Science Class X

Control & Coordination (C10)

Draw a neat diagram of human brain and label Medulla and Cerebellum. Write the functions of the above mentioned parts.

Control & Coordination (C10)

"Both overproduction and underproduction of Growth hormone leads to disorders in the body." Explain

Carbon & its Compounds (C10)

Write the structural formula of ethanol. What happens when it is heated with excess of conc. H2SO4 at 443 K? Write the chemical equation for the reaction stating the role of conc. H2SO4 in this reaction.

Carbon & its Compounds (C10)

Distinguish between esterification and saponification reactions with the help of the chemical equations for each. State one use of each (i) esters, and (ii) saponification process.

Carbon & its Compounds (C10)

Why are certain compounds called hydrocarbons? Write the general formula for homologous series of alkanes, alkenes and alkynes and also draw the structure of the first member of each series. Write the name of the reaction that converts alkenes into alkanes and also write a chemical equation to show the necessary conditions for the reaction to occur.

Carbon & its Compounds (C10)

You are given balls and stick model of six carbon atoms and fourteen hydrogen atoms and sufficient number of sticks. In how many ways one can join the models of six carbon atoms and fourteen hydrogen atoms to form different molecules of C6H14.

Science Practical (C10)

In a given ammeter, a student sees that needle indicates 17 divisions in ammeter while performing an experiment to verify Ohm’s law. If ammeter has 10 divisions between 0 and 0.5A, then what is the value corresponding to 17 divisions?

Science Practical (C10)

A student conducted an experiment to show CO2 is released during respiration. List two precautions that he or she must take for obtaining correct observations.

Science Practical (C10)

A student observed a permanent slide showing asexual reproduction in yeast. Draw diagrams of the observations he must have made from the slide. Name the process also.

Science Practical (C10)

Riya performs two set of experiments to study the length of the foam formed which are as follows:

Set I: she takes 10 ml of distilled water in test tube “A” and adds 5-6 drops of liquid soap in it and shakes the test tube vigorously.
Set II: she takes 10 ml of distilled water in a test tube “A” and adds 5-6 drops of liquid soap with half spoonful of CaSO4 in it and shakes the test tube.

Write your observation and reason.

Science Practical (C10)

What do you observe when you drop a few drops of acetic acid to a test tube containing:

a) Phenolphthalein c) distilled water
b) Universal indicator d) sodium hydrogen carbonate