Question

Assertion [A]: Pressure cookers are similar to volcanoes.

Reason [R]: Pressure is built up in cookers and volcanoes, and released through a vent.

• A. [A] is true but [R] is false.
• B. [A] and [R] are false.
• C. [A] and [R] are true but [R] is not the correct justification for [A].
• D. [A] and [R] are true and [R] is the correct justification for [A].

Answer 1

The correct option is D [A] and [R] are true and [R] is the correct justification for [A].

In pressure cookers, rice puffs up and occupies more space as the temperature increases and the water boils. Complementary to this is the expansion of the air within the cooker as a result of an increase in temperature. A combination of the two results in steam being let out through the vent in the lid. In similar fashion, pressure is built up within volcanoes and molten material is spewed out through vents or fissures in the Earth's crust.