Question : Which of the following statements about the ionosphere is not correct?

Option 1: It contains charged particles.

Option 2: It is ionised by solar and cosmic radiation.

Option 3: Radio waves transmitted from the earth are reflected back to the earth by this layer.

Option 4: It is located immediately above the stratopause.

Question : Which of the following Statements is false?

Option 1: Polystyrene was discovered in 1839 by Edward Simon.

Option 2: It is used for making plastics and CD cases.

Option 3: It is not biodegradable.

Option 4: None of these

Question : Which of the following is correct regarding "Monsoon"?

Option 1: The word monsoon is derived from the Arabic word and it refers to the seasonal reversal in the wind direction during a year.

Option 2: The word monsoon is derived from the Tamil word and it refers to the seasonal reversal in the wind direction during a year.

Option 3: The word monsoon is derived from the Tamil word and it refers to the seasonal reversal in the wind direction every month.

Option 4: The word monsoon is derived from the Arabic word and it refers to the seasonal reversal in the wind direction every month.

Question : Which of the following statements about Ganymede is not correct?

Option 1: It is the only moon known to have its own internally generated magnetic field.

Option 2: It is the largest natural satellite in our solar system.

Option 3: It is bigger than Mercury.

Option 4: It revolves around Saturn.

Question : Directions: In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
b_cd_d_bcc_cdb_

Option 1: dbbbc

Option 2: bddcb

Option 3: dccbd

Option 4: bcccb