Tag: laboratory equipments

Questions Related to laboratory equipments

Cork stopper can be used as a plug in _____ in the chemistry laboratory.

common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

  1. flask

  2. test tube

  3. condenser

  4. both A and B

Show answer
Correct Option: A,B,C
Explanation:

Cork stopper is often used when a reaction is taking place in the flask or test tube and the by product or result of the reaction is desired to be collected. Its basic function is to plug. Also, it can be used in condenser. 

Which of the following are the correct precautions while bending a glass tube?

common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

  1. Select the tube of sufficient length to keep your hands safe from heat.

  2. While heating, the glass tube should be rotated in order to ensure uniform heating.

  3. Never bend the glass tubing by force. Doing so can break the tubing.

  4. All of these

Show answer
Correct Option: D
Explanation:

We have to take following precautions while cutting a glass tube:

  • Make a single deep scratch at the desired length with one stroke of file.
  • To avoid injury, hold the glass tube with the help of a thick piece of cloth or wear protective gloves.
  • Heat the end using a Bunsen Burner. Do not heat the end for long time. It may seal the end or make it narrow.
  • Select the tube of sufficient length to keep your hands safe from heat.
  • While heating, the glass tube should be rotated in order to ensure uniform heating.
  • Never bend the glass tubing by force. Doing so can break the tubing.

Corks are ideal stoppers because of:

common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

  1. its impermeability

  2. absence of toxic substances

  3. availability in a variety of standard sizes

  4. all of the above

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Correct Option: D

 Which type of splicing reaction requires a guanine nucleoside or nucleotide cofactor that is not used as a source of energy?

common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

  1. Group IV

  2. Group I

  3. Group II

  4. Spliceosomal

Show answer
Correct Option: B
Explanation:

Group I type of splicing reaction requires a guanine nucleoside or nucleotide cofactor that is not used as a source of energy. Self splicing group 1 intorns share number of different properties with enzymes which increases tthe reaction rate. The intorns excition the reactiion due to the internal guide sequence.

Which of the following are the correct precautions while cutting a glass tube?

common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

  1. Make a single deep scratch at the desired length with one stroke of file.

  2. To avoid injury, hold the glass tube with the help of a thick piece of cloth

  3. Do not heat the end for long time. It may seal the end or make it narrow.

  4. All of these

Show answer
Correct Option: D
Explanation:

We have to take following precautions while cutting a glass tube:

  • Make a single deep scratch at the desired length with one stroke of file.
  • To avoid injury, hold the glass tube with the help of a thick piece of cloth or wear protective gloves.
  • Heat the end using a Bunsen Burner. Do not heat the end for long time. It may seal the end or make it narrow.

What are the uses of glass/rubber tubes in the laboratory?

common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

  1. It helps cold water to flow in and out of the condenser to allow heated water vapourise

  2. For liquid and gases in the experiment, rubber stoppers are used as plugs in the flask

  3. Rubber tubing is always connected to a condenser, helps in distillation

  4. All of these

Show answer
Correct Option: D
Explanation:

Glass tubing is a long, clear tube used as a passage for liquid or gas in experiments. 
Rubber stoppers are used as plugs in flasks or test tubes. 
Rubber tubing is often connected to a condenser, which is a laboratory tool used in the process of distillation. The rubber tubing helps cool water to flow in and out of the condenser and helps the heated water vapor in the condenser return to its liquid state. 

What is the uses of cork in the laboratory?

common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

  1. It is used as a plug so that the volatile substances do not go out of the container

  2. It also serve as a stopper

  3. Very helpful in fractional distillation

  4. both A and B

Show answer
Correct Option: A,B,C
Explanation:

Corks are useful for stopping of volatile substances to go out, stopper, helps in fractional distillations.