Science Class 6th
461. Angle of incidence and angle of reflection are on _______ sides of the normal.
A. Same
B. Opposite
C. All of these
462. Normal is an imaginary line at _________ angle.
A. Obtuse
B. Acute
C. Right
D. None of these
463. Incident ray, reflected ray, and normal lie in ______ plane.
A. Same
B. Different
C. Some times same
D. None of these
464. Angle of incidence is ________ to angle of reflection.
A. Greater
B. Lesser
C. Equal
D. None of these
465. Laws of reflection were first described by?
A. Avicena
B. Jabir
C. Al Khawrizmi
D. Ibn ul Haitham
466. An object producing light is called ________ object. a. Non luminous
A. Non luminous
B. Luminous
C. Both ‘a’ and ‘b’
467. An object which doesn’t produce light is called?
A. Non Luminous
B. Luminous
C. None
468. In plane mirror, ________ reflection occurs.
A. Regular
B. Irregular
C. Both ‘a’ and ‘b’
D. None
469. _______ reflection is reflection in which rays are reflected parallel and angle of incidence is equal to angle of reflection.
A. Diffused
B. Regular
C. None
470. ____ reflection occurs in papers and wall.
A. Diffused
B. Regular
C. None
471. When rays of light after striking an irregular surface scatter indifferent directions, the reflection is called ______ reflection.
A. Regular
B. Diffused
C. None
472. Diffused reflection is also called?
A. Regular reflection
B. Diffused
C. Irregular reflection
D. None of these
473. Moon is ______ object.
A. Luminous
B. Non Luminous
C. None of these
474. Moon can be seen because of?
A. Irregular reflection
B. Regular reflection
C. Both ‘a’ and ‘b’
D. None
475. We receive light at dawn or after sun set due to _______ reflection.
A. Regular
B. Irregular
C. None of these
476. The plane surface on which regular reflection occurs is called ______ surface.
A. Smooth
B. Rough
C. Both ‘a’ and ‘b’
D. None of these
477. Smooth surface are also called ......... surfaces.
A. Smooth
B. Polished
C. Regular
D. All of these
478. Which of the following are smooth surfaces?
A. Plane mirror
B. Still water
C. Both ‘a’ and ‘b’
D. None
479. Uneven surfaces giving diffused reflection is called ______ surfaces.
A. Irregular
B. Rough
C. Both ‘a’ and ‘b’
D. None
480. Which of the following are rough surfaces?
A. Paper
B. Wall
C. Cardboard
D. All of these