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The following Test is based on the syllabus of 60 Days Plan-2023 for UPSC IAS Prelims 2022.
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The compound used in black and white photography is?
Solution (a)
Silver bromide (AgBr) is a soft, pale-yellow, water-insoluble salt well known (along with other silver halides) for its unusual sensitivity to light. This property has allowed silver halides to become the basis of modern photographic materials. AgBr is widely used in photographic film.
Solution (a)
Silver bromide (AgBr) is a soft, pale-yellow, water-insoluble salt well known (along with other silver halides) for its unusual sensitivity to light. This property has allowed silver halides to become the basis of modern photographic materials. AgBr is widely used in photographic film.
Bisphenol A (BPA), a cause of concern, is a structural/key component in the manufacture of which of the following kinds of plastics?
Solution (a)
Bisphenol A (BPA) is a chemical compound primarily used in the manufacturing of various plastics. It is a colourless solid which is soluble in most common organic solvents, but has very poor solubility in water.
BPA’s largest single application is as a co-monomer in the production of polycarbonates, which accounts for 65-70% of all BPA production.
Solution (a)
Bisphenol A (BPA) is a chemical compound primarily used in the manufacturing of various plastics. It is a colourless solid which is soluble in most common organic solvents, but has very poor solubility in water.
BPA’s largest single application is as a co-monomer in the production of polycarbonates, which accounts for 65-70% of all BPA production.
Which one among the following is a chemical process?
Solution (c)
All the given processes are physical processes except production of iodine from seaweeds.
Solution (c)
All the given processes are physical processes except production of iodine from seaweeds.
With respect to Ethylene Glycol, consider the following statements:
How many of the above statements are correct?
Solution (c)
Ethylene Glycol, also called ethane-1,2-diol, the simplest member of the glycol family of organic compounds.
Solution (c)
Ethylene Glycol, also called ethane-1,2-diol, the simplest member of the glycol family of organic compounds.
Consider the following statements with respect to ‘Alloys’:
Which of the statement/s given above is/are correct?
Solution (d)
Statement 1 | Statement 2 |
Incorrect | Incorrect |
Alloys are mixtures of two or more metals or a metal and a non-metal. For example, brass is a mixture of approximately 30% zinc and
70% copper. |
They cannot be separated into their components by physical methods. But still, an alloy is considered as a mixture because it shows the properties of its constituents and can have variable composition. |
Solution (d)
Statement 1 | Statement 2 |
Incorrect | Incorrect |
Alloys are mixtures of two or more metals or a metal and a non-metal. For example, brass is a mixture of approximately 30% zinc and
70% copper. |
They cannot be separated into their components by physical methods. But still, an alloy is considered as a mixture because it shows the properties of its constituents and can have variable composition. |
Consider the following statements with reference to properties of a colloid:
How many of the above statements are correct?
Solution (a)
Statement 1 | Statement 2 | Statement 3 |
Incorrect | Incorrect | Correct |
The particles of a colloid are uniformly spread throughout the solution. Due to the relatively smaller size of particles, as compared to that of a suspension, the mixture appears to be homogeneous. But actually, a colloidal solution is a heterogeneous mixture, for example, milk. | Because of the small size of colloidal particles, we cannot see them with naked eyes. But these particles can easily scatter a beam of visible light. Thus, the size of particles of a colloid is too small to be individually seen by naked eyes.
|
They do not settle down when left undisturbed, that is, a colloid is quite stable. They cannot be separated from the mixture by the process of filtration. But, a special technique of separation known as centrifugation, can be used to separate the colloidal particles. |
Solution (a)
Statement 1 | Statement 2 | Statement 3 |
Incorrect | Incorrect | Correct |
The particles of a colloid are uniformly spread throughout the solution. Due to the relatively smaller size of particles, as compared to that of a suspension, the mixture appears to be homogeneous. But actually, a colloidal solution is a heterogeneous mixture, for example, milk. | Because of the small size of colloidal particles, we cannot see them with naked eyes. But these particles can easily scatter a beam of visible light. Thus, the size of particles of a colloid is too small to be individually seen by naked eyes.
|
They do not settle down when left undisturbed, that is, a colloid is quite stable. They cannot be separated from the mixture by the process of filtration. But, a special technique of separation known as centrifugation, can be used to separate the colloidal particles. |
What do you understand by the term ‘Chromatography’?
Solution (b)
Statement 1 | Statement 2 | Statement 3 | Statement 4 |
Incorrect | Correct | Incorrect | Incorrect |
Spectroscopy is the study of the absorption and emission of light and other radiation by matter. It involves the splitting of light (or more precisely electromagnetic radiation) into its constituent wavelengths (a spectrum), which is done in much the same way as a prism splits light into a rainbow of colours. | In chemical analysis, chromatography is a laboratory technique for the separation of a mixture into its components. The mixture is dissolved in a fluid solvent called the mobile phase, which carries it through a system on which a material called the stationary phase is fixed. | Chemical reaction is a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products. | Electromagnetism is a branch of physics involving the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles. The electromagnetic force is carried by electromagnetic fields composed of electric fields and magnetic fields, and it is responsible for electromagnetic radiation such as light. |
Solution (b)
Statement 1 | Statement 2 | Statement 3 | Statement 4 |
Incorrect | Correct | Incorrect | Incorrect |
Spectroscopy is the study of the absorption and emission of light and other radiation by matter. It involves the splitting of light (or more precisely electromagnetic radiation) into its constituent wavelengths (a spectrum), which is done in much the same way as a prism splits light into a rainbow of colours. | In chemical analysis, chromatography is a laboratory technique for the separation of a mixture into its components. The mixture is dissolved in a fluid solvent called the mobile phase, which carries it through a system on which a material called the stationary phase is fixed. | Chemical reaction is a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products. | Electromagnetism is a branch of physics involving the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles. The electromagnetic force is carried by electromagnetic fields composed of electric fields and magnetic fields, and it is responsible for electromagnetic radiation such as light. |
It was known by 1900 that the atom was indivisible particle but contained at least one sub-atomic particle i.e., the electron. This was identified by?
Solution (a)
Statement 1 | Statement 2 | Statement 3 | Statement 4 |
Correct | Incorrect | Incorrect | Incorrect |
J.J. Thomson (1856-1940), a British physicist, was born in Cheetham Hill, a suburb of Manchester, on 18 December 1856. He was awarded the Nobel prize in Physics in 1906 for his work on the discovery of electrons. He directed the Cavendish Laboratory at Cambridge for 35 years and 7 of his research assistants subsequently won Nobel prizes. | Eugen Goldstein was a German physicist. He was an early investigator of discharge tubes, the discoverer of anode rays or canal rays, later identified as positive ions in the gas phase including the hydrogen ion. These are positively charged ions that are accelerated toward and through a perforated cathode in an evacuated tube. | Ernest Rutherford was a New Zealand physicist who came to be known as the father of nuclear physics. Encyclopedia Britannica considers him to be the greatest experimentalist since Michael Faraday. He discovered the nucleus of the atom in 1911. | John Dalton FRS was an English chemist, physicist and meteorologist. He is best known for introducing the atomic theory into chemistry, and for his research into colour blindness, sometimes referred to as Daltonism in his honour. |
Solution (a)
Statement 1 | Statement 2 | Statement 3 | Statement 4 |
Correct | Incorrect | Incorrect | Incorrect |
J.J. Thomson (1856-1940), a British physicist, was born in Cheetham Hill, a suburb of Manchester, on 18 December 1856. He was awarded the Nobel prize in Physics in 1906 for his work on the discovery of electrons. He directed the Cavendish Laboratory at Cambridge for 35 years and 7 of his research assistants subsequently won Nobel prizes. | Eugen Goldstein was a German physicist. He was an early investigator of discharge tubes, the discoverer of anode rays or canal rays, later identified as positive ions in the gas phase including the hydrogen ion. These are positively charged ions that are accelerated toward and through a perforated cathode in an evacuated tube. | Ernest Rutherford was a New Zealand physicist who came to be known as the father of nuclear physics. Encyclopedia Britannica considers him to be the greatest experimentalist since Michael Faraday. He discovered the nucleus of the atom in 1911. | John Dalton FRS was an English chemist, physicist and meteorologist. He is best known for introducing the atomic theory into chemistry, and for his research into colour blindness, sometimes referred to as Daltonism in his honour. |
Steel is an alloy of?
Solution (c)
Steel is an alloy made up of iron with typically a few tenths of a percent of carbon to improve its strength and fracture resistance compared to other forms of iron.
Solution (c)
Steel is an alloy made up of iron with typically a few tenths of a percent of carbon to improve its strength and fracture resistance compared to other forms of iron.
With reference to the Acids and its sources in our daily life, select the correct pair:
Name of acid Material found in
Select the answer:
Solution (d)
Statement 1 | Statement 2 | Statement 3 |
Correct | Incorrect | Correct |
Acetic acid, systematically named ethanoic acid, is an acidic, colourless liquid and organic compound with the chemical formula CH₃COOH. Vinegar is at least 4% acetic acid by volume, making acetic acid the main component of vinegar apart from water and other trace elements. | Formic acid is the simplest carboxylic acid, containing a single carbon. Occurs naturally in various sources including the venom of bee and ant stings, and is a useful organic synthetic reagent. Principally used as a preservative and antibacterial agent in livestock feed. | Oxalic acid is an organic compound found in many plants, including leafy greens, vegetables, fruits, cocoa, nuts, seeds and spinach. In plants, it’s usually bound to minerals, forming oxalate. The terms “oxalic acid” and “oxalate” are used interchangeably in nutrition science. |
Solution (d)
Statement 1 | Statement 2 | Statement 3 |
Correct | Incorrect | Correct |
Acetic acid, systematically named ethanoic acid, is an acidic, colourless liquid and organic compound with the chemical formula CH₃COOH. Vinegar is at least 4% acetic acid by volume, making acetic acid the main component of vinegar apart from water and other trace elements. | Formic acid is the simplest carboxylic acid, containing a single carbon. Occurs naturally in various sources including the venom of bee and ant stings, and is a useful organic synthetic reagent. Principally used as a preservative and antibacterial agent in livestock feed. | Oxalic acid is an organic compound found in many plants, including leafy greens, vegetables, fruits, cocoa, nuts, seeds and spinach. In plants, it’s usually bound to minerals, forming oxalate. The terms “oxalic acid” and “oxalate” are used interchangeably in nutrition science. |
Turmeric stains on the shirt turn red when washed with soap because?
Solution (b)
Turmeric stains on the shirt turn red when washed with soap because the soap solution is basic in nature which changes the yellow colour of Turmeric into red colour. It is because turmeric contains tartaric acid, while the soap contains a sodium hydroxide base.
Solution (b)
Turmeric stains on the shirt turn red when washed with soap because the soap solution is basic in nature which changes the yellow colour of Turmeric into red colour. It is because turmeric contains tartaric acid, while the soap contains a sodium hydroxide base.
With reference to classification of ‘Carbohydrates’, consider the following statements:
From the above given statements, identify the incorrect one/s:
Solution (c)
Statement 1 | Statement 2 |
Incorrect | Incorrect |
A carbohydrate that cannot be hydrolysed further to give simpler unit of polyhydroxy aldehyde or ketone is called a monosaccharide. Carbohydrates that yield two to ten monosaccharide units, on hydrolysis, are called oligosaccharides. | Carbohydrates which yield a large number of monosaccharide units on hydrolysis are called polysaccharides. Some common examples are starch, cellulose, glycogen, gums, etc. Polysaccharides are not sweet in taste, hence they are also called non-sugars. |
Solution (c)
Statement 1 | Statement 2 |
Incorrect | Incorrect |
A carbohydrate that cannot be hydrolysed further to give simpler unit of polyhydroxy aldehyde or ketone is called a monosaccharide. Carbohydrates that yield two to ten monosaccharide units, on hydrolysis, are called oligosaccharides. | Carbohydrates which yield a large number of monosaccharide units on hydrolysis are called polysaccharides. Some common examples are starch, cellulose, glycogen, gums, etc. Polysaccharides are not sweet in taste, hence they are also called non-sugars. |
Consider the following statements:
How many of the above statements are correct?
Solution (c)
Statement 1 | Statement 2 | Statement 3 |
Correct | Correct | Correct |
Aqua regia, (Latin for ‘royal water’) is a freshly prepared mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio of 3:1. Aqua regia is a highly corrosive, fuming liquid. | It can dissolve gold, even though neither of these acids can do so alone. It is one of the few reagents that is able to dissolve gold and platinum. | Aqua regia is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regia is a fuming liquid.
Hydrogen gas is not evolved when a metal reacts with nitric acid. It is because HNO3 is a strong oxidising agent. It oxidises the H2 produced to water and itself gets reduced to any of the nitrogen oxides (N2O, NO, NO2). But magnesium (Mg) and manganese (Mn) react with very dilute HNO3 to evolve H2 gas. |
Solution (c)
Statement 1 | Statement 2 | Statement 3 |
Correct | Correct | Correct |
Aqua regia, (Latin for ‘royal water’) is a freshly prepared mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio of 3:1. Aqua regia is a highly corrosive, fuming liquid. | It can dissolve gold, even though neither of these acids can do so alone. It is one of the few reagents that is able to dissolve gold and platinum. | Aqua regia is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regia is a fuming liquid.
Hydrogen gas is not evolved when a metal reacts with nitric acid. It is because HNO3 is a strong oxidising agent. It oxidises the H2 produced to water and itself gets reduced to any of the nitrogen oxides (N2O, NO, NO2). But magnesium (Mg) and manganese (Mn) react with very dilute HNO3 to evolve H2 gas. |
Consider the following statements:
Which of the given statement/s is/are correct?
Solution (b)
Statement 1 | Statement 2 |
Incorrect | Correct |
The baking soda is commonly used in the kitchen for making tasty crispy pakoras, etc. Sometimes it is added for faster cooking. The chemical name of the compound is sodium hydrogencarbonate (NaHCO3). It is produced using sodium chloride as one of the raw materials. Sodium Chloride (NaCl) is an ingredient in common salt. | For making baking powder, which is a mixture of baking soda (sodium hydrogencarbonate) and a mild edible acid such as tartaric acid. When baking powder is heated or mixed in water, the following reaction takes place –
NaHCO3 + H+ = CO2 + H2O + Sodium salt of acid Carbon dioxide produced during the reaction can cause bread or cake to rise making them soft and spongy. |
Solution (b)
Statement 1 | Statement 2 |
Incorrect | Correct |
The baking soda is commonly used in the kitchen for making tasty crispy pakoras, etc. Sometimes it is added for faster cooking. The chemical name of the compound is sodium hydrogencarbonate (NaHCO3). It is produced using sodium chloride as one of the raw materials. Sodium Chloride (NaCl) is an ingredient in common salt. | For making baking powder, which is a mixture of baking soda (sodium hydrogencarbonate) and a mild edible acid such as tartaric acid. When baking powder is heated or mixed in water, the following reaction takes place –
NaHCO3 + H+ = CO2 + H2O + Sodium salt of acid Carbon dioxide produced during the reaction can cause bread or cake to rise making them soft and spongy. |
The p in pH stands for ‘potenz’ in German, meaning power. In this regard, consider the following statements with reference to ‘pH’:
How many of the above statements are correct?
Solution (c)
Statement 1 | Statement 2 | Statement 3 |
Correct | Correct | Correct |
The pH of our stomach varies, but its natural state is between 1.5 and 3.5. This level rises when food enters the stomach; it can reach up to six, but it lowers again throughout digestion as stomach acid is secreted. It is very interesting to note that our stomach produces hydrochloric acid. It helps in the digestion of food without harming the stomach. | Tooth decay starts when the pH of the mouth is lower than 5.5. Tooth enamel, made up of calcium hydroxyapatite (a crystalline form of calcium phosphate) is the hardest substance in the body. It does not dissolve in water, but is corroded when the pH in the mouth is below 5.5. Bacteria present in the mouth produce acids by degradation of sugar and food particles remaining in the mouth after eating. | Human body works within the pH range of 7.0 to 7.8. Living organisms can survive only in a narrow range of pH change. When pH of rain water is less than 5.6, it is called acid rain. When acid rain flows into the rivers, it lowers the pH of the river water. The survival of aquatic life in such rivers becomes difficult. |
Solution (c)
Statement 1 | Statement 2 | Statement 3 |
Correct | Correct | Correct |
The pH of our stomach varies, but its natural state is between 1.5 and 3.5. This level rises when food enters the stomach; it can reach up to six, but it lowers again throughout digestion as stomach acid is secreted. It is very interesting to note that our stomach produces hydrochloric acid. It helps in the digestion of food without harming the stomach. | Tooth decay starts when the pH of the mouth is lower than 5.5. Tooth enamel, made up of calcium hydroxyapatite (a crystalline form of calcium phosphate) is the hardest substance in the body. It does not dissolve in water, but is corroded when the pH in the mouth is below 5.5. Bacteria present in the mouth produce acids by degradation of sugar and food particles remaining in the mouth after eating. | Human body works within the pH range of 7.0 to 7.8. Living organisms can survive only in a narrow range of pH change. When pH of rain water is less than 5.6, it is called acid rain. When acid rain flows into the rivers, it lowers the pH of the river water. The survival of aquatic life in such rivers becomes difficult. |
Consider the following statements:
How many of the above statements are correct?
Solution (c)
Statement 1 | Statement 2 | Statement 3 |
Correct | Correct | Correct |
The crystalline forms of carbon are diamond, graphite and fullerene. | Crystallization is the process by which a solid form, where the atoms or molecules are highly organized into a structure known as a crystal.
Crystallization is a technique which chemists use to purify solid compounds. |
Crystallization is based on the principles of solubility: compounds (solutes) tend to be more soluble in hot liquids (solvents) than they are in cold liquids.
If a saturated hot solution is allowed to cool, the solute is no longer soluble in the solvent and forms crystals of pure compound.
Impurities are excluded from the growing crystals and the pure solid crystals can be separated from the dissolved impurities by filtration.
|
Solution (c)
Statement 1 | Statement 2 | Statement 3 |
Correct | Correct | Correct |
The crystalline forms of carbon are diamond, graphite and fullerene. | Crystallization is the process by which a solid form, where the atoms or molecules are highly organized into a structure known as a crystal.
Crystallization is a technique which chemists use to purify solid compounds. |
Crystallization is based on the principles of solubility: compounds (solutes) tend to be more soluble in hot liquids (solvents) than they are in cold liquids.
If a saturated hot solution is allowed to cool, the solute is no longer soluble in the solvent and forms crystals of pure compound.
Impurities are excluded from the growing crystals and the pure solid crystals can be separated from the dissolved impurities by filtration.
|
Which one of the following is not a semiconductor?
Solution (c)
A semiconductor material has an electrical conductivity value falling between that of a conductor, such as metallic copper, and an insulator, such as glass. Its resistivity falls as its temperature rises; metals behave in the opposite way.
Some examples of semiconductors are silicon, germanium and gallium arsenide.
After silicon, gallium arsenide is the second-most common semiconductor and is used in laser diodes, solar cells, microwave-frequency integrated circuits, and others. Silicon is a critical element for fabricating most electronic circuits.
Solution (c)
A semiconductor material has an electrical conductivity value falling between that of a conductor, such as metallic copper, and an insulator, such as glass. Its resistivity falls as its temperature rises; metals behave in the opposite way.
Some examples of semiconductors are silicon, germanium and gallium arsenide.
After silicon, gallium arsenide is the second-most common semiconductor and is used in laser diodes, solar cells, microwave-frequency integrated circuits, and others. Silicon is a critical element for fabricating most electronic circuits.
Which one of the following polymers is widely used for making bullet proof material?
Solution (a)
Polycarbonates (PC) are a group of thermoplastic polymers containing carbonate groups in their chemical structures. Polycarbonates used in engineering are strong, tough materials, and some grades are optically transparent.
Much of the bullet-proof and shatter-proof glass that you see and experience in real life is actually made of bullet-resistant polycarbonate sheets.
Solution (a)
Polycarbonates (PC) are a group of thermoplastic polymers containing carbonate groups in their chemical structures. Polycarbonates used in engineering are strong, tough materials, and some grades are optically transparent.
Much of the bullet-proof and shatter-proof glass that you see and experience in real life is actually made of bullet-resistant polycarbonate sheets.
Magnetite is a mineral whose primary component is an:
Solution (a)
Solution (a)
Who of the following was the founder of the ‘Madras school’ of conformational analysis of biopolymers?
Solution (b)
G.N. Ramachandran, an outstanding figure in the field of protein structure, was the founder of the ‘Madras school’ of conformational analysis of biopolymers. His discovery of the triple helical structure of collagen in 1955 and his analysis of the allowed conformations of proteins through the use of the ‘Ramachandran plot’ ranks among the most outstanding contributions in structural biology.
Ramakrishnan Nagaraj (born 1953) is an Indian biochemist, molecular biologist and the leader of a team of scientists working in the field of peptide biochemistry at Centre for Cellular and Molecular Biology (CCMB). He is known for his studies on hemolytic and antibacterial properties in synthetic analogs of bacterial toxins.
Sálim Moizuddin Abdul Ali (12 November 1896 – 20 June 1987) was an Indian ornithologist and naturalist. Sometimes referred to as the “Birdman of India”, Salim Ali was the first Indian to conduct systematic bird surveys across India and wrote several bird books that popularized ornithology in India. He became a key figure behind the Bombay Natural History Society.
Chandrasekhara Venkata Raman won the Nobel Prize for Physics in 1930 for his pioneering work on scattering of light. Born in Tiruchirapalli on November 7, 1888, he was the first Asian and first non-White to receive any Nobel Prize in the sciences.
Solution (b)
G.N. Ramachandran, an outstanding figure in the field of protein structure, was the founder of the ‘Madras school’ of conformational analysis of biopolymers. His discovery of the triple helical structure of collagen in 1955 and his analysis of the allowed conformations of proteins through the use of the ‘Ramachandran plot’ ranks among the most outstanding contributions in structural biology.
Ramakrishnan Nagaraj (born 1953) is an Indian biochemist, molecular biologist and the leader of a team of scientists working in the field of peptide biochemistry at Centre for Cellular and Molecular Biology (CCMB). He is known for his studies on hemolytic and antibacterial properties in synthetic analogs of bacterial toxins.
Sálim Moizuddin Abdul Ali (12 November 1896 – 20 June 1987) was an Indian ornithologist and naturalist. Sometimes referred to as the “Birdman of India”, Salim Ali was the first Indian to conduct systematic bird surveys across India and wrote several bird books that popularized ornithology in India. He became a key figure behind the Bombay Natural History Society.
Chandrasekhara Venkata Raman won the Nobel Prize for Physics in 1930 for his pioneering work on scattering of light. Born in Tiruchirapalli on November 7, 1888, he was the first Asian and first non-White to receive any Nobel Prize in the sciences.
“Sagar Aankalan Guidelines” recently in the news is?
Solution (c)
Solution (c)
Consider the following statements regarding the Central Electricity Regulatory Commission (CERC):
How many of the above statements are correct?
Solution (d)
Solution (d)
Consider the following statements:
How many of the above statements are correct?
Solution (a)
Solution (a)
Consider the following statements regarding Papua New Guinea:
How many of the above statements are correct?
Solution (c)
Solution (c)
Consider the following statements regarding the Director General of Civil Aviation (DGCA):
How many of the above statements are correct?
Solution (c)
Solution (c)
Consider the following statements regarding the Melghat Tiger Reserve:
How many of the above statements are correct?
Solution (b)
Solution (b)
Consider the following statements:
How many of the above statements are correct?
Solution (a)
Solution (a)
Consider the following statements:
Choose the correct code:
Solution (b)
Note: A bitcoin halving is an event where the reward for mining new blocks is halved, meaning miners receive 50% fewer bitcoins for verifying transactions. Bitcoin halving is scheduled to occur once every 210,000 blocks – roughly every four years – until the maximum supply of 21 million bitcoins has been generated by the network.
Solution (b)
Note: A bitcoin halving is an event where the reward for mining new blocks is halved, meaning miners receive 50% fewer bitcoins for verifying transactions. Bitcoin halving is scheduled to occur once every 210,000 blocks – roughly every four years – until the maximum supply of 21 million bitcoins has been generated by the network.
Consider the following statements about Google DeepMind’s Genie:
Choose the correct code:
Solution (c)
Solution (c)
Consider the following statements about Uyghurs:
Choose the correct code:
Solution (a)
Solution (a)
At 5’O clock, clock ticks 5 times. The time between first and last tick was 36sec. How much time it takes at 11’O clock?
Solution (b)
At 5’o clock it ticks 5 times so there are total 4-time intervals.
Total time taken = 36 seconds
Hence, the time taken between any two consecutive ticks = 36/4 seconds = 9 seconds
Similarly, clock will tick 11 times at 11 o’ clock.
At 11o’clock there will be 10 intervals.
Hence total time needed at 11 o’clock = 10 × 9 = 90 seconds.
Solution (b)
At 5’o clock it ticks 5 times so there are total 4-time intervals.
Total time taken = 36 seconds
Hence, the time taken between any two consecutive ticks = 36/4 seconds = 9 seconds
Similarly, clock will tick 11 times at 11 o’ clock.
At 11o’clock there will be 10 intervals.
Hence total time needed at 11 o’clock = 10 × 9 = 90 seconds.
Out of the four annual examinations, each with a total of 200 marks, a student secured average marks of 45%, 50% and 55% in the first, second and third annual examinations. To have an overall average of 60%, how many marks does the student need to secure in the fourth annual examination?
Solution (c)
Let the average marks in the third Annual examination be x.
Total marks = (Marks in first + second + third + forth) Annual examination
4(60)( 200/100) = (45/100) (200) + ( 50/100) (200) + ( 55/100) (200) + ( x/100) (200)
4(60) = 45 + 50 +55 + x
x = 90
So, the student must score 90% in the fourth annual examination to secure 60% overall average.
∴ Average marks in the fourth annual examination (90/100) × 200 = 180 marks.
Solution (c)
Let the average marks in the third Annual examination be x.
Total marks = (Marks in first + second + third + forth) Annual examination
4(60)( 200/100) = (45/100) (200) + ( 50/100) (200) + ( 55/100) (200) + ( x/100) (200)
4(60) = 45 + 50 +55 + x
x = 90
So, the student must score 90% in the fourth annual examination to secure 60% overall average.
∴ Average marks in the fourth annual examination (90/100) × 200 = 180 marks.
The sum of 3 numbers is 85. If third number be one fifth of the first and the first number be twice the second, find the second number.
Solution (b)
From the details given in the question, the Ratio of the numbers = 1: 1/2: 1/5 = 10: 5: 2
Second number = 5/17 × 85 = 25.
Solution (b)
From the details given in the question, the Ratio of the numbers = 1: 1/2: 1/5 = 10: 5: 2
Second number = 5/17 × 85 = 25.
3ab0 is a four-digit number divisible by 25. If the number formed from the two digits ab is a multiple of 17, then ab
Solution (c)
We have given that the number 3ab0 is divisible by 25.
Any number divisible by 25 ends with the last two digits 00, 25, 50, or 75.
So, b0 should equal 00 or 50. Hence, b=0 or 5.
Since a is now free to take any digit from 0 through 9, ab can have multiple values.
We also have that ab is divisible by 17.
The multiples of 17 are 17, 34, 51, 68, 85, 102, 119, 136, 153 and 170.
Among these, the only number ending with 0 or 5 is 85.
Hence, ab=85
Solution (c)
We have given that the number 3ab0 is divisible by 25.
Any number divisible by 25 ends with the last two digits 00, 25, 50, or 75.
So, b0 should equal 00 or 50. Hence, b=0 or 5.
Since a is now free to take any digit from 0 through 9, ab can have multiple values.
We also have that ab is divisible by 17.
The multiples of 17 are 17, 34, 51, 68, 85, 102, 119, 136, 153 and 170.
Among these, the only number ending with 0 or 5 is 85.
Hence, ab=85
A 40 litre mixture of oil and water contains oil and water in the ratio 3 : 2. Now, 10 litres of the mixture is removed and replaced with pure oil. This operation is done one more time. What is the ratio of water and oil in the resultant mixture?
Solution (c)
Original quantity of oil and water is 24 litres and 16 litres.
Let the final quantity of water be a.
10 litres is being removed from 40 litres twice.
∴ a/16 = [1 – (10/40)]^2 = 9/16 ∴ a = 9
Hence, the final solution has 9 litres of water and 31 litres of oil.
∴ Required ratio = 9 : 31
Hence, option c.
Solution (c)
Original quantity of oil and water is 24 litres and 16 litres.
Let the final quantity of water be a.
10 litres is being removed from 40 litres twice.
∴ a/16 = [1 – (10/40)]^2 = 9/16 ∴ a = 9
Hence, the final solution has 9 litres of water and 31 litres of oil.
∴ Required ratio = 9 : 31
Hence, option c.
All the Best
IASbaba