Which of the following is NOT an advantage of manure over fertilizers?
A.Enhances water holding capacity
B.Makes soil porous
C.Provides immediate nutrient availability
D.Increases friendly microorganisms
What is crop rotation and why is it beneficial?
A.Growing the same crop repeatedly for higher yield
B.Growing different crops alternately to replenish soil nutrients
C.Rotating crops around the field
D.Changing crop varieties each season
What is the difference between traditional and modern irrigation methods?
A.Traditional methods use more water
B.Modern methods are more expensive but water-efficient
C.Traditional methods are faster
D.There is no significant difference
What happens if fertilizers are used excessively?
A.Crops grow better
B.Soil becomes more fertile
C.Soil becomes less fertile and causes water pollution
D.Nothing significant happens
How does drip irrigation help in weed control?
A.It kills weeds with chemicals
B.Water is delivered only to crop plants, not to areas where weeds might grow
C.It makes soil too wet for weeds
D.It physically removes weeds
Why is understanding agricultural practices important for students?
A.Only for those who want to become farmers
B.To understand food production, environmental impact, and make informed decisions as consumers
C.It's not important for students
D.Only for rural students
What is the symbiotic relationship between Rhizobium and leguminous plants?
A.Rhizobium harms the plant
B.Both benefit: plant gets nitrogen, bacteria gets shelter and food
C.Only the plant benefits
D.Only the bacteria benefits
How do vaccines provide long-term protection?
A.They kill all germs permanently
B.Body remembers how to fight the microbe and produces antibodies when needed
C.They make the body immune to all diseases
D.They strengthen the body permanently
What would happen if all decomposer microorganisms disappeared?
A.Nothing would change
B.Dead organic matter would accumulate and nutrients wouldn't be recycled
C.All plants would grow better
D.The air would become cleaner
Why is it important to complete the full course of antibiotics?
A.To avoid waste
B.To ensure all harmful bacteria are killed and prevent antibiotic resistance
C.To make the medicine more effective
D.To avoid side effects
Why can microorganisms survive in extreme conditions?
A.They are very large
B.They have simple structure and can adapt quickly
C.They don't need food
D.They don't need oxygen
What is the role of microorganisms in sewage treatment?
A.They make sewage smell better
B.They break down organic pollutants and clean water
C.They add chemicals to water
D.They remove all water
How do microorganisms contribute to the carbon cycle?
A.They produce carbon dioxide during decomposition
B.They absorb carbon from air
C.They convert carbon to nitrogen
D.They store carbon permanently
What is the difference between sterilization and pasteurization?
A.No difference, they are the same
B.Sterilization kills all microorganisms, pasteurization kills only harmful ones
C.Sterilization is for liquids, pasteurization for solids
D.Sterilization is faster than pasteurization
What lesson does studying microorganisms teach us about invisible threats and benefits in our environment?
A.Only visible things matter
B.Small, invisible organisms can have huge impacts on our lives and environment
C.Microorganisms are not important
D.Only harmful microorganisms exist
What is the significance of the activity with eatables representing fossil fuels?
A.It shows how to share food
B.It demonstrates how growing population affects resource availability
C.It teaches about different foods
D.It shows cooking methods
Why can't we create fossil fuels artificially in a short time?
A.We lack the technology
B.The natural process takes millions of years under specific geological conditions
C.It's too expensive
D.We don't have the raw materials
What role does coke play in steel manufacturing?
A.It provides color to steel
B.It acts as a reducing agent to remove impurities
C.It cools down the steel
D.It adds strength to steel
What is the long-term solution to the fossil fuel depletion problem?
A.Finding more fossil fuel reserves
B.Using fossil fuels more efficiently
C.Developing and using renewable energy sources
D.Reducing population
What lesson about resource management can we learn from studying fossil fuels?
A.All resources are unlimited
B.We should use resources wisely as they took millions of years to form but can be depleted quickly
C.Only worry about resources when they run out
D.Technology will solve all resource problems
How do the three generations in the activity represent real-world resource consumption?
A.They show different age groups
B.They represent how increasing population consumes limited resources faster
C.They show different income levels
D.They represent different countries
Why is understanding fossil fuels important for environmental awareness?
A.To know where to find them
B.To understand their impact on climate change and the need for sustainable alternatives
C.To use them more efficiently
D.To become a petroleum engineer
What is acid rain and how is it formed?
A.Rain mixed with acids from laboratories
B.Rain that becomes acidic when oxides of sulfur and nitrogen dissolve in it
C.Rain that falls in acidic regions
D.Rain that is naturally acidic
Which part of the matchstick contains white phosphorus in old-style matches?
A.The wooden stick
B.The head of the match
C.The striking surface
D.White phosphorus was never used
Why do modern safety matches use red phosphorus instead of white phosphorus?
A.Red phosphorus is cheaper
B.Red phosphorus is much less dangerous than white phosphorus
C.Red phosphorus burns better
D.Red phosphorus is more available
What is the advantage of using a glass tube in the dark zone of a flame?
A.It cools the flame
B.It proves that unburnt vapors are present in the dark zone
C.It makes the flame brighter
D.It increases the flame temperature
Why is hydrogen considered an excellent fuel despite safety concerns?
A.It is very cheap
B.It has extremely high calorific value (150,000 kJ/kg)
C.It is available everywhere
D.It burns very slowly
How does burning fossil fuels contribute to acid rain?
A.Fossil fuels contain acids
B.Burning releases sulfur and nitrogen oxides which form acids in rainwater
C.Fossil fuels make clouds acidic
D.Fossil fuels change the pH of air
What long-term environmental solution can reduce combustion-related pollution?
A.Using more coal
B.Transitioning to renewable energy sources like solar and wind
C.Burning fuels more slowly
D.Using only liquid fuels
Why is understanding combustion important for environmental protection?
A.It helps us burn more efficiently
B.It helps us understand pollution sources and develop cleaner alternatives
C.It makes fuels cheaper
D.It helps us find more fuel
How are identical twins formed?
A.Two eggs fertilized by two sperms
B.One fertilized egg splits into two
C.Two eggs fertilized by one sperm
D.External fertilization
Why do animals that undergo external fertilization produce more gametes?
A.They have more reproductive organs
B.To compensate for losses due to predation and environmental factors
C.They live longer
D.Water makes them produce more
What determines whether a bee egg develops into a queen, worker, or drone?
A.Temperature of the hive
B.Size of the egg
C.Whether the egg is fertilized and the diet provided
D.Time of year
Why can't humans reproduce asexually like hydra?
A.Humans are too large
B.Humans have complex body organization requiring sexual reproduction
C.Humans live on land
D.Humans don't have tentacles
What is the advantage of genetic variation from sexual reproduction?
A.Offspring are identical to parents
B.Better adaptation to changing environments
C.Faster reproduction
D.Less energy required
What is the main purpose of the large number of mitochondria in sperm's middle piece?
A.To store genetic material
B.To provide energy for swimming
C.To digest the egg membrane
D.To produce hormones
Why was Dolly the sheep identical to the Finn Dorsett sheep and not the Scottish Blackface ewe?
A.The Finn Dorsett sheep was her mother
B.The nucleus with genetic material came from Finn Dorsett sheep
C.She was fed Finn Dorsett milk
D.Scottish Blackface genes were removed
What would happen if a hydra's bud didn't separate from the parent?
A.Both would die
B.They would continue living as a colony
C.The bud would shrink
D.The parent would absorb it back
Why is reproduction essential for species but not for individual survival?
A.Individuals can live without reproducing
B.Reproduction uses too much energy
C.Only some individuals need to reproduce
D.Reproduction is harmful to individuals
What role does temperature play in reptile reproduction?
A.It determines egg size
B.It can determine the sex of offspring in some species
C.It prevents egg laying
D.It has no effect
Which reproductive strategy would be most advantageous in a stable, unchanging environment?
A.Sexual reproduction with high genetic variation
B.Asexual reproduction producing identical offspring
C.External fertilization
D.Metamorphosis
Why might cloning be controversial?
A.It's too expensive
B.It raises ethical concerns about creating life artificially
C.It always fails
D.Cloned animals live forever
What would be the main challenge in conserving species that reproduce through external fertilization?
A.They reproduce too slowly
B.They need specific water conditions for successful reproduction
C.They only reproduce once
D.They cannot be observed
If a 9-year-old boy is 120 cm tall and has reached 75% of his full height, what will be his predicted adult height?
A.150 cm
B.160 cm
C.140 cm
D.180 cm
What happens if tadpoles don't get enough iodine in water?
A.They grow faster
B.They cannot metamorphose into frogs
C.They become larger
D.Nothing happens
What is the target site in hormone action?
A.The brain
B.Specific body part where hormone acts
C.The blood
D.All body parts equally
Why is adolescence called a period of storm and stress?
A.Because of bad weather
B.Due to rapid physical and emotional changes
C.Because of school pressure
D.Due to poor nutrition
What controls metamorphosis in frogs?
A.Insulin
B.Thyroxine
C.Adrenalin
D.Growth hormone
Why don't we feel crushed by atmospheric pressure?
A.Atmospheric pressure is very small
B.We are too strong
C.Pressure inside our body balances the outside pressure
D.We are protected by our clothes
How does a suction cup stick to a wall?
A.It uses glue
B.Atmospheric pressure pushes it against the wall
C.It has magnetic properties
D.It uses static electricity
If you apply a 20N force on an area of 4 cm², what is the pressure?
A.5 N/cm²
B.80 N/cm²
C.24 N/cm²
D.16 N/cm²
Which force is responsible for keeping planets in orbit around the sun?
A.Magnetic force
B.Electrostatic force
C.Gravitational force
D.Friction force
Why do mountaineers sometimes experience difficulty in breathing at high altitudes?
A.Too much oxygen
B.Lower atmospheric pressure
C.Higher atmospheric pressure
D.Too much carbon dioxide
Why do streamlined shapes experience less friction?
A.They are heavier
B.They cut through air/water more easily
C.They are made of special materials
D.They move slower
What happens to water in a dropper when you release pressure on the bulb?
A.Water comes out
B.Water goes up due to atmospheric pressure
C.Nothing happens
D.Water turns to vapor
Which force acts on a freely falling object?
A.Only gravitational force
B.Only air resistance
C.Both gravitational force and air resistance
D.No force acts
What would happen if there were no atmospheric pressure?
A.Nothing would change
B.Liquids would boil at room temperature
C.We would float
D.Gravity would stop working
What force is responsible for the tides in oceans?
A.Earth's rotation
B.Moon's gravitational force
C.Wind force
D.Magnetic force
What is the advantage of using a lever?
A.It reduces the force needed to do work
B.It increases the weight of objects
C.It makes objects move faster
D.It changes the color of objects
Why do deep sea divers wear special suits?
A.To look professional
B.To protect from high water pressure
C.To swim faster
D.To stay warm only
What makes it possible to drink through a straw?
A.Suction from mouth
B.Atmospheric pressure pushes liquid up when air pressure inside straw is reduced
C.Gravitational force
D.Magnetic force
Which example best demonstrates that force has both magnitude and direction?
A.A ball at rest
B.Kicking a ball in different directions with same force
C.A heavy object
D.A light object
Why do we feel lighter when swimming in water?
A.Water reduces gravity
B.Water exerts upward pressure (buoyant force)
C.We actually become lighter
D.Water removes weight
What is the correct order of friction from largest to smallest?
A.Rolling, sliding, static
B.Static, sliding, rolling
C.Sliding, static, rolling
D.Rolling, static, sliding
Why can't we eliminate friction completely?
A.It's too expensive
B.No surface is perfectly smooth
C.It would be dangerous
D.We don't have the technology
What happens to energy due to friction?
A.Energy is destroyed
B.Energy is converted to heat
C.Energy doubles
D.Energy becomes light
How does fluid friction depend on speed?
A.It decreases with speed
B.It increases with speed
C.It remains constant
D.It has no relation to speed
Why is the wheel considered one of humanity's greatest inventions?
A.It looks round
B.It greatly reduced friction for transportation
C.It was easy to make
D.It was the first invention
Through which medium does sound travel fastest?
A.Air (gas)
B.Water (liquid)
C.Steel (solid)
D.Sound travels at same speed in all media
Why do we see lightning before hearing thunder?
A.Lightning is brighter than thunder
B.Light travels faster than sound
C.Thunder is quieter than lightning
D.Our eyes are better than ears
What is the time period if frequency is 25 Hz?
A.0.04 seconds
B.25 seconds
C.1 second
D.0.25 seconds
What determines the quality of voice - high or low?
A.Lung capacity
B.Tension of vocal cords
C.Age of person
D.Amount of air
If the loudness of sound is proportional to the square of amplitude, what happens when amplitude doubles?
A.Loudness doubles
B.Loudness becomes 4 times
C.Loudness halves
D.Loudness remains same
What happens to the copper in the solution during copper electroplating?
A.It disappears completely
B.Concentration is maintained as copper dissolves from positive electrode
C.It doubles in amount
D.It changes into another metal
Why might rainwater conduct electricity even though it's supposed to be pure?
A.Rain is always impure
B.It dissolves gases and dust particles from air
C.Rain is hot
D.Rain contains fish
What happens if a conducting liquid is too weak to make a bulb glow?
A.Liquid is definitely non-conducting
B.Current is too weak but liquid still conducts
C.Bulb is broken
D.Battery is dead
What scientific discovery principle does Boojho's potato experiment illustrate?
A.Always follow instructions exactly
B.Unexpected observations can lead to useful discoveries
C.Experiments should be repeated many times
D.Potatoes are good conductors
Which type of materials should be classified as good and poor conductors rather than conductors and non-conductors?
A.Only metals
B.All materials
C.Only liquids
D.Only gases
Why is sugar solution a poor conductor even though sugar dissolves in water?
A.Sugar is too sweet
B.Sugar doesn't form ions when dissolved
C.Sugar makes water thick
D.Sugar blocks electricity
How is electroplating used for copper purification?
A.Pure copper rod as positive, pure copper deposits on negative
B.Impure copper rod as positive, pure copper deposits on negative
C.Both electrodes are pure copper
D.Neither electrode is copper
Why might the compass needle not deflect even if liquid conducts electricity?
A.Compass is broken
B.Current is too weak to create detectable magnetic field
C.Liquid is too hot
D.Liquid is moving too fast
How much more destructive energy does a magnitude 6 earthquake have compared to magnitude 4?
A.2 times more
B.1000 times more
C.100 times more
D.10 times more
What other phenomena can cause tremors besides plate movement?
A.Heavy rain
B.Volcanic eruptions and underground explosions
C.Strong winds
D.Ocean tides
What makes the Richter scale different from a linear scale?
A.It measures temperature
B.An increase of 2 means 1000 times more energy
C.It only goes to 10
D.It measures weight
Does diffused reflection follow the laws of reflection?
A.No, it violates both laws
B.Yes, laws apply at each point on the surface
C.Only the first law applies
D.Only the second law applies
What is the blind spot in the eye?
A.Area with too many rods
B.Junction of optic nerve and retina with no sensory cells
C.Center of the pupil
D.Edge of the cornea
Why do owls see well at night but poorly during day?
A.They have small eyes
B.They have large cornea, large pupil, and more rods than cones
C.They close their eyes during day
D.They are afraid of light
Why do day birds like eagles see well during day but not at night?
A.They have small eyes
B.They have more cones and fewer rods
C.They sleep at night
D.They have poor eyesight
Can the image formed by a plane mirror be obtained on a screen?
A.Yes, always
B.No, because it's a virtual image
C.Only in bright light
D.Only with special screens