8th Grade > Physics
SOME NATURAL PHENOMENA MCQs
Total Questions : 58
| Page 4 of 6 pages
Answer: Option B. ->
False
:
B
:
B
If the two balloons repel each other, it means that they have acquired the same kind of charge. We know that like charges repel each other and unlike charges attract each other. So, the two inflated balloons repel each other as they have like charges.
Hence, the given statement is false.
Answer: Option A. ->
True
:
A
Lightning is an electric spark but on a huge scale. Lightning is a sudden electrical discharge that occurs in a thunderstorm. It is caused by the accumulation of charges in the clouds. The process of electric discharge can occur between two or more clouds or between clouds and the Earth.
:
A
Lightning is an electric spark but on a huge scale. Lightning is a sudden electrical discharge that occurs in a thunderstorm. It is caused by the accumulation of charges in the clouds. The process of electric discharge can occur between two or more clouds or between clouds and the Earth.
Answer: Option A. ->
The attracted object must be oppositely charged.
:
A
When a charged object attracts the other object, it implies that the attracted object is oppositely charged. Attraction takes place between opposite charges i.e. like charges repel and opposite charges attracts each other.
:
A
When a charged object attracts the other object, it implies that the attracted object is oppositely charged. Attraction takes place between opposite charges i.e. like charges repel and opposite charges attracts each other.
Answer: Option B. ->
Negative
:
B
The charge acquired by a glass rod when it is rubbed with silk is positive.
Like charges repel and unlike charges attract. The straw gets attracted to the glass rod, which necessarily means that the plastic straw acquired negative charge.
:
B
The charge acquired by a glass rod when it is rubbed with silk is positive.
Like charges repel and unlike charges attract. The straw gets attracted to the glass rod, which necessarily means that the plastic straw acquired negative charge.
Answer: Option B. ->
False
:
B
:
B
Richter scale is not linear. In fact, an increase of 2 in magnitude means 1000 times more destructive energy. For example, an earthquake of magnitude 6 has thousand times more destructive energy than an earthquake of magnitude 4.
Answer: Option B. ->
Installing lightning conductors
:
B
A lightning conductor is a device used to protect buildings from the effect of lightning. A metal rod is installed on the roof of the building during its construction such that the upper tip of the rod is higher than the highest point of the building. This rod is connected to the ground with a conducting wire. The rod provides an easy route for the transfer of electric charge to the ground while bypassing the building.
:
B
A lightning conductor is a device used to protect buildings from the effect of lightning. A metal rod is installed on the roof of the building during its construction such that the upper tip of the rod is higher than the highest point of the building. This rod is connected to the ground with a conducting wire. The rod provides an easy route for the transfer of electric charge to the ground while bypassing the building.
Answer: Option A. ->
Richter
:
A
:
A
The power of an earthquake is expressed in terms of a magnitude on a scale called Richter scale. It measures earthquakes with magnitudes ranging from 1 - 10. Destructive earthquakes have magnitudes higher than 7 on the Richter scale.
Answer: Option B. ->
The balls get repelled from each other.
:
B
:
B
When the glass rod is rubbed with silk, it becomes charged. Now, when both the metal balls touch the glass rod, both balls acquire the same kind of charge as that of the glass rod. As we know that like charges repel each other, these two balls will repel each other.
Answer: Option B. ->
Electrostatic force
:
B
Electrostatic force or coloumb force are attractive or repulsive forces between particles due to the presence of electric charge in them.
:
B
Electrostatic force or coloumb force are attractive or repulsive forces between particles due to the presence of electric charge in them.
Answer: Option D. ->
does not let any current to pass through the building and directs the charges to the ground
:
D
Lightning conductor is a metal rod that is placed on a building and connected with the ground with a conducting wire. In case of lightning, the charges find the least resistive path along the lightning conductor and goes to the ground, without posing any danger of current flow through the building.
:
D
Lightning conductor is a metal rod that is placed on a building and connected with the ground with a conducting wire. In case of lightning, the charges find the least resistive path along the lightning conductor and goes to the ground, without posing any danger of current flow through the building.
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