Revision for Half Yearly Science

All electromagnetic waves have the same

A         speed.

B         frequency.

C         energy.

D            wavelength.

• A

• B

• C

• D

Which of the following waves has the lowest frequency?

A         an AM radio wave of wavelength 600 m.

B         an FM radio wave of wavelength 8.7 m.

C         a microwave of wavelength 5 mm.

D            a radar wave of wavelength 9 cm.

• A

• B

• C

• D

The series of waves shown below was produced in 20 seconds.

State the:

a          wavelength

b             amplitude of the waves.

• wavelength 10mm and amplitude 30mm

• wavelength 10mm and amplitude 15mm

• Wavelength 5mm and amplitude 30mm

• wavelength 5mm and amplitude 15mm

Select the correct statement from the alternatives below.

A         Infrared radiation has a smaller wavelength than that of the visible spectrum.

B         Microwaves have greater frequency than radio waves.

C         Ultraviolet light has a smaller wavelength than infrared radiation.

D            Gamma rays are lower in frequency than X-rays.

• A

• B

• C

• D

• 2.5m

• 46240m

• 0.4m

• 0.05m

Your hand feels cold as an ice-block melts on it. Identify the correct explanation for this process.

A         Heat has transferred from the ice-block into your hand by conduction.

B         Heat has transferred from your hand to the ice-block by conduction.

C         Heat has transferred from the ice-block into your hand by radiation.

D         Heat has transferred from your hand to the ice-block by radiation.

• A

• B

• C

• D

Sound is a longitudinal wave. This means that its particles

A         vibrate back and forth.

B         move along in the direction of the wave.

C         rotate from side to side.

D            do not move at all.

• A

• B

• C

A metal pole attached to a net used to clean a pool looks bent when it is standing up inside a pool. The process that explains why this happens is called

A         reflection.

B         total internal reflection.

C         refraction.

D         transmission.

• A

• B

• C

• D

The age bracket when females tend to suffer the greatest percentage hearing loss is

A         6–18.

B         19–44.

C         46–64.

D            65+

• A

• B

• C

• D

The law of reflection states that the angle of incidence is equivalent to the angle of reflection. Given this information, select the reflected ray from those shown in the diagram below:

A         ray 1

B         ray 2

C         ray 3

D            ray 4

• A

• B

• C

• D