Mathematics (2017) | Study Mode

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Question 1
A
{2, 3}
B
{2, 3, 4}
C
{3, 4, 6}
D
{2}
Explanation

T = {evenn numbers from 1 to 12}
N = {common factors of 6,8 and 12}
Find T N
T = {2, 4, 6, 8, 10, 12}
N = {2}
T N = {2} i.e value common to T & N


Correct option: D
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Question 2
A

2.6cm

B

3.5cm

C

3.6cm

D

7.0cm

Explanation
Curved surface area of cylinder = 2rh

110 = 2 \(\times\) \(\frac{22}{7}\) \(\times\) r \(\times\) 5

r = \(\frac{110 \times 7}{44 \times 5}\)

= 3.5cm

Correct option: B
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Question 3
A

q - \(\frac{8}{7}\)

B

7 - \(\frac{q}{4}\)

C

8 - \(\frac{q}{2}\)

D

7 + \(\frac{q}{8}\)

Explanation
Y = Px2 + q

Y = 2x2 - 1

Px2 + q = 2x2 - 1

Px2 = 2x2 - 1 - q

p = \(\frac{2x^2 - 1 - q}{x^2}\)

at x = 2

P = \(\frac{2(2)^2 - 1 - q}{2^2}\)

= \(\frac{2(4) - 1 -q}{4}\)

= \(\frac{8 - 1 - q}{4}\)

P = \(\frac{7 - q}{4}\)

Correct option: B
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Question 4
Mathematics (2017) Q 6 image
A

\(\frac{\sqrt{3}}{2\sqrt{2}}\)

B

-3 - \(\frac{1}{2}\)

C

\(\frac{1}{2}\)-2

D

1 + \(\frac{\sqrt{2}}{2}\)

Explanation

hypotenuse
sin = \(\frac{1}{2}\)

\(\sin45 = \frac{1}{\sqrt{2}}\)

= \(\frac{2}{2}\)

= (sin45 + sin30)

= \(\frac{1}{\sqrt{2}} + \frac{1}{2}\)

= \(\frac{\sqrt{2}}{2}\) + \(\frac{1}{2}\)

= \(\frac{\sqrt{2} + 1}{2}\)

= \(\frac{1 + \sqrt{2}}{2}\)


Correct option: D
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Question 5
A
\(\frac{- \pi}{2}\)
B
-1
C
1
D
\(\frac{ \pi}{2}\)
Explanation

y = xsinx

\(\frac{dy}{dx} = 1 \sin x + x \cos x \)

= \(\sin x + x \cos x\)

At x = \(\frac{\pi}{2}\)

= sin\(\frac{\pi}{r}\) + \(\frac{\pi}{2} \cos {\frac{\pi}{2}}\)

= 1 + \(\frac{\pi}{2}\) \(\times\) 10

= 1


Correct option: C
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Question 6
A

24oC

B

20oC

C

34oC

D

30oC

Explanation
t h, t = 20, h

t = ? h = 60

t = kh where k is constant

20 = 50k

k = \(\frac{20}{50}\)

k = \(\frac{2}{5}\)

when h = 60, t = ?

t = \(\frac{2}{5}\) \(\times\) 60

t = 24oC

Correct option: A
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Question 7
A
4
B
3
C
2\(\frac{2}{3}\)
D
3\(\frac{2}{3}\)
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: D
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Question 8
A
\(\frac{\text{NSL}}{M}\)
B
\(\frac{N^2SL}{M^2}\)
C
\(\frac{N^2SL}{M}\)
D
\(\frac{NSL}{M^2}\)
Explanation
M = \(\frac{\sqrt{SL}}{T}\),

make T subject of formula square both sides

M2 = \(\frac{N^2SL}{T}\)

TM2 = N2SL

T = \(\frac{N^2SL}{M^2}\)

Correct option: B
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Question 9
A

3\(^{2n}\)

B

9

C

3n

D

3 \(^{n + 1}\)

Explanation
3\(^{n + 1}\) \(\times\) 27\(\frac{n + 1}{81^n}\)

= 3\(^{n + 1}\) \(\times\) 3 \(\frac{3^{(n + 1)}}{3^{4n}}\)

= 3\(^{n - 1 + 3n + 3 - 4n}\)

= 3\(^{4n - 4n - 1 + 3}\)

= 32

= 9

Correct option: B
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Question 10
A
\(\frac{3}{4}\)
B
\(\frac{3}{10}\)
C
\(\frac{1}{4}\)
D
\(\frac{1}{20}\)
Explanation
U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20}

E1 = {3, 6, 9, 12, 15, 18}

E2 = {4, 8, 12, 16, 20}

Probability of E2 = \(\frac{5}{20}\) i.e \(\frac{\text{Total number in}E_2}{\text{Entire number in set}}\)

Probability of set E2 = 1 ? \(\frac{5}{20}\)

= \(\frac{15}{20}\)

= \(\frac{3}{4}\)

Correct option: A

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