# IGCSE Physics Paper-1: Specimen Questions with Answers 139 - 142 of 149

## Question 139

### Question

MCQ▾

What are the correct units for the mass and amount of substance?

Choice (4)

a.

b.

c.

d.

d.

### Explanation

• The amount of substance is the number of discrete atomic-scale particles to divide with the Avogadro constant.
• S. I Unit for the amount of substance is Mole (mol)
• S. I Unit for the mass is Kilogram (kg) .
• These are international system of units which are accepted universally.

## Question 140

### Question

MCQ▾

If the temperature of a 10 kg of mass of material of specific heat capacity 200 J rises from to , what would be the Heat received?

Choice (4)

a.

3000 J

b.

1000 J

c.

1500 J

d.

2000 J

b.

i.e.

## Question 141

### Question

MCQ▾

From the table what is the movement of particles in solid gases and liquids?

### Choices

Choice (4)

a.

b.

MoverapidlyCannotmoveMove

c.

d.

a.

### Explanation

• Particles in a solid cannot move but they can vibrate because solid particles are tightly packed together.
• Particles in liquids are close together but still the move.
• Particles in a gas move very rapidly.

## Question 142

### Question

MCQ▾

What is the pressure on a surface when a force of 48 N acts on area of 6 m2?

Choice (4)

a.

6 Pa

b.

5 Pa

c.

8 Pa

d.

12 Pa

c.

### Explanation

Pressure is defined as force per unit area.

The unit of pressure is Pascal.

Pressure = =

• P =
• P = 8 pa

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