What safety precaution should farmers take when spraying weedicides?
A.Spray during rain
B.Cover nose and mouth with cloth
C.Spray during strong winds
D.Use maximum concentration
What is electroplating?
A.Cleaning metals with electricity
B.Depositing a layer of one metal on another using electricity
C.Making metals magnetic
D.Heating metals with electricity
What happens to the sound of a cell phone when air is sucked out of a container?
A.Sound becomes louder
B.Sound becomes fainter
C.Sound remains the same
D.Sound changes pitch
What is the eardrum?
A.A bone in the ear
B.A thin stretched membrane
C.A muscle in the ear
D.The outer part of the ear
Which force is responsible for keeping planets in orbit around the sun?
A.Magnetic force
B.Electrostatic force
C.Gravitational force
D.Friction force
What is the source of all sounds?
A.Moving objects
B.Vibrating objects
C.Hot objects
D.Large objects
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
What is music?
A.Any soft sound
B.Pleasant sound that is agreeable to listen
C.High pitched sound
D.Sound from instruments only
How does the shape of an airplane help it fly efficiently?
A.It looks attractive
B.Streamlined shape reduces air resistance
C.It makes the plane lighter
D.It increases engine power
What is the voice box in humans called?
A.Windpipe
B.Larynx
C.Throat
D.Adam's apple
Why is water not suitable for extinguishing electrical fires?
A.Water is too heavy
B.Water may conduct electricity and harm people trying to douse the fire
C.Water makes electrical fires worse
D.Water evaporates too quickly
What is the role of estrogen in females?
A.Causes voice deepening
B.Responsible for female characteristics and menstrual cycle
C.Controls height
D.Manages stress
Why are vehicles given streamlined shapes?
A.To look attractive
B.To reduce fluid friction
C.To increase speed
D.To reduce cost
What are weeds?
A.Useful plants grown with crops
B.Undesirable plants growing naturally along with crop plants
C.Plants that help crop growth
D.Decorative plants in fields
What should adolescents understand about the changes they experience?
A.They are abnormal
B.They are temporary problems
C.They are natural part of growing up
D.They can be stopped
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
Which mosquito carries the malaria parasite?
A.Male Anopheles mosquito
B.Female Anopheles mosquito
C.Female Aedes mosquito
D.Male Aedes mosquito
What happens to friction when surfaces are pressed harder together?
A.Friction decreases
B.Friction increases
C.Friction remains the same
D.Friction becomes zero
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
What is threshing?
A.Cutting the mature crop
B.Separating grain seeds from chaff
C.Removing weeds from field
D.Watering the crops