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

Question 13

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Question

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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 14 (1 of 3 Based on Passage)

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Question

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Wood is a good ________ of electric current.

Answer

Explanation

Insulator

Question 15 (2 of 3 Based on Passage)

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Question

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Copper metal is a good ________ of electric current.

Answer

Explanation

Conductor

Question 16 (3 of 3 Based on Passage)

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Short Answer▾

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 17

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Short Answer▾

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

Question 18 (1 of 3 Based on Passage)

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One Liner▾

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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