Question

1. The pitch of sound depends on
a. Frequency
b Amplitude
c Quality
d. None of these
2. Which of the following is noted contact force?
a Friction b. Biological force c. Mechanical force d. Gravity
3. Which of the following way uses to reduce friction
a. Use lubricant
b. use wheel cStreamlined body
d. All of these
4.1 kg force is equal to
a. 9.80 Newton
b. 198 Newton
C. 980 Newton
c. 0.98 Newton
5. The pull of earth is called
a. Mechanical force b. Electrostatic force frictional force
c. d. none of thes
6. The type of friction exists between a surface sliding on another surface is
a. Sliding
b. Dynamic
c. Rolling
d. Limiting​

Answer 1

Answer:

1.b

2.c

3.3.d

4.4.a

5.5.c

6.c

Answer 2

Answer:

1. frequency

2. friction

3. use wheel

4. 9.80

5. gravity

6. sliding

7. none of these

I dont know 8th and 9th questions ok...