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Answer 1

Answer:

question 11. At sea level, pure water boils at 212 °F (100°C). At the lower atmospheric pressure on the top of Mount Everest, pure water boils at about 154 °F (68°C).

12] Sublimation is the process of transformation directly from the solid phase to the gaseous phase, without passing through an intermediate liquid phase.

13] Favorable conditions for converting a gas to liquid are high pressure and low temperature. Explanation: Favorable conditions for converting a gas to liquid are high pressure and low temperature. This change is called a phase change.

14] The term used to indicate the conversion of vapour to solid is called deposition.

15] Distance is the length of the actual path covered by a moving body. This implies that the distance travelled by a moving body and also its average speed can never be zero at any point of time. So, option C is correct.

16] The displacement after half a circle would be. Hence, the displacement aftar half circle is 2r.

17] If the displacement of an object is proportional to the square of the time taken then the body is moving with uniformly accelerated motion as it will follow Newton's second equation of motion for a particular initial velocity, which can be given by, s=ut+21​at2.

18] Unit of acceleration is the metre per second per second (m/s^2)

19] u+v/2 where u is the initial velocity and v is the final velocity.

20] Initial speed u = 80 km/h= 80 × $\frac{5}{18}$ = 22.22 m/s

Final speed v= 60 km/h = 60 × $\frac{5}{18}$ = 16.67 m/s

Using v = u +at

or 16.67 = 22.22 + a × 5

⇒  a = -1.1 m/s²

Explanation:

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Answer 2

11: B

12: sublimation, liquid

13: A

14 : deposition

15 : D

16 : 2r

17 : D

18 : A

20: C