KVPY Stream-SA (Class 11) Math: Questions 192 - 197 of 251

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Question number: 192

» Permutations and Combinations » Simple Applications

MCQ▾

Question

If n C r-1 = 8, n C r = 28, and n C r + 1 = 56; than value of n and r respectively –

Choices

Choice (4) Response
a.

n=8,r=2

b.

n=10,r=4

c.

n=9,r=4

d.

n=7,r=3

Question number: 193

» Basic Mathematics » Arithmetic » Rates, Speeds and Unitary Method

MCQ▾

Question

12 women can complete a work in 5 days and 12 children take 10 days to complete a work. How many days will 3 women and 6 children take to complete the work?

Choices

Choice (4) Response
a.

12

b.

8

c.

9

d.

10

Question number: 194

» Complex Numbers and Quadratic Equations » Relation Between Roots and Coefficients

MCQ▾

Question

If the roots of the equation (a2b2)x22(acbd)x+(c2d2)=0 are equal then,

Choices

Choice (4) Response
a.

ac=bd

b.

ad+bc=0

c.

ab=dc

d.

ab=cd

Question number: 195

» Basic Mathematics » Arithmetic » Simplifying Expressions

MCQ▾

Question

If α is the root of x2+5x2=0 then other root β is –

Choices

Choice (4) Response
a.

β=2α2+10α6α

b.

β=α2+5α7

c.

β=2α5α2

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

Question number: 196

» Trigonometry » Trigonometric Functions

MCQ▾

Question

If x=tanθ+secθ and y=cotθcosecθ , then

Choices

Choice (4) Response
a.

1xy=x2y

b.

1xy=x+y

c.

1xy=xy

d.

1xy=yx

Question number: 197

» Complex Numbers and Quadratic Equations » Relation Between Roots and Coefficients

MCQ▾

Question

If α2β2 =54, where α, β are the roots of the equation 2x2+5x+c=0, then the value of c is –

Choices

Choice (4) Response
a.

3

b.

2

c.

0

d.

4

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