World Cancer Day is observed across the world on:

• 10th January
• 4th February
• 5th June
• 15th July
Correct Option: B  [ 4th February ]

Remark:

National Science Day is observed on

• 22 December
• 28 February
• 5 June
• None of these
Correct Option: B  [ 28 February ]

Remark: To mark the discovery of the Raman effect by Indian physicist Sir Chandrashekhara Venkata Raman on 28 February 1928.