IGCSE Physics Paper-1: Specimen Questions with Answers 143 - 145 of 149

Question number: 143

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Question

Potential difference is measured by

Choices

Choice (4)Response

a.

Galvanometer

b.

wattmeter

c.

voltmeter

d.

Ammeter

Answer

c.

Explanation

  • The amount of energy that charge carriers have between two points in a circuit is known as potential difference.

  • The Potential difference of 1 volt is 1 joule of energy is transferred for each coulomb of charge that is moving through the circuit.

  • The potential difference is measured by Voltmeter.

Question number: 144

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Question

Two persons sit on the seesaw, person B is applying force 300N and 0.5m from the pivot. Person A is applying force of 400N. Calculate the distance that person A must sit from the pivot to balance it.

Image of the Pivot

Image of the Pivot

Choices

Choice (4)Response

a.

0.52m

b.

1.5m

c.

0.37m

d.

1.0m

Answer

c.

Explanation

Moment (Nm)

Anticlockwise moment = clockwise moment

Force

Distance (m) =

Question number: 145

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Question

A car can accelerate to a speed of 30 m⧵s from rest in 5 seconds. What is its average acceleration?

Choices

Choice (4)Response

a.

0 m/s2

b.

4 m/s2

c.

6 m/s2

d.

5 m/s2

Answer

c.

Explanation

At

a =

Here u is the initial speed (in rest)

v is the final speed = 30 m/s

t = time

Then

a = =

m/s2

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