8th Grade > Physics
SOME NATURAL PHENOMENA MCQs
Total Questions : 58
| Page 5 of 6 pages
Answer: Option A. ->
lightning
:
A
A thunderstorm can be accompanied with lightning and cyclone.
:
A
A thunderstorm can be accompanied with lightning and cyclone.
Answer: Option A. ->
to detect and test small electric charges.
:
A
An electroscope is a device that is used to detect the presence of an electric charge on a body. It is made up of a metal detector knob on top which is connected to a pair of metal leaves hanging from the bottom of the connecting rod. When no charge is present the metals leaves hang loosely downward. In the presence of charge, the leaves repel each other.
:
A
An electroscope is a device that is used to detect the presence of an electric charge on a body. It is made up of a metal detector knob on top which is connected to a pair of metal leaves hanging from the bottom of the connecting rod. When no charge is present the metals leaves hang loosely downward. In the presence of charge, the leaves repel each other.
Answer: Option C. ->
Charge acquired by a glass rod is negative when it is rubbed with silk.
:
C
the glass rod aquires negative charge as it gains elctrons when rubbed with silk.
:
C
the glass rod aquires negative charge as it gains elctrons when rubbed with silk.
Answer: Option B. ->
Copper rod
:
B
Only non-conducting materials can be easily charged by friction. Copper is a highly conducting material. Therefore, a copper rod cannot be charged easily by friction.
:
B
Only non-conducting materials can be easily charged by friction. Copper is a highly conducting material. Therefore, a copper rod cannot be charged easily by friction.
Answer: Option C. ->
Benjamin Franklin
:
C
Lightning conductor is a metal rod usually placed atop high towers and buildings to prevent damage caused by the direct hit of a lightning. The metal rod collects charges and directs it to the earth. It was invented by Benjamin Franklin in 1749.
:
C
Lightning conductor is a metal rod usually placed atop high towers and buildings to prevent damage caused by the direct hit of a lightning. The metal rod collects charges and directs it to the earth. It was invented by Benjamin Franklin in 1749.
Answer: Option C. ->
B = 100A
:
C
Richter scale is not a linear scale but a logarithmic scale. In the richter scale the magnitude of next value is 10 times the previous value, like 1, 10, 100, 1000. For example, on this scale the vibration of an earthquake with a magnitude of 2 is 10 times greater in amplitude than an earthquake with magnitude of 1. Similarly a difference in magnitude of '2' implies a multiplication factor of 100 for the amplitude and 1000 times more destructive energy.
:
C
Richter scale is not a linear scale but a logarithmic scale. In the richter scale the magnitude of next value is 10 times the previous value, like 1, 10, 100, 1000. For example, on this scale the vibration of an earthquake with a magnitude of 2 is 10 times greater in amplitude than an earthquake with magnitude of 1. Similarly a difference in magnitude of '2' implies a multiplication factor of 100 for the amplitude and 1000 times more destructive energy.
Answer: Option A. ->
Static
:
A
The electrical charges generated by rubbing two objects are static and they do not move by themselves.
:
A
The electrical charges generated by rubbing two objects are static and they do not move by themselves.
Answer: Option B. ->
epicentre
:
B
Epicentre is the point on the earth's surface directly above the origin of the earthquake.
:
B
Epicentre is the point on the earth's surface directly above the origin of the earthquake.
Answer: Option C. ->
Accumulation of charges in clouds
:
C
Lightning is caused due to the accumulation of charges in the clouds. As the charge density in the clouds increases, air can no longer stop the flow of charges and lightning strikes. The process of electric discharge can occur between two or more clouds or between clouds and the Earth.
:
C
Lightning is caused due to the accumulation of charges in the clouds. As the charge density in the clouds increases, air can no longer stop the flow of charges and lightning strikes. The process of electric discharge can occur between two or more clouds or between clouds and the Earth.
Answer: Option B. ->
Lightning
:
B
Lightning is a sudden electrical discharge that occurs in a thunderstorm. The process of electric discharge can occur between two or more clouds or between clouds and the Earth.
:
B
Lightning is a sudden electrical discharge that occurs in a thunderstorm. The process of electric discharge can occur between two or more clouds or between clouds and the Earth.
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