# IGCSE Physics Paper-1: Specimen Questions with Answers 77 - 79 of 149

## Question 77

### Question

MCQ▾

What would be the best unit to measure this?

Choice (4)

a.

mm2

b.

cm2

c.

mm3

d.

cm3

c.

### Explanation

The given figure shows the measuring cylinder which measure volume of the liquid. And the scale shown in figure is in mm, so volume of liquid measure by this cylinder is in mm3

## Question 78

### Question

MCQ▾

A radio broadcasting shows 200 m. What does 200 m stand for?

Choice (4)

a.

its speed

b.

its wavelength

c.

its frequency

d.

its amplitude

b.

### Explanation

Here a woman turns her radio to a station broadcasting on 200 m.

Frequency means one complete revolution per unit time and unit of frequency is Hz or 1/s, amplitude is unit less and unit of speed is m/s.

Only unit of wavelength is meter. Thus woman turns wavelength of station.

## Question 79

### Question

MCQ▾

Thumb is placed on bicycle outlet. If air is pulled in what change will occur to pressure and volume?

What happens to the pressure and to the volume of the trapped air as the pump handle is pulled in?

### Choices

Choice (4)

a.

Pressure increases, volume remains the same

b.

Pressure increases, volume decreases

c.

Pressure decreases, volume remains the same

d.

Pressure decreases, volume decreases