NCERT Science Hard CLASS - 8

Which of the following cannot be changed easily by friction?

• Plastic Scale

• Copper Rod

• Inflated Balloon

• A Woollen Cloth

When a glass rod is rubbed with a piece of silk cloth the rod

• and the cloth both acquire a positive charge.

• becomes positively charged while the cloth has a negative charge.

• becomes negatively charged while the cloth has a positive charge

• becomes negatively charged while the cloth has a positive charge

Hen’s egg is a

• Tissue

• Organ

• Organ System

• Cell

The calls capable of changing shapes are

• Amoeba Cell

• WBC

• Both of these

• None of these

The hearing range of human ear is

• 20 Hz to 20,000 Hz

• Less than 20hz

• More than 20,000 hz

• 20hz to 25,000 hz

Tags

NGSS.MS-LS1-8

NGSS.MS-PS4-1

Large amplitude of sound vibrations will produce:

• Loud Sound

• Mean Sound

• Slow Sound

• Streak

Tags

NGSS.MS-PS4-1

Spyrogyra is

• An Algae

• A Fungi

• A Protozoa

• An Bacteria

Vaccine for small pox is discorvered by

• Louis Pasteur

• Alexander Fleming

• Edward Jenner

• John Mendal

Penicillium is a

• Algae

• Fungus

• Bacteria

• Yeast

Electroplating is based on

• Magnetic effect of electricity

• Chemical effect of electricity

• Heating effect of electricity

• Physical effect of electricity

Tags

NGSS.MS-PS1-5