons of normal, or even above average intelligence, is a __________

A) Conceptual disorder B) Pathological disease
C) Perceptive disorder D) Perceptual disorder
 
Answer & Explanation Answer: D) Perceptual disorder

Explanation:
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Q:

In human body, the cell growth and differentiation are highly controlled and regulated, but in cancer cells

A) there is breakdown of these regulatory mechanisms leading to formation of benign and malignant tumors B) controlled cell divisionand over-production of genetic material occur  
C) RNA is mutated and produced in less amount D) DNA is mutated and produced in less amount
 
Answer & Explanation Answer: A) there is breakdown of these regulatory mechanisms leading to formation of benign and malignant tumors

Explanation:

In cancer cells, there is breakdown of these regulatory mechanisms. Normal cells show a property called contact inhibition by virtue of which contact with other cells inhibits their uncontrolled growth. Cancer cells appears to have lost this property. As a result of this, cancerous cells just continue to divide giving rise to masses of cells called tumors. Tumors are of two types: benign and malignant.

 

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Q:

Which of the following is a feature of ghrelin?

A) It stimulates appetite and energy storage B) It is released in high amounts from adipocytes during periods of excess energy intake
C) The blood level in the fasting state correlates directly with body weight D) It is a metabolic antagonist of leptin
 
Answer & Explanation Answer: A) It stimulates appetite and energy storage

Explanation:
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