Science - Model Test Paper Class: X Set – 2

Q 1)What do you mean by alkalis? Give example of an alkali. 1 Marks

Q 2)At old age the lens of people becomes milky and cloudy. Name the condition. What harm can be caused by this condition? 1 Marks

Q 3)How many periods and groups are there in the modern periodic table? 1 Marks

Q 7)Differentiate between alternating current and direct current. 2 Marks

Q 8)Draw the electron dot structure for ethane. 2 Marks

Q 9)Give reactions with water to show that magnesium is less reactive than sodium? 2 Marks

Q 10)You are given three resistors of equal resistance R. How will you combine them to have (i) maximum resistance (ii) minimum resistance? Also find the ratio of maximum resistance to minimum resistance. 2 Marks

Q 11)Give reasons for:
(i) Decomposition reactions are called endothermic reactions.
(ii) Antioxidants are added to foods containing fats and oil.
(iii) Sodium and potassium are kept in kerosene oil. 3 Marks

Q 13)An object 6 cm tall is placed at a distance of 24 cm in front of a convex lens of focal length 16 cm. Find the position, nature and size of the image. 3 Marks

Q 14)(a) What are the reasons for a large number of compounds of carbon?
(b) A compound X burns with a clean flame whereas a compound Y burns with a sooty flame. Which of the two is a saturated carbon compound? Which of the two will show an addition reaction? 3 Marks

Q 15)(a) State one limitation of each, Newland’s law of octaves and Mendeleev’s Periodic table.
(b) An element A with atomic number 12 forms SO₄^2- with the formula ASO₄. Identify the element and its place in the periodic table. What will be the formula of its chloride? 5 Marks

OR

Q. Atomic radii of the elements of the second period are given below:

(i) Arrange the above given elements in the pattern of a period in the Periodic Table.
(ii) How does the atomic size vary as we go from left to right in a period? Give reason for your answer.
(iii) What is the similarity between above elements?
(iv) How does the atomic size vary in a group? 5 Marks

Q 16)(a) What is meant by electromagnetic induction?
(b) How the direction of induced current can be found? Name a device that is based on the principle of electromagnetic induction.
(c) In what ways, current can be induced in a conductor?
(d) When will the induced current be maximum in a secondary coil? 5 Marks

OR

(a) Describe an activity to show that direction of magnetic field produced around a current carrying conductor depends on the direction of the current in the conductor.
(b) What will happen to the deflection of the needle if the compass is moved away from the current carrying wire while keeping current through it same? 5 Marks

Q 17)What is the condition required for the exploitation of ocean thermal energy? 1 Marks
Q 18)What will happen to the stomatal pore if:
(a) Guard cells swell?
(b) Guard cells shrink? 1 Marks

Q 19)What causes the movement of water in the xylem? 1 Marks

Q 20)Define ecosystem. Name the types of ecosystems with an example of each. 2 Marks

Q 21)“Fossil fuels need to be used judiciously”. Give two reasons to support the statement. 2 Marks

Q 22)Mention any two changes seen in the boys at the time of puberty. 2 Marks

Q 23)Name the part of the brain which:
(a) Maintains the body posture and balance during walking in a straight line, riding a bicycle etc.
(b) Controls the involuntary actions like vomiting, salivation etc. 2 Marks

Q 24)How many chambers of heart are present in (i) Fish (ii) Frog (iii) Lizard (iv) Man? 2 Marks

Q 25)Give an example of participation of people in the management of forests. 3 Marks

Q 26)The genotype of green coloured seeds is denoted as yy and that of yellow coloured seeds as YY. When these two are crossed,
(i) What colour of seeds would you expect in their F1 progeny?
(ii) Give the percentage of green coloured seeds if F1 plants are self pollinated.

(iii) In what ratio would you find the genotypes YY and Yy in the F2 progeny? 3 Marks

Q 27)(a) Draw a well-labelled diagram of the longitudinal section of the flower.
(b) Name the parts of the flower that perform the same function as the following parts in the animals: (i) Testis (ii) Ovary.
(c) Name a unisexual and a bisexual flower. 5 Marks

OR

(a) Draw a well-labelled diagram of the human heart showing its four chambers and main blood vessels associated with it.
(b) Why is the blood circulation in vertebrates called double blood circulation?
(c) Name the only artery in the human beings that carries deoxygenated blood. 5 Marks