NSTSE (National Science Talent Search Exam Unified Council) Class 9: Questions 742  748 of 2000
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Question number: 742
Question
= ________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d.  0 

Question number: 743
Question
25 years ago, when my parents got married, their average age was 30 years, now the average age of my family, consisting of myself and my parents only is 40 years. My present age is
Choices
Choice (4)  Response  

a.  10 years 

b.  12 years 

c.  20 years 

d.  18 years 

Question number: 744
Question
The mean of 7, x, 11, y and 21 is 14. Then
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 745
» Mathematics » Number Systems
Question
The greatest among is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d.  Question does not provide sufficient data or is vague 

Question number: 746
Question
A book containing 400 pages is opened at random. The probability that a triplet page is found is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d.  Question does not provide sufficient data or is vague 

Question number: 747
» Mathematics » Surface Areas & Volumes
Question
A cylindrical vessel of diameter 16 cm is partly filled with water. 180 lead balls are dropped in it. The raise in water level is 1.4 cm. The diameter of each ball is ________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 748
» Mathematics » Number Systems
Question
Which of the following statements is correct?
Choices
Choice (4)  Response  

a.  0 is called the additive identity for rational number 

b.  1 is called the multiplicative identity for rational number 

c.  The additive inverse of 0 is zero itself 

d.  All a. , b. and c. are correct 
