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Q:

The rate of heartbeat is accelerated by the harmone

A) adrenaline B) acetylcholine
C) thyroxine D) pituitrin
 
Answer & Explanation Answer: A) adrenaline

Explanation:

The hormone adrenaline also called epinephrine is known as a stress harmone. In emotional upset (like fear, anger etc.) this harmone is poured into the blood and it accelerates heart beat. The hormone acetylcholine decelerates heartbeat rate.

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Filed Under: Biology

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

Q:

Enzymes are produced by

A) endocrine glands B) exocrine glands
C) liver D) spleen
 
Answer & Explanation Answer: B) exocrine glands

Explanation:

Glands are of two types. The exocrine glands have ducts to carry their secretions and these secretions contain enzymes. on the other hand, endocrine glands are ductless glands and they secrete mainly horomones.

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Filed Under: Biology

Q:

Dust particles in the air of large industrial cities are removed by 

A) Sedimentation B) Electrophoresis
C) Tyndall effect D) Brownian movement
 
Answer & Explanation Answer: B) Electrophoresis

Explanation:

Dust particles such as coal dust(smoke) are fine particle of a solid (carbon in the case of smoke) dispersed in air. They are colloidal systems and the particles are charged either positive or negative. In an applied electrical field, they are attracted towards the opposite electrodes. Movement of the particles towards the electrodes is known as 'electrophoresis'. Hence electrophoresis is applied to remove smoke within the chimeny itself without allowing it to escape into the air and cause nuisance.

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Filed Under: Chemistry

Q:

Leakage in LP gas cylinders is easily detected by adding

A) mercaptans B) propylene
C) carbon disulphide D) phosgene
 
Answer & Explanation Answer: A) mercaptans

Explanation:

mercaptans (or thioalcohols) have a foul odour

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Filed Under: Chemistry

Q:

Water always contains hydrogen and oxygen in the ratio 1:8 by weight.This is in accordance with the 

A) Law of Multiple Proportions B) Law of Definite Proportion
C) Law of Conservation of mass D) Law of Reciprocal Proportions
 
Answer & Explanation Answer: B) Law of Definite Proportion

Explanation:

The Law of Definite Proportion states that the same compound, wherever found or however made, always contains the same elements combined together in the same fixede ratio by weight.

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Filed Under: Chemistry

Q:

Harmful bacteria in drinking water cannot be destroyed by 

A) Chlorination B) boiling
C) adding caustic soda D) ozonisation
 
Answer & Explanation Answer: C) adding caustic soda

Explanation:

Water containing caustic soda cannot be used for drinking

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Filed Under: Chemistry

Q:

The first cellular phone service in india was introduced by ________

Answer

The first cellular phone service in india was introduced by Modi Telstra on August 23, 1995 in calcutta under the name Mobile Net. 

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Subject: General Awareness