#### 10th Public Exam March 2019

10th Standard

Reg.No. :
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Science

Time : 02:30:00 Hrs
Total Marks : 75
9 x 1 = 9
1. Which of the follwing is inheritable?

(a)

An altered gene in sperm

(b)

An altered gene in liver cells

(c)

An altered gene in skin cells

(d)

An altered gene in udder cells

2. ________worked out the first scientific experiment study on heredity.

(a)

lan Wilmut

(b)

Gregor Johan Mendel

(c)

Charles Drawin

(d)

Lamarck

3. The first vaccine produced by bio-technology was used against ____________ virus.

(a)

Hepatitis B

(b)

Hepatitis C

(c)

Hepatitis A

(d)

Hepatitis C

4. Spinal nerves are _________________.

(a)

sensory nerves

(b)

motor nerves

(c)

mixed nerves

(d)

innervating the brain

5. Post-fertilization, the ovule changes into a/an __________ .

(a)

seed

(b)

fruit

(c)

endosperm

(d)

pericarp.

6. Carnivorous animals use these teeth to tear flesh.

(a)

incisors

(b)

canines

(c)

premolars

(d)

molars

7. .......................... of green plants are called factories of food production.

(a)

Mitochondria

(b)

Chloroplasts

(c)

Endoplasmic reticulum

(d)

Nucleus

8. When aqueous solution of silver nirate and sodium chloride are mixed,___________precipitate is immediately formed

(a)

White

(b)

Yellow

(c)

Red

9. One light year is equal to _________ .

(a)

${ 365.25\times 24\times 60\times 60\times 3\times 10 }^{ 8 }m$

(b)

${ 1\times 24\times 60\times 60\times 3\times 10 }^{ 8 }m$

(c)

${ 360\times 24\times 60\times 60\times 3\times 10 }^{ 8 }m$

10. 6 x 1 = 6
11. -----------is used to cure Pernicious anaemia.
(vitamin C, Vitamin B,vitamin B12)

()

vitamin B12

12. Solute + Solvent -Solution
Dispersed phase + Dispersion medium

()

Colloidal solution

13. Assertion: Chemical bonds in organic compounds are covalent in nature.
Reason: Covalent bond is formed by the sharing of electrons in the bonding atoms.
Does the reason satisfy the given assertion?

()

Yes, the reason satisfies the given assertion.

14. List out the names of the organisations which are not associated with Chandrayaan-I mission from the following:ISOR, BARC, NASA, ESA, WHO, ONGC

(a)

UnAvailable Option

15. The value of G is_____

()

6.673 $\times$10-11 Nm2 kg-2

16. How can an AC generator be converted into a DC generator?

()

Slip rings are replaced by a split ring type commutator.

17. 10 x 2 = 20
18. What is corpora quadrigemina? Name the functions associated with it.

19. Mention any four adaptations seen in the camel so that it can live successfully in deserts.

20. Observe the diagram

i)Mention the type of movements shown in figure A and B.

ii)How does this movement differ from the movement of mimosa?

21. What are saprophytes? Give two examples.

22. Study the food chain below, correct it and convert it into a pyramid of energy.
Mulberry $\longrightarrow$ Sparrow $\longrightarrow$ Caterpillar $\longrightarrow$ Kite

23. A non-renewable resource is a natural resource, if it is replaced by natural process at a rate equal to or faster than its rate of consumption by humans.
Read this statement and say whether it is correct or incorrect. If it is incorrect, give the correct statement.

24. Hydrogen is found to be a good choice among the alternative fuel, why?
1.Hydrogen can meet all the energy needs of human society, including power generation more efficiently and more economically than petrol fuels and in total compatibility with the environment.
2.Hydrogen is non - toxic, reasonably safe to handle, distribute and to be used as a fuel.

25. Identify and correct the mistake in each of the following:
a. The molar volume of gas at STP is 22.4 Cm3.
b. 2 x R.M.M. = V.D
c. An atom cannot exist independently.
d. The ratio of atoms in a molecule may be integral or simple or may not be fixed.
e. H20 is a homo atomic molecule.

26. The hydroxide ion concentration of a solution is $1.0X10^{ -8 }m$What is the pH of the solution?

27. To design the body of an aircraft, aluminium alloys are used. Give reasons.

28. 1 x 5 = 5
29. Draw the L.S of kidney and label the parts.