# IGCSE Physics Paper-2: Specimen Questions with Answers 13 - 18 of 20

## Question number: 13

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Fill-Blanks▾

Boiling point of the water is ________

1000 C

## Passage

Here are two words relating to the transfer of thermal energy. (Conductor and insulator). Complete each of the following sentences by writing in the appropriate word from the lost.

## Question number: 14 (1 of 3 Based on Passage) Show Passage

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Wood is a good ________ of electric current.

Insulator

## Question number: 15 (2 of 3 Based on Passage) Show Passage

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### Write in Short

The electric wire is often coated by plastic, because plastic is a good electric ________.

### Explanation

Insulator

The electric wire is often coated by plastic, because plastic is good electric insulator and without insulation, the electricity running in a bare cable would leap over into any other electrically conducting material it touched. With enough voltage, a human could be electrocuted. Also electrical signals would disappear and get lost, causing equipment to fail.

## Question number: 16 (3 of 3 Based on Passage) Show Passage

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Copper metal is a good ________ of electric current.

Conductor

## Question number: 17

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### Write in Short

A radioactive substance has a half-life of 22 years. How much time must pass before its activity falls to of its original value?

### Explanation

Half – life of radioactive substance is given as,

Now, for time taken before activity falls to of its original value is calculated as,

## Passage

The ray diagram in below figure shows a lens forming an image of an object .

## Question number: 18 (1 of 3 Based on Passage) Show Passage

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One Liner Question▾

### Write in Brief

If a plane mirror placed instead of diverging lens, size of the image is –

### Explanation

The dimensions of the image formed by a plane mirror are remaining same dimension of the object. Therefore size of the image formed by the plane mirror is same as that of the object.

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