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Physics in daily life
Government jobs · Everyday science · 22 سوالات
نام: ____________________ تاریخ: ____________
The SI unit of force is the:
- A Newton
- B Joule
- C Pascal
- D Watt
Sound cannot travel through:
- A Air
- B Water
- C A vacuum
- D Steel
The speed of light in a vacuum is about:
- A 340 m/s
- B 3 × 10⁸ m/s
- C 3 × 10⁶ m/s
- D 3 × 10⁵ m/s
A person standing in front of a plane mirror sees an image that is:
- A Real and larger
- B Real and smaller
- C Virtual and the same size
- D Virtual and inverted
The device used to convert alternating current to direct current is a:
- A Transformer
- B Capacitor
- C Rectifier
- D Generator
The energy stored in a stretched spring is:
- A Kinetic energy
- B Chemical energy
- C Elastic potential energy
- D Thermal energy
Which colour of visible light has the longest wavelength?
- A Red
- B Green
- C Violet
- D Blue
A fuse in an electric circuit protects it by:
- A Increasing the voltage
- B Storing charge
- C Melting when the current is too large
- D Reducing the frequency
Water freezes at what temperature on the Celsius scale?
- A 100 °C
- B -10 °C
- C 0 °C
- D 32 °C
The instrument used to measure atmospheric pressure is the:
- A Anemometer
- B Hygrometer
- C Barometer
- D Thermometer
The unit of electric current is the:
- A Volt
- B Watt
- C Ampere
- D Ohm
Which mirror is used by a dentist to see a magnified image of a tooth?
- A Concave mirror
- B Convex mirror
- C Plane mirror
- D Cylindrical mirror
The vehicle rear view mirror is a:
- A Convex mirror
- B Lens
- C Plane mirror
- D Concave mirror
The speed of sound in air at room temperature is about:
- A 3000 m/s
- B 34 m/s
- C 300,000 m/s
- D 340 m/s
Which colour has the shortest wavelength in the visible spectrum?
- A Green
- B Violet
- C Red
- D Yellow
The unit of power is the:
- A Joule
- B Pascal
- C Newton
- D Watt
A body floats in a liquid when its density is:
- A Less than that of the liquid
- B Zero only
- C More than that of the liquid
- D The same as air
Rainbows are caused by the:
- A Dispersion of sunlight in water drops
- B Interference in air
- C Reflection from clouds only
- D Absorption by dust
Which of these is a vector quantity?
- A Mass
- B Speed
- C Temperature
- D Velocity
The device that converts mechanical energy into electrical energy is a:
- A Motor
- B Generator
- C Battery
- D Transformer
Heat from the Sun reaches the Earth mainly by:
- A Evaporation
- B Conduction
- C Radiation
- D Convection
The SI unit of frequency is the:
- A Joule
- B Decibel
- C Newton
- D Hertz
جوابی کلید
1. A, 2. C, 3. B, 4. C, 5. C, 6. C, 7. A, 8. C, 9. C, 10. C, 11. C, 12. A, 13. A, 14. D, 15. B, 16. D, 17. A, 18. A, 19. D, 20. B, 21. C, 22. D
Force is measured in newtons: 1 N = 1 kg m/s².
Sound is a mechanical wave and needs a medium, so it cannot travel in a vacuum.
Light travels about 300,000 km each second in a vacuum.
A plane mirror forms a virtual, upright image of the same size.
A rectifier, usually made of diodes, changes AC into DC.
A stretched or compressed spring stores elastic potential energy.
Red has the longest wavelength, and violet has the shortest.
The fuse wire melts if the current exceeds its rating and so breaks the circuit.
Pure water freezes at 0 °C at normal pressure.
A barometer measures air pressure.
Current is measured in amperes.
A concave mirror gives an enlarged upright image when the object is close.
A convex mirror gives a wide field of view.
Sound travels at about 340 m/s in air at 20 °C.
Violet is at the short wavelength end.
Power is energy per second, measured in watts.
A body floats if it is less dense than the liquid.
Water drops refract, reflect and disperse sunlight into its colours.
Velocity has both magnitude and direction.
A generator uses electromagnetic induction.
Radiation can travel through the vacuum of space.
One hertz is one cycle per second.