# IGCSE Physics Paper-1: Specimen Questions with Answers 32 - 34 of 149

## Question number: 32

### Question

4 divers are there, 2 in sea water and 2 in fresh water. Which diver will face greatest pressure known that sea water is denser than fresh water?

### Choices

Choice (4) | Response | |
---|---|---|

a. | D | |

b. | A | |

c. | B | |

d. | C |

### Answer

c.### Explanation

Pressure in liquid we can define as

Where ρ = Density of liquid

g = Gravitational acceleration

h = Height above the point at which we measure the pressure

In this case density of sea water is denser fresh water and height of diver B is more.

Thus on diver B is there the greatest pressure.

## Question number: 33

### Question

If we cut cotton at two point (indicated by blue line), then length of part1, part 2 and part 3 of cotton are,

### Choices

Choice (4) | Response | |
---|---|---|

a. | 24.6cm, 15.6 cm, 2.5 cm | |

b. | 1.6cm, 7.5cm, 4.1 cm | |

c. | 1.2cm, 2.6cm, 3.9 cm | |

d. | 3.4cm, 13.2cm, 4.1 cm |

### Answer

b.### Explanation

Here we show that cotton on the scale at starting point of rural is 2.4 cm and end point of rural is 15.6cm.

There are two cut on the cotton

So there are total three part of cotton

Then length of part1 is,

Length of part 2 is,

Length of part 3 is,

## Question number: 34

### Question

Find average speed of molecules in 2 boxes if they are filled with air and one is on heater 1 and the other is on heater 2.

### Choices

Choice (4) | Response | |
---|---|---|

a. | Box X – Fast, Box Y – Slow | |

b. | Box X – Fast, Box Y – Zero | |

c. | Box X – Zero, Box Y – Fast | |

d. | Box X – Slow, Box Y – Fast |

### Answer

a.### Explanation

Here box X is on heater1 and the box Y is on heater2.

Then molecule in box X is moving fast then Y. Because on heater due to heat the molecules move fast but heater 1 has more power than heater 2. Therefore molecules in X is move faster