Science 2 marks,3 marks and 5 marks Questions class-Xth

Science Questions

2 marks question

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1.Define the decomposition reaction and give an example of it.

2.What is the role of acid in our stomach?

3.i)Draw the electron dot structure of propane.
ii) Write the general formula for alkanes,alkenes,alkynes .

4.i)Give a test to distinguish butter and cooking oil.

ii)Define unsaturated hydrocarbons.

5.How does solenoid behave like a magnet ?Explain this with the help of a diagram.

6.In a certain species of animal black fur(B) is a dominant over brown fur(b).Predict a genotype and phenotype of the off spring when both parents are Bb or have heterozygous black fur.

7.Expain monohybrid cross he carried out.

8.Several electric bulbs designed to be used on a 220V electric supply line are rated at 10 W .How many lamps are connected in parallel with each other across two wires of 220V line,if the maximum allowable current is 5 A.

3 marks question

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1.Study the diagram given alongside and then answer the question that follows :-

i)Name the cells of the pancreas that produce and state their function.

a)Glucagon 

b)Insulin

ii)Why is the pancreas reffered to as an exo-endocrine gland?

iii)Why is insulin not given orally but is injected into the body?

2.A convergent lens of power 5D is combined with a divergent lens of power -4D .Then,find the focal length and power of combination of both lenses.

3.A concave mirror forms a real image of an object at a distance of 30cm from the mirror ,when it is kept at a distance of 50cm from the mirror .Then ,find the magnification of mirror.

4.Why and when does a current carrying conductor kept in a magnetic field experience force?List the factors on which direction of this force depends .

5.Differentiate between self-pollination and cross-pollination describe double fertilisation in plants.

6.Compound 'X' is obtained by passing gas 'Y' through dry slaked lime.On exposure to air ,it produces a strong smell of gas 'Y' and also forms calcium carbonate.Identify X and Y.

7.A compound has the formula H2Y(Y=Non metal).

State the following:-

i)The expected outer electronic configuration of Y.

ii)The valency of Y.

iii)The bonding present in H2Y.

8.i)Mention the process by which water enters into root hair cells.

ii)Explain plasmolysis .Give one application of this phenomenon in our daily life.

5 marks question.

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1.Number of vultures are decreasing remarkably now-a- days ,which is matter of concern.

Answer the following questions related to the above given statement.

i)Vultures belong to which category of animal?

ii)What is their role in nature to maintain ecological balance?

iii)At which trophic level will you place the vultures,in food chain?

iv)How much energy is passed on at each trophic level in a food chain?Give the energy flow diagram of ecosystem .

v)Mention one of the main cause for this decline in the number of vultures.

2.'Ozone at higher levels of the atmosphere is a product of UV radiation acting on the oxygen molecules .However ,same UB radiation is responsible for ozone layer depletion when CFCs act on it'.Comment.

3.i)On heating blue coloured powder of copper (II) nitrate in a boiling tube ,copper oxide (black),oxygen gas and a brown gas X is formed.

a)Write a balanced chemical equation of the reaction .

b)Identify the brown gas X evolved .

c) Identify the type of reaction.

d)What could be the pH range of the aqueous solution of the gas X?

ii)The carbonate of metal X is a white solid .It decomposes when heated to form carbon dioxide and a yellow solid oxide .What is metal X?

4.i)a)A narrow beam of white light is incident on three glass objects as shown below.Comment on the nature of behaviour of the emergent beam in all three cases.

b)There is a similarity between two of the emergent beam.Identify the two.

ii)Sun is visible 2 min before actual sunrise and 2 min after sunset .Give reasons.

5.i) State two positions in which a concave mirror produces a magnified image of a given object.List two difference between the nature of these two images.

ii)Differentiate between reflection and refraction of light.

iii)A ray of light is incident on an imaginary surface separating  diamond and water .Given that ,the refractive index for diamond and water with respect to air and 2.42 and 1.33 respectively.Draw the diagram by showing refracted ray and mark angles of incidence and refraction.

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By Anuranjan Gadekar

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