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WorksheetsY9 PHYSICS QUIZ
Total questions: 34
Worksheet time: 17mins
What is the unit of electric charge?
Ampere (A)
Volt (V)
Coulomb (C)
Ohm (Ω)
Which of the following is true about the charges on a proton and an electron?
Both have the same charge.
A proton is positive, and an electron is negative.
A proton is negative, and an electron is positive.
Both are neutral.
When a polythene rod is rubbed with a cloth, it becomes negatively charged. What is transferred during this process?
Protons
Neutrons
Electrons
Positrons
Two charged objects repel each other. What can be concluded about their charges?
One is positive, and the other is negative.
Both have the same type of charge.
One is charged, and the other is neutral.
They must both be negative.
What happens when a positively charged rod is brought near a neutral conductor?
The conductor becomes negatively charged.
The conductor becomes positively charged.
Electrons in the conductor move towards the rod.
Protons in the conductor move away from the rod.
Which of the following materials is a good electrical conductor?
Plastic
Wood
Copper
Rubber
What is the charge on an atom that has lost two electrons?
-2
+2
0
-1
What is the process called when a charged object causes charges to separate in a neutral object without touching it?
Conduction
Induction
Friction
Polarization
Which of the following lists electromagnetic waves in order of increasing wavelength?
Gamma rays → X-rays → Visible light → Radio waves
Radio waves → Visible light → X-rays → Gamma rays
Visible light → X-rays → Radio waves → Gamma rays
X-rays → Gamma rays → Radio waves → Visible light
Which electromagnetic wave is used for satellite communications?
X-rays
Infrared
Microwaves
Ultraviolet
Which type of electromagnetic wave has the highest frequency?
Radio waves
Ultraviolet
Gamma rays
Infrared
Which of the following is a use of infrared radiation?
Sterilizing medical equipment
Heating food
Mobile phone signals
Detecting broken bones
Why are ultraviolet (UV) waves dangerous?
They can cause skin cancer.
They can heat up objects.
They interfere with radio signals.
They have no known dangers.
Which electromagnetic wave is used in medical imaging to see bones?
Radio waves
X-rays
Visible light
Microwaves
What is the speed of all electromagnetic waves in a vacuum?
300,000 km/s
3,000 m/s
330 m/s
Changes depending on the wave
Which type of wave is used in remote controls for TVs?
Radio waves
Infrared
Ultraviolet
Gamma rays
Which electromagnetic waves are absorbed by the ozone layer?
Microwaves
Ultraviolet
Visible light
X-rays
What is the main hazard of prolonged exposure to microwaves?
Skin burns
Internal heating of body tissues
Radiation poisoning
No known hazards
Why do different electromagnetic waves have different effects on matter?
They travel at different speeds.
They have different wavelengths and energies.
They are produced by different sources.
They are all the same.
What type of wave is light?
Longitudinal
Transverse
Mechanical
Sound
When light travels from air into glass, its speed:
Increases
Decreases
Stays the same
Becomes zero
The refractive index of a material is defined as:
Speed of light in vacuum / Speed of light in material
Speed of light in material / Speed of light in vacuum
Wavelength in vacuum / Wavelength in material
Frequency in material / Frequency in vacuum
If the angle of incidence is 30° and the angle of refraction is 20°, what is the refractive index of the second medium?
0.66
1.46
1.50
2.00
The critical angle occurs when the angle of refraction is:
0°
45°
90°
180°
What is the critical angle for water (n = 1.33)?
41.2°
48.8°
62.5°
90°
Total internal reflection can only occur when light travels:
From air to water
From water to air
From glass to diamond
Through a vacuum
Which diagram shows correct refraction at a boundary? (Assume light moves from air to glass.)
Bends away from normal
Bends towards normal
No bending
Reflects back
A light ray enters glass (n = 1.5) from air at 45°. What is the angle of refraction?
18.2°
28.1°
45°
90°
Which application uses total internal reflection?
Microwave oven
Optical fiber
X-ray imaging
Loudspeaker
If the speed of light in a medium is 2 × 10⁸ m/s, its refractive index is:
0.67
1.00
1.50
2.00
A prism disperses white light because different colors have different:
Speeds in glass
Frequencies
Critical angles
All of the above
The angle between the incident ray and the normal is called:
Angle of reflection
Angle of refraction
Angle of incidence
Critical angle
Which statement about the critical angle is true?
It increases with higher refractive index.
It equals 90° for all materials.
It only occurs in gases.
It causes light to refract at 90°.
Light travels from glass (n=1.5) to air (n=1). If the angle of incidence is 40°, does total internal reflection occur? (Given: Critical angle for glass = 41.8°)
Yes
No
