Question

Choose the correct answer. 10 X ½ =5M

1. Rayon is prepared by ( )

A) Coal B) Oxygen C) Fibre D) Cellulose

2. Necessity of labels on clothes ( )

A) Required by law B) To identify fabric content

C) Both A & B D) They do not decompose

3. The material which is not decomposed by natural process is called ( )

A) Non bio-degradable material B) Bio-degradable material

C) Polyester D) Nylon

4. An object which moves to and fro motion from rest known as ( )

A) Linear motion B) Vibration

C) Simple motion D) Angular motion

5. The number of vibrations produced per second is known as ... ( )

A) Frequency B) Shrillness C) Vibration limit D) Decibels

6. The audible sound range of man is ( )

A) 10-10000 Vibration/sec B) 20-20000 Vibration/sec

C) 30-30000 Vibration/sec D) 40-40000 Vibration/sec

7. Let the forces F1 and F2

act on the table in opposite directions F1 > F2

,

the F net = ( )

A) F1 - F2 B) F1 + F2 C) 0 D) 2F2 - F1

8. A situation for effect of force leads to a permanent change in shape of object is

( )

A) Stretching Rubber band B) Squeezing a sponge

C) Pressing the Spring D) Breaking glass

9. The bodies of birds and fishes must have evolved to shapes which would make them

not to loose much energy in overcoming ( )

A) Rolling friction B) Static friction C) Sliding friction D) Fluid friction

10. Which of the following friction has self adjusting force ( )

A) Sliding friction B) Static friction C) Rolling friction D) Fluid friction​

Answer 1

Answer:

Sliding friction B) Static friction C) Rolling friction D) Fluid friction