ANSWERS TO BRAIN TEASERS Try to solve these Optical Illusions, Puzzles, and Brain teasers to increase your IQ level. It will help you to solve the Quizzes for any Competitive Exams. Prof. Masood Sadiq Answer: 1 Eight total holes in the vest. Answer: 2 Only 3 can reverse to clear traffic. Answer: 3 The word 'SPOT' is written twice in the pic Answer: 4 Look at the open holes toward F Answer: 5 Look at the upper of the pond. Answer: 6 Look at the left arm of the woman under the curtain. Answer: 7 Look at the back side of the elephant just over the bushes. Answer: 8 Look at the leaves just at the bottom of the picture. Click here to watch more Logical Reasoning based questions Answer: 9 Look at the shadow of a palm tree and shadowless camels. Answer: 10 Look at the picture closely. Answer: 11 Three matchsticks are just behind the lighter and five are in reflections, so there are Eight matchsticks in total. Click here to see a Unique River in the ...
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How do metals react? - Question in General Science
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Reactions of metals
There are some non-metals that can do one or two of the following things:
1. The jewellery is made of gold
2. Electricity cable is made of copper
3. Car body panels are made of steel.
4. Aluminum can be drawn out into thin wire without breaking.
Many crystals, for example, shine and reflect light, but they do not conduct electricity. graphite is a type of carbon which conducts electricity well, but it is brittle and breaks easily. many plastics can be drawn out into threads and can change shape without breaking, but they do not conduct electricity.
Only metals have high melting points and can reflect lights, conduct electricity, have their shape changed, and be drawn out into wire without breaking.
Since the Bronze age, about 4000 years ago, people have been extracting metals from the earth. they have melted these metals to make tools and weapons. they have used them either pure, as in iron, or mixed them to make alloys. a mixture of metals or a mixture of metal and any other element is known as an alloy.
Understanding the properties of metals:
why do metals behave as they do? the answer lies in the way the metal atoms are joined together.
Metals are Dense
Most metals are much denser than non-metals. The density of copper, for example, is about 9 g/cm^3 and that of gold is about 20 g/cm^3. This high density is due to the closely packed atoms. The diagram shows how regular layers of atoms make up a large structure.
Metals are Malleable and Ductile
Although metals are dense and strong, they can be easily shaped by hitting them with a hammer. Metals such as copper can also be pulled into long, thin wires. This happens because the pushing or pulling forces make the layers of atoms in the crystals slip over one another. the metal does not break, but it does change its shape.
Metals conduct electricity and heat
In metals, atoms are held close together, their outermost electrons are not tied to any atom and they are free to move. We can think of the electrons as forming a sea around the much larger, positive ions.
When an electric voltage is connected to the metal, an electric current flows because the electrons are free to move. Non-metals do not have a 'sea' of free electrons in their structure so they do not conduct electricity. they are insulators.
How do metals react?
With water
When metals are put into water, some react and some do not. Sodium and potassium react violently, giving off lots of hydrogen gas and forming alkalies. Magnesium reacts very slowly with cold water but reacts violently with steam. Unreactive metals such as gold, do not react with water or steam.
With acids
When metals are put into dilute acids, a similar thing happens. a few unreactive metals do not react with ais, just as they do not react with water. However, some metals, such as magnesium, which do not react with water, do react with acids, producing lots of hydrogen gas. Metals such as calcium, sodium,, and potassium react so violently that they should never be added to acid.
With air/oxygen
Many metals react so slowly with the oxygen in the air that it is not always easy to compare them. However, reactive metals, such as magnesium, burn easily in oxygen, producing oxides. Calcium, sodium, and potassium also react very quickly in the air but not as violently as in water. Metals such as gold and silver do not react and stay shiny in the air.
Choose the correct option -
Choose the correct option- Metals Reactions
1. Which of the following metals do not react in the air?
ANSWER= (B) gold and silver
Explanation: Gold and silver don't react in the air.
2. She get her brother ____ out her college daily.
D
ANSWER= (A) to drop
Explanation: She gets her brother to drop out her college daily.
3. She got her books ____ .
ANSWER= (B) bound
Explanation: She got her books bound.
5. He made all the children ____ an essay.
ANSWER= (C) write
Explanation: He made all the children write an essay.
6. All the children were made ____ in the class.
ANSWER= (B) to stand
Explanation: All the children were made to stand in the class.
7. Smoking will not help you ____ .
ANSWER= (B) relax
Explanation: Smoking will not help you relax.
8. They had their servant ____ tea.
ANSWER= (C) make
Explanation: They had their servants make tea.
9. Sara did not get any chance ____ herself.
ANSWER= (B) to avail
Explanation: Sara did not get any chance to avail herself.
ANSWER= (B)
Explanation: She did not let her friends waste her time.
19. They had got a new project ____ by the end of June.
ANSWER= (C) completed
Explanation: They had got a new project completed by the end of June.
20. Sara has ____ two friends in the class.
ANSWER= (D)
Explanation: Sara has got two friends in the class.
21. We have got our teacher ____ us.
ANSWER= (B)
Explanation: We have got our teacher to guide us.
22. I do not have my notes ____ .
ANSWER= (B)
Explanation: I do not have my notes typed.
23. You don't let my time ____ in gossip.
ANSWER= (D)
Explanation: You don't let my time waste in gossips.
24. I cannot let you ____ the house.
ANSWER= (A)
Explanation: I cannot let you leave the house.
25. We shall never make our plans ____ wasted.
ANSWER= (B)
Explanation: We shall never make our plans go wasted.
26. The teacher has made all the students ____ the rules.
ANSWER= (C)
Explanation: The teacher has made all the students obey the rules.
27. She has made a new project ____ .
C) rescheduling
ANSWER= (A)rescheduled
Explanation: She has made a new project rescheduled.
28. He had his house ____ purple.
ANSWER= (C) painted
Explanation: He had his house painted purple.
29. Did she get her friends ____ her fee?
ANSWER= (C) help
Explanation: Did she get her friends ____ her fee?
30. Our father made us ____ our homework first.
ANSWER= (C) finish
Explanation: Our father made us finish our homework first.
Student!
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