Science Sample Paper 7 for class - Xth (latest)- Part B
Science Sample Paper (Part-B)
Section- A
18. Resistance of a conductor depends on the length, area of cross section and nature of the material of the conductor. When a conductor is stretched (increased in it's length), then its area of cross section decreases accordingly but the volume (i.e., area × length)of the conductor remains the same.
i. V- I graphs for two wires A and B are shown in the figure. If both wires are of same length and same thickness, then
a) the resistivity of wire A is greater than that of wire B.
b) the resistivity of wire B is greater than that of wire A.
c) the resistivity of both the wires are equal.
d) this graph does not depict and information regarding the resistivity of two wires.
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ii. The length (l) of a wire of resistance (R) is half and area of cross section (A) is doubled, its new resistance R' will be
a) R/4
b) R
c) R/2
d) R/8
iii. The figures below show 4 cylindrical copper conductor's along with their face areas and lengths. The geometrical shape in which the resistance will be the highest is:-
a
b
c
d
a) 1 : 2
b) 1 : 4
c) 2 : 1
d) 1 : 1
v. In practical applications, resistors are used to
a) increase or decrease the current
b) increase the current
c) decrease the current
d) None of the above.
19.
Mendel's experiment on sweet pea plant having axial flower with round seeds (AARR)
and terminal flowers with wrinkled seeds (aarr).
i. Phenotype of F1 progeny
a) axial round seeds.
b) terminal wrinkled
c) axial wrinkled seeds.
d) terminal round
ii. Phenotype of F2 progeny produced upon by self- pollination of F1 progeny
a) axial round and wrinkled
b) terminal round
c) terminal wrinkled
d) All of these.
XY. XX
22. State the difference between sperm and ovum.
Which sex are of the off spring in boxes 1, 2, 3 and 4?
1. 2. 3. 4.
a) Boy. Girl. Boy. Girl
b) Boy. Girl. Girl. Boy
c) Girl Boy. Girl. Boy
d) Girl. Girl. Boy. Boy
iv. In rabbit the allele for black hair is dominant. A heterozygous black- haired rabbit is crossed with a heterozygous black- haired rabbit?
a) 1 : 1
b) 1 : 2 : 2
c) 3 : 1
d) All similar
v. Which statement is true of a dominant allele?
a) It cannot undergo mutation
b) It give greater chance of survival than recessive allele.
c) It give the same phenotype in heterozygote and homozygote.
d) It is only responsible for male characters.
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20.
A student was given Mg, Zn, Fe and Cu metals . He puts each of them and delete HCl contained in different test tubes.
i. Which is the correct order of reactivity?
a) Mg< Zn< Fe< Cu
b) Mg> Zn> Fe> Cu
c) Mg< Fe< Zn< Cu
d) Mg> Fe> Zn> Cu
ii. Which will given H2 with it's 5% ?
a) Mg
b) Zn
c) Cu
d) Fe
iii. Choose the correct statement.
a) Cu metal will be displaced by all metals.
b) Cu metal will displace the all other metals.
c) Mg metal will displaced by all other metals.
d) None of these.
iv. Which of these reaction (s) is/are correct.
a) Cu + H2SO4 ---------> CuSO4 + H2
b) Fe + H2SO4 -----------> FeSO4 +H2
c) Zn + H2SO4 ------------> ZnSO4 + H2
d) All of the above.
v. Choose the correct option match.
Metal Used in
A. Fluorine. i. Making utensils
B. Copper. ii. Making ornaments
C. Silver. iii. Tooth Paste
Codes
a) A- i, B-ii, C- iii
b) A-ii, B-i, C-iii
c) A- iii, B-i, C-ii
d A- ii, B- iii, C- I
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Section - B
21.i. How much work is done in moving a charge of 3C across two points having a potential difference of 15V?
ii. Find the equivalent resistance between A and B.
23. While diluting an acid, why is it advised that the acid should be added to water and not water to the acid?
Or
The gas X reacts with lime water to give a compound Y , which is used as bleaching agent in chemical industry.
Identify X and Y by giving the chemical equation of the reaction involved.
24. An object of height 4 cm is placed perpendicular to the principal axis of a concave lens of focal length 10cm. If object is kept at a distance 20cm from optical centre, then find the size of image .
Or
An object of height 5 cm is placed on the principal axis of concave mirror of focal length 20cm. If the virtual image is formed by the concave mirror at a distance of 10 cm from its pole, then find the size of image.
25. Give the electron draught structure of a molecules of sulphur, which is made up of eight atoms of sulphur.
26. Explain the process by which the autotrophic organisms fulfill their carbon and energy requirements?
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Posted by - Anuranjan Gadekar
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