First, multiple-choice questions (this question contains 5 small questions)

1. Regarding the mass of an object, the following statement is true ().

The quality of an object depends on how many substances it contains, and quality is an attribute of the object itself.

B. the mass of an object is weighed by a balance.

The mass of c 3.5× 107mg may be the mass of a pupil.

D. The internationally accepted unit of mass is kilogram, which is equal to the mass of the original international kilogram instrument of the International Bureau of Metrology in Paris.

When a classmate adjusts the balance of the balance, he always adjusts the imbalance. The possible reason is that the following statement is true ()

A. the left and right trays are placed upside down. B the wandering code is not set at the zero line of the ruler.

C. The blade on the beam is out of the groove. D. the mass of the balance nut is too small.

3. The correct understanding of the density formula ρ= m/V is ()

The density ρ of a substance is directly proportional to its mass m.

B. the mass m of a substance is directly proportional to its volume v.

The density ρ of substance C is inversely proportional to its volume v.

D density is a characteristic of matter, which has nothing to do with its mass and volume.

4.(05 Eleven cities in Liaoning Province (non-curriculum reform area) Xiaoyan made an image of the relationship between the density and volume of four solids as shown in the figure when studying the density of objects. According to the image, the following statement is true ().

A.ρ 1>ρ2>ρ3>ρ4

B.ρ4>ρ3>ρ2>ρ 1

At the same volume, the mass of solid 4 is the largest.

D solid 1 has the largest mass at the same volume.

5. The following statement about density is true ().

A. density is a characteristic of matter itself. Therefore, the density of the same substance will not change with the change of external conditions.

B The unit of density is kg/m3, which is greater than g/cm3.

C. Different kinds of substances usually have different densities.

D generally speaking, iron is heavier than wood, that is to say, the density of iron is greater than wood.

Second, multiple-choice questions (this question contains 34 small questions)

6.(04 Chenzhou, Hunan) The quality of ordinary middle school students is the closest ()

A. 45 kg B.45g c. 450 kg D.4t

7.(05 Suzhou) The quality of one-dollar coins is the closest to ()

A.0.5g B.5g C.50g D.500g

8.(05 Yichang City) The mass of the following objects is closest to 2kg ().

A. an apple b a rooster c a physics book d a table.

9.(03 Yancheng) Among the following objects, the one with a mass of about 2× 105mg is ().

A. A thumbtack B. A physical textbook for Grade Two, C. A desk D. A wooden chair.

10. The following statement about quality is true ().

A. When writing on the blackboard, the quality of chalk remains unchanged. B. When water turns into ice, its mass remains unchanged.

C. When a pot of water is heated to boiling, its mass remains unchanged. One kilogram of iron is bigger than one kilogram of cotton.

1 1.(05 Hebei Curriculum Reform Area) Tray balance is a common instrument in scientific experiments. The following statement about its usage is incorrect ()

A. Before weighing the object, the mass of the measured object should be estimated to avoid exceeding the range.

B. When weighing, move the traveling code to the right, which is equivalent to adding weight to the plate on the right.

C whether the table top is horizontal or not, it can be weighed by leveling the beam.

D. Don't weigh chemicals directly on the tray.

12. Before using the pallet scale, you need to: ① adjust the nut at the right end of the balance bar to balance the balance bar; (2) Put the wandering code on the zero line at the left end of the ruler; ③ Place the balance on a horizontal platform. The reasonable order of the above three steps should be ().

A.③②① B. ①③② C. ②①③ D. ①②③

13.(04 Wuhu) Regarding the use of the balance, the following statement is true ().

A. Move the adjusted balance to another place for use without readjusting.

B. When judging whether the balance beam is balanced, be sure to wait until the pointer stops completely.

C. When the weight is taken out of the weight box, it must be taken with tweezers.

After the balance beam is balanced, the trays can be interchanged.

14. Put a piece of metal in the left plate of the adjusted balance, and add and subtract weights in the right plate with tweezers, but the balance cannot be restored. At this time, it should be ().

A. exchange two trays. Place the object on the right plate of the balance for measurement.

C. adjust the balance nut of balance d. Use the walking code.

15. The weight of the balance is worn, so it is used to measure the mass of the object, and its measurement result ().

A. Too big B. Too small C. Doesn't affect D. Can't be sure

16. Xiao Ming forgot to set the roaming code to zero first when adjusting the balance, so he used this balance to measure the mass of the object ().

A. the measured value is equal to the true value B. The measured value is less than the true value.

C. the measured value is greater than the true value. D. the conditions are insufficient to judge.

17. Weighing the mass of an object with a balance in the cockpit of a spacecraft running in space, the result is ().

A. the measured quality is the same as that measured on earth.

B. the measured mass is greater than that measured on the earth.

C. the measured mass is smaller than that measured on the earth.

D. you can't weigh an object with a balance.

18. In order to measure the quality of a bottle of oil, some students adopted the following steps: (1) move the balance nut to balance the beam; (2) After pouring the oil into the bottle, weigh the total mass of the oil and the bottle; (3) Put the bottle on the left plate and weigh the quality of the bottle; (4) arrange balance; (5) Place the balance on a horizontal platform; (6) Put the roaming code in the left zero position. The following statement is true ()

A. There are no steps, and the sequence is (5)(6)( 1)(3)(2)(4).

B. There are no steps, and the sequence is (4)(5)(6)( 1)(3)(2).

C. Missing step "(7) The quality of oil is equal to the quality of bottle and oil minus the quality of bottle", and the sequence is (5)(6)( 1)(3)(2)(7)(4).

D. Missing step "(7) The quality of oil is equal to the quality of bottle and oil minus the quality of bottle", and the sequence is (4)(5)(6)( 1)(3)(2)(7).

19. When weighing the object, some students mistakenly put the object on the right plate and the weight on the left plate. If the balance is balanced, the mass of the weight is 100g, and the scale value of the stray code on the scale is 2 g, then the mass of the object should be ().

A.B. 98g C.104g D.96g.

Pan Xiao used Tian Ping to measure the average quality of each piece of paper in a book, which has 200 pages in total. After adjusting the balance, she put the book on the left plate, increased the weight on the right plate, and moved the code to the balance. At this time, the weight of the right board is 140g, and the number of traveling yards is 2.5g, so the quality of each piece of paper is close to which of the following values ().

A.140g b.2.5g c.0.7g d.1.4g.

2 1.(02 Chaoyang District, Beijing) The rubber used by students has not changed for a period of time ().

A. shape b density c mass d volume

22.(05 Yichang City) After drinking half of a bottle of pure water, compare the remaining half bottle of water with the original bottle ()

A. the mass decreases and the density remains the same. B. the quality is unchanged and the density is unchanged.

C. the volume decreases and the density decreases. D. the volume remains unchanged and the density decreases.

23.(05 Tianjin) The density of substance A is 2.5t/m3, that of substance B is 2.5kg/dm3, that of substance C is 2.5g/cm3, and that of substance D is 250kg/m3, among which the substance with the lowest density is ().

Antidepressants.

24.(05 Beijing) The following statement is true ()

After a brick is cut into two pieces of equal volume, the density of the brick becomes half of the original.

B The density of iron is greater than that of aluminum, which means that the mass of iron is greater than that of aluminum.

The density of C copper is 8.9 x 103kg/m3, which means that the mass of lm3 copper is 8. 9 x 103 kg.

Two objects with different densities must have different masses.

25. The image of the relationship between the mass m and the volume v of the three substances A, B and C is shown in the figure. As can be seen from the figure, the relationship between the densities ρA, ρB and ρC of the three substances is ().

A.ρA & gt； ρB& gt； ρC

B.ρA & lt； ρB& lt； ρC

C.ρA=ρB=ρC

D. unable to judge

26. Inflate bicycle tires, the air density in the tires ()

A. Larger B. Smaller C. Constant D. Uncertain

27. There is one graduated cylinder of "100 ml", "200 ml" and "500ml" at present, and the minimum graduation values are "1 ml", "100 ml" and "20ml" respectively. If the volume of100g alcohol needs to be measured once,

A. "100 ml" measuring cylinder B. "200 ml" measuring cylinder

C. "500 ml" measuring cylinder D. Either one will be fine.

28.(00 Hainan) The air quality of an ordinary classroom is about (the air density is about 1.29kg/m3) ().

A. 3.0 kg b. 30 kg c. 300 kg d. 3000 kg

29. The density of ice is 0.9 g/cm3. After a piece of ice 1 m3 melts into water, the following conclusion is correct ().

A. The mass remains unchanged, but the density increases, and the volume is 1 m3.

C the mass becomes smaller, the density remains unchanged, and the volume is 0.9 m3.

B the mass becomes smaller, the density remains unchanged, and the volume is 1 m3.

D the mass is constant, the density is increased, and the volume is 0.9m3..

30.(04 Xiangfan) Immerse a copper block and an aluminum block with the same mass into two cups with the same size and shape, and the two cups will not overflow when filled with water. The following judgment is correct (ρ copper >; ρ aluminum) ()

A. put more water in the aluminum block. B. put more water in the copper block.

C.there are as many as two glasses of water. This is impossible to judge.

3 1. As shown in the figure, A, B and C are three identical cylindrical containers, and alcohol, sulfuric acid and brine with the same mass are respectively put into these three containers. It is known that ρ sulfuric acid >: ρ brine > ρ alcohol, and the three containers are filled with () in turn.

A. sulfuric acid, brine and alcohol B. brine, alcohol and sulfuric acid

C. Alcohol, sulfuric acid and brine

32. Three hollow spheres of equal mass are made of copper, iron and aluminum. If the volumes of the hollow parts are equal, the volume of the ball is ().

A. the biggest copper ball is B. the biggest iron ball is C. the biggest aluminum ball is D.

33. Made of copper, iron and lead with equal mass into hollow spheres with equal volume (ρ lead >; ρ copper > ρ iron), the largest hollow part is ()

A. copper ball B. iron ball C. shot put D. same size

34. The density of some edible oils was measured by balance and measuring cylinder in the laboratory. Among the following practical steps, the unnecessary and unreasonable operation step is ().

A. measure the mass of an empty beaker with a balance

B. Pour a proper amount of oil into a beaker, and measure the total mass of the cup and oil with a balance.

C. Pour the oil in the beaker into the measuring cylinder and read the volume of the oil.

D. Measure the quality of the beaker with a balance after pouring the oil.

35.(04 Ning 'an? In the following four groups of equipment, can measure the density of irregular stone is ()

(1) scales, balances and weights (2) scales and weights, measuring cylinders, water and thin wires.

(3) Spring dynamometer, ruler and thin steel wire

(4) spring dynamometer, water, thin thread and beaker

A.(2)(4)b .(2)(3)c .( 1)(2)(3)d .(2)(3)(4)

36.(04 Xinjiang Construction Corps) The mass ratio of A and B is 3: 2 and the volume ratio is 1: 3, so their density ratio is ().

a . 1∶2 b . 2∶ 1 c . 2∶9d . 9∶2

37.(0 1 Heilongjiang) Xiaoming uses plastic barrels of soybean oil, which can hold up to 5 kilograms of water, so the quality of soybean oil in the barrel is ()

A. more than 5 kg B. less than 5 kg C. must be equal to 5 kg D. may be equal to 5 kg.

There is an oxygen cylinder in the hospital. Its container is 10dm3, which contains oxygen with a density of 2.5kg/m3. When using 5g oxygen to rescue patients, the density of remaining oxygen in the bottle is ().

A. 1 kg/m3 b.2kg/m3 c.2.2kg/m3 d.2.5kg/m3

39.(04 Linyi) A glass bottle with a mass of 0.25 kg weighs 1.5 kg after being filled with water. If the liquid is weighed as 1.75 kg, then the density of the liquid is ().

A. 1.75× 103 kg/m3

C.1.16×103kg/m3

Fill in the blanks (this question contains 12 small questions)

40. Fill in the appropriate units for the following:

The mass of a pen is about 21.3 _ _ _ _ _ _ _ _;

The mass of an egg is about 50 _ _ _ _ _.

The quality of a classmate is about 4.5×104 _ _ _ _ _ _;

The quality of a pear is about 0.2 _ _ _ _

4 1.(04 Guiyang Experimental Area) As shown in the figure, the mass of apples on this electronic scale is _ _ _ _ _ g.

42. Weigh the total mass of a small glass of water and a spoonful of sugar, and then the mass of sugar water. Comparing the results of two times of weighing, we can draw the conclusion of _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

43.(00 Yantai) Some students put the object on the right plate by mistake when weighing it with a pallet scale. If the weight added to the left plate is 52 grams and the traveling code is moved to 0.4 grams, the balance is balanced. The actual mass of this object is _ _ _ _ _ _.

Xiao Ming measured the mass of a stone with a pallet balance. After the measurement, he found that due to carelessness, the stone was placed on the right plate and the weight was placed on the left plate, and the recorded data was 63.7g g g. He had a brainwave and revised the record according to the position of the walking code shown in the figure, so his record was _ _ _ _ _ _ _ _ _ _.

45. The "Arowana" brand blended oil sold in Shanxi (04) market is marked with the word "5L" on the bottle. It is known that the density of the blended oil in the bottle is 0.92× 103kg/m3, so the quality of the oil in the bottle is _ _ _ _ _ _.

46. As shown in the figure, the volume of boxed pure milk is _ _ _ _ _ m3. If the density of milk is 1.2× 103kg/m3, the quality of milk is _ _ _ _ _ kg. After drinking half, the density of milk will be _ _ _ _.

47. For ice and water with the same volume, the mass ratio is _ _ _ _ _ _ _ _ _ _

48.(02 Xuzhou) In order to search for antimatter or dark matter, China, the Russian Federation and the United States jointly developed and launched the "Alpha Magnetic Spectrometer" with the space shuttle in 1998. The core of "α magnetic spectrometer" is a permanent magnet developed in China, with a mass of 2t. The main material of this permanent magnet is iron, and its shape is a cylinder with a diameter of 120cm and a height of 80cm.

49. Two solid balls with the same material, the mass of ball A is 20g, and the mass of ball B is 0. 1kg, so the volume ratio of the two balls is VA: VB = _ _ _ _ _ _, and the density ratio ρ A: ρ B = _ _ _ _ _.

50. The densities of metal A and metal B are known as ρ 1 and ρ2, respectively. If metal A and metal B with equal mass are alloyed, the density of these two alloys is ().

When 5 1. 10 cm3 iron and 40cm3 aluminum form an alloy, the density of the alloy is _ _ _ _ _ _ _. (ρ iron =7.9× 103kg/m3, ρ aluminum =2.7× 103kg/m3).

Fourth, ask questions (this question contains 1 small questions)

52. There are often scenes in TV movies: when an earthquake or explosion happens, many tall buildings collapse and hit people. Please imagine what characteristics the prop materials for making this kind of high-rise building "concrete block" should have.

Five, information collection questions (this question contains three small questions)

53. In order to study the characteristics of matter, a classmate did an experiment with two different liquids, A and B. During the experiment, he measured the mass of liquid A (or B) with a measuring cylinder and a balance. The following table records the data measured in the experiment and the mass-volume ratio obtained.

(1) By analyzing the multiple relationship between the number of experiments 1 and the volume and mass changes of 2 or 3 and 4 in the above table, we can draw the following conclusions: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

(2) By analyzing the number of experiments in the above table _ _ _ _, it can be concluded that the volumes of liquid A and liquid B are the same, but the masses are different.

(3) By analyzing the proportional relationship between the mass and volume of the two liquids A and B in the above table, we can get _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

54. About 400 million people in China need to wear myopia or hyperopia glasses. Some technical indicators of the main materials that make up glass are as follows:

(1) If you had to choose, what kind of lens would you choose? Try to tell the result and reason of your choice.

(2) If the volume of each lens you choose is 4× 10-6m3, try to find the lens quality of this pair of glasses.

(3) If a pair of copper alloy frames are used, their mass is 2× 10-2kg, as shown in the figure. What is the quality of this pair of frames with titanium alloy instead of copper alloy?