IGCSE Physics Paper-1: Specimen Questions with Answers 58 - 60 of 149

Question number: 58

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Question

In which state energy change is taking place in this graph?

Graph of Temperature ⟶ Time

Graph of Temperature ⟶ Time

Choices

Choice (4)

a.

P and S

b.

Q and R

c.

P and R

d.

Q and S

Answer

d.

Explanation

In above figure we show the phase diagram

As we start to apply heat then molecule inside the solid are expand and phase change from solid to liquid. Again we increase temperature then again phase change from liquid to gas. So, at Q and S parts of the graph show a change of state taking place

Question number: 59

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Question

Why a person does not takes time to feel hot if he fills steel beaker with hot water?

Choices

Choice (4)

a.

Steel is a poor conductor of heat.

b.

Steel is a good conductor of heat.

c.

Water is a poor conductor of heat.

d.

Question does not provide sufficient data or is vague

Answer

b.

Explanation

Conductor means is allowed to flow something. We can also say that it allowed to passing something from heat. In this case it immediately heats up as steel is good conductor. Because steel glass is good conductor of heat, so it passing the heat of water to his hand very fast.

Question number: 60

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Question

Which form of energy is increasing as man dives or falls?

A man is diving into water

A Man is Diving into Water

Choices

Choice (4)

a.

Strain

b.

Gravitational

c.

Chemical

d.

Kinetic

Answer

d.

Explanation

As we know that kinetic energy is the energy which possesses due to motion.

It is also defined as work needed to accelerate the body of the given mass from reset to its start velocity. As body accelerates the kinetic energy is increase. And because of gravitational force the acceleration increases and therefore kinetic energy increases.

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