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1/10 Questions

The percentage of oxygen present in the air is 21 percent.
- Right
- Wrong

About This Quiz

This is a basic science test, with different scientific questions designed for 1st grade science students. Take this science test and determine how well informed are you about science, all the best for the following test, make sure you answer all questions carefully.

2.

Oxygen can be identified by
- Passing it through lime water
- Using a glowing wooden splinter
- Putting a moist blue litmus paper into it
- Passing it through bicarbonate indicator
Correct Answer

A. Using a glowing wooden splinter

Explanation

A glowing wooden splinter is used to identify oxygen because oxygen supports combustion. When a wooden splinter is brought near oxygen, it ignites and continues to burn brightly. This is due to the fact that oxygen is a highly reactive gas that readily supports the combustion process. Therefore, by observing if a wooden splinter ignites or not, we can determine the presence of oxygen.

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3.

During photosynthesis green plants give out
- Oxygen
- Nitrogen
- Hydrogen
- Carbon dioxide
Correct Answer

A. Oxygen

Explanation

During photosynthesis, green plants use sunlight, water, and carbon dioxide to produce glucose (a form of sugar) and oxygen. The oxygen is released into the atmosphere as a byproduct of the process. This oxygen is essential for the survival of many organisms, including humans, as it is needed for respiration. Therefore, the correct answer is oxygen.

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6
4.

Which of the following is not an effect on air pollution
- Skin cancer
- Low visibility
- Breathing dificulties
- Stronger immunity system
Correct Answer

A. Stronger immunity system

Explanation

The correct answer is "stronger immunity system" because air pollution does not have a positive effect on the immune system. In fact, air pollution can weaken the immune system and make individuals more susceptible to respiratory infections and diseases.

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9
5.

The energy that occurs in an electric kettle is
- Electric ->heat
- Potential->kinetic
- Electric->kinetic
- Chemical->electrical
Correct Answer

A. Electric ->heat

Explanation

The correct answer is electric -> heat because an electric kettle converts electrical energy into heat energy to boil water.

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8
6.

The energy that makes water evaporate and form clouds is
- Heat energy
- Sound energy
- Nuclear energy
- Hydroelectrical energy
Correct Answer

A. Heat energy

Explanation

The energy that causes water to evaporate and form clouds is heat energy. Heat energy increases the temperature of water, causing the water molecules to gain energy and become more active. As a result, some of the water molecules at the surface gain enough energy to break the bonds holding them together and escape into the air as water vapor. These water vapor molecules then rise and cool, forming clouds. Therefore, heat energy is responsible for the process of evaporation and cloud formation.

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3
7.

Lime water turns cloudy in the presents of ________

Correct Answer
carbon dioxide

Explanation
When carbon dioxide gas is added to lime water, a chemical reaction occurs. This reaction forms calcium carbonate, which is insoluble and appears as a cloudy precipitate in the solution. Therefore, the presence of carbon dioxide causes lime water to turn cloudy.

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11
8.

_______ignites a glowing wooden splinter

Correct Answer
oxygen

Explanation
Oxygen is the correct answer because it is a highly reactive gas that supports combustion. When a wooden splinter is exposed to oxygen, it reacts with the oxygen molecules in the air, resulting in a chemical reaction known as combustion. This reaction releases energy in the form of heat and light, causing the wooden splinter to glow. Therefore, oxygen is responsible for igniting the glowing wooden splinter.

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6
9.

Carbon dioxide is an ________gas

Correct Answer
acidic

Explanation
Carbon dioxide is an acidic gas because when it dissolves in water, it forms carbonic acid (H2CO3). This acid can release hydrogen ions (H+) into the solution, making it acidic. Carbon dioxide is also known to lower the pH of water when dissolved, which further supports its acidic nature.

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3
10.

Oxygen is a ___.

Correct Answer
Chemical element, gas

Explanation
Oxygen is considered a chemical element because it is a pure substance that cannot be broken down into simpler substances by chemical means. It is also a gas at room temperature and normal atmospheric pressure, making it a gas.

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0

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Feb 28, 2025

Quiz Edited by
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Aug 12, 2009

Quiz Created by
Love Struck

Science Test Form

The percentage of oxygen present in the air is 21 percent.

Quiz Preview

Oxygen can be identified by

During photosynthesis green plants give out

Which of the following is not an effect on air pollution

The energy that occurs in an electric kettle is

The energy that makes water evaporate and form clouds is

Lime water turns cloudy in the presents of ________

_______ignites a glowing wooden splinter

Carbon dioxide is an ________gas

Oxygen is a ___.