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