CIE Physics Paper-1: Specimen Questions 68 - 70 of 109

Question number: 68

MCQ▾

Question

What can be explained about motion if small steel ball is dropped from a height?

Choices

Choice (4) Response
a.

It falls with decreasing speed.

b.

It falls with constant speed.

c.

It falls with decreasing acceleration.

d.

It falls with constant acceleration.

Answer

d.

Explanation

Here steel ball is dropped from height and we ignore air resistance. Therefore there is no any opposite force for motion. So, steel ball dropped with constant gravitational acceleration.

Question number: 69

MCQ▾

Question

Simple mercury barometer and reading is h cm of mercury. Find pressure at S.

A simple mercury barometer with reading

A simple mercury barometer with reading

In figure a simple mercury barometer is shown with reading h cm.

Choices

Choice (4) Response
a.

atmospheric pressure

b.

atmospheric pressure + h cm of mercury

c.

approximately zero

d.

h cm of mercury

Answer

c.

Explanation

here we show barometer is used to measure pressure.

In above figure reading of barometer is h cm. In this barometer is closed so atmospheric pressure is not acting. At point S there is only vacuum present so pressure at S is approximately zero.

Question number: 70

MCQ▾

Question

Aim: Fix a steel washer on to a steel rod. What to do if rod is just too big to fit into the hole of the washer?

Steel rod and steel washer

Steel rod and steel washer

In figure a steel washer to be fix on a steel rod is shown.

Choices

Choice (4) Response
a.

heat the rod and then place it in the hole

b.

cool the washer and rod to the same temperature and push them together

c.

cool the washer and put it over the rod

d.

heat the washer and place it over the rod

Answer

d.

Explanation

Engineer wants to fix a steel washer on to a steel rod. In above case steel washer is smaller than road

Now, if we apply heat to washer then tightly bounded molecules inside the steel washer are become loose and they expand. Due to it rod is easily fit inside steel washer.

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