Question

19. Ritesh was asked to determine the melting point of a given organic solld. For this, he weda
bath containing come. H2504. When he was looking at the thermometer, he lost his
concentration and became a little casual. The beaker containing boiling sulphuric acid fell
on his clothes. His clothes were burnt and he got severe burns on hands
1. Who did Ritesh meet with an accident?
2. Why did he get severe bums on the hands?
3. What lessons can a student leam from the above episode?
20. Seeta and Geeta are best friends and study in class X. Gecta is facing difficulty in reading
the black board text from the bench in the first row in a classroom. Seeta wonders why
Geeta avoids sitting in the first row. Sccta came to know that Geeta svolds milk and green
vegetables. She started sharing her lunch-full of green vegetables and fruits with Geeta.
Gecta is now better and has started taking a 'balanced diet'.
1. Name the cye defect Geeta is suffering from
2. What values are shown by Sccta and Geeta?
SECTION - B
21. How can it be shown that magnetic field exists around a wire through which direct current
is passing?
22. State the rule used to determine the direction of magnetic field produced around a straight
conductor carrying current
23. Draw the pattern of magnetic field lines of the field produced by a current carrying circular
loop
24. Why is red colour selected for danger signal lights?
25. Name the part of our eyes that helps us to focus ncar and distant objects in quick succession
26. What is dispersion of white light? What is the cause of such dispersion?
SECTION -C
27. Name the mostly widely used method of contraception. Explain how does it work?
28. Explain the working of lump as organs of excretion
29. Explain what are unisexual and bisexual organisms giving an example for each
30. The flow of current in a circular wire creates a magnetic field at its centre. How can existence of
this field be detected? Suate the rule which help to predia the direction of magnetic field.
31. Explain working and principle of DC motor with labeled diagram
32 To an aqueous solution of sodium hydroxide, a few drops of phenolphthalein were added what
do you observe? To this solution small amount of dil. HCI was added what do you observe
Dow? Explain your answer.
3. Desenbe the formation of rainbow in the sky with the help of suitable diagram
SECTION -R
34. Draw a diagram showing refraction of a ray of light through glass prism and mark the angle of
deviation
35. What is reproduction? Draw the labelled diagram of human Male reproductive system.
36. Name the acids and bases from which the following salts may be obtained.
1) Potassium sulphate
i) Calcium chloride
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Answer 1

Answer:

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