Science Olympiad Practice Test 1 — NSO-style (Class 7)

Q4. Anil is the brother of Bela. Bela is the daughter of Chitra. Dinesh is the father of Chitra. How is Anil related to Dinesh?

Q5. Meera is facing north. She turns 90° clockwise, then 180° anticlockwise, and then 45° clockwise. Which direction is she facing now?

Q6. In a class of 40 students, Rohan is 12th from the top. Kiran is 5 places below Rohan. What is Kiran's rank from the bottom?

Q7. A mirror is placed on the right of the letters and numbers as shown. Which choice is the mirror image?

Q8. How many triangles are there in the figure below?

Q9. Statements: All pens are boxes. Some boxes are chairs.
Conclusions: I. Some chairs are boxes. II. Some chairs are pens.
Which conclusion(s) follow from the statements?

Q10. What is the angle between the hour hand and the minute hand of a clock at 3:40?

Q11. Which of these is present in a plant cell but NOT in an animal cell?

Q12. Which gas enters a leaf through the stomata and is used by the leaf to make food by photosynthesis?

Q13. A plant has yellow, wire-like stems, no green leaves and no chlorophyll. It winds around a host plant and takes its food from it. This plant is

Q14. In a lichen, a fungus lives together with a partner that has chlorophyll. The fungus gives shelter, water and minerals; the partner makes food for both. The partner is

Q15. In the human body, the digestion of carbohydrates, proteins and fats is completed in the

Q16. The inner wall of the small intestine has thousands of finger-like outgrowths called villi. Their main job is to

Q17. Which of these helps a polar bear to survive in its very cold habitat?

Q18. Which type of soil has the greatest capacity to hold water?

Q19. A steel spoon is left in a cup of hot tea. After some time its handle also becomes hot. Heat reaches the handle mainly by

Q20. On a sunny afternoon at the seaside, a cool breeze blows

Q21. The range of temperature shown on a clinical thermometer is usually

Q22. A yellow turmeric stain on a white shirt turns red when the shirt is washed with soap. This shows that soap solution is

Q23. A few drops of china rose indicator turn a solution green. The solution could be

Q24. An ant bite injects formic acid into the skin. Which of these is best to rub on the bite to relieve the pain?

Q25. Which of these is a chemical change?

Q26. After running a long race, an athlete gets muscle cramps. This is caused by the build-up in the muscles of

Q27. Yeast breaks down glucose in the absence of oxygen. The products are

Q28. When we breathe in (inhale),

Q29. Which animal is NOT correctly matched with the part it breathes through?

Q30. Which blood vessel carries blood that is poor in oxygen from the heart to the lungs?

Q31. The main nitrogen-containing waste that human kidneys remove from the blood in urine is

Q32. New plants can grow from buds on the edges (margins) of the leaves of

Q33. A bus travels 150 km in 2 hours 30 minutes. What is its average speed?

Q34. A simple pendulum completes 30 oscillations in 45 seconds. What is its time period?

Q35. The distance–time graph of a car is shown. What is the speed of the car between the 3rd hour and the 5th hour?

Q36. Which of these appliances does NOT work on the heating effect of electric current?

Q37. How can the strength of an electromagnet be increased?

Q38. Rahul stands 2 m in front of a plane mirror. He then walks 0.5 m towards the mirror. What is the distance between Rahul and his image now?

Q39. A ray of light falls on a plane mirror as shown. It makes an angle of 30° with the surface of the mirror. What is the angle of reflection?

Q40. Which type of mirror is used as the side (rear-view) mirror of a car or scooter, because it gives a wider view of the traffic behind?

Q41. A disc painted with the seven colours of the rainbow is spun very fast. It appears

Q42. A lunar eclipse can take place only on a

Q43. Two astronauts standing close together on the Moon cannot hear each other speak without using radios. The main reason is that

Q44. The straps of a school bag are made wide. This is because wide straps

Q45. The process by which rainwater seeps into the ground and fills up the groundwater is called

Q46. A potted plant was kept in the dark for three days. Then part of one leaf was covered on both sides with a strip of black paper, and the plant was kept in bright sunlight for a day. The leaf was boiled in alcohol and tested with iodine solution. What is the result and what does it show?

Q47. A brick measures 20 cm × 10 cm × 5 cm and weighs 30 N. It can rest on the floor on any one of its faces. What is the greatest pressure it can exert on the floor?

Q48. Three solutions P, Q and R are tested. P turns blue litmus red. Q turns red litmus blue and turns phenolphthalein pink. R does not change the colour of either litmus paper. When P and Q are mixed, the mixture becomes warm. Which set could P, Q and R be?

Q49. A train 200 m long is moving at a steady speed of 54 km/h. How long does it take to cross a bridge 400 m long completely (from the moment the engine enters the bridge until the last coach leaves it)?

Q50. Each circuit below has two identical cells, a switch and an identical bulb (the long thin line of a cell is its positive terminal). In which circuit will the bulb glow?