Which one of the following is used as preservative?
Sodium benzoate
Ammonium sulphate
Sodium chloride
Copper sulphate
Which one of the following is a step of analogy strategy in science?
Presentation of abstraction
Interlinking concepts
Application
Map similarities
If the frequency of a simple pendulum is 2 Hz, how many oscillations will it complete in 16s?
16
64
32
8
C.
32
Given, frequency= 2 Hz =2 oscillations
The pendulum oscillates two times in one second.
Then, oscillations in 16s
= 16 x 2 = 32 oscillation
Magnesium hydroxide (Mg (OH)2) is used as
reducing agent
anti-acid
fermentation agent
oxidising agent
Which one of the following gases burn with pop sound?
Hydrogen
Nitrogen dioxide
Sulphur dioxide
Oxygen
Which of the following is/are example(s)of non-contact force?
Muscular force
Gravitation force
Magnetic force
Both (A) and (B)