Question

12
Q.1 Choose the correct option
4. The power house of eell is called
a) Call wall
b) Mitochondria e) Ribosomes d) Nucleus
5 Cell is discovered by
2) Robert Brown b) Robert Hooke c) John Mendal d) Charse Darwin
6. Weedicides are used to destroy:
a) insects
b) weeds
c) pests
d) none of these
7. Amount of nitrogen in the almosohere is
a) 58%
b) 68%
e) 78%
d) 88%
8. Poor conductors are
a. Plastics
b. Clothes
c. Wood
d. All of these
9. The like charges
a. Repel each other b. Attract each other c. No interaction takes place d. All of these
10. Friction is a
a Contact force b. Non-contact force c. Magnetic force
d. None of these
II. What is Torve?
a poll
b. push
c. push and push both
d. none of these
12. The hearing range of human ear is
1) 20 Hz to 20,000 Hz b) Less than 20 Hz c) More than 20,000 Hz
d) 20 Hz to 25.000 Hz
Q.2 Answer the following questions in one sentence. (I marks each)​

Answer 1

Answer:

4(b) mitochondria

5(b) Robert Hooke

5(b)

7(c)

8(d)

9(a)

10(a)

11(c)

12(a)