Science Class X

Magnetic Effects (C10)

Name the electric device that converts mechanical energy into electrical energy. Draw the labelled diagram and explain the principle involved in this device.

Magnetic Effects (C10)

With the help of a labelled circuit diagram wire describe an activity to illustrate the pattern of the magnetic field lines around a straight current carrying long conducting wire.

  1. Name the rule that is used to find the direction of magnetic field associated with a current carrying conductor.
  2. Is there a similar magnetic field produced around a thin beam of moving (a) alpha particles and (b) neutrons? Justify your answer.

Magnetic Effects (C10)

(a) What are magnetic field lines? How is the direction of magnetic field at a point in a magnetic field determined using field lines?

(b) Two circular coils ‘X’ and ‘Y’ are placed close to each other. If the current in the coil ‘X’ is changed, will some current be induced in the coil ‘Y’? Give reason.

(c) State ‘Fleming’s right hand rule”.

Science Practical (C10)

Draw a labelled diagram of the experimental set up for the study of liberation of carbon dioxide gas during respiration.

Science Practical (C10)

In a school laboratory the students are studying the properties of ethanoic acid through certain experiments. How can they test its acidic nature ? Give two tests.

Science Practical (C10)

In the laboratory of a school, the sample of hard water is not available “to study the comparative cleaning capacity of a sample of soap in soft and hard water”. Which salt from the laboratory can be added to tap water to make it hard ? In the experiment how is cleaning capacity of soap compared ?

Management of Natural Resources (C10)

What is a dam? Why do we seek to build large dams? While building large dams, which three main problems should particularly be addressed to maintain peace among local people ? Mention them.

Our Environment (C10) Management of Natural Resources (C10)

Students in a school listened to the news read in the morning assembly that the mountain of garbage in Delhi, suddenly exploded and various vehicles got buried under it. Several people were also injured and there was traffic jam all around. In the brain storming session the teacher also discussed this issue and asked the students to find out a solution to the problem of garbage. Finally they arrived at two main points - one is self management of the garbage we produce and the second is to generate less garbage at individual level.

(a) Suggest two measures to manage the garbage we produce.

(b) As an individual, what can we do to generate the least garbage ? Give two points.

(c) List two values the teacher instilled in his students in this episode.

Reflection & Refraction (C10)

If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it? Draw a labelled ray diagram to support your answer.

Carbon & its Compounds (C10)

A compound ‘X’ on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound ‘Y’. ‘X’ also reacts with sodium metal to evolve a colourless gas ‘Z’. Identify ‘X’, ‘Y’ and ‘Z’. Write the equation of the chemical reaction of formation of ‘Y’ and also write the role of sulphuric acid in the reaction.

Control & Coordination (C10)

Write a and b in the given flow chart of neuron through which information travels as an electrical impulse.

Reflection & Refraction (C10)

What is meant by power of a lens? Write its SI unit. A student uses a lens of focal length 40 cm and another of –20 cm. Write the nature and power of each lens.

Reflection & Refraction (C10)

State the laws of refraction of light. Explain the term 'absolute refractive index of a medium' and write an expression to relate it with the speed of light in vacuum.

Control & Coordination (C10)

Name the hormones secreted by the following endocrine glands and specify one function of each:

(a) Thyroid (b) Pituitary (c) Pancreas

Reproduction (C10)

Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival - the one reproducing asexually or the one reproducing sexually? Give reason to justify your answer.

Electricity (C10)

Why are alloys commonly used in electrical heating devices? Give reason.

Electricity (C10)

Why are metals good conductors of electricity whereas glass is a bad conductor of electricity? Give reason.

Electricity (C10)

List the factors on which the resistance of a conductor in the shape of a wire depends.

Acids, Bases & Salts (C10)

2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube. When the contents are warmed, a gas evolves which is bubbled through a soap solution before testing. Write the equation of the chemical reaction involved and the test to detect the gas. Name the gas which will be evolved when the same metal reacts with dilute solution of a strong acid.

Chemical Reactions & Equations (C10)

Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity.

Life Processes (C10)

(a) Mention any two components of blood.

(b) Trace the movement of oxygenated blood in the body.

(c) Write the function of valves present in between atria and ventricles.

(d) Write one structural difference between the composition of artery and veins.

Life Processes (C10)

(a) Define excretion.

(b) Name the basic filtration unit present in the kidney.

(c) Draw excretory system in human beings and label the following organs of excretory system which perform following functions:
(i) form urine
(ii) is a long tube which collects urine from kidney
(iii) store urine until it is passed out

Reproduction (C10)

Write the function of following parts in human female reproductive system:

  1. Ovary
  2. Oviduct
  3. Uterus

Metals & Non-metals (C10)

How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.

Metals & Non-metals (C10)

Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.

Periodic Classification of Elements (C10)

(a) The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation of all the three attempts.

(b) Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.

(c) State Modern periodic law.

Human Eye & Colourful World (C10)

Write the function of each of the following parts of human eye:

  1. Cornea
  2. Iris
  3. Crystalline lens
  4. Ciliary muscles

Human Eye & Colourful World (C10)

A student is unable to see clearly the words written on the black board placed at a distance of approximately 3 m from him. Name the defect of vision the boy is suffering from. State the possible causes of this defect and explain the method of correcting it.

Magnetic Effects (C10)

Write the principle of working of an electric motor. Explain the function of the following parts of an electric motor:

  1. Armature
  2. Brushes
  3. Split ring

Science Practical (C10)

Name the process by which an amoeba reproduces. Draw the various stages of its reproduction in a proper sequence.

Science Practical (C10)

What is observed when a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube? Write equation for the chemical reaction involved and name the type of reaction in this case.

Science Practical (C10)

A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.

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.

Science Practical (C10)

An object of height 4.0 cm is placed at a distance of 30 cm from the optical centre ‘O’ of a convex lens of focal length 20 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre ‘O’ and principal focus ‘F’ on the diagram. Also find the approximate ratio of size of the image to the size of the object.

Science Practical (C10)

List the steps of preparation of temporary mount of a leaf peel to observe stomata?

Our Environment (C10)

The following organisms form a food chain.
Insect, Hawk, Grass, Snake, Frog

Which of these will have highest concentration of non-biodegradable chemicals? Name the phenomenon.

Sources of Energy (C10)

Why is there a need to harness non-conventional sources of energy? Give two main reasons.

Our Environment (C10)

"Human beings occupy the top level in any food chain." What are the consequences of this on our body?

Control & Coordination (C10)

Mention any one point of difference between Pepsin and Trypsin.

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.