Question:
A woman's voice is shriller than man's voice due to _____.
Answer:
Higher frequency
Question:
Why oil or soap film appears coloured in daylight?
Answer:
Due to Interference
Question:
What is common device works on the basis of the principle of mutual induction?
Answer:
Transformer
Question:
What is the unit of activity of a radioactive source?
Answer:
Becquerel
Question:
When a ball is thrown upward What remains constant?
Answer:
Acceleration
