Question : Which of the following is the outer layer of the Earth that is made of plates which fit together like a jigsaw puzzle?

Option 1: Mesosphere

Option 2: Asthenosphere

Option 3: Biosphere

Option 4: Lithosphere

Question : Out of two concentric circles, the radius of the outer circle is 6 cm and the chord PQ of the length 10 cm is a tangent to the inner circle. Find the radius (in cm) of the inner circle.

Option 1: $4$

Option 2: $\sqrt{7}$

Option 3: $\sqrt{13}$

Option 4: $\sqrt{11}$

Question : Which is the most abundant mineral in the Earth's continental crust?

Option 1: Pyroxenes

Option 2: Quartz

Option 3: Feldspar

Option 4: Mica

Question : Supersonic jets cause thinning of which layer?

Option 1: O₂ layer

Option 2: O₃ layer

Option 3: CO₂ layer

Option 4: SO₂ layer

Question : Which of the following helps keep the Earth's atmosphere in place?

Option 1: The gravitational force of the moon

Option 2: Rotation of the Earth on its axis

Option 3: The gravitational force of the Earth

Option 4: The gravitational force of the Sun