Science Olympiad For Class 7

1.The most suitable material for making the core of an “Electromagnet” is _______.

a. Iron
b, Brass
c .Steel
d. Aluminium

2. Which gas present in air is essential for aerobic respiration?

a. Nitrogen
b. Oxygen
c. Carbon dioxide
d. All of these

3. When person moves closer to a plane mirror, the size of his image in the mirror

a. Remains the same
b. Increases
c. Decreases
d. First increases and then decreases

4. Which part of the plant is called its food factory ?

a. Fruits
b. Seeds
c. Flowers
d. Leaves

5. Which one is filled in the bulb of a thermometer?

a. Mercury
b. Copper
c. Lead
d, Silver

6. Heat from the sun reaches to us by

a. Conduction
b. Convection
c. Radiation
d. All of these

7. Which of the following set of substances contain acids?

a. Grapes, lime water
b. Curd, vinegar
c. Vinegar, soap
d. Curd, milk of magnesia

8. Which of the following is an acid-base indicator?

a. Vinegar
b. Turmeric
c. Baking soda
d. Lime water

9. Which of the following is a chemical change?

a. Bursting of a fire cracker
b. Germination of seed
c. Coal formation from buried trees
d. All of the above

10. Which is a method to prevent rust?

a. Crystallization
b. Sedimentation
c. Galvanisation
d. None of the above

11. Which among the following is generally not predicted in a daily weather report?

a. Temperature
b. Pressure
c. Humidity
d. Rainfall

12. Rainfall is measured by

a. Rain gauge
b. Water level increase in water table
c. Water level increase in ponds
d. None of the above

13. After heavy exercise, due to the accumulation of which substance we get muscle cramps ?

a. Fumaric acid
b. Malaic acid
c. Lipoic acid
d. Lactic acid

14. Which one shows lateral inversion?

a. Convex mirror
b. Plane mirror
c. Concave mirror
d. All of these

15. In yeasts reproduction occurs by

a. Fragmentation
b. Binary fission
c. Budding
d. Spore formation