IGCSE Physics Paper-2: Specimen Questions with Answers 13 - 19 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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Copper metal is a good ________ of electric current.

Answer

Explanation

Conductor

Question 15 (2 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 16

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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

Ray Diagram of Diverging Lens

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Question 17 (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.

Question 18 (2 of 3 Based on Passage)

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One Liner▾

Which distance is focal length of the lens?

Explanation

Distance from C to point F (CF) is the focal length of the lens.

Question 19 (3 of 3 Based on Passage)

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One Liner▾

Write description of image.

Explanation

In figure image of object formed by diverging lens is virtual, smaller than the object and not inverted.

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