IGCSE Physics Paper-1: Specimen Questions with Answers 129 - 131 of 149

Question number: 129

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Question

The ends of four metal rods are tested by holding end S of rod2 close to others in turn.

Image Four metal rods

Image Four Metal Rods

End of S: attracts end p

Attracts end Q

Attracts end T

Repels end U

Attracts end V

Attracts end W

Which metal rod is not a magnet?

Choices

Choice (4)Response

a.

rod 2 and rod3

b.

rod1 and rod4

c.

rod2 only

d.

rod 1 only

Answer

b.

Explanation

  • The magnets are produces magnetic field.

  • It has north and south poles.

  • The same poles either north or south poles gets repulse.

  • The unlike poles north and south gets attracted.

  • Induced magnets are having a property to get attracted when they placed close to the magnetic materials such as iron.

  • The materials which both rod1 and rod4 are not magnets. They are induced magnets.

Question number: 130

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Question

The table shows the voltage and current rating for four electric heaters. Which heater has the highest resistance?

Choices

Choice (4)Response

a.

b.

c.

d.

Answer

b.

Explanation

Voltage V = IR (I = current, R = resistance)

For the resistance R =

R = = =

R = = =

R = = = Highest resistance

R = = =

Question number: 131

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Question

Which of the following gate of output is 1 if input A or input B or both are 1.

Choices

Choice (4)Response

a.

AND

b.

NOR

c.

NAND

d.

OR

Answer

d.

Explanation

OR gate

Image of the Gate

Image of the Gate

OR gate is a digital logic gate. It works according to the truth table.

Image of the The truth table

Image of the the Truth Table

Output is 1 if input A OR input B OR both is 1

The output is 0 if the both input A and B are 0.

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