Class 7 Science Olympiad Question Paper SET 1

Class 7 Science Olympiad Question Paper SET 1

 

Class 7 Science Olympiad question paper set 1 with answers. Practice NSO Level 2 MCQs, HOTS and higher-order science questions for Olympiad preparation.

 

SECTION A – SCIENCE (1 mark each)

1. A student forms images using four devices: a plane mirror, a convex mirror, a projector and a concave mirror. Which statement is correct?

(A) Plane and convex mirrors always form virtual images, while a projector forms a real image on a screen.

(B) All four devices always form virtual images.

(C) A projector and a plane mirror form real images.

(D) A concave mirror can never form a virtual image.

2. A bulb filament glows when current passes through it. An electric fuse melts when excessive current flows. Which common effect of electric current is involved in both cases?

(A) Chemical effect

(B) Heating effect

(C) Magnetic effect

(D) Cooling effect

3. Two wires P and Q of the same material and length have different thicknesses. P is thinner than Q. They are connected separately to the same battery. Which is most likely true?

(A) P has lower resistance and gets less heated.

(B) P has higher resistance and may get more heated.

(C) Q has higher resistance because it is thicker.

(D) Both have exactly the same resistance.

4. A bimetallic strip is made of metals X and Y. On heating, it bends towards Y. What can be concluded?

(A) Y expands more than X.

(B) X expands more than Y.

(C) Both expand equally.

(D) Neither metal expands.

5. A car’s odometer reads 24,680 km at 8:00 a.m. and 24,695 km at 8:25 a.m. If it moved uniformly, how far would it travel by 8:40 a.m. from 8:00 a.m.?

(A) 18 km

(B) 21 km

(C) 24 km

(D) 30 km

6. A ray of white light passes through a prism. Which colour is deviated the most?

(A) Red

(B) Yellow

(C) Green

(D) Violet

7. Which sequence shows increasing deviation of colours through a glass prism?

(A) Violet → Indigo → Blue → Green → Yellow → Orange → Red

(B) Red → Orange → Yellow → Green → Blue → Indigo → Violet

(C) Red → Violet → Green → Blue → Yellow → Orange → Indigo

(D) Green → Yellow → Red → Violet → Blue → Orange → Indigo

8. During daytime near a seashore, land becomes warmer than sea. Which air movement is expected?

(A) Air rises over sea and moves towards land at high altitude.

(B) Cooler air from sea moves towards land near the surface.

(C) Cooler air from land moves towards sea near the surface.

(D) No convection current is produced.

9. Two trains move from the same station in the same direction. Train P moves at 72 km/h and train Q at 60 km/h. Which statement is correct?

(A) They have the same speed and same velocity.

(B) They have different speeds and different velocities.

(C) They have different speeds but the same velocity.

(D) They have the same speed but different velocities.

10. A cyclist covers 300 m in 20 s and then 200 m in 10 s. What is the average speed for the entire journey?

(A) 15 m/s

(B) 16.7 m/s

(C) 20 m/s

(D) 25 m/s

11. A sharp image of a candle is formed on a screen by a concave mirror. If the candle is moved slightly towards the mirror, what may be required to regain a sharp image?

(A) The screen position may need adjustment.

(B) The mirror must be replaced by a plane mirror.

(C) The candle must always be removed.

(D) Nothing can produce a sharp image again.

12. Which observation proves that an image is real?

(A) It is upright.

(B) It can be obtained on a screen.

(C) It is smaller than the object.

(D) It appears behind a mirror.

13. A concave mirror is used as a shaving mirror because, for a suitably placed face, it forms an image that is

(A) real, inverted and smaller

(B) virtual, upright and magnified

(C) real, upright and magnified

(D) virtual, inverted and smaller

14. Which of the following would best protect a circuit from an abnormally large current?

(A) A thick copper wire used as a fuse

(B) A fuse wire of suitable low melting point

(C) A plastic wire

(D) A permanent magnet

15. A heater rated for a fixed voltage is switched on. Which energy conversion mainly occurs?

(A) Electrical to chemical

(B) Electrical to heat

(C) Heat to electrical

(D) Magnetic to light

16. A student sees lightning and hears thunder 5 s later. The delay mainly occurs because

(A) light travels slower than sound

(B) sound travels slower than light

(C) both travel at the same speed

(D) thunder is produced after lightning reaches the ground

17. A ray of light strikes a plane mirror at 35° to the normal. The angle between incident and reflected rays is

(A) 35°

(B) 55°

(C) 70°

(D) 110°

18. An object is placed 2 m in front of a plane mirror. The distance between the object and its image is

(A) 1 m

(B) 2 m

(C) 4 m

(D) 8 m

19. A wind vane changes direction frequently during a storm. It is primarily measuring changes in

(A) wind speed

(B) wind direction

(C) air temperature

(D) rainfall

20. Warm air rises mainly because, on heating, it

(A) becomes denser

(B) becomes less dense

(C) loses all mass

(D) stops exerting pressure

SECTION B – ACHIEVERS / HIGHER ORDER THINKING (2 marks each)

21. A student records the following distance travelled by a toy car: at 0 s = 0 m, 2 s = 6 m, 4 s = 12 m, 6 s = 18 m. Another car covers 20 m in 5 s. Which conclusion is correct?

(A) First car is non-uniform; second is faster.

(B) First car moves uniformly at 3 m/s; second car is faster at 4 m/s.

(C) Both cars move at 3 m/s.

(D) First car is faster than second.

22. A bulb, a fuse and an electric heater are compared. Which row correctly matches their working parts and effects?

(A) Bulb—filament/heating; Fuse—low-melting wire/heating; Heater—resistance element/heating

(B) Bulb—element/magnetic; Fuse—filament/chemical; Heater—fuse wire/magnetic

(C) Bulb—glass/heating; Fuse—copper rod/magnetic; Heater—plastic/chemical

(D) All work mainly because of the magnetic effect.

23. A student places an object at different positions before a concave mirror. At position X the image is caught on a screen; at position Y it cannot be caught and appears enlarged. Which inference is best?

(A) At X the image is virtual; at Y it is real.

(B) At X the image is real; at Y it is virtual.

(C) Both images are always real.

(D) Both images are always virtual.

24. Four statements about prism dispersion are given: (i) white light contains several colours; (ii) violet deviates more than red; (iii) a prism creates colours that were absent in white light; (iv) the separated band is called a spectrum. Which are correct?

(A) (i), (ii) and (iv) only

(B) (i) and (iii) only

(C) (ii) and (iii) only

(D) All four

25. A coastal town experiences a sea breeze during the day and a land breeze at night. What causes the reversal?

(A) Sea and land heat and cool at different rates.

(B) The Sun changes the direction of Earth’s rotation.

(C) Air stops expanding at night.

(D) Sea water has no temperature change.

26. A car travels 12 km from 7:30 to 7:50 and 18 km from 7:50 to 8:20. Which statement is correct?

(A) Its speed is constant throughout.

(B) Average speed for the whole trip is 36 km/h.

(C) Average speed for the whole trip is 30 km/h.

(D) It covers equal distances in equal time intervals.

27. An electrician has fuse wires P, Q and R. P melts at the lowest temperature, Q at a moderate temperature and R at a very high temperature. For a domestic safety fuse, why is a suitably rated low-melting wire preferred?

(A) It breaks the circuit before excessive heating can damage appliances.

(B) It increases current until appliances work faster.

(C) It converts current into magnetism.

(D) It prevents any current from flowing during normal use.

28. A student stands 1.5 m in front of a plane mirror and then walks 0.5 m towards it. By how much does the distance between the student and image decrease?

(A) 0.5 m

(B) 1.0 m

(C) 1.5 m

(D) 2.0 m

29. A train moves east at 50 km/h and another moves west at 50 km/h. Which statement is correct?

(A) Their speeds and velocities are both equal.

(B) Their speeds are equal but velocities are different.

(C) Their velocities are equal because the magnitudes are equal.

(D) Their speeds are different but velocities are equal.

30. A classroom experiment must distinguish between a real and a virtual image without touching the optical device. Which test is most reliable?

(A) Check whether the image is colourful.

(B) Try to obtain the image sharply on a screen.

(C) Measure whether the image is upright.

(D) Observe whether the image looks bright.

 

 

ANSWER KEY – FOR TEACHER USE

Q	Ans	Q	Ans	Q	Ans
1	A	11	A	21	B
2	B	12	B	22	A
3	B	13	B	23	B
4	B	14	B	24	A
5	C	15	B	25	A
6	D	16	B	26	B
7	B	17	C	27	A
8	B	18	C	28	B
9	B	19	B	29	B
10	B	20	B	30	B

 

Paper design note: This is an practice paper inspired by the NSO Level 1 Class 7 sample’s higher-order MCQ style, including optics, heating effect of current, bimetallic strips, motion/odometer reasoning, dispersion, wind flow and speed/velocity concepts.