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Daily Quiz: November 29, 2018
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- Question 1 of 7
1. Question
1 pointsCategory: Science and Technology- Which of the following is/are the example(s) of chemical change?
- Using a chemical battery
- Baking a cake
- Rotting of bananas
Select the correct answer using the code given below.
Correct
All are example of chemical change.
Chemical changes involve chemical reactions and the creation of new products. Typically, a chemical change is irreversible.
In contrast, physical changes do not form new products and are reversible. Examples of physical change include: change of state, creation or separation of a mixture, physical deformation such as cutting, change in color by addition of dye.
Following are the few examples of chemical change:
Rusting of iron
Combustion (burning) of wood
Metabolism of food in the body
Mixing an acid and a base, such as hydrochloric acid (HCl) and sodium hydroxide (NaOH)
Cooking an egg
Digesting sugar with the amylase in saliva
Mixing baking soda and vinegar to produce carbon dioxide gas
Baking a cake
Electroplating a metal
Using a chemical battery
Explosion of fireworks
Rotting of bananas
Grilling a hamburger
Souring of Milk
Incorrect
All are example of chemical change.
Chemical changes involve chemical reactions and the creation of new products. Typically, a chemical change is irreversible.
In contrast, physical changes do not form new products and are reversible. Examples of physical change include: change of state, creation or separation of a mixture, physical deformation such as cutting, change in color by addition of dye.
Following are the few examples of chemical change:
Rusting of iron
Combustion (burning) of wood
Metabolism of food in the body
Mixing an acid and a base, such as hydrochloric acid (HCl) and sodium hydroxide (NaOH)
Cooking an egg
Digesting sugar with the amylase in saliva
Mixing baking soda and vinegar to produce carbon dioxide gas
Baking a cake
Electroplating a metal
Using a chemical battery
Explosion of fireworks
Rotting of bananas
Grilling a hamburger
Souring of Milk
- Question 2 of 7
2. Question
1 pointsCategory: Science and TechnologyThe working principle of a washing machine is :
Correct
Centrifugation is the process of separating substances of different densities by the use of a centrifugal force. It is used in washing machines to separate water particles from clothes while drying in washing machines. More dense components of the mixture migrate away from the axis of the centrifuge whereas lens dense components of the mixture migrate or move towards the axis
Incorrect
Centrifugation is the process of separating substances of different densities by the use of a centrifugal force. It is used in washing machines to separate water particles from clothes while drying in washing machines. More dense components of the mixture migrate away from the axis of the centrifuge whereas lens dense components of the mixture migrate or move towards the axis
- Question 3 of 7
3. Question
1 pointsCategory: Science and Technology- Which one among the following was the first to legalize euthanasia?
Correct
Netherlands was the first Country to legalize euthanasia in 2002.
Incorrect
Netherlands was the first Country to legalize euthanasia in 2002.
- Question 4 of 7
4. Question
1 pointsCategory: Science and Technology- which one of the following has the highest fuel value ?
Correct
The fuel value is defined as the amount of heat produced in calories or joules when one gram of a substance (fuel) is completely burnt.
Fuel Calorific Value (KJ/g)
Hydrogen 150
Natural gas 55
Gasoline 45
Charcoal 30
Incorrect
The fuel value is defined as the amount of heat produced in calories or joules when one gram of a substance (fuel) is completely burnt.
Fuel Calorific Value (KJ/g)
Hydrogen 150
Natural gas 55
Gasoline 45
Charcoal 30
- Question 5 of 7
5. Question
1 pointsCategory: Science and TechnologyConsider the following statements:
1. molasses is a by-product of sugar production process,
- 2. bagasse obtained in the sugar mills is used as a fuel in the boiler to generate steam for the sugar factories
- 3. sugar can only be produced from sugarcane as the raw material.
Which of these statement are correct ?
Correct
Statement 3 is incorrect, sugar can be produced from Sugar Beet also. Sugarbeet is the major contributor for world’s sugar production than sugarcane. Brazil produces sugar from beet sugar.
Incorrect
Statement 3 is incorrect, sugar can be produced from Sugar Beet also. Sugarbeet is the major contributor for world’s sugar production than sugarcane. Brazil produces sugar from beet sugar.
- Question 6 of 7
6. Question
1 pointsCategory: Science and TechnologyThe major component of honey is
Correct
Fructose (38.19) ,the sweetest sugar, is the major component of honey other constituents are Dextrose (21-28%) ,maltose (8.81%) ,pigment (2.21%) Ash(1%) ,water(7.2%)
Incorrect
Fructose (38.19) ,the sweetest sugar, is the major component of honey other constituents are Dextrose (21-28%) ,maltose (8.81%) ,pigment (2.21%) Ash(1%) ,water(7.2%)
- Question 7 of 7
7. Question
1 pointsCategory: Science and TechnologyThe genetic engineering approval committee, whose permission is required for cultivation of any genetically modified crop in India, is under the union ministry of
Correct
The genetic engineering approval committee (GEAC) is under the ministry of environment and forests.
Incorrect
The genetic engineering approval committee (GEAC) is under the ministry of environment and forests.
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