47
Q:

Damage to hearing is caused by sounds which exceed

A) 70 decibels B) 80 decibels
C) 100 decibels D) 120 decibels

Answer:   D) 120 decibels



Explanation:

High frequency sound attacks the tympanic memberance and makes it defective. 120 decibels is too high a pitch to be heard and therefore it impairs the hearing ability.

Subject: Biology
Q:

What is the basis of classifying various plant tissues as meristematic tissue and permanent tissue?

 

A) Size B) Dividing capacity
C) Location D) No option is correct
 
Answer & Explanation Answer: B) Dividing capacity

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0 64
Q:

Match the following.

 

 

A) I – 2, II – 3, III – 1   B) I – 1, II – 3, III – 2  
C) I – 2, II – 1, III – 3   D) I – 3, II – 2, III – 1
 
Answer & Explanation Answer: D) I – 3, II – 2, III – 1

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0 125
Q:

Which part of the human reproductive system helps the embryo get its nutrition from the mother's blood?

A) Placenta B) Fallopian tube
C) Uterus D) Cervix
 
Answer & Explanation Answer: A) Placenta

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2 129
Q:

The universal natural auxin of plants is

A) IBA B) Citric auxin
C) NAA D) IAA
 
Answer & Explanation Answer: D) IAA

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0 135
Q:

Anaemic condition is due to

A) Deficiency of platelets B) Deficiency of RBC
C) Deficiency of WBC D) Deficiency of oxidants
 
Answer & Explanation Answer: B) Deficiency of RBC

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0 134
Q:

Which organ is not a gland?

A) Adrenal B) Liver
C) Pituitary D) Gall bladder
 
Answer & Explanation Answer: D) Gall bladder

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1 154
Q:

Yellow fever is mainly transmitted among humans by

A) Female mosquito bite B) Male mosquito bite
C) Water D) Air
 
Answer & Explanation Answer: A) Female mosquito bite

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1 129
Q:

Slow-growing large coloured patches on the bark of trees are the examples of symbiotic life forms called ______.

 

A) Aphids B) Egrets
C) Shrimps D) Lichens
 
Answer & Explanation Answer: D) Lichens

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2 135