IGCSE Physics Paper-1: Specimen Questions with Answers 83 - 85 of 149

Question 83

Question

MCQ▾

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

Stopwatch Used in Race with Start and End Given

Choices

Choice (4)

a.

47.0 s

b.

46.0s

c.

46.5s

d.

45.7s

Answer

b.

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 84

Question

MCQ▾

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)

a.

0.03 g

b.

7.68 g

c.

1.76 g

d.

0.12 g

Answer

c.

Explanation

Here from given data

Formula of half-life is given as,

Question 85

Question

MCQ▾

How we find density of a regularly-shaped block?

Choices

Choice (4)

a.

a measuring cylinder and a beaker

b.

a measuring cylinder and a ruler

c.

a balance and a ruler

d.

a balance and a force meter (spring balance)

Answer

c.

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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