Question

Please answer Fast ! <3

1. Which of these is both a physical and irreversible change?
a. Burning of paper b. Evaporation of water
c. Breaking of glass tumbler d. Lightening of an electric bulb

2. The shape and size of a shadow depends on
a. The shape and size of the object
b. The position of the light source
c. The distance between the source of light and object
d. All of the above

3. Which of the following is used as the power source in a satellite?
a) Dry cells b) Solar cells c) Rechargeable button cell d) Battery

4. Identify the incorrect statement about the body parts that help the birds to fly.
a) The birds have hollow bones which makes them light weight.
b) Their fore limbs are modified as feathers.
c) They have weak chest muscles.
d) The stream lined body shape helps the birds to cut through the air to fly.

5. When no more solute can dissolve in a solution said to be _______________
a) Definite b) saturated c) liquefied d) miscible

6. The dust particles in water can settle down faster by using _________________
a) Common salt b) Alum c) Sugar d) Alcohol

7. Images formed by a pinhole camera are __________________________
a) Erect b) inverted c) bent d) reflected

Answer 1

1st answer is C.

2nd answer is B.

3RD answer is B.

4th answer is D.

5th answer is A.

6th answer is A.

7th answer is B.

hope it helps :)

Answer 2

1- burning of paper.

2-all of the above

3-(i am not confirm but in my opinion it should be) solar cells.

4-the birds have hollow bones which makes them light weight.

5-saturated

6-alum

7-inverted