1. : Precise measurement is the one which has
(A) Absolute precision
(B) Less precision
(C) Max precision
(D) Both A and B
2. : Number of significant figures in 0.0010 are
(A) One
(B) Two
(C) Three
(D) Four
3. : Which of the following is a supplementary unit?
(A) Degree
(B) Radian
(C) Steradian
(D) Both B and C
4. : A unit vector is obtained by?
(A) Magnitude
(B) Direction
(C) Scalar-vector
(D) Vector
5. : The angle between two Vectors A and B can be found by
(A) Head to tail rule
(B) Their cross product
(C) Their dot product
(D) Both A and B
6. : The irregular and unsteady flow of fluid are known as?
(A) Turbulent flow
(B) Streamline flow
(C) Normal flow
(D) All of above
7. : The frictional force is present in
(A) Gases
(B) Liquids
(C) Solid
(D) All of above
8. : Drag force depends upon, according to Stoke’s law?
(A) Coefficient of viscosity
(B) Terminal velocity of the body
(C) The radius of the spherical body
(D) All of these
9. : The force that appears as a result of interaction between two moving charges is known as
(A) Magnetic force
(B) Electrostatic force
(C) Induced force
(D) Gravitation force
10. : When a charge passes through a region undeflected, then F(e)=F(m)_______
(A) B parallel to E
(B) B = 0
(C) Both A and B
(D) None
11. : The direction of vectors L×B is
(A) Same as Magnetic field
(B) Same as force
(C) Same as Electric force
(D) Length conduction
12. : Electric current produced magnetic field. This fact was discovered by:
(A) Henry
(B) Maxwell
(C) Oersted
(D) Newton
13. : Parallel lines carrying current in same direction will:
(A) Remain at rest
(B) Repel each other
(C) Attract each other
(D) Start rotating
14. : Cathode ray oscilloscope works by:
(A) Proton
(B) Electron
(C) Muons
(D) Neutrons
15. : What is pressure in the narrow pipe if streamlines are close together?
(A) Smaller
(B) Larger
(C) Remain same
(D) Zero
16. : The power of a concave lens is
(A) Real
(B) Virtual
(C) Positive
(D) Negative
17. : A convex lens gives a virtual image only when the object lies
(A) Between principal focus and center of curvature
(B) Beyond 2f
(C) At the principal focus
(D) Between principal focus and optical center
18. : In going from a denser to a rarer medium, a ray of light is
(A) Un-deviated
(B) Bent away from the normal
(C) Bent towards the normal
Answer: (B) Bent away from the normal
19. : Light signals pass through multimode graded index fiber due to
(A) Continuous refraction
(B) Total internal reflection
(C) Both continuous refraction and total internal reflection
(D) Diffraction
20. : A lens which converges a beam of parallel rays to a point is called
(A) Diverging (or concave) lens
(B) Converging (or convex) lens
(C) Plano-concave lens
(D) Plano-convex lens
21. : When a ray of light passes from one medium to another, it bends due to
(A) Change in speed
(B) Change in frequency
(C) Change in amplitude
(D) Change in phase
22. : The image formed by a convex mirror is always
(A) Real and erect
(B) Real and inverted
(C) Virtual and erect
(D) Virtual and inverted
23. : What is the unit of the focal length of a lens?
(A) Dioptre
(B) Tesla
(C) Henry
(D) Watt
24. : When white light passes through a prism, it splits into seven colours due to
(A) Interference
(B) Reflection
(C) Scattering
(D) Dispersion
25. : The lens used in magnifying glass is a
(A) Concave lens
(B) Convex lens
(C) Cylindrical lens
(D) Plano-concave lens
26. : The change in the direction of light at the interface between two different media is known as
(A) Reflection
(B) Diffraction
(C) Refraction
(D) Dispersion
27. : A prism disperses light due to its property of
(A) Refraction
(B) Polarization
(C) Reflection
(D) Transparency
28. : Light enters from air to glass. Which of the following remains unchanged?
(A) Speed
(B) Frequency
(C) Wavelength
(D) Direction
29. : The part of the human eye that controls the size of the pupil is
(A) Lens
(B) Retina
(C) Cornea
(D) Iris
30. : Which instrument is used to view distant objects?
(A) Microscope
(B) Telescope
(C) Periscope
(D) Binoculars
31. : Which of the following helps in the convergence of light rays?
(A) Concave lens
(B) Plane mirror
(C) Convex lens
(D) None of these
32. : Which of the following phenomena causes the twinkling of stars?
(A) Dispersion of light
(B) Reflection of light
(C) Refraction of light
(D) Scattering of light
33. : Myopia can be corrected by using
(A) Convex lens
(B) Concave lens
(C) Cylindrical lens
(D) Bifocal lens
34. : Which part of the human eye is sensitive to light?
(A) Iris
(B) Cornea
(C) Retina
(D) Pupil
35. : Which of the following phenomena is not a result of refraction of light?
(A) Twinkling of stars
(B) Formation of rainbow
(C) Mirage
(D) Image in a mirror
36. : The power of a lens is measured in
(A) Dioptres
(B) Metres
(C) Watts
(D) Newtons
37. : The phenomenon of bending of light around the corners of an obstacle is called
(A) Refraction
(B) Diffraction
(C) Reflection
(D) Interference
38. : Which mirror is used by dentists to see an enlarged image of teeth?
(A) Convex mirror
(B) Plane mirror
(C) Concave mirror
(D) None of these
39. : Which of the following devices uses a concave mirror?
(A) Rear view mirror
(B) Flashlight
(C) Telescope
(D) Projector
40. : In optics, the term “real image” means
(A) Image cannot be captured on screen
(B) Image can be seen by naked eye only
(C) Image can be obtained on a screen
(D) Image is always erect
41. : What is the focal length of a plane mirror?
(A) Zero
(B) Infinite
(C) 1 cm
(D) 100 cm
42. : The image formed by a plane mirror is
(A) Real and inverted
(B) Virtual and inverted
(C) Real and erect
(D) Virtual and erect
43. : Which lens is used to correct hypermetropia (farsightedness)?
(A) Concave lens
(B) Convex lens
(C) Cylindrical lens
(D) Plane lens
44. : The angle between the incident ray and the reflected ray is called
(A) Angle of incidence
(B) Angle of reflection
(C) Angle of deviation
(D) Twice the angle of incidence
45. : The splitting of white light into seven colours is known as
(A) Reflection
(B) Refraction
(C) Dispersion
(D) Scattering
46. : Which part of the eye controls the size of the pupil?
(A) Cornea
(B) Iris
(C) Retina
(D) Lens
47. : In which of the following mediums does light travel the fastest?
(A) Glass
(B) Water
(C) Air
(D) Vacuum
48. : Which of the following phenomena proves the wave nature of light?
(A) Reflection
(B) Refraction
(C) Interference
(D) Absorption
49. : Which device is used to split light into its component colors?
(A) Mirror
(B) Prism
(C) Lens
(D) Microscope
50. : Which type of lens is thicker at the center than at the edges?
(A) Concave lens
(B) Convex lens
(C) Plane lens
(D) None of the above