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

Question 129

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Question

MCQ▾

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

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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)
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 130

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Question

MCQ▾

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

Choices

Choice (4)
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 131

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Question

MCQ▾

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

Choices

Choice (4)
a.AND
b.NOR
c.NAND
d.OR

Answer

d.

Explanation

OR gate

Image of the Gate

Image of the Gate

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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

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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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