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यूनिट 8 (अनुपात और समानुपात) यूनिट 9 (सममिति और प्रायोगिक ज्यामिति) उत्तरमाला. Science . 1.Food: Where Does It Come From? 2.Components of Food; 3.Fibre to Fabric; 4.Sorting Materials and Groups; 5.Separation of Substances; 6 ...
The cardboard is illuminated by light from a bulb. The position of eye with respect to position of bulb is shown in Fig.16.2 as A, a. b. d. 5. A small hole P is made in a piece of cardboard. The hole is illuminated by a torch as shown in Fig. 16.3. The pencil of light coming out of the hole falls on a mirror.
13 Sound. MULTIPLE CHOICE QUESTIONS. 1. A list of mediums is given below. (i) wood. (ii) water. (iii) air. (iv) vacuum. In which of these mediums can sound travel?
Suggest a suitable word for each of the following statements. (a) Chemicals added to food to prevent growth of microorganisms. (b) Nitrogen-fixing microorganism present in the root nodules of legumes. (c) Agent which spreads pathogens from one place to another.
28. Write True/False against the following statements and also correct the false statement. (a) A physical process in which a substance reacts with oxygen to give off heat is called combustion. (b) Water is the best extinguisher for fires involving electrical equipment.
8. Fill in the blanks (a) The object to be electroplated is taken as _____ electrode. (b) One of the most common applications of chemical effect of electric current is _____. (c) Small amount of a mineral salt present naturally in water makes it a_____ of electricity.
8. Given below are statements about the harmful effects of weeds on crop plants. (i) They interfere in harvesting. (ii) They help crop plants to grow healthily. (iii) They compete with crop plants for water, nutrients, space and light. (iv) They affect plant growth. Choose the correct combination of statements. (a) i, iii, iv (c) iii, iv
1. Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play. (a) only if the objects are solid. (b) only if one of the two objects is liquid. (c) only if one of the two objects is gaseous.
During dry weather, while combing hair, sometimes we experience hair flying apart. The force responsible for this is. (a) force of gravity. (b) electrostatic force. (c) force of friction. (d) magnetic force. 4. Fig.11.3 shows a container filled with water.
Earthquakes occur all the time all over the world. The plates of the outermost layer of the earth are always in continuous motion. Tremors on the earth can also be caused by the eruption of a volcano. The process of electric discharge cannot occur between clouds and the earth.
