Worksheet: The Hydrosphere | Window on the Word Class 7: Solutions, Notes & Worksheets PDF Download

Q1: Multiple Choice Questions (MCQs)

(i) What percentage of Earth's surface is covered with water?
(a) 50%
(b) 71%
(c) 97%
(d) 100%

(ii) What makes ocean water unsuitable for drinking?
(a) High temperature
(b) Low salinity
(c) High salt content
(d) Clear appearance

(iii) What are the three main processes in the water cycle?
(a) Boiling, freezing, melting
(b) Evaporation, condensation, precipitation
(c) Rain, snow, hail
(d) Drinking, bathing, swimming

(iv) What primarily causes ocean waves?
(a) The Moon's gravitational pull
(b) Earth's rotation
(c) Strong winds blowing across the ocean's surface
(d) Tides

(v) When do neap tides occur?
(a) During a Full Moon
(b) During a New Moon
(c) When the Moon and Sun are at right angles to each other
(d) When the Moon and Sun align

Q2: Fill in the Blanks

(i) Oceans and seas contain about ____% of the total water in the hydrosphere.
(ii) The gravitational pull of the Moon and the Sun causes the rise and fall of ocean waters, known as ____.
(iii) Ocean currents are influenced by factors like temperature, Earth's rotation, winds, density, salinity, and the shape of the ____.
(iv) The process of water changing from a liquid to a gas is called ____.
(v) Tsunami Warning Systems provide timely alerts to coastal areas in the event of ____.

Q3: Match the Column

Match the items in Column A with their corresponding descriptions in Column B.

Q4: True/False

(i) Ocean water is low in salinity and safe to drink.
(ii) Tides are caused by the gravitational pull of the Moon and the Sun.
(iii) Ocean currents play no role in regulating global temperatures.
(iv) Spring tides occur when the Moon and Sun are at right angles to each other.
(v) Tsunami Warning Systems were implemented to prevent thunderstorms.