Physics in daily life

The SI unit of force is the:

• 1 Newton
• 2 Joule
• 3 Pascal
• 4 Watt

Sound cannot travel through:

• 1 Air
• 2 Water
• 3 A vacuum
• 4 Steel

The speed of light in a vacuum is about:

• 1 340 m/s
• 2 3 × 10⁸ m/s
• 3 3 × 10⁶ m/s
• 4 3 × 10⁵ m/s

A person standing in front of a plane mirror sees an image that is:

• 1 Real and larger
• 2 Real and smaller
• 3 Virtual and the same size
• 4 Virtual and inverted

The device used to convert alternating current to direct current is a:

• 1 Transformer
• 2 Capacitor
• 3 Rectifier
• 4 Generator

The energy stored in a stretched spring is:

• 1 Kinetic energy
• 2 Chemical energy
• 3 Elastic potential energy
• 4 Thermal energy

Which colour of visible light has the longest wavelength?

• 1 Red
• 2 Green
• 3 Violet
• 4 Blue

A fuse in an electric circuit protects it by:

• 1 Increasing the voltage
• 2 Storing charge
• 3 Melting when the current is too large
• 4 Reducing the frequency

Water freezes at what temperature on the Celsius scale?

• 1 100 °C
• 2 -10 °C
• 3 0 °C
• 4 32 °C

The instrument used to measure atmospheric pressure is the:

• 1 Anemometer
• 2 Hygrometer
• 3 Barometer
• 4 Thermometer

The unit of electric current is the:

• 1 Volt
• 2 Watt
• 3 Ampere
• 4 Ohm

Which mirror is used by a dentist to see a magnified image of a tooth?

• 1 Concave mirror
• 2 Convex mirror
• 3 Plane mirror
• 4 Cylindrical mirror

The vehicle rear view mirror is a:

• 1 Convex mirror
• 2 Lens
• 3 Plane mirror
• 4 Concave mirror

The speed of sound in air at room temperature is about:

• 1 3000 m/s
• 2 34 m/s
• 3 300,000 m/s
• 4 340 m/s

Which colour has the shortest wavelength in the visible spectrum?

• 1 Green
• 2 Violet
• 3 Red
• 4 Yellow

The unit of power is the:

• 1 Joule
• 2 Pascal
• 3 Newton
• 4 Watt

A body floats in a liquid when its density is:

• 1 Less than that of the liquid
• 2 Zero only
• 3 More than that of the liquid
• 4 The same as air

Rainbows are caused by the:

• 1 Dispersion of sunlight in water drops
• 2 Interference in air
• 3 Reflection from clouds only
• 4 Absorption by dust

Which of these is a vector quantity?

• 1 Mass
• 2 Speed
• 3 Temperature
• 4 Velocity

The device that converts mechanical energy into electrical energy is a:

• 1 Motor
• 2 Generator
• 3 Battery
• 4 Transformer

Heat from the Sun reaches the Earth mainly by:

• 1 Evaporation
• 2 Conduction
• 3 Radiation
• 4 Convection

The SI unit of frequency is the:

• 1 Joule
• 2 Decibel
• 3 Newton
• 4 Hertz