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Latest Bihar STET Science Exam Question (Objective Questions), MCQ in English

Subjects : Science, Art of Teaching, General Knowledge, Environmental Science, Mathematical aptitude, Logical Reasoning

Question Bank Bihar STET Science Paper-1 Exam - English
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Science

Question 1Single Answer
In the context of improving crop quality, which type of fertilizer provides a balanced supply of nitrogen, phosphorus, and potassium, but may lead to soil acidification if overused?
  1. A
    Organic manure
  2. B
    Urea-based chemical fertilizer
  3. C
    Green manure
  4. D
    NPK complex fertilizer
Question 2Single Answer
How does the application of biofertilizers, such as Rhizobium in leguminous crops, enhance quality improvement while minimizing environmental impact?
  1. A
    By increasing soil pH
  2. B
    By fixing atmospheric nitrogen symbiotically
  3. C
    By providing immediate nutrient release
  4. D
    By enhancing pesticide resistance
Question 3Single Answer
What is the primary mechanism by which farmyard manure improves soil structure and crop quality in sustainable agriculture?
  1. A
    Rapid nutrient dissolution
  2. B
    Enhancing soil organic matter and water retention
  3. C
    Increasing soil salinity
  4. D
    Promoting weed growth
Question 4Single Answer
In organic farming practices, which method of pest control involves using neem oil, and how does it contribute to quality improvement without chemical residues?
  1. A
    Biological control
  2. B
    Cultural control
  3. C
    Mechanical control
  4. D
    Botanical pesticide application
Question 5Single Answer
What is the role of crop rotation in quality improvement and disease prevention, particularly in preventing soil-borne pathogens like Fusarium wilt?
  1. A
    It increases monoculture yields
  2. B
    It disrupts pathogen life cycles and nutrient depletion
  3. C
    It enhances pesticide efficacy
  4. D
    It promotes uniform soil pH
Question 6Single Answer
Which integrated pest management (IPM) strategy combines the use of pheromone traps for monitoring insect populations, thereby reducing chemical pesticide use and improving crop quality?
  1. A
    Chemical control
  2. B
    Cultural control
  3. C
    Biological and monitoring control
  4. D
    Physical control
Question 7Single Answer
In animal reproduction for quality improvement, selective breeding in dairy cattle aims to enhance milk yield; what genetic principle underlies this process?
  1. A
    Mutation
  2. B
    Gene flow
  3. C
    Hybrid vigor (heterosis)
  4. D
    Genetic drift
Question 8Single Answer
How does the use of vermicompost as an organic manure contribute to quality improvement by enhancing microbial activity in soil?
  1. A
    By increasing soil compaction
  2. B
    By accelerating erosion
  3. C
    By raising soil temperature
  4. D
    By promoting beneficial earthworm activity for nutrient cycling
Question 9Single Answer
What is the impact of excessive use of chemical fertilizers on crop quality and soil health, particularly regarding nutrient imbalance?
  1. A
    It enhances micronutrient availability
  2. B
    It leads to soil acidification and reduced organic matter
  3. C
    It promotes balanced pH levels
  4. D
    It increases water retention capacity
Question 10Single Answer
In organic farming, how does intercropping with legumes improve crop quality and protect against soil erosion?
  1. A
    By fixing nitrogen and providing ground cover
  2. B
    By increasing monoculture yields
  3. C
    By enhancing pesticide use
  4. D
    By promoting weed proliferation
Question 11Single Answer
Which disease control method in quality improvement involves the use of resistant varieties like Bt cotton for bollworm resistance?
  1. A
    Chemical spraying
  2. B
    Cultural practices
  3. C
    Mechanical removal
  4. D
    Genetic resistance
Question 12Single Answer
What is the role of green manuring with crops like Sesbania in improving soil fertility and crop quality?
  1. A
    It adds organic matter upon decomposition
  2. B
    It depletes soil nutrients
  3. C
    It increases soil salinity
  4. D
    It promotes pest infestation
Question 13Single Answer
In animal quality improvement, artificial insemination is used to introduce superior genes; what is a potential risk associated with this technique?
  1. A
    Lower feed requirements
  2. B
    Increased disease resistance
  3. C
    Enhanced milk yield immediately
  4. D
    Reduced genetic diversity
Question 14Single Answer
How does the practice of mulching in organic farming contribute to quality improvement by conserving soil moisture and suppressing weeds?
  1. A
    By increasing evaporation rates
  2. B
    By promoting soil compaction
  3. C
    By enhancing chemical fertilizer use
  4. D
    By providing a physical barrier and organic matter
Question 15Single Answer
What is the biochemical mechanism by which phosphatic fertilizers like DAP improve crop quality by enhancing root development?
  1. A
    Nitrogen fixation
  2. B
    Potassium uptake for water regulation
  3. C
    Phosphorus absorption for energy transfer
  4. D
    Calcium addition for cell wall strength
Question 16Single Answer
In pest protection, how does the use of neem-based biopesticides improve crop quality by targeting specific insects without harming beneficial pollinators?
  1. A
    By selective toxicity and low persistence
  2. B
    By broad-spectrum killing
  3. C
    By increasing soil salinity
  4. D
    By promoting resistance development
Question 17Single Answer
For animal reproduction, what is the purpose of embryo transfer technology in improving livestock quality?
  1. A
    To increase genetic uniformity
  2. B
    To enhance disease susceptibility
  3. C
    To reduce breeding costs immediately
  4. D
    To accelerate genetic propagation from superior dams
Question 18Single Answer
Which organic farming practice, such as composting, improves crop quality by recycling farm waste and enhancing soil biodiversity?
  1. A
    Chemical application
  2. B
    Nutrient cycling through decomposition
  3. C
    Synthetic fertilizer use
  4. D
    Monoculture planting
Question 19Single Answer
What is the environmental impact of overusing potassic fertilizers on crop quality and soil health?
  1. A
    Improved water retention
  2. B
    Potential for nutrient leaching and groundwater pollution
  3. C
    Enhanced organic matter
  4. D
    Reduced pest infestation
Question 20Single Answer
In disease protection, how does the use of integrated nutrient management (INM) contribute to quality improvement by balancing chemical and organic inputs?
  1. A
    By promoting nutrient imbalance
  2. B
    By sustaining soil health and reducing disease incidence
  3. C
    By increasing synthetic input
  4. D
    By enhancing monoculture risks
Question 21Single Answer
Which method of animal quality improvement involves inbreeding to fix desirable traits, but risks inbreeding depression?
  1. A
    Selective breeding
  2. B
    Outcrossing
  3. C
    Crossbreeding
  4. D
    Mutation breeding
Question 22Single Answer
How does the application of micronutrients like zinc in fertilizers improve crop quality by addressing deficiency symptoms in cereals?
  1. A
    By increasing nitrogen fixation
  2. B
    By enhancing enzyme activity and yield
  3. C
    By promoting weed growth
  4. D
    By raising soil pH
Question 23Single Answer
In organic farming, what is the role of cover crops like clover in quality improvement and pest protection?
  1. A
    By depleting soil nutrients
  2. B
    By suppressing weeds and improving soil structure
  3. C
    By increasing chemical use
  4. D
    By promoting erosion
Question 24Single Answer
What is the genetic basis for using hybrid vigor in maize production to improve crop quality?
  1. A
    Homozygosity
  2. B
    Heterosis from crossing diverse parents
  3. C
    Genetic drift
  4. D
    Gene flow
Question 25Single Answer
Which pest control method in quality improvement uses predatory insects like ladybirds for aphid control, reducing chemical residues?
  1. A
    Chemical spraying
  2. B
    Biological control
  3. C
    Cultural practices
  4. D
    Mechanical removal
Question 26Single Answer
How does the use of compost tea in organic farming improve crop quality by enhancing plant immunity?
  1. A
    By increasing soil salinity
  2. B
    By accelerating erosion
  3. C
    By promoting nutrient leaching
  4. D
    By providing beneficial microbes
Question 27Single Answer
In animal reproduction, what is the advantage of cloning in quality improvement for livestock?
  1. A
    Increases genetic diversity
  2. B
    Produces genetically identical superior animals
  3. C
    Reduces breeding costs immediately
  4. D
    Enhances disease resistance automatically
Question 28Single Answer
What is the role of balanced fertilization in preventing nutrient deficiencies and improving crop quality?
  1. A
    By maintaining soil nutrient equilibrium
  2. B
    By promoting over-fertilization
  3. C
    By increasing soil compaction
  4. D
    By enhancing pest infestation
Question 29Single Answer
How does the practice of no-till farming in organic systems contribute to quality improvement and soil conservation?
  1. A
    By increasing erosion
  2. B
    By promoting chemical use
  3. C
    By preserving soil structure and organic matter
  4. D
    By depleting biodiversity
Question 30Single Answer
In disease protection, what is the mechanism of using copper-based fungicides for quality improvement in vineyards?
  1. A
    By promoting fungal growth
  2. B
    By increasing soil salinity
  3. C
    By disrupting fungal cell membranes
  4. D
    By enhancing nutrient leaching
Question 31Single Answer
Which breeding technique in animals uses marker-assisted selection to improve traits like disease resistance?
  1. A
    Artificial selection with genetic markers
  2. B
    Natural selection
  3. C
    Random mating
  4. D
    Inbreeding
Question 32Single Answer
How does the application of lime in acidic soils improve crop quality by neutralizing pH?
  1. A
    By increasing acidity
  2. B
    By accelerating erosion
  3. C
    By promoting weed growth
  4. D
    By raising pH for optimal nutrient availability
Question 33Single Answer
In organic farming, what is the benefit of using trap crops like marigold for nematode control in quality improvement?
  1. A
    By attracting pests away from main crops
  2. B
    By increasing nematode population
  3. C
    By enhancing chemical use
  4. D
    By promoting soil compaction
Question 34Single Answer
What is the role of sexed semen in animal reproduction for quality improvement in dairy herds?
  1. A
    To increase female calves for milk production
  2. B
    To produce mixed-sex offspring
  3. C
    To reduce genetic diversity
  4. D
    To enhance meat yield
Question 35Single Answer
Which micronutrient deficiency, addressed by foliar sprays, improves crop quality by preventing chlorosis in citrus?
  1. A
    Nitrogen
  2. B
    Iron
  3. C
    Potassium
  4. D
    Calcium
Question 36Single Answer
How does the use of Bacillus thuringiensis (Bt) toxins in organic pest control improve crop quality?
  1. A
    By broad-spectrum killing
  2. B
    By increasing soil salinity
  3. C
    By targeting specific insect pests
  4. D
    By promoting resistance development
Question 37Single Answer
In quality improvement, what is the advantage of mass selection in plant breeding for crops like wheat?
  1. A
    It introduces new genes
  2. B
    It reduces genetic variation
  3. C
    It selects superior plants from a population
  4. D
    It promotes inbreeding
Question 38Single Answer
What is the environmental benefit of using slow-release fertilizers for crop quality improvement?
  1. A
    Increased leaching and pollution
  2. B
    Enhanced soil compaction
  3. C
    Reduced nutrient loss and environmental impact
  4. D
    Promotion of weed growth
Question 39Single Answer
How does companion planting with marigolds in vegetable gardens protect against nematodes for quality improvement?
  1. A
    By attracting nematodes
  2. B
    By increasing soil salinity
  3. C
    By releasing allelopathic chemicals
  4. D
    By promoting erosion
Question 40Single Answer
In animal quality improvement, what is the purpose of genomic selection in breeding programs?
  1. A
    To ignore genetic markers
  2. B
    To predict breeding values using DNA
  3. C
    To increase inbreeding
  4. D
    To reduce trait variation
Question 41Single Answer
What is the primary molecular mechanism behind evaporation absorbing heat from the surroundings?
  1. A
    Decrease in vapor pressure
  2. B
    Kinetic energy increase in liquid molecules
  3. C
    Increase in intermolecular forces
  4. D
    Reduction in surface tension
Question 42Single Answer
How does the rate of evaporation vary with temperature, and what is the thermodynamic reason?
  1. A
    Varies inversely due to humidity
  2. B
    Decreases with temperature due to stronger bonds
  3. C
    Remains constant due to equilibrium
  4. D
    Increases with temperature due to higher molecular kinetic energy
Question 43Single Answer
In the context of latent heat, why does evaporation lead to cooling, as seen in sweat evaporation?
  1. A
    Absorption of heat for phase change
  2. B
    Energy release during condensation
  3. C
    Decrease in atmospheric pressure
  4. D
    Increase in surface area
Question 44Single Answer
What role does surface area play in evaporation rate, and how does it relate to heat absorption?
  1. A
    Surface area has no effect on molecular escape
  2. B
    Smaller surface area enhances heat absorption
  3. C
    Larger surface area increases evaporation by exposing more molecules to air
  4. D
    Larger surface area reduces vapor pressure
Question 45Single Answer
How does humidity affect evaporation and heat absorption, based on vapor pressure gradients?
  1. A
    High humidity increases evaporation by lowering vapor pressure
  2. B
    High humidity decreases evaporation by reducing the pressure gradient
  3. C
    Humidity has no impact on heat transfer
  4. D
    Low humidity decreases heat absorption
Question 46Single Answer
What is the latent heat of vaporization, and how does it explain the cooling effect in evaporation?
  1. A
    Heat released during evaporation
  2. B
    Heat for kinetic energy reduction
  3. C
    Heat for temperature rise during phase change
  4. D
    Heat absorbed to overcome intermolecular forces without temperature change
Question 47Single Answer
In terms of kinetic molecular theory, why do faster-moving molecules escape during evaporation, leading to net heat absorption?
  1. A
    Slower molecules have higher energy
  2. B
    Bonds strengthen during escape
  3. C
    Average energy remains constant
  4. D
    Faster molecules carry away more kinetic energy
Question 48Single Answer
How does wind speed influence evaporation rate and associated heat absorption?
  1. A
    Increases evaporation by removing saturated air layer
  2. B
    Decreases evaporation by increasing humidity
  3. C
    Has no effect on molecular movement
  4. D
    Reduces heat absorption by cooling air
Question 49Single Answer
What is the role of intermolecular forces in evaporation and heat absorption?
  1. A
    Stronger forces increase evaporation rate
  2. B
    Weaker forces in liquids facilitate easier escape and heat absorption
  3. C
    Forces prevent heat transfer
  4. D
    Forces increase vapor pressure
Question 50Single Answer
In a closed system, how does evaporation reach equilibrium, and what happens to net heat absorption?
  1. A
    No equilibrium in closed systems
  2. B
    Equilibrium increases heat absorption
  3. C
    Equilibrium occurs when condensation equals evaporation, net heat zero
  4. D
    Equilibrium reduces molecular energy
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