Science Class 6th

481. We are able to see our image in mirror due to ________ reflection.

A. Regular

B. Irregular

C. None

482. We can turn sun light towards dark areas with the help of ______ reflection from shining surfaces.

A. Irregular

B. Regular

C. None of these

483. We can see things in rooms , despite the fact that sun light doesn’t directly enters our room, due _________ reflection.

A. Diffused

B. Regular

C. None of these

484. A shiny surface is called _______.

A. Light

B. Bulb

C. Sun

D. Mirror

485. ______ mirror has polished surface and a coating of silver or aluminum on one side.

A. Plane

B. Light mirror

C. Diffused angle

D. None of these

486. An image we can obtain on screen is called _______ image.

A. Real

B. Fake

C. Virtual

D. None of these

487. An image which we can’t obtain on screen is called _____ image.

A. Real

B. Fake

C. Virtual

D. None

488. The following are features of image formed by plane mirror:

A. Image equal in size to object

B. Upright image

C. Virtual

D. All of the above

489. The image formed by plane mirror is _______.

A. Upside down

B. Laterally inverted

C. None of these

490. Pinhole camera work on the principle that light travels in ________ lines.

A. Straight

B. Zigzag

C. None of these

491. Speed of light in air is?

A. 3*1010 m/s

B. 3*108 m/s

C. Both ‘a’ and ‘b’

D. None of these

492. Pinhole camera was invented by?

A. Al Razi

B. Ibn ul Haitham

C. Jabir

D. None

493. In pinhole camera, a _______ screen is fixed at opposite end of the box.

A. Translucent

B. Smooth

C. Shiny

D. None

494. All inside walls in the box of pinhole camera are made _____ so that light can’t enter.

A. White

B. Red

C. Black

D. None

495. A ______ pinhole will give you sharp image.

A. Light

B. Small

C. Large

D. None

496. A _______ pinhole will give you blur picture.

A. Large

B. Small

C. None

497. Good pictures on pinhole camera can be obtained by pasting some ________ plate inside translucent screen .

A. Shiny

B. Sharp

C. Photographic

D. None

498. Which of the following are properties of image formed by pinhole camera?

A. Real image

B. Inverted

C. Same color

D. All of these

499. A ______ is an instrument with the help of which objects can be seen higher than the level of our eyes.

A. Mirror

B. Pinhole camera

C. Periscope

D. None

500. A simple periscope consists of two plane mirror at _____ in a tube.

A. 50o

B. 45o

C. 60o

D. None of these