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Observation ExploreExperiment

Senior Set C

NOTE 1. Check that this question paper has 16 printed pages. Kindly contact the room invigilator if you find any page missing or not printed. 2. This question paper has 25 multiple choice questions. Every question has 4 options, out of which only ONE is correct. In case more than one option appears to be correct, choose the most suitable option. 3. There will be NO negative marking in any question. 4. You will be given an OMR sheet to answer the questions. You have to fill your answer choice for each question on the OMR sheet. 5. The OMR sheet has to be filled using an HB pencil only. Use of any other kind of pencil or pen is strictly prohibited. 6. The proper way to fill the bubble is to color it completely using the pencil. Do not scribble, cross or tick your bubbles to mark them as answers. 7. Please note that the question paper will NOT be explained in any form whatsoever. 8. At the end of the examination, you are supposed to hand over the OMR sheet to the invigilator. You can take the question paper along with you.

Rough Work

Q1. Arrangements like the one show on the right are called linkages. The given linkage arrangement is fixed at point C. The points A and B are free to move. The horizontal to and fro movement of point B results in

A

movement of point A. Which of the following describes the motion of point A correctly?

C hinged

B

A. Horizontal B. Vertical C. Circular D. Oscillatory

Q2. Three mirrors are placed inside a corridor. We need to check out whether the bulb at the other extreme end is lit or not. Which of the following arrangements of mirrors will allow me to see whether the bulb is lit or not?

A.

B.

C.

D.

Q3. While traveling in a sail boat, I observed that the wind was blowing heavily from my left to right side. Now I need to adjust the sail of my boat so as to keep the boat moving ahead without the fear of boat falling over. Which of the following adjustments of the sail would be most suitable?

Top View A.

C.

B.

D.

Side View

Q4. Little Johnny made a bridge using drinking straws. He wanted to make it strong enough to carry the load of his toy car. Which of the given bridge structures would be the strongest to carry the toy car?

A.

B.

C.

D.

Q5. A person can hold a solid cone in several ways. Which of the following allows maximum grip of hand so that the cone is held tightly?

A.

B.

C.

D. All of the above are equally appropriate ways

Q6. The arrangements shown below has been made by connecting two pulleys. One of the pulleys can be rotated using a hand driven pedal which results in the rotation of the fan connected to the second pulley. The pedals in all the three arrangements are being rotated at the same speed. In which one of the following arrangements would the fan rotate fastest?

A.

C.

C.

D. All the fans will rotate at the same speed

Q7. A triangle is cut out from a larger rectangle. The diagonals of the rectangle intersect at the centre of the triangle. We divide the remaining green area with a single straight line.

.

Which of the following straight cuts will not divide the shaded region into two parts of equal area ?

.

.

A.

B.

.

C.

D. The figure is cut into equal areas in all the above

Q8. A bridge has to be demolished by blasting it at a one particular point. The figure shows 4 points where explosives can be blasted. Which of the following options represents the correct decreasing order of the damage done to the bridge by blasts at these points?

A

B C

D

A. B. C. D.

D>C>B>A C>B>D>A D>A>B>C A>B>C>D

Q9. Gears are systems used for transfer of motion. Given below are the three arrangements of gears. When the gear 1 is rotated it should result in the rotation of the system of gears. Which one of the following arrangements would not work properly to exhibit transfer of motion?

B. A.

Gear 1

Gear 1

C.

D. All of the above would work properly

Gear 1

Q10. Rohit went to the market with his mom. His mom asked him to help her select a suitable bag for carrying groceries. Which one of the following four bags do you think Rohit should suggest so that it is most comfortable for his mom to carry?

A.

B.

C.

D.

Q11. The domino effect is a chain reaction that occurs when a small change causes a similar change nearby, which then will cause another similar change, and so on in linear sequence. Raju prepared a domino set as in the picture. If the first domino is toppled it falls over to the next domino, which in turn falls over the next and so on up to the last domino .

In one of the domino arrangements. There is one vacant space where I need to fit one of the four pieces shown below. Using which one of these, the domino effect is likely to fail ?

A.

B.

C.

D.

Q12. A boat has a ladder that has seven rungs; each rung is one foot apart. The bottom most rung is one foot from the water. The tide rises at twelve inches every 15 minutes. High tide peak is in one hour. When the tide is at its highest how many rungs are under water?

A. B. C. D.

Two Three Five None

OFF

B.

Glass rod

Iron nail

A.

Iron nail

Copper wire

Q13. Lily made an electrical circuit to make a bulb glow, but when she switched it ON bulb did not glow at all! Which of the following circuits was made by Lily?

OFF

ON

OFF

D.

Glass rod

Glass rod

C.

Copper wire

Glass rod

ON

OFF

ON

ON

Q14. Rohan loves to fly kites. He went to the market to buy some kites, where he came across different designs of kites. Which of the kites would be most difficult for Rohan to fly?

A.

B.

C.

D.

Q15. A vase is kept on a table. A magician wants to make it disappear. He keeps the vase on a table and uses mirrors to do the trick. Given below are some arrangements of mirrors. Which one would be successful in making it disappear?

A.

B.

C.

D.

Q16. A billiards room is to be made inside a floating hotel. Which would be the best location to put a billiards table inside this hemispherical hotel? The available rooms are marked by English alphabets A , B, C, D.

D

A. Room A B. Room B

A

C. Room C B

C

D. Room D

Q17. The arrangement below shows the windscreen wiper mechanism of a car. Which of the following options correctly describes the motion of the indicated points A, B and C while the wiper functions normally? C

A

C A

B

B

A. A - rotational, B - oscillatory and C - rotational B. A - oscillatory, B - stationary and C - rotational C.A - stationary, B - rotational and C - oscillatory D. A - stationary, B - oscillatory, C - rotational

Q18. I filled up a water bottle and I tried to push its neck so that it bends over but does not fall. I tried the same experiments on a half filled bottle and also on an empty bottle.

Fully Filled

Half Filled

Empty

Which of the following shows the correct order; of the bottle tilting the most, to the bottle tilting the least before falling over? A. B. C. D.

Fully Filled > Half Filled > Empty Empty > Half Filled > Fully Filled Half Filled = Fully Filled > Empty Half Filled > Fully Filled = Empty

Q19. Which of the following designs of a door knob would be the most comfortable for a small child to open the door?

A.

B.

C.

D.

Q20. A boat rises above the water level as it enters the sea from a river.

River Given below are some reasons. I. Density of sea water is greater than density of river water. II. Density of river water is greater than density of sea water. III. A boat displaces more water in the sea than a river. IV. A boat displaces more water in a river than the sea Which of these reasons is/are correct? A. B. C. D.

Only I is correct. Only II is correct. Both II and III are correct. Both I and IV are correct.

Sea

Q21. A windmill is a good way to make use of renewable natural resources. There are 5 windmills placed in a farm. Given the aerial view and the wind direction which of the following layouts of windmills would be best for generating the maximum amount of electricity with 5 wind mills?

A.

B.

D. All of the above would generate the same

C.

amount of electricity.

Q22. Given are a few arrangements of different kinds of gears. Such arrangements are used to convert one kind of motion to another. Which of the following pairs of gears can be used to convert circular motion to linear motion?

A.

B.

C.

D.

Q23: Different porters (also known as a coolie) have different ways in which they carry luggage. Which one among the following porters appears to be the most experienced? (Hint: An experienced porter learns to minimize the pressure on his fingers due to heavy luggage apart from balancing weights around him)

A.

B.

C.

D. All the porters seem to be equally experienced

Q24. The figure below shows the shape of a boat. Which one of the marked places according to you would be the best suited place for keeping a very heavy load so that the boat stays stable while sailing?

C 1 ton A B D

Q25. Shown below are two different kinds of trolleys used for carrying heavy loads. Assume that both the trolleys have the same load carrying capacity and are used to carry equal weight.

A.

B.

The following statements are based on the structure of the trolleys. I. Same effort is required to push or to pull Trolley B II. Same effort is required to push or to pull Trolley A III. Trolley A would require more effort than Trolley B IV. Trolley B would require more effort than Trolley A Which of the above statements is/are correct? A. Only I and III are correct. B. Only II and IV are correct. C. Only I, II and III are correct. D. Only III is correct.

END OF PAPER

Rough Work

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