Question : An element that does not occur in nature but can produced artificially is

Option 1: Thorium

Option 2: Radium

Option 3: Plutonium

Option 4: Uranium

Question : Directions: Arrange the following in ascending order.
1. Centimetre
2. Kilometre
3. Decimetre
4. Metre

Option 1: 1, 3, 4, 2

Option 2: 2, 4, 3, 1

Option 3: 3, 1, 2, 4

Option 4: 4, 2, 1, 3

Question : The element which is required by the plant in large quantity:

Option 1: Calcium

Option 2: Nitrogen

Option 3: Photophorus

Option 4: Sulphur

Question : The most abundant element by number in the living system is:

Option 1: Nitrogen

Option 2: Hydrogen

Option 3: oxygen

Option 4: carbon

Question : If $P:Q=1: 3, Q:R=3:4,$ and $R: S=2:1$, then what is the value of $P:S$?

Option 1: $3:1$

Option 2: $2:1$

Option 3: $1:2$

Option 4: $3:2$