Science Test

What is the range of audible frequencies for human ear?

• 20 - 200Hz

• 20 - 20,000 Db

• 20 - 20,000Hz

• None of These

When wires are connected into a half cut potato, a greenish blue spot appears near the wire connected to the ___________ terminal of the battery.

• Positive

• Negative

• Neutral

• All of These

The length of vocal cords is _________ mm and _________ mm in men and women respectively.

• 20,15

• 15,20

• 15,25

• 25,30

Convert 30,000Hz to kHz

• 300kHz

• 30kHz

• 3kHz

• 3000kHz

Unpleasant sound is also called ______________

• Amplitude

• Music

• Noise

• Frequency

Sound is produced by (a)  

The job of the eardrum is to _________ the sounds.

• Amplify

• Minimize

• Stop

• Mute

__________ water is a poor conductor of electricity.

• distilled

• impure

• salty

• hot

_______________ and ______________ are used in testers to detect even the weakest of currents.

• LED Bulbs / magnetic needle

• sewing needle/ CFL Bulbs

• Fused Bulbs/ Magnetic needle

• Kerosene lamp /sewing needle

When wires are inserted into a half cut potato, a greenish blue spot appears near the wire connected to the _________ terminal of the battery

• Positive

• Negative

• None of these

• All of these