IGCSE Physics Paper-1: Specimen Questions with Answers 122 - 125 of 149

The circuit diagram contains a resistor.

What is the resistance of the resistor?

Answer

c.

Explanation

Resistors are used in circuit to control the potential difference (p. d) .

V = IR

R =

=

The required resistance of the resistor is

The diagram shows some liquid in a measuring cylinder. The mass of the liquid is 20g. What is density of the liquid?

Answer

c.

Explanation

• Density =

• From the diagram the volume of the liquid is

• Mass of the liquid = 20g

• Density = = g/

Which of the following is a S. I unit of pressure?

Answer

a.

Explanation

• The S. I unit for pressure is Pascal (pa) which is equal to the N/m²

• Hertz is the unit of Frequency

• Ampere is a unit of current.

• Meters are the units of measurements.

A person clapped his hands near a building and heard echo after 10s. What is the distance of the building from the person if the speed of the sound is taken as 230 m/s?

Answer

d.

Explanation

• The time taken for echo to be heard t = 10s

• Seed of sound (u) = 230m/s

• Distance travelled by the sound (d)

• d is the distance between person to building and building to the person.

• Distance of the building to the person =