Question : Siderosis is a disease caused by the inhalation of

Option 1: silica dust

Option 2: iron dust

Option 3: zinc dust

Option 4: coal dust

Question : Tides are caused by the gravitational pull of the

Option 1: Earth on the Moon

Option 2: Earth on the Sun

Option 3: Sun and Moon on the Earth

Option 4: Moon on the Earth

Question : Which of the following is NOT a primary greenhouse gas in the earth's atmosphere?

Option 1: Methane 

Option 2: Ozone 

Option 3: Nitrous oxide 

Option 4: Hydrogen 

Question : Trichloromethane is better known as:

Option 1: chloroform

Option 2: butanes

Option 3: LPG

Option 4: laughing gas

Question : Directions: Select the option that is related to the fifth letter cluster in the same way as the second letter cluster is related to the first letter cluster and the fourth letter cluster is related to the third letter cluster.
BEAR : QZDA :: DUST : SRTC :: GOLD : ?

Option 1: CKNF

Option 2: KCFN

Option 3: CNFJ

Option 4: FGNC