Grade 6 True or False

Here, b is 5, a is 2, and b is 5 more than a 2 = 250% so if a is 2/5 of b, then b is 50% more than a (

1) Of all natural numbers, except 1, they are either prime or composite. (3) The time is certain, and the time to produce each part is proportional to the number of parts produced. (4) In the attainment test, the number of students in a class who did not meet the standard was 1 24 of the number of students who met the standard, and the attainment rate of students in this class was 96%.

5) A triangle and an equal quadrilateral, they have the same area and equal height, then the base of the equal quadrilateral must be 1 2 of the bottom of the triangle. （

6) If A is 2 5 of B, B is 50% more than A (

7) If you look at a 10-degree angle with a 5x magnifying glass, then you will see a 50-degree angle. (8) The surface area of the cube with an edge length of 6 cm is equal to the volume. （

False Because b is 5, a is 2, and b is 5 more than a 2 = 250% So if a is 2/5 of b, then b is 50% more than a.

Problem 1: 1, False. Bar charts can clearly see how many quantities are there, while line charts can clearly see how many quantities are increasing or decreasing.

Question 2: Since each vertical axis represents a year, if the first line represents 2003, 2006 should be marked on the fourth line, 2008 should be marked on the sixth line, and so on, ......So the intervals are different.

Kneel and beg Chopin's famous song compressed package.

2011-2012 School Year 1st Semester 6th Grade Science.

Teaching quality monitoring questions.

Name: Student ID: Score:

1. Fill-in-the-blank questions (6 points for each question).

1.The bar is a simple machine, when the lever is used, the point of force on the bar is called, the point of bearing heavy objects is called, and the point of supporting is called. The lifting rope on the small rod scale is equivalent to . (Fill in "Fulcrum", "Power Point" or "Resistance Point").

2.The main purpose of bending the sheet material into the shape of "L", "T" or "I" is to.

3.A spherical shape is shaped in all directions, and this shape is more than any other shape.

4.A device consisting of a coil and an iron core is called , and it is generated when electricity is applied.

5.An animal with a spine in its body is called, and an animal without a spine in its body is called.

6.There are many mechanical principles applied to bicycles, such as handlebars.

2. True/False Questions (Correct Questions, Wrong Questions, 1 point, 5 points for each).

1.The dome shape can be seen as a combination of arches, which has the advantage of the arch bearing high pressure, and does not have the force of pushing outward when the arch is compressed.

2.The circuit is short-circuited, the current will not change greatly, and it does not matter if it is connected to the circuit for a long time.

3.When lighting with electric lights, the input energy is heat and the output is electricity.

4.Twins are hard to tell apart, and their physiognomy is exactly the same.

5.Natural selection can change the characteristics of living things, whereas artificial selection cannot change the characteristics of living things.

3. Multiple choice questions (fill in the serial number of the correct answer in parentheses, 1 point for each question, a total of 5 points).

1.The following levers are labor-saving ( ) and laborious ( ).

A vise bChopsticks cSeesaw.

2.In order to enhance the ability of the beam to resist bending, we usually put the beam ( ).

A, flat B, standing C, diagonal.

3.Among the following energy sources, they are non-renewable resources. （ a.Ocean Energy bCoal CBioenergy.

4.To change the direction of the north and south poles of the electromagnet, the correct thing to do is (

a.Change the number of cells in the circuit bChange the number of turns the coil wraps.

c.Change the length of the core dChange the direction in which the coil is wound.

5.Among the following animals belong to the class of insects: ( ) a, earthworm b, dragonfly c, spider.

Fourth, the connection question. (4 points for each question).

1 Connect the associated principles. 2 Connect the animals and categories with wires.

Car steering wheel, bevel, bee, mammal.

Winding road, labor-saving leverage, goats, insects.

Claw hammers, laborious levers, loaches, birds.

Tweezers, axles, swallows, fish.

Which subject's ??? Make it clear.

Suppose there are x people in class A and y people in class B, and it is good to get it according to the topic.

3x 5 = 3y 4 i.e. 12x = 15y

x-y=10, multiply both sides by 12 at the same time to get 12x-12y=120, so Kai socks 15y-12y=120, that is, 3y=120, solve y=40, x=50

There are a total of 90 students in Class A and Class B.

If A is X and Huai, then B is X-10 people.

So (3 5) x = (3 4) (x-10).

On both sides of the Chang shed erected Mahayana 20

12x=15x-150

15x-12x=150

3x=150

x=150÷3=50

x-10=40

A: 50 people in A, 40 people in B.

Set the number of people in class A to be X, and the number of people in class B is x-10.

3/5 x=(x-10)*3/4

x = 50 number of people in class B = 50-10 = 40

The total number of students in classes A and B = 50 + 40 = 90

I list a system of equations, I hope to understand. X is A, and Y is B.

5/3x=4/3y

Bumper family x-y=10

Follow both *35x=4y

3x-3y=30

Again * the same common multiple. (=12) to eliminate y

15x=12y

12x-12y=120

12x-120=12y

3x-120=0

3x=120

x=40A=40

B = 40-10

Answer: A is equal to 40 positive state, and B is closed to 30

3x/5 =3y/4

x=y+10

y=40,x=50

There are a total of 90 students in Class A and Class B.

1 pair because c= d is a constant.

2 pairs because folded is 1 2 two down 1 4 three down 1 83 pairs.

4 False 2010 No February 29 Because it is not a leap year 5 False The average height does not represent the height of the two of them.

1. The circumference of a circle is proportional to its diameter. (2. Fold the rectangular strip of paper in half, fold it in half, and fold it in half, and each of the latter is 1/8 of the note.)（

3. Adding "%" to the end is equivalent to shrinking to 1/100th of the original number(4. Xiao Ming calculated that February 29, 2010 was a Wednesday.) (5. The average height of Xiaoyun's class is meters, and the average height of Xiaoli's class is meters, so Xiaoli must be taller than Xiaoyun.)

1. C= ·d is a constant invariant.

2. Fold it yourself.

3. 4. 2010 is a normal year, not a leap year, so February has only 28 days, and it is impossible to have 29 days.

5. The average height does not represent the actual height.