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Q:

When a piece of pure silicon is doped with aluminium, then

A) the conductivity of the doped silicon piece will remain the same B) the doped silicon piece will become n-type
C) the doped silicon piece will become p-type D) the resistivity of the doped silicon piece will increase
 
Answer & Explanation Answer: C) the doped silicon piece will become p-type

Explanation:

p type of semiconductor is obtained when Silicon is doped with a trivalent impurity like Aluminium. Aluminium is a p-type dopant, which means that when a semiconductor i.e. silicon is doped with aluminium, it creates a hole (positively charged carrier) by accepting an electron from the silicon atom. Electrical conductivity of semiconductors increasesand resistivity remains the same

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Filed Under: Physics
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Q:

The soaps used in shaving cream are 

A) Calcium soaps B) lead soaps
C) soft soaps D) hard soaps
 
Answer & Explanation Answer: C) soft soaps

Explanation:
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Filed Under: Chemistry

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Q:

Reduction of oxygen which forms water occurs during

A) Respiration B) Photosynthesis
C) Both A & B D) Neither photosynthesis nor respiration
 
Answer & Explanation Answer: A) Respiration

Explanation:
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Filed Under: Chemistry
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Q:

In which of the following activities silicon carbide is used

A) Disinfecting water of ponds B) Making casts for statues
C) Making cement and glass D) Cutting very hard substances
 
Answer & Explanation Answer: D) Cutting very hard substances

Explanation:

In_which_of_the_following_activities_silicon_carbide_is_used1553082795.jpg image

Silicon carbide is used in Cutting very hard substances.

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Filed Under: Chemistry
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Q:

Molar mass of HNO3?

A) 63 g/mol B) 53 g/mol
C) 48 g/mol D) 52 g/mol
 
Answer & Explanation Answer: A) 63 g/mol

Explanation:

Calculation of molar mass of HNO3:

Atomic masses of H, N, O are 1, 14, 16 respectively

Now the molar mass of HNO3 is

HNO3 = 1X1 + 1X14 + 3X16

= 1 + 14 + 48

= 63 g/mol or amu.

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Filed Under: Chemistry
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Q:

As per the Census of 2001, the least urbanised State of India is

A) Arunachal Pradesh B) Assam
C) Himachal Pradesh D) Uttar Pradesh
 
Answer & Explanation Answer: C) Himachal Pradesh

Explanation:
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Filed Under: Indian Economy

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Q:

Man has _____ pairs of salivary glands

A) 3 B) 4
C) 6 D) 8
 
Answer & Explanation Answer: A) 3

Explanation:

Salivary glands of man are 3 pairs = 6. They are one pair of parotid glands, one pair of sub-maxillary or sub-mandibular glands and one pair of sub-lingual glands.

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Filed Under: Biology

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Q:

East African Valleys, streching from East Africa through Red Sea to Syria is an example of

A) river valley B) rift valley system
C) glaciated valley D) a canyon
 
Answer & Explanation Answer: B) rift valley system

Explanation:

A rift valley is formed either due to upheaval of blocks on either sides of a fracture or due to subsidence of block between them.

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Filed Under: World Geography

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