Question

Q.1 Choose the correct answer.
1. Fe2O3+2A1_ A1203+2 Fe
The above reaction is an example of a
a) Combination reaction b) double displacement reaction
c) decomposition reaction d) displacement reaction
2. The breakdown of private to give carbon dioxide, water and energy takes place in
a) cytoplasm b) mitochondria c) chloroplast d) nucleus
3. Which one of the following materials cannot be used to make a lens?
a) water b) Glas c) Plastic d) Clay
4. Which of the following terms does not represent electrical power in a circuit?
a) 122 b)IR2 CVI d) V2/R
5. Which of the following constitute a food-chain?
a) Grass, wheat and mango b) Grass, goat and human
c) Goat, cow and elephant d) Grass, fish and goat
The autotrophic mode of nutrition requires
a) carbon dioxide and water b) Chlorophyll
c) sunlight
d) all of the above
The change in focal length of an eye lens is caused by the action of the
a) pupil b) retina c) ciliary muscles d) iris
The first tropric level in an ecosystem is
a) consumer b) producer c) Decomposer d) All of the above
SI unit of electric Potential difference
a) volt b) watt c) joule d)Amper​

Answer 1

Answer:

1 fe

2b

3 a

4a

5a grass, wheat And mango

Answer 2

Answer:

ans to 1. displacement reaction

ans to 2. mitochondria

ans to 3 . clay

ans to 4. IR2

ans to 5. grass ,goat,and human

ans to 6. all of the above

ans to 7. ciliary muscles

ans to 8. producer

ans to 9. volt