# IGCSE Physics Paper-1: Specimen Questions with Answers 68 - 70 of 149

## Question 68

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### Question

MCQ▾

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

### Choices

Choice (4)
a.It falls with constant speed.
b.It falls with decreasing acceleration.
c.It falls with constant acceleration.
d.It falls with decreasing speed.

c.

### 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 69

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### Question

MCQ▾

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

### Choices

Choice (4)
a.atmospheric pressure
b.h cm of mercury
c.atmospheric pressure + h cm of mercury
d.approximately zero

d.

### 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 70

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### Question

MCQ▾

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?

### Choices

Choice (4)
a.cool the washer and rod to the same temperature and push them together
b.heat the rod and then place it in the hole
c.cool the washer and put it over the rod
d.heat the washer and place it over the rod