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

## Question number: 143

### 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

### 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.

### 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

### 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/s | |

b. | 4 m/s | |

c. | 6 m/s | |

d. | 5 m/s |

### 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/s^{2}