NSO Level 1 Science Olympiad (SOF) Class 10: Questions 77  82 of 986
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Question number: 77
Appeared in Year: 2011
Question
Consider the following statements: When two straight lines intersect,
(i) Adjacent angles are complementary
(ii) Adjacent angles are supplementary
(iii) Opposite angles are equal
(iv) Opposite angles are supplementary
Which of the following statements must be true?
Choices
Choice (4)  Response  

a.  (i) and (iv) 

b.  (ii) and (iii) 

c.  (ii) and (iv) 

d.  (i) and (iii) 

Question number: 78
Question
Three friends divided Rs. 585 among themselves in the ratio. The share of the second friend is?
Choices
Choice (4)  Response  

a.  Rs. 300 

b.  Rs. 90 

c.  Rs. 180 

d.  Rs. 200 

Question number: 79
» Chemical Reactions and Equation
Question
Iron rusts more slowly in contact with _
Choices
Choice (4)  Response  

a.  Less active metal 

b.  More active metal 

c.  More active non metal 

d.  Less active nonmetal 

Question number: 80
Question
“When acid or base dissolve in water with constant stirring at that time energy released. ” Which of the following is correct for this process?
Choices
Choice (4)  Response  

a.  It decreases in the concentration of ions per unit time. 

b.  Endothermic process 

c.  Exothermic process 

d.  Both a. and c. are correct 

Question number: 81
Question
Solve: , then find the value of x:
Choices
Choice (4)  Response  

a.  10 

b.  18 

c.  15 

d.  12 

Question number: 82
Question
The ratio between the radius of the base and the height of the cylinder is. If the volume is, the total surface area of the cylinder is ________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

