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#### 12th Standard Business Maths English Medium Free Online Test Book Back 1 Mark Questions with Answer Key - Part Three

12th Standard EM

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Time : 00:10:00 Hrs
Total Marks : 10
10 x 1 = 10
1. $\left| { A }_{ n\times n } \right|$=3 $\left| adjA \right|$ =243 then the value n is

(a)

4

(b)

5

(c)

6

(d)

7

2. $\Gamma \left( \frac { 3 }{ 2 } \right)$

(a)

$\sqrt { \pi }$

(b)

$\frac { \sqrt { \pi } }{ 2 }$

(c)

$2\sqrt { \pi }$

(d)

$\frac32$

3. The area bounded by the parabola y2 = 4x bounded by its latus rectum is

(a)

$\frac { 16 }{ 3 }$sq.units

(b)

$\frac { 8 }{ 3 }$sq.units

(c)

$\frac { 72 }{ 3 }$sq.units

(d)

$\frac { 1 }{ 3 }$sq.units

4. Which of the following is the homogeneous differential equation?

(a)

(3x−5)dx = (4y−1)dy

(b)

xy dx−(x3+y3)dy = 0

(c)

y2dx+(x− xy  − y2)dy = 0

(d)

(x2+y)dx = (y2+x)dy

5. If f (x)=x+ 2x + 2 and the interval of differencing is unity then Δf (x)

(a)

2x −3

(b)

2x +3

(c)

x + 3

(d)

x − 3

6. The height of persons in a country is a random variable of the type

(a)

discrete random variable

(b)

continuous random variable

(c)

both (a) and (b)

(d)

neither (a) nor (b)

7. If P(Z > z) = 0.5832 what is the value of z (z has a standard normal distribution)?

(a)

-0.48

(b)

0.48

(c)

1.04

(d)

-0.21

8. Type II error is

(a)

Accept H0 when it is wrong

(b)

Accept H0 when it is true

(c)

Reject H0 when it is true

(d)

Reject H0 when it is false

9. Most commonly used index numbers are _________ index number

(a)

diffusion

(b)

price

(c)

value

(d)

none ofthese

10. Decision theory is concerned with

(a)

analysis of information that is available

(b)

decision making under certainty

(c)

selecting optimal decisions in sequential problem

(d)

All of the above