Physics · Chapter 8 of 11
Optics: BPSC & UPPCS Prelims PYQs
26 previous-year questions on Optics. Each one opens to its answer and explanation.
The focal distance of a plane mirror is
- A-1 cm
- B+1 cm
- C2 cm
- DInfinity
As the diameter of objective lens of a telescope increases, the resolution of telescope
- ARemains same
- BDepends on focal length of lens
- CIncreases
- DDecreases
Which of the following is responsible for production of shadow?
- APolarisation
- BRectilinear propagation of light
- CDiffraction
- DInterference
The image formed by concave mirror is real, inverted and of the same size as that of the object. The position of the object should be
- Aat the focus
- Bat the centre of curvature
- Cbetween the focus and centre of curvature
- Dbeyond the centre of curvature
Match List-I (Colour) with List-II (Combination):
List-I (Colour) List-II (Combination) (a) Magenta 1. Green and blue (b) Teal 2. Red and blue (c) Mauve 3. Blue, green and white (d) Cyan 4. Blue, red and white - Aa-2, b-3, c-4, d-1
- Ba-2, b-4, c-3, d-1
- Ca-4, b-2, c-1, d-3
- Da-3, b-4, c-2, d-1
Large number of thin strips of black paint are made on the surface of a convex lens of focal length 20 cm to catch the image of a white horse. The image will be
- Aa horse of less brightness
- Ba zebra of black stripes
- Ca horse of black stripes
- DMore than one of the above
- ENone of the above
What type of lens is used in magnifying glass?
- APlano-concave lens
- BConvex lens
- CConvex mirror
- DConcave lens
- ENone of the above/More than one of the above
The speed of light will be minimum while passing through
- AVacuum
- Bair
- Cglass
- Dwater
- ENone of the above/More than one of the above
A person standing in front of a mirror finds his image larger than himself. This implies that the mirror is
- Aconcave
- Bplane
- Cconvex
- Dcylindrical with bulging side outwards
- ENone of the above/More than one of the above
Twinkling of stars in clear sky during nighttime can be explained with
- Arefraction of light
- Breflection of light
- Cpolarization of light
- Dinterference of light
- ENone of the above/More than one of the above
When a soap film on the water is seen in the daytime, it shows beautiful colors. This phenomenon is due to
- Adiffraction of light
- Brefraction of light
- Cpolarization of light
- Dinterference of light
- ENone of the above/More than one of the above
Diffusion of light in the atmosphere takes place due to
- ACarbon dioxide
- BDust Particles
- CHelium
- DWater vapours
Which of the following types of glass can cut off ultraviolet rays?
- ASoda glass
- BPyrex glass
- CJena glass
- DCrookes Glass
Which of the following does not change when light travels from one medium to another?
- AVelocity
- BWavelength
- CFrequency
- DRefractive index
- ENone of the above / More than one of the above
The sunlight from the sun to the earth reaches in
- A5 minutes approx
- B6 minutes approx
- C8 minutes approx
- D10 minutes approx
- ENone of the above / More than one of the above
The phenomenon used in optical fibre for transmission of light energy is
- ATotal internal reflection
- BDiffraction
- CScattering
- DRefraction
Which of the following electromagnetic radiations has the maximum energy?
- AVisible light
- BInfrared rays
- CUltraviolet rays
- DX - Rays
A cut diamond shines brilliantly due to
- Asome inherent property
- Btotal internal reflection
- Cits molecular structure
- Dabsorption of light
The minimum distance of clear vision for a normal healthy eye of human being is supposed to be
- A50 cm
- B10 cm
- C15 cm
- D25 cm
A person with vision defect 'Myopia' can see _______.
- Anearby objects clearly
- Bdistant objects clearly
- Cnearby as well as distant objects clearly
- Dneither nearby nor distant objects clearly
The mirror used by the dentists to see the teeth of the patients is
- AConvex
- BConcave
- CPlane
- DNone of the above
Blue color of the sky is due to
- AScattering of light
- BDispersion of light
- CInterference of light
- DEmission of more blue light as compared to other colours by the sun
To look total image of a person, the minimum height of a plane mirror is
- AEqual to the height of a person
- BHalf of the height of a person
- COne fourth of the height of a person
- DTwo times the height of a person
The mirror used by a dentist to examine the teeth of patients is
- AConcave
- BConvex
- CPlane
- DCylindrical
The reason of mirage is
- AInterference of light
- BDiffraction of light
- CPolarisation of light
- DTotal internal reflection of light
The colour of light is determined by its
- AAmplitude
- BWavelength
- CIntensity
- DVelocity
All 11 chapters of Physics
- Units12 questions
- Motion11 questions
- Gravitation3 questions
- Energy4 questions
- Fluids7 questions
- Thermo17 questions
- Waves16 questions
- Optics26 questions
- Electricity20 questions
- Magnetism9 questions
- Modern Physics19 questions