Pariksha SaathiPedagogy
CTET Science MCQ with Answers, Paper 2
353 practice questions on Science and its Pedagogy (Paper II) for CTET Paper II (Mathematics and Science), with answers; most also have an explanation or a worked solution. Try each one before you open its answer.
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Q.51
An object vibrates and completes 1,500 oscillations in 30 seconds. What is the frequency of the vibration?
- A 0.02 Hz
- B 45,000 Hz
- C 50 Hz
- D 1,530 Hz
Show answer
Correct answer: (C) 50 Hz
Frequency is the number of oscillations per second: 1,500 / 30 = 50 oscillations per second, that is, 50 Hz. The value 0.02 is the time period in seconds, the reciprocal of the frequency.
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Q.52
Which pair of structures is found in plant cells but NOT in animal cells?
- A Cell wall and nucleus
- B Plastids and cell membrane
- C Cytoplasm and vacuole
- D Cell wall and plastids
Show answer
Correct answer: (D) Cell wall and plastids
Plant cells have a cell wall outside the cell membrane and plastids such as chloroplasts; animal cells have neither. The nucleus, cell membrane and cytoplasm are found in both, and vacuoles occur in both, though they are large in plant cells.
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Q.53
Consider the following statements about friction:
1. Friction always opposes the relative motion between two surfaces in contact.
2. Friction depends on how hard the two surfaces are pressed together.
Which of the statements given above is/are correct?
- A Only 1
- B Only 2
- C Both 1 and 2
- D Neither 1 nor 2
Show answer
Correct answer: (C) Both 1 and 2
Friction acts between surfaces in contact and opposes their relative motion. It also increases when the surfaces are pressed together harder, as when a mat is dragged with two people sitting on it instead of one.
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Q.54
The central part of a cyclone, called its 'eye', is:
- A The region with the strongest winds and heaviest rain
- B A region of very high air pressure
- C A calm region with light winds and few or no clouds
- D A tall wall of thick thunderclouds
Show answer
Correct answer: (C) A calm region with light winds and few or no clouds
The eye at the centre of a cyclone is a calm area of light winds and fair weather, largely free of clouds, and its surface pressure is the lowest in the whole storm. The strongest winds and heavy rain occur in the band of thick clouds around the eye.
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Q.55
Which scientist is credited with discovering, in 1820, that a compass needle is deflected when an electric current flows through a wire placed near it?
- A Thomas Alva Edison
- B Benjamin Franklin
- C Hans Christian Oersted
- D Isaac Newton
Show answer
Correct answer: (C) Hans Christian Oersted
In 1820 Hans Christian Oersted observed that a current-carrying wire deflects a nearby compass needle, showing that an electric current has a magnetic effect. Edison is known for his work on the electric bulb.
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Q.56
Consider the following statements about antibiotics:
1. Antibiotics are effective against cold and flu.
2. Antibiotics should be taken only on the advice of a qualified doctor.
3. Antibiotics taken when not needed may be less effective later, when they are really needed.
Which of the statements given above are correct?
- A 1 and 2 only
- B 2 and 3 only
- C 1 and 3 only
- D 1, 2 and 3
Show answer
Correct answer: (B) 2 and 3 only
Cold and flu are caused by viruses, against which antibiotics do not work, so statement 1 is wrong. Antibiotics should be taken only on a doctor's advice, and unnecessary use can make them less effective in the future.
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Q.57
Some birds fly thousands of kilometres to other regions every year at a particular time and return later. The main reason for this migration is that:
- A They can moult and grow new feathers only in warmer places
- B Their habitat turns very cold and inhospitable then
- C They are driven out by other birds of their own habitat
- D They look for birds of other species to mate with
Show answer
Correct answer: (B) Their habitat turns very cold and inhospitable then
Migratory birds fly to far-off areas every year at a particular time because of climatic changes: the weather in their natural habitat becomes very cold and inhospitable then. They return when conditions at home become suitable again.
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Q.58
Jute fibre is obtained from which part of the jute plant?
- A Seed
- B Stem
- C Fruit
- D Leaf
Show answer
Correct answer: (B) Stem
Jute fibre comes from the stem. The plant is usually harvested at the flowering stage, the stems are kept immersed in water for a few days so that they rot, and the fibres are then separated by hand.
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Q.59
During wastewater treatment, air is pumped into the clarified water. What is the purpose of this?
- A To make the water evaporate so that only the solid waste is left behind
- B To kill all the bacteria that are present in the water
- C To let aerobic bacteria grow and eat up the remaining waste
- D To dissolve the sludge again so that it can flow out easily
Show answer
Correct answer: (C) To let aerobic bacteria grow and eat up the remaining waste
Pumping air into the clarified water helps aerobic bacteria to grow; they consume the human waste, food waste, soaps and other unwanted matter still left in the water. Germs are killed later by disinfecting the water with chemicals such as chlorine and ozone.
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Q.60
Which of the following gives the correct sequence of the main steps of the project method?
- A Executing, planning, purposing, judging
- B Purposing, planning, executing, judging
- C Purposing, executing, planning, judging
- D Planning, purposing, judging, executing
Show answer
Correct answer: (B) Purposing, planning, executing, judging
In W.H. Kilpatrick's project method, learners first choose a purposeful project (purposing), then plan it, carry it out (executing) and finally evaluate it (judging). Many texts add 'providing a situation' at the start and 'recording' at the end.
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Q.61
Match List I with List II:
P. Inquiry training model
Q. Discovery learning
R. Advance organiser
S. Cone of experience
1. Edgar Dale
2. David Ausubel
3. Jerome Bruner
4. Richard Suchman
- A P-4, Q-2, R-3, S-1
- B P-3, Q-4, R-1, S-2
- C P-2, Q-3, R-4, S-1
- D P-4, Q-3, R-2, S-1
Show answer
Correct answer: (D) P-4, Q-3, R-2, S-1
Richard Suchman developed the inquiry training model, Jerome Bruner championed discovery learning, David Ausubel proposed the advance organiser for meaningful learning, and Edgar Dale gave the cone of experience for classifying learning experiences and aids.
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Q.62
Unlike other stars, the Pole Star does not appear to move across the night sky. This is because it:
- A Is the star that is nearest to the Earth
- B Is much brighter than all the other stars in the sky
- C Revolves around the Earth once every day
- D Lies almost along the Earth's axis of rotation
Show answer
Correct answer: (D) Lies almost along the Earth's axis of rotation
The Earth rotates about its axis, so stars seem to move from east to west. The Pole Star lies almost directly above the North Pole, along the axis, so it appears fixed; the nearest star to the Earth is in fact the Sun.
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Q.63
In a class activity, one group's result differs from those of all the other groups and from what the textbook says. The best response of the teacher is to:
- A Value the honest record and discuss what might have caused the difference
- B Ask the group to change its result so that it matches the one given in the textbook
- C Give the group fewer marks for getting a wrong result
- D Leave out that group's result when summarising the class findings
Show answer
Correct answer: (A) Value the honest record and discuss what might have caused the difference
Honest reporting of results, including unexpected ones, is a core value of science. Discussing possible causes, such as errors or different conditions, and retesting turns the difference into learning, while pressure to 'correct' data teaches dishonesty.
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Q.64
'Two students give different explanations of why an iron nail rusted. Using the observations in the table, judge which explanation is better supported and give reasons.' This question mainly assesses which level of the revised Bloom's taxonomy?
- A Evaluate
- B Remember
- C Apply
- D Understand
Show answer
Correct answer: (A) Evaluate
Evaluate involves making judgements based on criteria and evidence, such as deciding which explanation the data support. Recalling the conditions for rusting would be Remember, and explaining rusting in one's own words would be Understand.
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Q.65
The retina of the human eye has two kinds of light-sensitive cells. The cones are sensitive to:
- A The intensity of light, while the rods respond to colour
- B Sound, while the rods respond to light
- C Colour, while the rods respond to the intensity of light
- D Heat, while the rods respond to colour
Show answer
Correct answer: (C) Colour, while the rods respond to the intensity of light
Cones sense colour and work in bright light, while rods are sensitive to dim light but do not sense colour. This is why it is hard to tell colours apart in dim light.
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Q.66
The primary purpose of organising a science exhibition or science fair in an upper primary school is to:
- A Rank schools on the basis of exhibits
- B Develop creativity, innovation and scientific temper through self-made exhibits
- C Help students memorise the textbook for the examination
- D Award prizes to the best-dressed participants
Show answer
Correct answer: (B) Develop creativity, innovation and scientific temper through self-made exhibits
Science fairs give children a platform to apply science to real problems, build working models and communicate ideas, nurturing creativity, innovation and scientific attitude. Competition and prizes are incidental.
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Q.67
A concept is introduced in a simple form in a lower class and taken up again in greater depth and abstraction in higher classes. This way of organising science content is called the:
- A Project approach
- B Topical approach
- C Heuristic (learner as discoverer) approach
- D Concentric (spiral) approach
Show answer
Correct answer: (D) Concentric (spiral) approach
In the concentric or spiral approach a topic is revisited across classes, each time at a higher level, an idea linked with Jerome Bruner's spiral curriculum. In the topical approach a topic is completed in full at one stage.
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Q.68
Which of the following was the first fully synthetic fibre, made without using any natural raw material from plants or animals?
- A Rayon
- B Nylon
- C Acrylic
- D Polyester
Show answer
Correct answer: (B) Nylon
Nylon was prepared from coal, water and air and was the first fully synthetic fibre. Rayon is made from wood pulp, a natural raw material, and polyester and acrylic came later.
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Q.69
The National Children's Science Congress (NCSC), in which children carry out a small research project on a focal theme and present it, is meant for children of the age group:
- A 5 to 10 years
- B 14 to 21 years
- C 18 to 25 years
- D 10 to 17 years
Show answer
Correct answer: (D) 10 to 17 years
NCSC, run under the National Council for Science and Technology Communication (NCSTC) of the Department of Science and Technology, is for children aged 10 to 17, with junior (10 to 14) and senior (14 to 17) groups.
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Q.70
Many adolescents get pimples (acne) on the face. The main reason is that during adolescence:
- A The skin stops producing oil and becomes very dry
- B Fewer white blood cells are produced in the skin
- C Sweat and oil (sebaceous) glands become more active
- D Hair growing on the face blocks all the sweat pores
Show answer
Correct answer: (C) Sweat and oil (sebaceous) glands become more active
Hormonal changes during adolescence increase the secretion of the sweat glands and the sebaceous (oil) glands, and many young people get pimples and acne. Keeping the face clean is part of personal hygiene at this age.
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Q.71
Why do farmers loosen and turn the soil (ploughing or tilling) before sowing seeds?
- A It kills earthworms, which eat the roots of crops
- B It packs the soil hard so that plants stand firmly
- C Roots go deeper and breathe easily in loose soil
- D It removes the nutrients from the top layer of soil
Show answer
Correct answer: (C) Roots go deeper and breathe easily in loose soil
Loose soil lets roots penetrate deep and breathe easily, and it helps the growth of earthworms and microbes that add humus. Turning the soil also brings nutrient-rich soil to the top.
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Q.72
Yeast is mixed into flour dough and the dough is kept in a warm place. After some time the dough rises. This happens because:
- A Yeast makes oxygen by photosynthesis inside the dough
- B Warmth melts the starch in the flour and turns it into a gas
- C Yeast turns the water in the dough into steam
- D Yeast respires and gives out carbon dioxide, whose bubbles fill the dough
Show answer
Correct answer: (D) Yeast respires and gives out carbon dioxide, whose bubbles fill the dough
Yeast reproduces rapidly and produces carbon dioxide during respiration; the gas bubbles fill the dough and increase its volume. This is why yeast is used in making bread, pastries and cakes.
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Q.73
In the pitcher plant, an insectivorous plant, the pitcher-like structure that traps insects is a modified:
- A Stem
- B Root
- C Flower
- D Leaf
Show answer
Correct answer: (D) Leaf
The pitcher is a modified part of the leaf, and the apex of the leaf forms a lid that can open and close. Insects trapped inside are digested by digestive juices secreted in the pitcher.
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Q.74
Consider the following statements:
1. Polythene is a thermosetting plastic that cannot be softened again by heating.
2. A polymer is made up of many small units joined together.
3. Cotton is a natural polymer, cellulose, made up of a large number of glucose units.
Which of the statements given above are correct?
- A 1 and 2 only
- B 2 and 3 only
- C 1 and 3 only
- D 1, 2 and 3
Show answer
Correct answer: (B) 2 and 3 only
Synthetic fibres and plastics are polymers, long chains of small units, and cotton too is a polymer, cellulose, built from glucose units. Polythene is a thermoplastic that softens on heating and can be bent, so statement 1 is wrong.
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Q.75
When the leaves of a touch-me-not (chhui-mui) plant are touched, they fold up. This is an example of:
- A Growth of the plant in a new direction
- B Loss of water from the leaves by transpiration
- C Reproduction with the help of leaves
- D Response of a living thing to a stimulus
Show answer
Correct answer: (D) Response of a living thing to a stimulus
The touch is a stimulus and the folding of the leaves is the plant's response; responding to stimuli is a characteristic of living things. The leaves open again after some time, so this is not growth.
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Q.76
A few drops of phenolphthalein are added to dilute hydrochloric acid in a test tube, and sodium hydroxide solution is then added drop by drop with shaking. What will be observed?
- A It turns pink at once and becomes colourless as the base is added
- B It turns blue-black as soon as the first drop of base is added
- C It stays colourless at first and turns pink when it just becomes basic
- D It turns green in the acid and red when the base is added
Show answer
Correct answer: (C) It stays colourless at first and turns pink when it just becomes basic
Phenolphthalein is colourless in acidic and neutral solutions and pink in basic ones. The base gradually neutralises the acid, and a slight excess of base turns the solution pink; the reaction is neutralisation.
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Q.77
Which statement about how the sex of a human baby is determined is correct?
- A It depends on whether the mother's egg carries an X or a Y chromosome
- B It depends on the food the mother eats in the first months of pregnancy
- C It depends on the temperature of the mother's body at the time of fertilisation
- D It depends on whether the sperm carries an X or a Y chromosome
Show answer
Correct answer: (D) It depends on whether the sperm carries an X or a Y chromosome
All eggs carry an X chromosome, while a sperm carries either an X or a Y. Fertilisation by an X-bearing sperm gives an XX zygote that develops into a girl, and by a Y-bearing sperm an XY zygote, a boy; so the father's sperm decides the sex, and blaming the mother is wrong.
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Q.78
NEP 2020 proposes a redesigned progress card for school-based assessment. Which description matches it?
- A A marks sheet that shows only the scores obtained by the student in written tests
- B A rank list of all the students in the class
- C A holistic, 360-degree report that includes self- and peer assessment
- D A certificate issued only at the end of Class 10
Show answer
Correct answer: (C) A holistic, 360-degree report that includes self- and peer assessment
NEP 2020 describes the progress card as a holistic, 360-degree, multidimensional report of progress in the cognitive, affective and psychomotor domains, including self- and peer assessment and work such as projects, group work and portfolios.
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Q.79
Which of the following appliances does NOT work mainly on the heating effect of electric current?
- A Electric bell
- B Electric iron
- C Immersion water heater
- D Electric room heater
Show answer
Correct answer: (A) Electric bell
An electric bell works on the magnetic effect of current through its electromagnet. An electric iron, an immersion heater and a room heater all have elements that become hot when current flows through them.
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Q.80
In aerobic respiration, glucose is broken down in the cells using oxygen. The products of this process are:
- A Alcohol and carbon dioxide, with release of energy
- B Lactic acid only, with release of energy
- C Oxygen and glucose, with storage of energy
- D Carbon dioxide and water, with release of energy
Show answer
Correct answer: (D) Carbon dioxide and water, with release of energy
In aerobic respiration glucose is broken down with oxygen into carbon dioxide and water, and energy is released. Alcohol and carbon dioxide are formed in anaerobic respiration in yeast, and lactic acid in muscle cells that are short of oxygen.
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Q.81
The question 'Explain why ice floats on water' mainly tests which level of the revised Bloom's taxonomy?
- A Remember
- B Create
- C Understand
- D Evaluate
Show answer
Correct answer: (C) Understand
Asking a student to explain a phenomenon in their own words using the concept of density tests Understand (comprehension). Remember would be 'State the density of ice'; Evaluate would involve judging claims against criteria.
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Q.82
An electric fuse protects a circuit because of the:
- A Magnetic effect of current, which pulls the wires of the circuit apart
- B Chemical effect of current, which slowly dissolves its wire away
- C Insulating cover on its wire, which blocks large currents from flowing
- D Heating effect of current, which melts its wire if the current is too large
Show answer
Correct answer: (D) Heating effect of current, which melts its wire if the current is too large
A fuse wire is made of a material that melts quickly when a current larger than the safe limit flows, as in a short circuit or overloading. The circuit is broken, and damage or fire is prevented.
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Q.83
During a lesson, a student asks a question to which the teacher does not know the answer. The most appropriate response is:
- A 'I am not sure. Let us find out together,' and then explore it with the class
- B 'This is not in the syllabus, so you should not ask such questions.'
- C Tell the student to meet the teacher after school, and then forget about it
- D Give an answer that sounds correct, so as to keep up the teacher's authority in class
Show answer
Correct answer: (A) 'I am not sure. Let us find out together,' and then explore it with the class
Admitting uncertainty and finding out together models honesty, curiosity and the scientific attitude. A made-up answer or discouraging the question damages both trust and the culture of inquiry.
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Q.84
Consider the following statements:
1. Sodium is stored in kerosene because it reacts vigorously with oxygen and water.
2. White phosphorus is stored in water because it catches fire when exposed to air.
3. Sodium and potassium are so hard that they cannot be cut with a knife.
Which of the statements given above are correct?
- A 1 and 2 only
- B 2 and 3 only
- C 1 and 3 only
- D 1, 2 and 3
Show answer
Correct answer: (A) 1 and 2 only
Sodium reacts vigorously with oxygen and water, so it is kept in kerosene, and white phosphorus is kept in water to keep it away from air. Sodium and potassium are soft metals that can be cut with a knife, so statement 3 is wrong.
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Q.85
A student says that a black cat crossing the road brings bad luck. Which response by the science teacher best develops scientific temper?
- A Discuss respectfully what evidence could test such a claim
- B Tell the student never to talk about such beliefs in school
- C Laugh at the student in front of the whole class
- D Agree with the student so that no one's feelings are hurt
Show answer
Correct answer: (A) Discuss respectfully what evidence could test such a claim
Scientific temper grows when learners ask for evidence and examine claims through reasoning. A respectful discussion of how the belief could be tested builds this habit without humiliating the child, whereas ridicule or silence shuts down inquiry.
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Q.86
A Class 6 student says, 'We see an object because light goes out from our eyes and falls on it.' The scientific idea the teacher should help her build is that:
- A We can see objects even in complete darkness if we look carefully
- B Light travels from the eye to the object and then comes back to the eye
- C Our eyes give out light, but it is too weak for us to notice
- D Light from a source is reflected by the object into our eyes
Show answer
Correct answer: (D) Light from a source is reflected by the object into our eyes
We see a non-luminous object when light from a source is reflected by it into our eyes. The idea that the eye sends out rays is a common alternative conception; trying to see in a completely dark room helps challenge it.
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Q.87
Which of the following questions CANNOT be answered by a scientific investigation?
- A Does salt dissolve faster in warm water than in cold water?
- B Do earthworms move towards moist soil rather than dry soil?
- C Should people keep birds in cages as pets?
- D Does the amount of water affect how fast gram seeds germinate?
Show answer
Correct answer: (C) Should people keep birds in cages as pets?
Science deals with questions that can be answered by collecting evidence through observation or experiment. Whether birds should be caged is a question of values; science can inform the debate, for example about the birds' needs, but no experiment can settle it.
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Q.88
Consider the following statements about science at the upper primary stage according to NCF 2005:
1. Children should continue to learn about the environment and health, including reproductive and sexual health, through activities and surveys.
2. Science content at this stage should be a diluted version of secondary school science.
Which of the statements is/are correct?
- A Only 1
- B Only 2
- C Both 1 and 2
- D Neither 1 nor 2
Show answer
Correct answer: (A) Only 1
NCF 2005 asks that upper primary children continue learning about the environment and health, including reproductive and sexual health, through activities and surveys. It also states that science content at this stage is not to be regarded as a diluted version of secondary school science, so statement 2 is wrong.
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Q.89
In winter, several layers of thin clothing often keep us warmer than a single thick garment of the same material. The main reason is that:
- A Each layer of cloth produces some heat of its own
- B Thin layers of cloth are good conductors of heat
- C Air trapped between the layers is a poor conductor of heat
- D Several layers absorb more sunlight than one thick garment
Show answer
Correct answer: (C) Air trapped between the layers is a poor conductor of heat
Air is a poor conductor of heat, and the air trapped between layers of clothing slows the flow of heat from the body to the cold surroundings. Clothes do not produce heat themselves; wool keeps us warm for the same reason.
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Q.90
Consider the following statements about the nature of science:
1. Scientists may interpret the same data differently, depending on their prior knowledge and theories.
2. Scientific knowledge is influenced by the society and culture in which science is done.
Which of the statements is/are correct?
- A Only 1
- B Only 2
- C Both 1 and 2
- D Neither 1 nor 2
Show answer
Correct answer: (C) Both 1 and 2
Both are accepted features of the nature of science. What scientists observe and how they interpret it is shaped by what they already know and believe, and science as a human enterprise is affected by social and cultural factors, such as which problems are funded or considered important.
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Q.91
A bucket of water and a cup of water are both at 60 degrees Celsius. A student says both contain the same amount of heat. The teacher should recognise this as:
- A A misconception confusing heat with temperature; the temperature is the same but the bucket contains more heat energy
- B A correct statement since the temperatures are equal
- C A correct statement because the cup, being smaller, has more concentrated heat
- D A statement that cannot be judged without knowing the room temperature
Show answer
Correct answer: (A) A misconception confusing heat with temperature; the temperature is the same but the bucket contains more heat energy
Temperature is a measure of the average kinetic energy of particles, while heat energy content depends also on mass. The bucket has far more water and hence far more thermal energy at the same temperature.
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Q.92
A school collects rainwater from its rooftop through pipes and directs it into a tank and into a pit dug in the ground. Which statement best describes the benefit of this practice?
- A It increases the amount of rainfall in the area
- B It makes the rainwater so pure that it never needs any treatment
- C It stops water from evaporating in the water cycle
- D It stores water for use and helps to recharge groundwater
Show answer
Correct answer: (D) It stores water for use and helps to recharge groundwater
Rooftop rainwater harvesting collects rainwater that would otherwise run off; the water can be stored for use, and water led into pits seeps down to recharge groundwater. It does not change how much rain falls.
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Q.93
A student explains, 'The bulb uses up the current, so less current flows back to the battery than flows out of it.' This idea is:
- A Correct for all circuits
- B A misconception; the current is the same at every point in a series circuit, and it is energy that is transferred in the bulb
- C Correct only for direct current
- D Correct only when two bulbs are connected in series
Show answer
Correct answer: (B) A misconception; the current is the same at every point in a series circuit, and it is energy that is transferred in the bulb
Current (flow of charge) is conserved in a series circuit; the same current enters and leaves the bulb. What the bulb converts is electrical energy into heat and light, not the current itself.
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Q.94
A student says, 'A steel spoon sinks because it is heavy.' The teacher responds, 'What makes you say that? Can you explain your reasoning?' This kind of question is a:
- A Rhetorical question
- B Probing question
- C Leading question
- D Recall question
Show answer
Correct answer: (B) Probing question
A probing question follows up a student's answer to draw out reasoning, clarification or justification. It pushes the student to examine the idea instead of the teacher simply judging it right or wrong. A leading question, by contrast, hints at the answer the teacher expects.
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Q.95
A ray of light strikes a plane mirror making an angle of 40° with the surface of the mirror. What is the angle of reflection?
- A 40°
- B 80°
- C 100°
- D 50°
Show answer
Correct answer: (D) 50°
Angles of incidence and reflection are measured from the normal, which is perpendicular to the mirror. The angle of incidence is 90° - 40° = 50°, and by the law of reflection the angle of reflection is also 50°.
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Q.96
To electroplate an iron key with copper, using copper sulphate solution and a copper plate, the key should be connected to the:
- A Positive terminal of the battery
- B Copper plate directly, with no battery
- C Negative terminal of the battery
- D Positive terminal, together with the copper plate
Show answer
Correct answer: (C) Negative terminal of the battery
The object to be plated is connected to the negative terminal, and copper from the solution is deposited on it. The copper plate is connected to the positive terminal, and copper from it dissolves into the solution.
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Q.97
The Red Data Book is best described as:
- A A record of endangered species of plants and animals
- B A list of all the plants used as medicines in a country
- C A register of the forest area cut down every year
- D A catalogue of the fossils of animals that died out long ago
Show answer
Correct answer: (A) A record of endangered species of plants and animals
The Red Data Book is a source book that keeps a record of endangered species of plants and animals. It is maintained internationally, and India also maintains one for its own plants and animals.
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Q.98
To make a battery of two cells for a torch, the cells are joined so that:
- A The positive terminals of the two cells are made to touch each other
- B The negative terminals of the two cells are made to touch each other
- C The two cells lie side by side so that they do not touch each other
- D The positive terminal of one touches the negative terminal of the other
Show answer
Correct answer: (D) The positive terminal of one touches the negative terminal of the other
In a battery, cells are joined one after another, the positive terminal of one to the negative terminal of the next. This is how two cells are placed in a torch.
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Q.99
In the NCF 2005 framework for science, 'ethical validity' of the curriculum means that it should:
- A Teach only the applied and industrial aspects of science
- B Promote values of honesty, objectivity, cooperation and freedom from fear and prejudice
- C Avoid any discussion of social issues in the science class
- D Replace scientific explanations with moral stories
Show answer
Correct answer: (B) Promote values of honesty, objectivity, cooperation and freedom from fear and prejudice
Ethical validity asks the science curriculum to foster honesty, objectivity, cooperation, freedom from fear and prejudice, and concern for life and the environment, along with the values that scientific work demands.
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Q.100
Which of the following pairs consists only of kharif crops, sown in the rainy season?
- A Wheat and gram
- B Mustard and pea
- C Wheat and maize
- D Paddy and maize
Show answer
Correct answer: (D) Paddy and maize
Kharif crops are sown in the rainy season (in India generally June to September); paddy, maize, soyabean, groundnut and cotton are examples. Wheat, gram, pea and mustard are rabi crops grown in winter.
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How these questions were made
Authored by an AI assistant (Claude) from its own general knowledge of stable, well-established facts (no live lookup) - not reviewed by a subject-matter expert; verify against an official source before relying on any fact.