Waves

Q. Indira point in the Andaman and Nicobar islands got submerged because of _______________.

1. the tidal waves
2. the land erosion
3. the 2004 tsunami that struck the islands
4. global warming

Q. How are Tsunamis formed?

1. Tsunamis are formed due to disturbances in the Earth's crust.
2. Tsunamis are formed due to high tides.
3. Tsunamis are formed due to low tides.
4. None of the above

Q.

Tsunami is a Japanese word which means

1. Harbour waves

2. Tides

3. Ocean currents

4. Destruction

Q.

Minute after Minute, hour after hour, day after day, ocean waves continue to splash onto the shores. Explain why the beach is not completely submerged and why the middle of the ocean has not been yet depleted of its water supply?

Q. ___________ means 'harbour wave' in Japanese.

1. Jishin
2. Tsunami
3. Tsumani
4. Typhoon

Q. A _______ is something that experiences alternate rise and fall of water on the ocean surface.

1. wave
2. ocean currents
3. tides
4. cyclone

Q. Tsunamis travel at a speed of _____________.

1. more than or around 700 kilometres per hour
2. around 500 kilometres per hour
3. around 300 kilometres per hour
4. around 100 kilometres per hour

Q. The largest tsunami measured was around ________ high.

1. 135 metres
2. 120 metres
3. 100 metres
4. 150 metres

Q. When water rises and falls alternately over a short period of time, it is known as __________.

1. evaporation
2. currents
3. waves
4. tides

Q. How are the winds responsible for causing waves?

1. Winds clear the atmospheric moisture making it favourable for wave generation.
2. Winds are not responsible for wave generation.
3. Winds pull the ocean water causing waves.
4. Wind provides energy to the ocean water causing the water to rise and fall as waves.

Q. The topmost point of a wave is called its while the bottom-most part of the wave is called its .

1. wavelength
2. trough
3. crest
4. frequency

Q.

The movement of the earth’s plates causes (a) cyclones (b) lightning (c) earthquakes (d) thunderstorms

Q. Select the correct option after reading the statements.
1) A wave is something that experiences alternate rise and fall of water on the ocean surface.
2) Waves are created when winds keep blowing over the surface of oceans.

1. Both statements are false.
2. Statement 2 is true and statement 1 is false.
3. Statement 1 is true and statement 2 is false.
4. Both statements are true.

Q. What are waves?

1. Waves are the natural flow of oceans.
2. Waves are periodic movements of the ocean water due to the Moon and Sun’s gravity.
3. Waves are channels of water moving in a particular direction in the oceans.
4. Alternate rise and fall of water on the ocean surface are called waves.

Q. Which of the following countries were affected by the Indonesian Tsunami of 2004?

1. Sri Lanka
2. India
3. Indonesia
4. Canada

Q. The topmost point of the wave is called the and the bottom most point is called the

1. tuft
2. crest
3. topknot
4. trough

Q. Which of the following are major contributors to the formation of waves?

1. Rain
   
2. Undersea disturbances
3. Wind
   
4. Movement of ships

Q. What is the bottom most point of the wave called?

1. Trough
2. Tuft
3. Crest
4. Bottom-knot.

Q. What is the topmost point of the wave called?

1. Topknot
2. Trough
3. Tuft
4. Crest

Q. Which of the following options are the major causes of Tsunami?

1. Wind
2. Earthquakes under the sea
3. Landslides under the sea
4. Volcanoes under the sea

Q. What does 'Tsunami' mean in Japanese?

1. It means 'Massive Wave'.
2. It means 'Shallow Wave'.
3. It means 'Harbour Wave'.
4. It means 'Wave'.

Q. While cause movements on the surface of oceans, make entire oceans move.

1. currents
2. tides
3. waves
4. energy

Q. Select the disturbances which are likely to create a tsunami.

1. Earthquake
2. Wind
3. Volcanic eruption
4. Erosion

Q. Ammu is a lifeguard at a beach on the eastern coast of India. On one of her days off, her colleague tells her that the water of the ocean has receded rapidly. What could be the reason for this sudden and rapid receding of water at the beach?

1. Tsunami
2. Typhoon
3. High tide
4. Volcanic eruption

Q.

In which of the following forms do the vibrations travel outwards from the epicenter?

1. Tides

2. Layers

3. Waves

4. None of the above

Q.

Define Tsunami (any 3)sentences?

Q. Assertion :Ocean waves hitting a beach are always found to be nearly normal to the shore. Reason: Ocean waves are longitudinal waves.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. How are waves formed?

1. They are formed due to the gravitational force exerted by the Sun and the Moon on the Earth.
2. They are formed due to the alternating winds blowing over the ocean surface.
3. They are formed due to the disturbances in the Earth's crust.
4. They are formed as they are a natural movement of the ocean.