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:

Infection of salivary glands by a virus leads to

A) tetanus	B) mumps
C) pyorrhoea	D) ulcers

Answer & Explanation Answer: B) mumps

Explanation:

Mumps: This is a swelling caused by inflammation of parotid glands placed in front of our ear region. The Inflammation is caused by a virus.

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Filed Under: Biology

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Q:

'agdrne' correct word is

A) Redgan	B) Dengar
C) Garden	D) Regdan

Answer & Explanation Answer: C) Garden

Explanation:

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Q:

Which of the following equations represents Photosynthesis?

A) 6CO2 + 6H2O -----> C6H12O6 + 6O2	B) C6H12O6 + 6O2 -----> CO2 + 6H2O
C) CO2 + H2O -----> C6H12O6 + 6O2	D) 6O2 + 6H2O -----> C6H12O6 + 6CO2

Answer & Explanation Answer: A) 6CO2 + 6H2O -----> C6H12O6 + 6O2

Explanation:

Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms activities.

Photosynthesis can be represented using a chemical equation.

The overall balanced equation is

$6 {CO}_{2} + 6 H_{2} O \overset{Sunlight}{\to} C_{6} H_{12} O_{6} + 6 O_{2} (S o u r c e o f C a r b o n & O x y g e n) + (S o u r c e o f E l e c t r o n s & H y d r o g e n) + E n e r g y t h a t d r i v e s P h o t o s y n t h e s i s - - - - > S u g a r + G a s p r o d u c e d b y s p l i t t i n g w a t e r .$

Where

CO2 = carbon dioxide

H2O = water

C6H12O6 = glucose

O2 = oxygen.

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Filed Under: Chemistry
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Q:

Which of the following statements about monsoons are correct?

A) Monsoons can cause devastating landslides and floods.	B) Heavy monsoons increase agricultural output.
C) A weak monsoon season can lead to drought and starvation.	D) All of the above

Answer & Explanation Answer: D) All of the above

Explanation:

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Filed Under: Indian Geography
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Q:

The largest herbarium of India is located at

A) Kolkata	B) Lucknow
C) Mumbai	D) Coimbatore

Answer & Explanation Answer: A) Kolkata

Explanation:

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Q:

Bone strength in later life depends on

A) the formation of dense bones during youth	B) the increased calcium absorption in the elderly
C) the increased production of estrogen after menopause	D) reducing physical activity to protect bones

Answer & Explanation Answer: A) the formation of dense bones during youth

Explanation:

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Filed Under: Biology
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Q:

The three - time Formula One champion who passed away recently

Answer

Sir Jack Brabham

Workspace

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Subject: General Awareness

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