20 1 1 sixth grade science final examination paper

Basic knowledge 1. Fill in the blanks 1. Commonly used simple machines are levers, pulleys, pulleys and. 2. Improving the bending ability of the material can increase the thickness of the material and also change the material. 3. The basic shape of building frame structure is quadrilateral and. The lever is a simple machine. When working with a lever, the point of application on the lever is called the point of application, and the point of bearing heavy objects is called the support point. _ _ is arched in all directions, which makes it stronger than any shape. 6. Animals with thorns are called, and animals with thorns are called. 7. Fungi can't make nutrients, but live by absorbing other organisms or soil. 8. We can use other methods to enhance the ability of objects to resist bending. Second, multiple-choice questions 9. The energy possessed by a moving object is called (). A, mechanical energy b, chemical energy c, biological energy 10, only change the winding direction of the electromagnet coil, then the electromagnet (). A, the north and south poles change b, the north and south poles remain unchanged c, the magnetic field intensity changes 1 1, which of the following frames is not easy to deform (). A, b, c, d, 12, the cross section of the beam is generally (). A, flat B, vertical 13, which of the following situations is the most labor-saving (). A, b, c, 14, the lever with the force point close to the fulcrum and the resistance point far from the fulcrum is (). A, labor lever B, labor lever C, neither working nor working hard 15, for the same species, living in a hotter environment, its individual is (). The bigger a and b are, the smaller c is, which is also 16. When lifting heavy objects of the same quality, the most labor-saving part of the lower pulley is (). A B C 17, screws with the same thickness, the denser the thread, the harder it is to screw up (). A, effort B, effort C, neither effort nor effort 18, which of the following situations can be balanced (). A, B, C and III. True or false 19. Pteridophytes belong to green non-flowering plants. () 20. Changing the shape of a material cannot increase its bending resistance. () 2 1, the frame tower structure has the characteristics of large bottom, heavy bottom and small wind resistance. () 22. Compared with other shapes, the arch increases the thickness of the material. () 23. The bigger the wheel of the axle, the smaller the shaft, and the more labor-saving it is to drive the shaft with the wheel. () 24, dome-shaped turtle shell, mainly to make the turtle more beautiful. The energy possessed by coal, oil and natural gas ultimately comes from the sun. () 26. Electromagnets have no north and south poles. () 27. Both Setaria viridis and Impatiens are herbs. () 28. electromagnetic phenomena was first discovered by Danish scientist Oster. () IV. Connection Problem 29-30 Battery Solar Energy 3 1-32 Chemical Energy Screw for Tilting Steering Wheel Nuclear Power Plant Energy-saving Lever Wind Generator Atomic Energy Scientific Research on Mechanical Energy Tweezer Axle of Grabbed Claw Hammer Photocell 1. Graphic Question 1, (1-3) Draw the stress points, key points and fulcrums of the following tools and fill in the blanks. A, B, C, in the above picture, the labor-saving lever is (), and the labor-saving lever is (). 2.(4-6) Connect the pulleys below with wires and write down their functions. Function: function: function: 3. (7) Give you two hook codes. How to balance the lever ruler below? Please draw it in the picture below. Short answer 1, (8) Please write down several measures to protect biodiversity in your hometown according to the actual situation in your hometown. (at least 2) 2. (9) What are the methods to enhance the magnetic force of electromagnet? Three. Experimental problem 1, (10) When studying the relationship between the magnitude of electromagnet magnetic force and the current intensity in the coil, Xiao Ming changed the current intensity in the coil without changing the number of turns on the iron core, and obtained the following experimental data. Test results of factors influencing the number of experiments.

It's the first time to use a new dry battery 1 and suck 7 needles.

For the second time, two new dry batteries were connected in series 1 absorption 17 stitches.

Three new dry cells were connected in series for the third time, and/kloc-0 attracted 26 needles each time.

The changing factors in the experiment are: the constant factors are: the coil wound on the iron core. Through the analysis of the data recorded in the table, the experimental conclusions are as follows: 1 .( 1 1) The following figure is a comparative experiment to study the magnetic force of electromagnets. Experiments prove that. 3.( 12) There are four wooden boards with smooth surfaces, the lengths of which are 20CM, 40CM, 60CM and 80CM respectively. Xiaohong used them to put a block of wood with a height of 10cm to form four slopes A, B, C and D, and then pulled up 250g objects along the slope with a dynamometer to get the following data.

The applied force is (n)1.71.351.251.15.

Please analyze the data obtained from Xiaohong's research. What did you find?