Questions

Q:

Covalent bonds are formed when electrons are

A) Transfer of electrons B) Sharing of electrons
C) Dividing of electrons D) All of the above
 
Answer & Explanation Answer: B) Sharing of electrons

Explanation:

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.

 

Examples of compounds with covalent bonds ::

HCl, CO2, O2,... 

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Q:

The terminal part of the carpel in a flower, which may be sticky is ______

A) Ovary B) Style
C) Stigma D) Anther
 
Answer & Explanation Answer: C) Stigma

Explanation:
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Q:

Which organ does detoxification and produces chemicals needed for digestion?

A) Salivary glands B) Pancreas
C) Thyroid gland D) Liver
 
Answer & Explanation Answer: D) Liver

Explanation:
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Q:

The Mosque with "shaking minarets" is situated in which Indian city?

A) Kanpur B) Ahmedabad
C) Jaipur D) Ranchi
 
Answer & Explanation Answer: B) Ahmedabad

Explanation:
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Q:

For a certain reaction,DGq = -45 kJ/mol and DHq= -90 kJ/mol at 0°C. What is the minimum temperature at which the reaction will become spontaneous, ifDHq and DSq are independent of temperature?

A) 273 K B) 298 K
C) 546 K D) 596 K
 
Answer & Explanation Answer: C) 546 K

Explanation:

T = 273 °K

Using the formula,

DGq = DHq –TDS

-45 = -90 –273 DS

DS = 0.164

Now since DHq and DSq are independent,T2= DH/DS = 45/0.164 = 273°K

Required Temp = 273 + 273 = 546°K

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Q:

If price of an article decreases from Rs 240 to Rs 220, when quantity demanded increases from 200 units to 210 units. Find point elasticity of demand?

A) 0.6 B) -1.8
C) -0.6 D) 1.8
 
Answer & Explanation Answer: C) -0.6

Explanation:
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Q:

The quality or tone of a musical sound produced by a stringed instrument depends on

A) frequency of vibration B) length of the strings in the instrument
C) Amplitude of vibration D) waveform of the sound
 
Answer & Explanation Answer: D) waveform of the sound

Explanation:
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Q:

Who has appointed as Chairman of Ordnance Factory Board ?

A) Hemanth B) Bhargav
C) Saurabh kumar D) Rami Malek
 
Answer & Explanation Answer: C) Saurabh kumar

Explanation:
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