Question : Ozone protects biosphere from:

Option 1: X -rays

Option 2: Gamma rays

Option 3: Ultraviolet rays

Option 4: Infrared rays

Question : Which of the following waves cannot be polarized?

Option 1: Radio

Option 2: Ultraviolet

Option 3: Infrared

Option 4: Ultrasonic

Question : If $x=(0.25)^\frac{1}{2}$, $y=(0.4)^{2}$, and $z=(0.216)^{\frac{1}{3}}$, then:

Option 1: $y>x>z$

Option 2: $x>y>z$

Option 3: $z>x>y$

Option 4: $x>z>y$

Question : The ozone layer is formed due to reactions of:

Option 1: oxygen and ultraviolet rays

Option 2: carbon dioxide and layers of the atmosphere

Option 3: cosmic rays and layers of atmosphere

Option 4: infrared rays and ultraviolet rays

Question : If $x^2+\frac{1}{x^2}=7$, then the value of $x^3+\frac{1}{x^3}$ where x > 0 is equal to:

Option 1: 18

Option 2: 12

Option 3: 15

Option 4: 16