CSS - PMS - CCE - PCS - General Science
Light (Optics) - Optical Instruments
What does a simple magnifying glass use?
A. A prism only
B. A convex lens
C. A plane glass slab
D. A concave mirror only
Correct Answer: B
A convex lens can form a magnified virtual image for an object within its focal length.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Optical Instruments
Which optical instrument is used to observe distant astronomical objects?
A. Telescope
B. Ammeter
C. Microscope
D. Stethoscope
Correct Answer: A
Telescopes collect and focus light from distant objects.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Optical Instruments
Which optical instrument is used to view very small nearby objects at high magnification?
A. Periscope
B. Microscope
C. Barometer
D. Telescope
Correct Answer: B
Microscopes use lens systems to magnify small objects.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Mirrors
What law governs reflection from a mirror?
A. Angle of incidence equals angle of reflection
B. Ohm's law
C. Snell's law only
D. Hooke's law
Correct Answer: A
The law of reflection applies to mirror surfaces.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Mirrors
A concave mirror can form what type of image when the object is beyond the focal point?
A. Real and inverted
B. Always virtual and upright
C. No image ever
D. Only same-size virtual
Correct Answer: A
Depending on object distance, concave mirrors can form real inverted images.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Mirrors
A plane mirror forms what type of image?
A. Real and magnified always
B. Virtual, upright and same size
C. Real and inverted
D. Virtual and upside down
Correct Answer: B
Plane mirrors form virtual upright images with unit magnification.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Mirrors
Which mirror gives a wider field of view and is used as a vehicle side mirror?
A. Parabolic dish only
B. Convex mirror
C. Concave mirror
D. Plane mirror only
Correct Answer: B
Convex mirrors form diminished upright virtual images and provide a broad field of view.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Mirrors
Which mirror curves outward?
A. Concave mirror
B. Lens
C. Plane mirror
D. Convex mirror
Correct Answer: D
Convex mirrors diverge reflected rays.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Mirrors
Which mirror has a reflecting surface that curves inward?
A. Prism
B. Convex mirror
C. Concave mirror
D. Plane mirror
Correct Answer: C
A concave mirror is converging for paraxial rays.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Human Eye
What is myopia?
A. Color blindness only
B. Long-sightedness
C. Short-sightedness in which distant objects focus in front of the retina
D. Total absence of a lens
Correct Answer: C
Myopia is commonly corrected with diverging lenses.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Human Eye
Which photoreceptors are especially sensitive in dim light?
A. Rods
B. Cones only
C. Corneal cells
D. Iris cells
Correct Answer: A
Rods are highly sensitive and important for low-light vision.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Human Eye
Which photoreceptors are most responsible for color vision?
A. Lens fibers
B. Rods
C. Cones
D. Ganglion cells only
Correct Answer: C
Cones support color and high-acuity vision, especially in bright light.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Human Eye
Where is the image formed in a normal eye?
A. Iris
B. Optic nerve
C. Cornea only
D. Retina
Correct Answer: D
The retina contains photoreceptors that detect the focused image.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Human Eye
Which part controls the amount of light entering the eye?
A. Vitreous humor only
B. Iris
C. Retina
D. Optic nerve
Correct Answer: B
The iris adjusts pupil size.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Human Eye
Which part of the eye focuses incoming light onto the retina?
A. Sclera
B. Lens
C. Iris only
D. Optic nerve
Correct Answer: B
The cornea and lens refract light, with the lens fine-tuning focus.
CSS - PMS - CCE - PCS - General Science
Heat & Thermodynamics - Thermometers
What property is used in a digital resistance thermometer?
A. Electrical resistance changes with temperature
B. Gravity reverses
C. Mass vanishes with temperature
D. Magnetic poles disappear
Correct Answer: A
Resistance temperature detectors infer temperature from predictable resistance changes.
CSS - PMS - CCE - PCS - General Science
Heat & Thermodynamics - Thermometers
Why is mercury historically useful in thermometers?
A. It has no thermal expansion
B. It freezes at 100°C
C. It is a gas at room temperature
D. It expands fairly uniformly and is easily visible over a useful range
Correct Answer: D
Mercury's predictable expansion made it useful, though safety concerns have reduced its use.
CSS - PMS - CCE - PCS - General Science
Heat & Thermodynamics - Thermometers
Which SI temperature scale uses kelvin?
A. Beaufort scale
B. Kelvin scale
C. Fahrenheit scale
D. Celsius scale only
Correct Answer: B
Kelvin is the SI base unit of thermodynamic temperature.
CSS - PMS - CCE - PCS - General Science
Heat & Thermodynamics - Thermometers
What is absolute zero in Celsius approximately?
A. −273.15°C
B. 273.15°C
C. 0°C
D. −100°C
Correct Answer: A
Absolute zero is 0 K, equal to about −273.15°C.
CSS - PMS - CCE - PCS - General Science
Heat & Thermodynamics - Thermometers
Which temperature scale sets water's freezing point at 0° and boiling point at 100° at standard pressure?
A. Rankine
B. Celsius
C. Fahrenheit
D. Kelvin
Correct Answer: B
The Celsius scale uses 0°C and 100°C for those reference points under standard conditions.