Master the complexities of the new 2026 CBSE Science syllabus with our “Hard” difficulty MCQ set. These questions are specifically designed to test analytical thinking, numerical application, and deep conceptual integration. Perfect for students aiming for 100% in their school exams and those preparing for competitive talent searches like the Science Olympiad.
Class 7 Science CBSC MCQ Hard
Question 1 of 20
A solution of an unknown substance turns phenolphthalein indicator pink. What will happen when blue litmus is dipped into it?
Question 2 of 20
In the human heart, the separation between the left and right sides is essential because it:
Question 3 of 20
During the process of photosynthesis, what is the correct sequence of energy transformation?
Question 4 of 20
In a concave mirror, if an object is placed exactly at the focus (F), where will the image be formed?
Question 5 of 20
The process of 'Ruminant' digestion is unique because:
Question 6 of 20
Which of the following is a result of anaerobic respiration in human muscle cells that leads to fatigue?
Question 7 of 20
An object moves at 54 km/h. How much distance will it cover in 20 seconds?
Question 8 of 20
In the context of the sexual reproduction of plants, which part develops into a seed after fertilization?
Question 9 of 20
If a solution reacts with crushed eggshells to give a gas that turns lime water milky, the solution contains:
Question 10 of 20
Which of the following processes involves the simultaneous occurrence of evaporation and condensation to purify liquids?
Question 11 of 20
A real image is always:
Question 12 of 20
What is the effect of 'Sweating' on the human body based on the principle of latent heat?
Question 13 of 20
Which of the following is an example of a chemical change that is also exothermic?
Question 14 of 20
Two plane mirrors are placed parallel to each other. How many images of an object placed between them will be formed?
Question 15 of 20
In the context of forest ecosystems, 'Decomposers' help in maintaining the supply of nutrients to the growing plants by:
Question 16 of 20
Which of the following describes 'Dialysis'?
Question 17 of 20
A simple pendulum takes 32 seconds to complete 20 oscillations. What is the time period of the pendulum?
Question 18 of 20
White light is passed through a glass prism and splits into its component colors. Which color deviates the most?
Question 19 of 20
Which of the following is not a characteristic of 'Loamy' soil?
Question 20 of 20
When magnesium ribbon is burnt in air, it produces a white ash. The aqueous solution of this ash is:
Frequently Asked Questions (FAQ)
Q1: What defines a “Hard” level question in Class 7 Science?
A: “Hard” level questions require higher-order thinking skills (HOTS). Instead of direct recall, these questions involve multi-step logic—such as converting units before calculating speed or predicting how an indicator will react based on a prior chemical reaction.
Q2: Does this set include numerical problems?
A: Yes. This set includes calculations for the time period of a pendulum, speed-distance-time conversions, and the number of images formed by mirrors, which are critical for the 2026 exam pattern.
Q3: Are these questions relevant for the 2026 ‘Poorvi’ Science textbook?
A: Absolutely. While the difficulty is elevated to challenge top-performing students, the content remains strictly within the framework of the latest CBSE 2026 curriculum.
Q4: How can I improve my score on these advanced MCQs?
A: Focus on the “Why” behind each answer. Read the provided explanations carefully, as they bridge the gap between basic theory and complex application.
Q5: Is this set helpful for competitive exams?
A: Yes, the logical depth of these questions mirrors the pattern of the National Science Olympiad (NSO) and other state-level scholarship exams.