Kaleidoscope is based on the principle of __________ of plane mirrors. Fill in the blank.A) Single reflectionB) Multiple reflectionC) RefractionD) Dispersion

Of which material is a potentiometer wire normally made and why?

Whom does wind God like?

• A. Weak people
• B. Those who talks to it
• C. Strong people
• D. None of these

What direction compass needle points at poles ? Which needle to be used at poles ?

Spring constant is a dimensional contant. Justify.

The width of the class interval 30-40 is:

• A. 10
• B. 30
• C. 40
• D. 70