Sound-waves from a loud speaker is caused by:

• frequency
• vibrations
• pitch
• amplitude
Correct Option: B  [ vibrations ]

Remark:

A fuse wire has :

• high resistance and high melting point
• low resistance and high melting point
• low resistance and low melting point
• high resistance and low melting point
Correct Option: D  [ high resistance and low melting point ]

Remark:

Which layer of gas in the atmosphere protects us from harmful ultra violet rays of the sun?

• Oxygen
• Carbon dioxide
• Nitrogen
• Ozone
Correct Option: D  [ Ozone ]

Remark:

Which one is the hardest form of carbon ?

• Coke
• Graphite
• Diamond
• Charcoal
Correct Option: C  [ Diamond ]

Remark:

Ozone hole refers to :

• hole in Ozone layer
• decrease in the Ozone layer
• decrease in thickness of Ozone layer
• increase in thickness of Ozone layer
Correct Option: C  [ decrease in thickness of Ozone layer ]

Remark:

Which one of the following animals is not "warm-blooded"?

• Hen
• Tiger
• Bat
• Toad
Correct Option: D  [ Toad ]

Remark: frogs and toads are cold-blooded. This means their body temperatures change to match the temperatures of their environment.

Which acid is released when an Ant bites?

• Hydrochloric Acid
• Formic Acid
• Acetic Acid
• Phosphoric Acid
Correct Option: B  [ Formic Acid ]

Remark:

In plants, extra-chromosomal DNA is found in

• Nucleus
• Chloroplast
• Ribosome
• Golgi bodies
Correct Option: B  [ Chloroplast ]

Remark: In many cases, extrachromosomal DNA is contained in cytoplasmic organelles, such as mitochondria (animals), and in chloroplasts and plastids (plants).

The disease caused due to lack of antidiuretic hormone (ADH):

• Diabetes insipidus
• Diabetes mellitus
• Grave's disease
• Cushing's disease
Correct Option: A  [ Diabetes insipidus ]

Remark:

Sound causes hazardous noise pollution at decibels:

• Above 50
• Above 80
• Above 100
• Above 130
Correct Option: B  [ Above 80 ]

Remark: