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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:

If the speed of an object moving along a straight line keeps changing, its motion is said to be _________.

A) Uniform B) Periodic
C) Circular D) Non-uniform
 
Answer & Explanation Answer: D) Non-uniform

Explanation:
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Filed Under: Physics
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Q:

Which state government has launched poshan Abhiyan, to eradicate malnutrition?

A) Gujarat B) Maharashtra
C) Mizoram D) Tripura
 
Answer & Explanation Answer: A) Gujarat

Explanation:
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Filed Under: General Awareness
Exam Prep: AIEEE , Bank Exams , CAT , GATE
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Q:

 A transaction for which all committed changes are permanent is called:

A) atomic. B) consistent.
C) isolated. D) durable.
 
Answer & Explanation Answer: D) durable.

Explanation:
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Filed Under: Database

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Q:

Which of the following is a microeconomic statement? 

A) The price of personal computers declined last year. B) Unemployment was 6.8 percent of the labor force last year.
C) The real domestic output increased by 2.5 percent last year. D) The general price level increased by 4 percent last year.
 
Answer & Explanation Answer: A) The price of personal computers declined last year.

Explanation:
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Filed Under: Indian Economy
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Q:

Which formula represents a molecular compound?

A) Ar B) NaI
C) N2O4 D) All of the above
 
Answer & Explanation Answer: C) N2O4

Explanation:

Molecular compounds are those with covalent bonds between the elements and those elements are typically non metals.

 

Here in the given options, Ar is an element. NaI has an ionic bond. Hence, N2O4 has a covalent bond between the two non metals and is a molecular compound.

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Filed Under: Chemistry
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Q:

Which formula represents an amino acid?

A) R-CH3(NH2)-COOH B) R-CH(NH2)-COOH
C) R-CH2(NH2)-COOH D) R-CH3(NH2)-COH
 
Answer & Explanation Answer: B) R-CH(NH2)-COOH

Explanation:

Amino acids are the building blocks of proteins. There are about 21 essential amino acids in the human body like histidine, leucine, lysine... The general formula for amino acid is R-CH(NH2)-COOH.

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Filed Under: Biology
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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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