In the microphon , used in the public address system

A. Electric signals are first converted into sound waves
B. Sound waves are converted into electric signals which are amplified and transmitted
C. Sound waves are directly transmitted
D. Amplification is not required

Answer

Answer

B

Submitted by: Toheed Ahmed

What are the primary colours?

A. Blue, green, yellow
B. Green, white, black
C. Red, blue, green
D. Yellow, red, blue

Answer

Answer

C. Red, blue, green

Submitted by: Toheed Ahmed

Which one of the following changes is a physical change?

A. Conversion of milk into ice cream
B. Conversion of sugarcane juice into alcohol
C. Conversion of alcohol into vinegar
D. Conversion of milk into curd

Answer

Answer

A. Conversion of milk into ice cream

Submitted by: Toheed Ahmed