# CDS GK(3) Questions and answers

Topics

1). By what mechanism does scent spread all over the room if the lid is opened ?
 A). Pressure in the bottle B). Compression from the bottle C). Diffusion D). Osmosis
2). What type of mixture is smoke ?
 A). Solid mixed with a gas B). Gas mixed with a gas C). Liquid mixed with a gas D). Gas mixed with a liquid and a solid
3). A compound that is a white solid which absorbs water vapour from the air is :
 A). Sodium nitrate B). Calcium chloride C). Sodium carbonate D). Calcium sulphate
4). What are the elements which are liquids at room temperature and standard pressure ?
1. Helium
2. Mercury
3. Chlorine
4. Bromine
Select the correct answer using the code given below :

 A). 2 and 3 only B). 2, 3 and 4 C). 2 and 4 only D). 1 and 3
5). Which one among the following colours has the highest wavelength ?
 A). Violet B). Green C). Yellow D). Red

6). Which one among the following is not a correct statement ?
 A). Cathode rays are negatively charged particles B). Cathode rays are produced from all the gases C). Electrons are basic constituents of all the atoms D). Hydrogen ions do not contain any proton
7). $$\Large NaOH + HCL -> NaCl + H_{2}O$$
In the above chemical reaction ;

 A). Sodium is oxidized and oxygen is reduced B). Sodium is oxidized and chlorine is reduced C). Sodium and hydrogen are oxidized D). None of them are oxidized or reduced
8). Which element forms the highest number of compounds in the periodic table ?
 A). Carbon B). Oxygen C). Silicon D). Sulphur
9). Dirty cloths containing grease and oil stains are cleaned by adding detergents to water. Stains are removed because detergent :
 A). reduces drastically the surface tension between water and oil B). increases the surface tension between water and oil C). increases the viscosity of water and oil D). decreases the viscosity in detergent mixed water
10). Motion of an oscillating liquid column in a U-tube 1s :
 A). periodic but not simple harmonic B). non periodic C). simple harmonic and time period is independent of the density of the liquid D). simple harmonic and time period depends on the density of the liquid
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