GENERAL SCIENCE CLASS 8 MCQS

When blue litmus paper dipped acids, its colour change to:

1. Pink
2. Blue
3. Yellow
4. Red

When red litmus paper dipped basic, its colour change to:

1. Blue
2. Pink
3. Red
4. Dark

The pH scale is a measure of the acidity or alkalinity of a solution, and it ranges between:

1. 1 - 10
2. 1 - 14
3. 5 - 15
4. 0 - 12

Which best describes milk:

1. Slightly Acidic
2. Slightly Basic
3. Strongly Acidic
4. Strongly Basic

Which lists the substances from least to most acidic:

1. Blood, milk, ammonia, orange juice
2. Blood, ammonia, milk, orange juice
3. Milk, blood, orange juice, ammonia
4. Ammonia, blood, milk, orange juice

Which substance has a pH value closest to neutral:

1. Ammonia
2. Blood
3. Milk
4. Organic juice

Which substance is the most alkaline:

1. Milk
2. Blood
3. Ammonia
4. Organic juice

In an acidic medium, phenolphthalein is colourless and in a basic medium, it is:

1. Green
2. Blue
3. Yellow
4. Pink

In an acidic medium, bromophenol blue is yellow and in a basic medium, it is:

1. Blue
2. Pink
3. Red
4. Yellow

In an acidic medium, methyl orange is orange (red) and in a basic medium, it is:

1. Red
2. Yellow
3. Pink
4. Blue