KENDRIYA VIDYALAYA STEEL PLANT - CLASS VII SCIENCE SAMPLE PAPER (SET 1)
1. Adolescence is a period of rapid growth and development, typically occurring between which ages?
(a) 0–5 years
(b) 5–10 years
(c) 10–19 years
(d) 20–30 years
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Answer: (c) 10–19 years
2. In adolescent boys, a bump in the throat region caused by the growth of the voice box is called:
(a) Thyroid
(b) Adam’s apple
(c) Alveoli
(d) Rumen
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Answer: (b) Adam’s apple
3. Which process of heat transfer takes place from the hotter part of an object to the colder part without the particles moving from their positions?
(a) Radiation
(b) Convection
(c) Conduction
(d) Infiltration
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Answer: (c) Conduction
4. The SI unit of time is:
(a) Minute
(b) Hour
(c) Second
(d) Ghati
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Answer: (c) Second
5. Speed is calculated as:
(a) Total distance covered / Total time taken
(b) Total distance covered × Total time taken
(c) Total time taken / Total distance covered
(d) Total time taken + Total distance covered
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Answer: (a) Total distance covered / Total time taken
6. The human small intestine is approximately how many metres long?
(a) 1.5 metres
(b) 3 metres
(c) 6 metres
(d) 10 metres
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Answer: (c) 6 metres
7. Which organ in the human digestive system secretes bile?
(a) Pancreas
(b) Stomach
(c) Liver
(d) Small Intestine
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Answer: (c) Liver
8. During inhalation, the diaphragm moves:
(a) Upwards
(b) Downwards
(c) Inwards
(d) Backwards
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Answer: (b) Downwards
9. In comparison to inhaled air, exhaled air contains more:
(a) Oxygen
(b) Nitrogen
(c) Carbon dioxide
(d) Hydrogen
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Answer: (c) Carbon dioxide
10. The role of mucus in the stomach is to:
(a) Digest proteins
(b) Kill bacteria
(c) Protect the stomach lining from acid
(d) Churn the food
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Answer: (c) Protect the stomach lining from acid
11. Case: Digestion Discovery
In 1822, a man named Alexis St. Martin was accidentally shot in the stomach. He was treated by Dr. William Beaumont. His wound never fully healed, leaving a small permanent hole that allowed Dr. Beaumont to observe digestion happening in real-time. He studied how different foods were broken down and the effects of emotions on digestion.
Questions:
(i) Who was the doctor who observed digestion through a stomach wound? (1M)
(ii) What does the stomach secrete to break down proteins? (1M)
(iii) How does the stomach prepare food for the next stage of digestion? (2M)
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(i) Dr. William Beaumont. (ii) Digestive juice. (iii) The stomach contracts and relaxes to churn food, mixing it with secretions to transform it into a semi-liquid mass.
12. Case: Coastal Breezes
People living in coastal areas experience land and sea breezes. During the day, land heats up faster than the sea, causing warm air to rise and cooler air from the sea to move in. At night, the process reverses as land cools faster than the sea.
Questions:
(i) What is the movement of cooler air from sea to land called? (1M)
(ii) When does land breeze occur? (1M)
(iii) Which process of heat transfer causes these breezes? (2M)
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(i) Sea breeze. (ii) At night. (iii) Convection, where heat transfer takes place by the actual movement of particles.
13. Match Column A with Column B:
(i) Nostrils (a) Exchange of gases in lungs
(ii) Large Intestine (b) Stores groundwater
(iii) Aquifers (c) Entry point for fresh air
(iv) Alveoli (d) Absorbs water and salts
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(i)-(c), (ii)-(d), (iii)-(b), (iv)-(a)
14. What are hormones and what is their role?
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Hormones are certain chemicals produced in our bodies that regulate various aspects of growth and development. They are released at appropriate times in response to signals from the brain.
15. Why do we prefer wearing woollen clothes in winter?
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Woollen fabric traps air in its pores; since air is a poor conductor of heat, it reduces heat flow from our bodies. This helps keep us warm by preventing body heat from escaping to the surroundings.
16. Define uniform linear motion with an example.
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Uniform linear motion occurs when an object moves along a straight line at a constant, unchanging speed. An example is a train moving at a constant speed between two points.
17. What is the function of the finger-like projections in the small intestine?
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Thousands of finger-like projections in the small intestine increase the surface area for efficient nutrient absorption. They allow digested nutrients to pass into the blood vessels in the intestinal wall.
18. Define the process of infiltration.
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Infiltration is the process of surface water seeping through soil and rocks beneath the surface of the Earth. It is more efficient when spaces between soil particles are wide and interconnected.
19. Explain the three different processes by which heat gets transferred in nature.
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Heat is transferred via conduction, convection, and radiation. In conduction, particles transfer heat to neighbours without moving; in convection, heat transfer occurs through actual particle movement. Radiation does not require a medium and transfers heat directly from hot objects. All three processes can be observed simultaneously, such as when heating water in a pan.
20. Describe the pathway and process of human digestion from the mouth to the stomach.
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Digestion starts in the mouth where teeth break down food mechanically and saliva digests starch into sugars. The tongue helps swallow softened food into the oesophagus, which uses wave-like motions to push food down. In the stomach, walls churn the food while mixing it with digestive juices and acid that break down proteins. This semi-liquid mass then moves into the small intestine for further digestion and absorption.
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