Optical Instruments, Microscopes, Telescopes, converging lenses, diverging lenses.
Embark on a journey into the realm of optical instruments with Nokryan.com! Optical instruments play a vital role in enabling us to explore the hidden dimensions of the universe and the microscopic marvels of the world. Start your adventure by uncovering the impressive capabilities of microscopes, which expose the intricate details of tiny organisms and structures that are not visible to the naked eye. Transition to telescopes and be amazed by their capacity to enlarge distant celestial objects, unveiling the stunning beauty of the cosmos. Delve into the captivating characteristics of converging lenses, which merge parallel light rays to create clear and enlarged images, an essential feature for both microscopes and telescopes. Let Nokryan.com be your trusted companion on this fascinating journey.
1. The different parts of spectrometer
- Turn table
- Telescope
- All of thesecorrect
- Collimator
2. When an image formed by the objective lies at the focus of both the objective and the eye-piece, the telescope is said to be in Final adjustment
- Normal adjustment
- None of these
- Initial adjustment
correct
Normal adjustment
3. Turn table is the plate form over which we place
- Different grating
- All of thesecorrect
- Glass slab
- Prism
4. In normal adjustment, the length of the telescope is
- fee + f₀
correct - fee – f₀
- None of these
- f₀ – fee
5. A simple telescope is consists of
- None of these
- Three convex lenses
correct - One convex lens
- Two convex lenses
6. When an image is placed at the focal length of the eye piece, the final image formed at
- 2 F
- 6 F
- Infinity
correct - 4 F
7. The image formed after objective lens of an astronomical telescope is
- All of thesecorrect
- Diminished
- Real
- Inverted
8. Telescope is an optical device used for viewing
- Distant objects
- b and c
- Near object
- Not far distance
correct
9. If the magnification M₁ = 20.0 for objective and M₂ = 12.0 then total magnification is
- 240
- 200
- 280
- 260correct
10. The function of collimator is
- To make the parallel rays from source
correct - In which the source of light is kept
- To converge the incoming rays
- None of these
11. A microscope has an objective lens of 10 mm focal length and an eye piece of 25.0 mm focal length what is the distance between the lenses
- ≈ 213mm
- ≈ 200 mm
- ≈210mm
- ≈233mm
correct
12. Spectrometer can measure quite accurately prism
- Angle of prism
- Deviation of light by a glass prism
- Refractive index of the material
- None of thesecorrect
13. If the focal length of eye piece is 25.0 mm find its magnification
- -11.0
- 14.0
correct - -13.0
- 12.0
14. In viewing the distant objects the angle subtended at the telescope is
- Bigger
- None of these
- Very large
correct - Smaller
15. Magnifying power of a astronomical telescope in normal adjustment is
- M =f/fee
- M = fee/f₀
- M = f₀/feecorrect
- M = fee/f
16. If the focal length of objective is 10 mm find its magnification
- 18
- 21
- 20
- 19
correct
17. In an astronomical telescope the eye piece has the focal length fee is
- Extremely long
- Short
correct
None of these- Long
18. A spectrometer is an optical device used to study the spectra from different sources of light which is
- Emission spectra
- Discrete spectracorrect
- None of these
- Absorption spectra
19. In an astronomical telescope is the objective has the focal length f₀ is
- Very smallcorrect
- None of these
- Long
- Small
20. Spectrometer using diffraction grating can measure
- Wavelength of lightcorrect
- Frequency of light
- Intensity of light
- None of these
Entry Test 2021 Physics Optical Instruments MCQS Online Preparation Sample Paper 2 Questions with Answer
1. The speed of light in other material is always
- Equal to c
- Greater than c
- None of these
- Less than c
correct
2. A wide objective and the use of blue light of short wavelength produces
- Diffraction
- Interference
- Less diffraction
correct - Polarization
3. The time taken by the mirror M to rotate through an angle 2π/8 is
- 1/8 f
correct - ½ f
- ¼ f
- 1/16 f
4. A double convex lens acts as a diverging lens when the object is
- Between f and 2f
- At the focus
- All of these
- Inside the focus
correct
5. The refracting edge of the prism must be parallel to the axis of rotation of the telescope, so that the turn table is leveled using
- Screws of the spectrometer
- Leveling screwscorrect
- None of these
- Turn table screw
6. A circular scale is attached and graduated in
- None of these
- Half degree
correct - Two degree
- One degree
7. An image formed by a concave lens is always
- Inverted
- Real
- Virtual
correct - None of these
8. Photo phone was invented by
- Graham Bellcorrect
- None of these
- Bardeen
- Edison
9. The time taken by light for its passage from M to m and back is
- 2c/d
- d²/2c
- d/2c
- 2d/c
correct
10. Who attempted to measure the speed of light
- Newton
- None of these
- Gallilco
correct - Michelson
11. The resolution of microscope depends on objective’s
- Material
- Diametercorrect
- Focal length
None of these
12. A telescope is rotatable about the same vertical axis as the turntable, with a scale which is
- Main scale
- Vernier scale
correct - Half degree scale
- None of these
13. Graham Ball photo phone used a modulated beam of
- Diffracted sun light
- Refracted sun light
- None of these
- Reflected sun light
correct
14. The advantage / advantages of fiber optics than radio wave carriers
- Much wider band width
- Immunity
- All of these
correct - Capability
15. Angle subtended by any side of the eight-sided mirror at the centre is
- 2π/4
- 2π/8
correct - π/8
- π/4
16. Fiber optics also used to transmit light
- Formerly unobservable objects
- Around corners
- All of thesecorrect
- Into inaccessible place
17. Fire optics has ability to transmit
- Numerous data signals between stations
- All of thesecorrect
- Several television programs
- Thousand telephone conversation
18. At certain speed, the time taken by light in moving from M to m and back to M is equal to the time taken by
- Face 4 to 1
- Face 6 to 1
- Face 3 to 1
- Face 2 to 1correct
19. The minimum distance between an object and its image in convex lens is
- 2.5 f
correct - 2 f
- 3.5 f
- 3 f
20. In photo phone modulated beam of reflected sun light focused on a detector several hundred meters away with the device
- None of these
- Germanium
- Silicon
- Selinium
correct