Question

CLASS: VII ASSESSMENT -4 SCIENCE MARKS: 25

I) CHOOSE THE CORRECT ANSWER . 10X1=10 Marks

1.A _______(beam / ray) of light is made up of ________(beams/rays) of light.

2. Burning of wood is an example of a ________( physical/ chemical) change.

3. Sunlight and white light are made up of _______( five/seven ) colours.

4.__________ (Convex/ Concave) mirror is used by the dentist.

5. Pure table salt can be obtained through________(rusting/ crystallization)

6. Convex and concave mirrors are both ________( plane/ spherical) mirrors.

7. Air is an example of a _________( mixture/ compound)

8. _________( Virtual/ Real) image cannot be projected on the screen.

9. ____________( Atoms/ Molecules) are a group of one or more atoms joined together

chemically.

10. Concave mirrors are _______( converging/ diverging) mirrors

II) NAME THE FOLLOWING 5 X 1 = 5 Marks

1. Two luminous objects

2. A change where no new substances are formed.

3. The image formed in case of a convex mirror.

4. The process of appearance of a reddish brown layer on iron.

5. The travel of light in a straight line

III) ANSWER THE FOLLOWING 5 X 2 = 10 Marks

1A). Write the chemical symbols of the following elements.

a) Sodium -

b) Calcium -

c) Gold –

d) Silver -

B). What is atomicity?

2) Write the four steps involved in writing a chemical formula.

3) Distinguish between Regular reflection and diffused reflection.

4) State the uses of a plane mirror.

5) Describe the following terms associated with spherical mirrors.

a) Principal axis b) Focal length

ALL THE BEST​

Answer 1

Answer:

1. ray, beams
2. chemical
3. seven
4. concave
5. crystallization
6. spherical
7. mixture
8. virtual
9. molecules
10. converging

Explanation:

HOPE THIS HELPS U.....

MARK AS BRAINLIST....

IN RETURN GIVE THANKS......