Science Sample Paper 4 for class -Xth(MCQs)
Science Sample Paper
Time:-45 min. Mm:-32
Section-A
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1.Calcium phosphate is present in tooth enamel .What is it's nature?
Or
Why does bleaching powder give smell of chlorine ?
2.When a pencil is partly immersed in water and held obliquely to the surface ,the pencil appears to be bent at the water surface.Why?
3.Differentiate between stomata and lenticels.
4.What are two properties of carbon which lead to the huge number of carbon compounds ,we see around us?
5.Which spherical mirror can give a virtual image larger than the object?
Or
What is the phenomenon of reflection of light from an object in all directions called?
6.What happens when a planaria gets cut into two pieces?
Or
7.List two functions performed by the testis in human beings.
8.If a wire of resistance R is melted and recast to half of it's length ,what will be the new resistance of the wire?
Or
If three resistors 2Ω,3Ω and 5Ωare connected in parallel ,will the value of equivalent resistance be less than 2Ω or greater than 5Ω or lie between 2Ω and 5Ω?Explain.
Or
9.Name the cell organelle which take part in cellular respiration?
Or
What will be the average production of urine by adult human?
10.What type of bond is present in F2 molecule is formed ?
Or
What are oxidising agents ?
11.The radius of curvature of concave mirror is 12cm.Determine it's focal length .
12.The positions of five elements X,,Y,Z,R and S in the modern periodic table are shown below .Which pair of the elements have the same valency?
13.What is the pattern of field lines inside a solenoid ?What do they indicate?
Assertion-Reason Type Questions (Q.no.14-16)
In each of the following questions, a statement of assertion is given by the corresponding statement of reason.Of the statements, mark the correct answer as:-
a)If both Assertion and Reason are true is the correct explanation of assertion.
b)If both assertion and reason are true, what reason is not the correct explanation of assertion.
c)If Assertion is true,but Reason is false.
d)If assertion is false, but reason is true.
14.Assertion:-Different metals have different activities with water and dilute acids .
Reason:-Reactivity of a metal depends on its position in the reactivity series.
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15.Assertion:-The direction of magnetic field lines inside the magnet is a from South Pole to North Pole.
Reason--The direction of magnetic field produced by a straight current carrying wire depends upon the direction of current flowing through it.
16.Assertion:- Lungs contain a residual volume of air.
Reason:- It provide sufficient time for oxygen to be absorbed and for carbon dioxide to be released.
Case Study
17.Read the following and answer any four question from 17(i) to 17(ii)
A non metal A is an important constituent of our food and forms two oxides B and C.
Oxide B is toxic whereas C causes global warming.An element E combines with O2 to form an oxide E2O which is a good conductor of electricity.Answer any four following questions:-
17(i)Identify A.
a)Carbon
b)Carbondioxide.
c) Carbon monoxide
d)None of these .
17(ii)Which of the following statement is true about B?
a) The atomic mass of B is 28u
b)The chemical formula of B is CO
c)Both a and b.
d) none of the above
17(iii)Among the following statement which one are correct for C?
i) The molecular formula of C is CO2
ii)The atomic mass of C is 44u.
iii) it is used in fire extinguisher.
iv) it is an ionic compound.
a) i and ii
b)i,ii,iii.
c)iv
d)All of these.
17.(iv)The electronic configuration of A is
a)2,2
b)2,4
c)2,8,2
d)2,5
17(v)Among the following which structure cannot be E in any case.
A
B
C
D
18.Read the following and answer any four question from 18i to 18ii
A food web shows how energy passes from one organism to another in any given ecosystem.
18(i)Which one of the following food chain exit in a terrestrial ecosystemo.
a)Grass---lion----human
b)Grass---lion----human
c)Cow-----grass --- lion.
d)Leaf--bird--lizard.
18.ii The diagram shows a food web
Which levels represents carnivore?
a)P and R
b)P and Q
c)Q and R
d)R and S
18.iii. which of the following describes the flow of energy in an ecosystem?
a)heat energy ---- chemical energy--- light energy.
b)heat energy---light energy---- chemical energy.
c)light energy--- chemical energy--- heat energy.
d)light energy---heat energy----chemical energy.
18.iv.The diagram shows the flow of energy through an ecosystem.
The smallest amount of energy transferred between organisms and largest amount of energy lost to the ecosystem is represented by which arrows ?
Smallest energy. Largest energy loss
transfer
b)2. 1
c)2. 3
d)1. 4
18.v.The diagram shows how energy from food is used by wild beast. What percentage of this energy is available to consumers and decomposers.
a)100
b)66
c)96
d)4
19.Read the following and answer any four question 19.i to 19.v
Two doing experiment on finding the equivalent resistance of the resistors in series and parallel combination.
19.i.The students are using the circuits
shown below.They are doing the experiment to find the equivalent resistance of a
b)parallel combination and a series combination respectively of the two given resistors.
c) series combination of the two given resistors in both the cases.
d) parallel combination of the two given resistors in both the cases.
19.ii.the equivalent resistance of the circuit given below is:-
b)10Ω
c)4Ω
d)15Ω
19.iii.For carrying out the experiment, on finding the equivalent resistance of two resistors connected in series, student sets up the circuit as shown. On further verifications, he finds out that the circuit has one or more of the following faults.
I.The resistors R1 and R2 have not been correctly connected in series.
II. The voltmeter has not been correctly connected in the circuit.
III. The ammeter has not been corectly connected in the circuit .
a)Both I and II
b)both II and III.
c)only I
d)only II.
19.iv.Which of the circuit components in the adjoining circuit diagram are connected in parallel?
b)Only R1 and V
c)only R2 and V.
d)R1,R2 and V.
20.modern genetics is based on the gene and the fundamental unit is heredity.Mendel was the first to recognise the existence of gene . He concluded that their determinants of the particular nature known as geenes.In dihybrid crosses Mendel found 9:3:3:1 ration in F2 generation,which all really law 3:1 ratio combined at random.
29.i.At tall,pinked flower plant is self- fertilised and produces the offspring shown.
Red . Flower pink colour . White
tall 73 . 157. 67
Dwarf . 21 . 53. 25
When self -fertilised ,which type of plant will only produces identical offspring?
a)dwarf,pink- flowered
b)dwarf, white flowered
c)tall,red flowered
d)tall,white flowered
ii) In a species of plant, the allele for tall stands is dominant over that for short distance and the allele for purple flowers is dominant over that for white flowers.
A cross between two plants produced the following phenotypic ratio:-
tall-purpled.flower . 3
tall,white flowered. 3
short , purple flowered 1
short ,white flowered 1
What are the phenotypes of the parents?
a)short purple flower. Tall purple flower
b)Short white flowered. Tall purple flower
c)tall purple flowered tall white flower
d)tall white flowered short white flower
iii. What of these may be heterozygous.
a)ahaploid cell.
b)an allele of gene.
c)an organism with a dominant phenotype
d) an organism with the ressive genotype.
iv.Thers are two hupothesis to explain the production of white,pale pink or dark pink flowers in a species of plant
Hypothesis 1 .There are two codominant alleles .
Hypothesis 2 . There are three alleles ,one for each flower colour .
Which procedure is the best way of testing this hypothesis.
a)analysis of the flower pigments in several different flower by chromatography to find whether some plants contain more than one pigment.
b) controlled cross pollination of all the different colour varieties available, in all possible combinations, and recording the colours shown by the offspring.
c)controlled self pollination of several individuals of each of the colour varieties and recording the colours shown by the offspring of each individual plant sampled.
d)serving large wild population and finding the ratio of the different colours in this population.
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By Anuranjan Gadekar
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Great bro
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