High Order Thinking Skills (HOTs) - 6 - Class 3 MCQ

Light energy is responsible for enabling us to see objects. When light reflects off or is emitted by an object and enters our eyes, it interacts with the cells in our retina, triggering a series of electrical signals to the brain, which interprets them as images

The term that matches the description is "FREQUENCY." Frequency is the number of vibrations per second and is responsible for determining the pitch of a sound. Higher frequency corresponds to higher pitch, while lower frequency corresponds to lower pitch. When unscrambled, option (C) becomes "FREQUENCY," making it the correct answer. Therefore, option (C) is correct.

The correct pairing for each environmental term with its definition is as follows:
(a) Biodiversity - (i) The variety of life in all its forms, including species, ecosystems, and genetic diversity
(b) Deforestation - (ii) The clearing, destroying, or removal of forests
(c) Pollution - (iii) Contamination of the environment by harmful substances
(d) Decomposition - (iv) The process of gradual breakdown of organic matter into simpler substances

Thus, the correct answer is:
D) (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

The type of pollution caused by excessive amounts of nitrogen and phosphorus entering water bodies, leading to the overgrowth of algae and depletion of oxygen levels, is known as water pollution. This can have harmful effects on aquatic ecosystems and human health.

Explanation:
 

• Vibration is the main cause of the drum producing sound.


• When Max hits the drum with the drumstick, it creates vibrations in the drumhead.


• These vibrations travel through the air as sound waves, reaching our ears and allowing us to hear the sound of the drum.


• Without vibrations, the drum would not produce any sound.


 

When unscrambled, option (A) becomes "RECYCLING," which is the correct term for the process described. Recycling involves the conversion of harmful pollutants into less harmful substances, contributing to environmental sustainability. Therefore, option (A) is correct.

When you push the ball with your hand, you apply a force to it. This force, known as the push force or the applied force, makes the ball start moving.

Cutting down too many trees, also known as deforestation, is harmful because trees help keep the air clean and provide homes for many animals. When we cut down trees, it can make the air dirty and take away the places where animals live. Trees are important for keeping the environment healthy for all living things.

The correct pairing for each type of force with its definition is as follows:
(a) Gravity - (iii) Force exerted by an object due to its weight and the acceleration due to gravity
(b) Friction - (i) Force exerted by a surface as an object moves across it or makes an effort to move across it
(c) Tension - (iv) Force exerted by a stretched object, such as a rope or cable
(d) Magnetic - (ii) Force exerted by a magnetic field on a magnetic object

Thus, the correct answer is:
C) (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

When unscrambled, option (D) becomes "EVAPORATION," which is the correct term for the natural process described. Evaporation is the process by which water changes from a liquid to a gas or vapor and enters the atmosphere from the Earth's surface. It is a crucial component of the water cycle. Therefore, option (D) is correct.