Mathematics [NSTSE (National Science Talent Search Exam- Unified Council) Class 8]: Questions 70 - 73 of 1201

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Question 70

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Question

MCQ▾

The twice the son’s age in years is added to the father’s age, the sum is 50. But if twice the father’s age is added to the son’s age, the sum is 85. Then the ages of father and son respectively are:

Choices

Choice (4)Response

a.

45 yrs, 10 yrs

b.

30 yrs, 15 yrs

c.

40 yrs, 5 yrs

d.

25 yrs, 10 yrs

Question 71

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Question

MCQ▾

How much pure alcohol should be added to 300 ml of strength 20 % to make its strength 45%?

Choices

Choice (4)Response

a.

198 ml

b.

154 ml

c.

167.36 ml

d.

136.36 ml

Question 72

Mathematics
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Question

MCQ▾

Express as rational number.

Choices

Choice (4)Response

a.

b.

c.

d.

Question 73

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Question

MCQ▾

PQ and RS are diameters. Then PRQS is:

Circle cCircle c: Circle through Q with center OSegment fSegment f: Segment [Q, P] Segment gSegment g: Segment [R, S] Segment hSegment h: Segment [P, S] Segment iSegment i: Segment [R, Q] Segment jSegment j: Segment [Q, S] Segment kSegment k: Segment [P, R] Point OO = (4.28,0.22) Point OO = (4.28,0.22) Point OO = (4.28,0.22) Point QQ = (6, -2.18) Point QQ = (6, -2.18) Point QQ = (6, -2.18) Point PPoint P: Point on cPoint PPoint P: Point on cPoint PPoint P: Point on cPoint RPoint R: Point on cPoint RPoint R: Point on cPoint RPoint R: Point on cPoint SPoint S: Point on cPoint SPoint S: Point on cPoint SPoint S: Point on c

Image of a Circle Having Diameters Intersecting Each Other

Choices

Choice (4)Response

a.

Isosceles trapezium

b.

Rectangle

c.

Trapezium

d.

Square