#### 12th Standard Business Maths English Medium Free Online Test One Mark Questions with Answer Key 2020

12th Standard

Reg.No. :
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Time : 00:10:00 Hrs
Total Marks : 10

10 x 1 = 10
1. The rank of the unit matrix of order n is

(a)

n −1

(b)

n

(c)

n +1

(d)

n2

2. $\frac { { 2x }^{ 3 } }{ 4+{ x }^{ 4 } }$dx is

(a)

$log\left| 4+{ x }^{ 4 } \right| +c$

(b)

$\frac { 1 }{ 2 } log\left| 4+{ x }^{ 4 } \right| +c$

(c)

$\frac { 1 }{4 } log\left| 4+{ x }^{ 4 } \right| +c$

(d)

$log\left| \frac { { 2x }^{ 3 } }{ { 4+x }^{ 4 } } \right| +c$

3. ∫ (1-x) $\sqrt { x }$ dx = ______________+c

(a)

$\frac { 2 }{ 3 } { x }^{ \frac { 3 }{ 2 } }-\frac { 5 }{ 2 }$

(b)

${ x }^{ \frac { 3 }{ 2 } }-\frac { 2 }{ 5 } { x }^{ \frac { 5 }{ 2 } }$

(c)

$\frac { 3 }{ 2 } { x }^{ \frac { 2 }{ 3 } }-\frac { 5 }{ 2 } { x }^{ \frac { 2 }{ 5 } }$

(d)

$\frac { 2 }{ 3 } { x }^{ \frac { 3 }{ 2 } }-\frac { 2 }{ 5 } { x }^{ \frac { 5 }{ 2 } }$

4. The demand and supply functions are given by D(x)= 16 − x2 and S(x) = 2x2 + 4 are under perfect competition, then the equilibrium price x is

(a)

2

(b)

3

(c)

4

(d)

5

5. The area of the region bounded by y = x + 1, the X-axis and the lines x = 0, x = 1 is___________.

(a)

$\frac{1}{2}$

(b)

2

(c)

$\frac{3}{2}$

(d)

1

6. If X is a discrete random variable and p(x) is the probability of X, then the expected value of this random variable is equal to

(a)

$\sum { f(x) }$

(b)

$\sum[x+f(x)]$

(c)

$\sum { f(x)+x }$

(d)

$\sum { xp(x) }$

7. The parameters of the normal distribution $f(x)=\left(\frac{1}{\sqrt{72 \pi}}\right)$$\frac{e^{-(x-10)^{2}}}{72}$ –∞ <  x  <

(a)

(10,6)

(b)

(10,36)

(c)

(6,10)

(d)

(36,10)

8. In simple random sampling from a population of N units, the probability of drawing any unit at the first draw is

(a)

$\frac{n}{N}$

(b)

$\frac{1}{N}$

(c)

$\frac{N}{n}$

(d)

1

9. Another name of consumer’s price index number is:

(a)

Whole-sale price index number

(b)

Cost of living index

(c)

Sensitive

(d)

Composite

10. North-West Corner refers to ________

(a)

top left corner

(b)

top right corner

(c)

bottom right corner

(d)

bottom left corner