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Science Class 6th

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

A. Regular

B. Irregular

C. None

Answer
A

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

Answer
B

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

Answer
A

484. A shiny surface is called _______.

A. Light

B. Bulb

C. Sun

D. Mirror

Answer
D

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

Answer
A

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

A. Real

B. Fake

C. Virtual

D. None of these

Answer
A

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

A. Real

B. Fake

C. Virtual

D. None

Answer
C

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

Answer
D

489. The image formed by plane mirror is _______.

A. Upside down

B. Laterally inverted

C. None of these

Answer
B

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

A. Straight

B. Zigzag

C. None of these

Answer
A

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

Answer
B

492. Pinhole camera was invented by?

A. Al Razi

B. Ibn ul Haitham

C. Jabir

D. None

Answer
B

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

A. Translucent

B. Smooth

C. Shiny

D. None

Answer
A

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

Answer
C

495. A ______ pinhole will give you sharp image.

A. Light

B. Small

C. Large

D. None

Answer
B

496. A _______ pinhole will give you blur picture.

A. Large

B. Small

C. None

Answer
A

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

A. Shiny

B. Sharp

C. Photographic

D. None

Answer
C

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

Answer
D

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

Answer
C

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

A. 50o

B. 45o

C. 60o

D. None of these

Answer
B
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