Lightning

Q.

Tick the correct answer. The innermost layer of the earth is

1. Core

2. Crust

3. Mantle

4. None of these

Q.

Explain how lightning takes place?

Q. An ebonite rod is rubbed with fur. What will be the charge on the ebonite rod?

1. Negative
2. Positive
3. Neutral
4. Can't say

Q.

Question 12

The weather department has predicted that a thunderstorm is likely to occur on a certain day. Suppose you have to go out on that day. Would you carry an umbrella? Explain.

Q. Which of the following natural phenomena is not possible to predict?

1. Thunderstorm
2. Cyclone
3. Floods
4. Earthquake

Q. The stepped leaders move in steps of approximately .

1. 250 cm
2. 250 m
3. 50 m
4. 50 cm

Q. Which of the following is a manmade disaster?

1. Earthquake
2. Oil spills
3. Storm
4. Tsunami

Q. Which of the following statements is incorrect with respect to lightning between clouds?

1. An electric discharge between oppositely charged clouds occurs.
2. Air between the oppositely charged clouds ionizes.
3. Charges flow easily between the clouds since air is a good conductor of electricity.
4. When a charged cloud comes close to another cloud, it induces an opposite charge in the second cloud.

Q.

Which earthquake wave is more dangerous?

Q. Which of the following is/are true during a lightning?

1. A loud sound will be heard.
2. A bright light will be seen.
3. There will be a huge wind carrying light.
4. Sudden shaking of the Earth.

Q.

The lower portion of clouds are negatively charged, what effect would it have on the Earth?

1. Attract the positive charges to the surface, and cause them to accumulate

2. Attract the negative charges to the surface, and cause them to accumulate

3. Both A and B

4. None of these

Q. When stepped leaders approach, the streamers move from ground towards clouds.

1. positive
2. negative
3. neutral

Q. Which among the following is the correct way to ensure one’s safety during lightning?

1. Using umbrellas to take cover from lightning.
2. Taking shelter under tall electric poles and towers.
3. Taking shelter in a closed space like cars, houses, etc.
4. When in open areas, squat and move to a safer place.

Q. Why doesnt lightning occur on a bright sunny day?

Q.

How are clouds charged?

Q.

Question 11 (iv)

State whether the following statements are True/False.
The process of electric discharge cannot occur between clouds and the earth.

Q. The stepped leaders move in steps of approximately .

1. 50 m
2. 250 m
3. 50 cm
4. 250 cm

Q. Name the areas which are affected by landslides. What will you do before, during and after landslides?

Q. Which among the following is the correct way to ensure one’s safety during lightning?

1. When in open areas, squat and move to a safer place.
2. Taking shelter in a closed space like cars, houses, etc.
3. Using umbrellas to take cover from lightning.
4. Taking shelter under tall electric poles and towers.

Q. When stepped leaders approach, the streamers move from ground towards clouds.

1. positive
2. neutral
3. negative

Q. On rubbing glass rod and silk, if the glass rod loses five electrons, wool gains electrons.

1. more than five
2. five
3. less than five

Q. When a glass rod is rubbed with a silk cloth, glass loses and acquires a charge.

1. neutrons
2. electrons
3. protons
4. negative
5. positive