physics Archives

41. Rainbow is seen after rain because of hanging molecules of water which act as A. Lenses B. Mirrors C. Prisms D. Slabs

Lenses

Mirrors

Prisms

Slabs

Detailed SolutionRainbow is seen after rain because of hanging molecules of water which act as A. Lenses B. Mirrors C. Prisms D. Slabs

42. The illuminating powers of two sources are compared by A. A spectrometer B. A photometer C. A polarimeter D. A fluxmeter

A spectrometer

A photometer

A polarimeter

A fluxmeter

Detailed SolutionThe illuminating powers of two sources are compared by A. A spectrometer B. A photometer C. A polarimeter D. A fluxmeter

43. Which of the following cannot be used for making lenses? A. Plastic B. Soil C. Glass D. Water

Plastic

Soil

Glass

Water

Detailed SolutionWhich of the following cannot be used for making lenses? A. Plastic B. Soil C. Glass D. Water

44. The final image in a simple microscope is A. Real, diminished and inverted B. Real, magnified and erect C. Virtual, magnified and erect D. Virtual, diminished and erect

Real, diminished and inverted

Real, magnified and erect

Virtual, magnified and erect

Virtual, diminished and erect

Detailed SolutionThe final image in a simple microscope is A. Real, diminished and inverted B. Real, magnified and erect C. Virtual, magnified and erect D. Virtual, diminished and erect

45. Which microscope is often used to view metal surfaces? A. Optical microscopes B. Scanning tunneling microscopes C. Electron microscopes D. None of the above

Optical microscopes

Scanning tunneling microscopes

Electron microscopes

None of the above

Detailed SolutionWhich microscope is often used to view metal surfaces? A. Optical microscopes B. Scanning tunneling microscopes C. Electron microscopes D. None of the above

46. Lens is made up of which glass A. Ordinary glass B. Pyrex glass C. Flint glass D. Cobalt glass

Ordinary glass

Pyrex glass

Flint glass

Cobalt glass

Detailed SolutionLens is made up of which glass A. Ordinary glass B. Pyrex glass C. Flint glass D. Cobalt glass

47. Fiber optics cable used in communication, works on the principle of A. Regular reflection of light B. Diffuse reflection of light C. Refraction of light D. Total internal reflection of light

Regular reflection of light

Diffuse reflection of light

Refraction of light

Total internal reflection of light

Detailed SolutionFiber optics cable used in communication, works on the principle of A. Regular reflection of light B. Diffuse reflection of light C. Refraction of light D. Total internal reflection of light

48. A simple microscope consists of : A. A short focus convex lens B. A long focus convex lens C. A short focus concave lens D. A long focus concave lens

A short focus convex lens

A long focus convex lens

A short focus concave lens

A long focus concave lens

Detailed SolutionA simple microscope consists of : A. A short focus convex lens B. A long focus convex lens C. A short focus concave lens D. A long focus concave lens

49. Person who is colourblind cannot distinguish between A. Black and yellow B. Red and green C. Yellow and white D. Green and blue

Black and yellow

Red and green

Yellow and white

Green and blue

Detailed SolutionPerson who is colourblind cannot distinguish between A. Black and yellow B. Red and green C. Yellow and white D. Green and blue

50. In a Cinema hall, the distance between the projector and the screen is increased by 2%. Then the intensity of illumination on the screen is A. Decreased by 2% B. Decreased by 4% C. Increased by 2% D. Increased by 4%

Decreased by 2%

Decreased by 4%

Increased by 2%

Increased by 4%

Detailed SolutionIn a Cinema hall, the distance between the projector and the screen is increased by 2%. Then the intensity of illumination on the screen is A. Decreased by 2% B. Decreased by 4% C. Increased by 2% D. Increased by 4%