Tag: elements and atoms

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Multiple choice evs look, learn and experience brief introduction to atoms of elements elements and atoms introduction of atom

Which of the following changes increases the overall density of the object?

  1. A block of iron is formed into a hollow shape

  2. A submarine fills its ballast tanks with water

  3. A submarine fills its ballast tanks with air

  4. A fish increases the amount of gas in its swim bladder
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When a low-density substance is replaced by high-density substance,the overall density increases.Here air which has low density compared to water is replaced.So,the overall density increases while in removing cases overall density decreases.


Option B is correct.

Multiple choice evs look, learn and experience brief introduction to atoms of elements elements and atoms introduction of atom

We have four substances P,Q,R,S. Substance P is dark coloured violet solid having diatomic molecules. Solution of P in alcohol is an Antiseptic 'T' Substance 'Q'is a white solid usually recovered from sea on a large scale. Substance 'R' is also a white solid insoluble in water and used in the form of small balls for safe storage of woolen clothes. Substance 'S' is a white solid too used in dry cell. P,Q,R,S,T, may be -(choose correct option)

  1. P-lodine, Q-Napthalene,R-$\displaystyle R-NH _{4}CI$ S-Nacl, T-lodine tincture
  2. P-NaCl,Q-Napthalene, $\displaystyle R-NH _{4}CI$

    S-lodine, T-lodine tincture
  3. P-lodine tincture, Q-$\displaystyle R-NH _{4}CI$ R- lodine, S-Napthalene, T-NaCl
  4. P-lodine, Q-Nacl, R- Napthalene,

    S-$\displaystyle R-NH _{4}CI$, T-lodine tincture
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

P = lodine $\displaystyle 1 _{2}$, dark coloured  violet solid Q = NaCl, recovered  from sea on large scale. R = Nephathalene, used in the from of small balls for safe storage of woolen clothes S = $\displaystyle NH _{4}Cl$, used in dry cells
T = TIncture iodine, a solution of iodine in alcohol as antiseptic 

Multiple choice evs look, learn and experience brief introduction to atoms of elements elements and atoms introduction of atom

Which of the following is a state of matter?

  1. Quark-gluon plasma

  2. Quantum spin liquid

  3. Superfluid

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There are more phases of matter which aren't as familiar nor do we see them every day. Some exist only in theory, others can be reproduced in laboratories, some are so new that scientists are still figuring out the details and others might exist, but have not yet been found in nature. They include: quark-gluon plasmas, Bose-Einstein condensates, fermionic condensates, strange matter, liquid crystals, quantum spin liquid (QSL), superfluids, supersolids and the paramagnetic and ferromagnetic phases of magnetic materials.

Multiple choice evs look, learn and experience brief introduction to atoms of elements elements and atoms introduction of atom

How many of the following is the matter?


Chair, Air, Heat, Smell, Sound, Almonds, Thought and Cold drink.

  1. $4$
  2. $5$
  3. $6$
  4. $7$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chair, Air, Cold drink, Almonds are matters as they have mass and occupy space. 


Remaining all does not have mass and does not occupy space. 

Thus they are not a matter.

Hence the correct option is A.

Multiple choice evs look, learn and experience brief introduction to atoms of elements elements and atoms introduction of atom

Which of the following statements is TRUE of matter?

  1. The states of matter are interconvertible

  2. Force of attraction varies from one kind of matter to another

  3. The states of matter can be changed by changing the temperature of pressure

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Matter is a substance which has mass and takes up space by volume the properties of matter are,

States of matter (solid,liquid,gas)are inter convertable.
Force of attraction varies from one kind of matter to another.
States of matter can be varied by varying temperature and pressure.

Multiple choice evs look, learn and experience brief introduction to atoms of elements elements and atoms introduction of atom

Choose one of the following definitions that give the correct meaning of matter :

  1. anything that occupies space and has mass is known as matter.

  2. anything that has definite shape and volume is known as matter.

  3. anything that has mass but not definite shape is known as matter.

  4. anything that is intangible is known as matter.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

There are many possible definitions of Matter. Matter is termed as any substance that has mass and occupy space.

Examples of matter- protons, atoms, molecules, compounds, pen, cap, ball, tree, cat, dog ,etc.
Examples that are not matter- light (photons), UV rays, heat, thought, infra-red waves, microwaves, emotions, etc.