show that in this type of Collision the relative velocity of approach is before collision is equal to relative velocity of recession after collisi
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Answers
Answer:
4.
Which of the following is not a traditional irrigation method?
(1 Point)
( a)Moat
( b) Chain pump
( c)Lever system
(d)Drip system
5.
Weeds are controlled by chemicals called _________.
(1 Point)
( a)Pesticides
(b)Fungicides
(c)Weedicides
(d)Insecticides
6.
Arrange the following agricultural practices in the order in which they are followed.
1. Harvesting
2. Sowing
3. Storage
4. Irrigation
5. Preparation of soil
(1 Point)
( a) 1→2→3→4→5
( b) 5→2→4→1→3
( c) 2→1→3→5→4
(d) 5→3→4→1→2
7.
Identify the agricultural method in which different crops are grown on a piece of land season after season.
(1 Point)
( a) Irrigation
( b) Monoculture
( c) Crop rotation
(d) Shifting cultivation
8.
Rhizobium bacteria in the root nodules of leguminous plants help in fixing:
(1 Point)
( a) Sulphur
( b) Oxygen
( c) Nitrogen
( d) Hydrogen
9.
Wheat and gram belong to
(1 Point)
(a) Rabi crops
(b) Kharif crops
(c) Both of these
(d) None of these
10.
The process of separating grains from chaff is known as:
(1 Point)
( a) Threshing
( b) Harvesting
( c) Tilling
( d ) Transplantation
11.
The disease caused by protozoa is
(1 Point)
(a) tuberculosis
(b) polio
(c) typhoid
(d) malaria
12.
Which bacteria helps in settling of curd?
(1 Point)
(a) Rhizobium
(b) Lactobacillus
(c) Vibriocholarae
(d) Bacillus
13.
What helps in the rise of bread or dosa dough?
(1 Point)
(a) Heat
(b) Grinding
(c) Growth of yeast cells
(d) Low pressure
14.
Vaccine for small pox is discovered by
(1 Point)
(a) Louis Pasteur
( b) Alexander Fleming
( c) Edward Jenner
( d) John Mendal
15.
Amount of nitrogen in the atmosphere is
(1 Point)
(a) 58%
( b) 68%
( c) 78%
( d) 88%
16.
In order to take precautionary steps to control DENGUE , we must take measures to stop the breeding of:
(1 Point)
( a) Aedes mosquito
(b) Fleas
( c) Fire ants
( d) Anopheles mosquito
17.
Which of the following is a communicable disease?
(1 Point)
( a) Diabetes
( b) Chicken pox
( c) Alzheimer’s
( d) Cancer
18.
The metal which is liquid at room temperature is
(1 Point)
(a) sodium
(b) bromine
(c) calcium
(d) mercury
19.
Name the gas evolved when magnesium reacts with dilute hydrochloric acid
(1 Point)
(a) Chlorine
(b) Oxygen
(c) hydrogen
(d) Nitrogen
20.
Materials having qualities of both metals and non-metals are
(1 Point)
(a) Elements
(b) metalloids
(c) noble metals
(d) none of these
21.
A reaction in which a more reactive metal replaces a less reactive metal from its salt solution is called a________ reaction.
(1 Point)
(A.) combination
(B. ) displacement
(C). double displacement
(D.) addition
22.
When sulphur reacts with oxygen, the oxide formed is ___ in nature.
(1 Point)
(A.) alkaline
(B.) neutral
(C.) basic
( D.) acidic
23.
The property by which metals can be beaten into sheets is known as ___
(1 Point)
( A.) ductility
( B.) sonority
( C.) lusture
(D.) malleability
Here, for collision to happen, V1>V2
velocity of approach =U1−U2 [velocity w.r.t]
velocity of separation =V2−V2 [vel.w.r.t]
As we know,
Coefficient of restitution (e) =vel.ofapproachvel.ofseperation
∴e=U1−U2V2−V1.
and, e=1 for elastic collision.
1=U1−U2V2−V1
U1−U2=V2−V1.
So,
Explanation:
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