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

Question number: 13

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Boiling point of the water is ________

Answer

Explanation

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.

Answer

Explanation

Insulator

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

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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.

Answer

Explanation

Conductor

Question number: 17

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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 .

Ray diagram of diverging lens

Ray Diagram of Diverging Lens

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

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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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