Welcome to your Science Quiz 28
1.
With reference to ‘fuel cells’ in which hydrogen-rich fuel and oxygen are used to generate electricity, consider the following statements:
- If pure hydrogen is used as a fuel, the fuel cell emits heat and water as by-products.
- Fuel cells can be used for powering buildings and not for small devices like laptop computers.
- Fuel cells produce electricity in the form of Alternating Current (AC).
Which of the statements given above is / are correct?
2.
Which of the following is/are the example/examples of chemical change?
- Crystallization of sodium chloride
- Melting of ice
- Souring of milk
Select the correct answer using the code given below.
3.
Fruits stored in cold chamber exhibit long storage life because ___:
4.
What is the role of ultraviolet (UV) radiation in the water purification systems?
- It inactivates/kills the harmful microorganisms in water.
- It removes all the undesirable odours from the water.
- It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water.
Which of the statements given above is/are correct?
5.
Aspartame is an artificial sweetener sold in the market. It consists of amino acids and provides calories like other amino acids. Yet, it is used as a low-calorie sweetening agent in food items. What is the basis of this use?
6.
Excessive release of the pollutant carbon monoxide (CO), into the air may produce a condition in which oxygen supply in the human body decreases. What causes this condition?
7.
Consider the following:
- Oxides of Hydrogen.
- Oxides of Nitrogen.
- Oxides of Sulphur.
Which of the above is/are the emission/emissions from coal combustion at thermal power plants?
8.
Hydrogen fuel cell vehicles produce one of the following as “exhaust”:
9.
Chlorination is a process used for water purification. The disinfecting action of chlorine is mainly due to:
10.
In a dry cell (battery), which of the following are used as electrolytes?
