IGCSE Physics Paper-1: Specimen Questions with Answers 101 - 103 of 149

Question number: 101

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Question

An electrical component is to be placed in the circuit at X, to allow the brightness of the lamp to be varied from bright to dim. What should be connected at X?

Circuit diagram for adjust the brightness of bulb.

Circuit Diagram for Adjust the Brightness of Bulb.

Choices

Choice (4)Response

a.

Symbol of voltmeter (Choice a)

Symbol of Voltmeter (Choice A)

b.

Symbol of resistor box (Choice b)

Symbol of Resistor Box (Choice B)

c.

Symbol of variable resistor (Choice c)

Symbol of Variable Resistor (Choice C)

d.

Symbol of fuse (Choice d)

Symbol of Fuse (Choice D)

Answer

c.

Explanation

Here in circuit we want the brightness of the lamp to be varied from bright to dim

And for that we have to connect variable resistance because using variable resistance we can very current and then we can control the brightness of lamp.

Question number: 102

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Question

How many nucleons are in a nucleus of ?

Choices

Choice (4)Response

a.

20

b.

39

c.

19

d.

58

Answer

b.

Explanation

In , 19 represent the number of protons in nucleus, and 39 represent numbers of protons and neutrons in potassium nucleus. Therefore numbers of nucleons in a nucleus of is 39.

Question number: 103

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Question

A beam of cathode rays passes through an electric field between two parallel plates.

A beam of cathode inserted between two parallel plates

A Beam of Cathode Inserted between Two Parallel Plates

In which direction is the beam deflected?

Choices

Choice (4)Response

a.

out of the page

b.

into the page

c.

towards the top of the page

d.

towards the bottom of the page

Answer

c.

Explanation

Cathode rays carries negative charges, so when it passes through two plates as shown in figure positively charged plate attract this beam of cathode rays, therefore it deflected towards the top of the page.

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