Some Natural Phenomena

A natural phenomenon, whose triggering is not associated with an earthquake, is

• Tsunami

• Landslide

• Flood

• Eruption of volcano

The epicentre of an earthquake is

• deep under the crust of earth

• in the mantle of earth

• on the surface of earth

• in the core of earth

The magnitudes of two earthquakes, A and B, on the Richter scale, were 7 and 5, respectively. The strength of

• earthquake A is 100 times that of earthquake B

• earthquake A is 10 times that of earthquake B

• earthquake A is 2 times that of earthquake B

• Earthquake A is 1/10 times that of earthquake B

Which of the following cannot be charged by friction?

• Plastic Scale

• Copper rod

• Inflated balloon

• Woollen cloth

Two objects rubbed against each other

• will lose electrons

• one will loses and the other will gain electrons

• will gain electrons

• none of these

The point where the shock-waves of an earthquake originate is called

• epicenter

• focal depth

• seismic focus

• none of these

The shock waves produced by an earthquake travel

• along the surface

• deep inside the earth

• only in the air

• both, one the surface and inside the earth

The electroscope is a device which is used to find if an object is

• charged

• free of cracks

• magnetic

• hot

Electric current is to be passed from one body to another. For this purpose, the two bodies must be joined by

• cotton string

• copper wire

• plastic string

• rubber band

Two charged objects are brought close to each other. Choose the most appropriate statement from the following options:

• they may attract each other

• they may repel each other

• they may attract or repel depending on the type of charges they carry

• there will be no effect