Practical Based Questions

Chemistry practical based questions:

1. A student dropped a few pieces of marble in dilute hydrochloric acid contained in a test tube. The evolved gas was then passed through lime water. What change would be observed in lime water? Write a balanced chemical equation for both the change observed?
2. What is the use of KOH solution in the experiment to show that CO₂ is given out during respiration?
3. A student prepares aqueous solutions of the following salts:
   Copper sulfate, ferrous sulfate, sodium sulfate, and barium chloride.
   Write the color of each solution thus formed?
4. Write two precautions that must be taken while studying the decomposition reaction, when the ferrous sulfate crystals are heated in a boiling tube? 
5. A student is to conduct an experiment to show CO₂ is released during respiration. List two precautions that he/she must take for obtaining correct observation.
6. A student took solid quicklime in a china dish and added a small amount of water in it. State the type of sound produced in the reaction. Mention the type of reaction?  
7. Write any two precautions to study the reaction between Zn and HCl?
8. Dry ammonia gas has no action on litmus paper but a solution of ammonia in water turns litmus paper color. Why?
9. What is the color of zinc metal? What happens to its color when zinc reacts with hydrochloric acid?
10. What is observed when a solution of sodium sulfate is added to a solution of barium chloride taken in a test tube? Write an equation for the chemical reaction involved and name the type of reaction in this case. Mention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of the saponification reaction.
11. A student adds a spoon full of powdered sodium hydrogen carbonate to a flask containing ethanoic acid. List two main observations that he/she must note in his/her notebook about the reaction that takes place. Also, write a chemical equation for the reaction.
12. What happens when ethanol is heated with acidified potassium dichromate solution? Write the chemical equation.
13. 5% alkaline potassium permanganate solution is added drop by drop in a test tube containing warm ethanol. Write your observation and chemical equation of the reaction taking place.
14. What do you observe when you drop a few drops of acetic acid to a test tube containing:
    (a)  Phenolphthalein 
    (b)  Distilled water 
    (c)  Universal indicator 
    (d)  Sodium hydrogen carbonate.
15. A student added a few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulfate and copper Sulphate. In the second part of her experiment, she added iron metal to another test tube C and D containing aqueous solutions of aluminium sulfate and copper sulfate. In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why?
16. State the pH of distilled water and rainwater. Justify your answer with proper reasoning.
17. Write any two precautions while performing the pH experiment?
18. On opening the soda water bottle the dissolved CO₂ comes out, would the pH of the solution increase or decrease as the gas comes out? Give reason.
19. Hydrogen gas is neutral to litmus paper. Explain how?

 Physics Practical based Questions:

1. Suppose the ammeter or voltmeter you are using in the Ohm’s law experiment does not have +ve and –ve terminal markings. How will you use such an ammeter or voltmeter in the circuit?
2. Mention any four precautions while doing an experiment to verify Ohm’s law?
3. While performing an experiment to study the dependence of current on the potential difference across two ends of the resistor, a student keeps the circuit closed for a long time to measure the current and potential difference. State how the resistance of the resistor will be affected?
4.  In an experiment on studying the dependence of current flowing through a given resistor on the potential difference applied across it, list two ways how a student would change the values of current in the circuit?
5. A student focuses the image of a candle flame, placed at about 2 m from a convex lens of focal length 10 cm, on a screen. After that, he moves gradually the flame towards the lens and each time focuses its image on the screen. 
   (a) In which direction does he move the lens to focus the flame on the screen?
   (b) What happens to the size of the image of the flame formed on the screen?
   (c) What difference is seen in the intensity (brightness) of the image of the flame on the screen?
   (d) What is seen on the screen when the flame is very close (at about 5 cm) to the lens?
6. An incomplete ray diagram is shown below where the image A'B' for an object AB (placed somewhere in front of the lens) is formed after refraction through the convex lens.
   Observe the above and use the given information to fill in the following blanks:
   (i) The object AB would have been placed _________ .
   (ii) Size of the object would have been_________than the size of the image.
7. Draw a path of a light ray passing through a prism. Label angle of incidence and angle of deviation in the ray diagram.

Biology Practical based Questions:

1. Students were asked to observe the permanent slides showing different stages of budding in yeast under the high power of a microscope.
   (a)  Which adjustment screw (coarse/fine) were you asked to move to focus the slides?
   (b)  Draw three diagrams in a correct sequence showing budding in yeast.
2.  Mention about the four events that occur during binary fission in amoeba.
3. Write two precautions to be taken while identifying different parts of an embryo of a dicot seed.
4. List the steps of preparation of temporary mount of a leaf peel to observe stomata.
5. Name the process by which an amoeba reproduces. Draw the various stages of its reproduction in a proper sequence.
6. Mention any two characteristics of epidermal cells?
7. In an experiment to prepare the temporary mount of leaf peel, the staining of leaf peel is done before putting a drop of glycerin. Explain why?
8. State where the stomata are ideally located. Are they cellular structures?
9. Explain why the only a turgid leaf is selected for the preparation of a temporary mount of a leaf peel?
10. State any two functions of the cells surround the stomata?