Question : If $a^{3}+\frac{1}{a^{3}}=2$, then the value of $\frac{a^{2}+1}{a}$ is ($a$ is a positive number):

Option 1: 1

Option 2: 2

Option 3: 3

Option 4: 4

Question : Which of the following devices is used to measure humidity?

Option 1: Hydrometer

Option 2: Hygrometer

Option 3: Psychrometer

Option 4: Anemometer

Question : If $(a+\frac{1}{a})^2=3$, the value of $(a^3+\frac{1}{a^3})$ is:

Option 1: $0$

Option 2: $3(a+\frac{1}{a})$

Option 3: $3(a^2+\frac{1}{a^2})$

Option 4: $1$

Question : If $(2+\sqrt{3})a=(2-\sqrt{3})b=1$, then the value of $\frac{1}{a}+\frac{1}{b}$ is:

Option 1: $1$

Option 2: $2$

Option 3: $2\sqrt{3}$

Option 4: $4$

Question : Production refers to 

Option 1: Destruction of utility.

Option 2: Creation of utility .

Option 3: Exchange value .

Option 4: Use of a product.