# CIE Physics Paper-1: Specimen Questions 83 - 85 of 109

## Question number: 83

MCQ▾

### Question

A stopwatch is used to note time of a race is shown in figure. How long did the race take?

### Choices

Choice (4) Response
a.

45.7s

b.

46.5s

c.

47.0 s

d.

46.0s

d.

### Explanation

From above figure, we can note down the start time is 0.5 s and end time is 46.5 s. Therefore race time is given as,

## Question number: 84

MCQ▾

### Question

Find the amount of sample left after 18 hours if the half-life is 8 hours and has 0.37 g of the substance.

### Choices

Choice (4) Response
a.

1.76 g

b.

0.12 g

c.

7.68 g

d. 0.03 g

a.

### Explanation

Here from given data

Formula of half-life is given as,

## Question number: 85

MCQ▾

### Question

How we find density of a regularly-shaped block?

### Choices

Choice (4) Response
a.

a measuring cylinder and a ruler

b.

a balance and a force meter (spring balance)

c.

a measuring cylinder and a beaker

d.

a balance and a ruler

d.

### Explanation

Here we want to measure density of regular shape so from formula,

Therefore from measuring mass a balance is used and Volume is measured by ruler.

Ruler is a straight strip with a smooth edge which is use as a guide in drawing straight line. Then we can measure perfect shape

So we should use a balance and a ruler.

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