IGCSE Physics Paper-1: Specimen Questions with Answers 84 - 87 of 149

Question number: 84

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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)

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 number: 85

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MCQ▾

Question

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.

Question number: 86

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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)

a.

0.12 g

b.

0.03 g

c.

1.76 g

d.

7.68 g

Answer

c.

Explanation

Here from given data

Formula of half-life is given as,

Question number: 87

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MCQ▾

Question

The diagram shows a speed-time graph for a body moving with constant acceleration. What is the shaded area under the graph?

Graph of Speed versus Time

Graph of Speed Versus Time

Choices

Choice (4)

a.

speed

b.

distance

c.

time

d.

acceleration

Answer

b.

Explanation

Here in above figure the graph of speed vs time is given.

Then area under the graph denoted speed ⨯ time.

As we know that speed means velocity

Then in this graph area under the graph is distance.

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