1. What principle explains why a boat floats on water?
a) Newton’s First Law
b) Archimedes’ Principle
c) Bernoulli’s Principle
d) Law of Conservation of Energy
Answer: b) Archimedes’ Principle
2. Which of the following is an example of using the principle of leverage in daily life?
a) Using a wheelbarrow
b) Using a vacuum cleaner
c) Riding a bicycle
d) Using a microwave oven
Answer: a) Using a wheelbarrow
3. What is the primary reason for the use of airbags in cars?
a) To reduce friction
b) To increase acceleration
c) To reduce the impact force during a collision
d) To improve the vehicle’s speed
Answer: c) To reduce the impact force during a collision
4. Why do we feel cooler when we sweat?
a) Because sweat absorbs heat from the body
b) Because sweat causes friction on the skin
c) Because sweat reflects sunlight
d) Because sweat increases body temperature
Answer: a) Because sweat absorbs heat from the body
5. How does a refrigerator use the principles of thermodynamics to keep food cool?
a) By increasing the temperature inside
b) By transferring heat from the inside to the outside
c) By converting heat into electrical energy
d) By reducing the humidity inside
Answer: b) By transferring heat from the inside to the outside
6. What principle is utilized by a car’s brakes to slow down the vehicle?
a) Newton’s Third Law
b) Law of Conservation of Momentum
c) Friction
d) Centripetal Force
Answer: c) Friction
7. Why do ice cubes float in a glass of water?
a) Ice is denser than water
b) Water is denser than ice
c) Ice has a lower density than water
d) Ice melts when it floats
Answer: c) Ice has a lower density than water
8. How does a microwave oven heat food?
a) By conduction
b) By convection
c) By radiation
d) By reflection
Answer: c) By radiation
9. What is the role of a fuse in electrical appliances?
a) To increase electrical current
b) To prevent overheating by breaking the circuit when excessive current flows
c) To store electrical energy
d) To amplify electrical signals
Answer: b) To prevent overheating by breaking the circuit when excessive current flows
10. How does a lever make it easier to lift heavy objects?
a) By increasing the force applied
b) By changing the direction of the force applied
c) By increasing the distance over which the force is applied
d) By decreasing the distance over which the force is applied
Answer: c) By increasing the distance over which the force is applied
11. Why do cars have shock absorbers?
a) To increase friction
b) To reduce the impact of road bumps and vibrations
c) To improve the car’s speed
d) To enhance fuel efficiency
Answer: b) To reduce the impact of road bumps and vibrations
12. What is the reason for the curvature of the lenses in eyeglasses?
a) To improve the color of vision
b) To magnify objects
c) To correct vision by refracting light properly onto the retina
d) To reduce the amount of light entering the eyes
Answer: c) To correct vision by refracting light properly onto the retina
13. How does a thermostat regulate room temperature?
a) By increasing electrical resistance
b) By controlling the flow of air
c) By switching heating or cooling systems on and off based on temperature changes
d) By altering the pressure of the room
Answer: c) By switching heating or cooling systems on and off based on temperature changes
14. Why does a parachute slow down a skydiver’s fall?
a) By increasing the speed of descent
b) By decreasing air resistance
c) By increasing air resistance
d) By increasing gravitational pull
Answer: c) By increasing air resistance
15. What phenomenon causes the bending of light as it passes through water, creating a rainbow effect?
a) Reflection
b) Refraction
c) Diffraction
d) Dispersion
Answer: d) Dispersion