High Order Thinking Skills (HOTs) - 1 - Class 5 MCQ

Let's examine each statement:

1. (i) Magnets have two poles, north and south.
   This statement is correct. All magnets have two poles: a north pole and a south pole.

2. (ii) Like poles attract each other.
   This statement is incorrect. Like poles (north-north or south-south) repel each other, not attract.

3. (iii) Magnets can attract only metals.
   This statement is incorrect. Magnets primarily attract ferromagnetic materials like iron, nickel, and cobalt, but not all metals are magnetic. For example, aluminum and copper are non-magnetic.

4. (iv) Opposite poles repel each other.
   This statement is incorrect. Opposite poles (north-south) attract each other, not repel.

Thus, the incorrect statements are (ii) and (iii), making the correct answer B: (ii) and (iii) only.

For electricity to flow, a circuit must be closed, not open. Let’s analyze the statements:

(i) A circuit must be open for electricity to flow: This is incorrect. A circuit must be closed to allow electricity to flow.
(ii) Conductors allow electricity to pass through them: This is correct. Materials like metals are conductors and allow electricity to pass.
(iii) Insulators prevent electricity from passing through: This is correct. Insulators like rubber stop electricity from flowing.
(iv) A switch can open or close a circuit: This is correct. A switch controls the flow of electricity by opening or closing the circuit.

Thus, the only incorrect statement is (i). Therefore, the correct answer is Option B.

Transpiration is the process of water movement through plants, not rivers. Evaporation, condensation, and precipitation are correctly described.

(i) Camouflage helps animals blend into their environment: This is correct. Camouflage helps animals hide from predators or prey.
(ii) Mimicry is when animals look like other animals or objects: This is correct. Mimicry helps animals avoid predators by resembling something else.
(iii) Hibernation is a state of increased activity during winter: This is incorrect. Hibernation is a state of decreased activity, where animals conserve energy by slowing down their metabolism during winter.
(iv) Migration is the movement of animals to find food or breed: This is correct. Migration involves seasonal movement of animals for survival needs.

Thus, the only incorrect statement is (iii). Therefore, the correct answer is Option B.

(i) Water freezes at 0 degrees Celsius: This is correct. Water turns into ice at 0°C.
(ii) The sun is a planet: This is incorrect. The sun is a star, not a planet.
(iii) Plants produce oxygen during photosynthesis: This is correct. Plants release oxygen as a byproduct of photosynthesis.
(iv) The Earth has one moon: This is correct. The Earth is accompanied by a single natural satellite, the Moon.

Thus, the correct statements are (i), (iii), and (iv). Therefore, the correct answer is Option C.

(i) The boiling point of water is 100 degrees Celsius: This is correct. Water boils at 100°C under normal atmospheric pressure.
(ii) Photosynthesis occurs in the leaves of plants: This is correct. Photosynthesis primarily takes place in the chloroplasts of leaf cells.
(iii) A magnet has a north and south pole: This is correct. All magnets have two poles, north and south.
(iv) Humans have three lungs: This is incorrect. Humans have two lungs, one on the left and one on the right.

Thus, the correct statements are (i), (ii), and (iii). Therefore, the correct answer is Option C.

(i) Plants take in carbon dioxide and give out oxygen: This is correct. Plants release oxygen during photosynthesis while absorbing carbon dioxide.
(ii) Metals are poor conductors of electricity: This is incorrect. Metals are good conductors of electricity.
(iii) A lever is a simple machine: This is correct. A lever is a basic tool that helps make work easier.
(iv) The Earth revolves around the moon: This is incorrect. The Earth revolves around the Sun, not the Moon.

Thus, the correct statements are (i) and (iii). Therefore, the correct answer is Option A.

(i) A shadow is formed when light is blocked by an object: This is correct. Shadows are created when an object obstructs the path of light.(ii) Sound cannot travel through a vacuum: This is correct. Sound requires a medium like air, water, or solids to travel and cannot propagate in a vacuum.
(iii) The Earth is the third planet from the sun: This is correct. Earth is the third planet in the solar system, located between Venus and Mars.(iv) Bacteria are visible to the naked eye: This is incorrect. Bacteria are microscopic organisms and can only be seen using a microscope.

Thus, the correct statements are (i), (ii), and (iii). Therefore, the correct answer is Option B.

(i) Leaves are green because of chlorophyll: This is correct. Chlorophyll is the pigment responsible for the green color of leaves.
(ii) Electricity can be generated from sunlight: This is correct. Solar panels convert sunlight into electricity.
(iii) Mammals lay eggs: This is incorrect. Most mammals give birth to live young, with only a few exceptions like the platypus and echidna.
(iv) Water is essential for all known forms of life: This is correct. Water is crucial for the survival of all living organisms.

Thus, the correct statements are (i), (ii), and (iv). Therefore, the correct answer is Option C.