Fill in the blanks -
ts
Q11. Ploughing is the process of
and
of the soil
Q12. Chemicals use to kill insects are called
Q13 Microorganisms can be seen with the help of a
Q14. Two main types of plastics are
and
Q15
is the last reactive metal in reactivity series.
Q16. Full form of IUCN IS
Q17. The north pole of a magnet
the south pole of another magnet
Q18. Friction depends upon the
of surfaces.
Q19. Loudness of sound is measured in the unit
Q20. Full form of CFC is
57/805
u
English (U.SI
Answers
Answer:
11- Breaking and loosening soil
12-Pesticides
13-Naked eyes
14-Thermoplastic and Thermosetting
15-Caesium
16-International Union Conservation of nature
17-Magnets can also attract each other, but only if they face in opposite directions. A magnet has two ends called poles; one end is the north pole and the other is the south pole. A north pole will attract a south pole; the magnets pull on each other.
18-Rough
19-Decibels
20-Chloroflurocarbons
Answer:
1. loosening and turning of the soil.
2. pesticides
3. Microscope
4. thermoplastic and thermosetting
5. caesium
6.International Union for Conservation of Nature
7.
Opposite poles attract, or pull, each other. In other words, the north pole of one magnet will click together with the south pole of another magnet, and two north poles will push each other away
8. Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth. ... It does, however, depend on the magnitude of the forces holding the bodies together.
9.The loudness of sound is measured in units called decibels (dB). A decibel unit expresses the relative intensity of sounds on a scale from zero for the average least perceptible sound to about 100 dB, which is near the level most people find uncomfortably loud .
10. Chlorofluorocarbons (CFCs).