Science Sample Paper 7 for class Xth (latest)- Part A

 Science Sample Paper 

Section-A

1. I- V graph for the metallic wires X and Y at constant temperature are as shown in figure. Assuming that the two wires have same length and same diameter, then which of the two wires has higher resistance.

2. If two elements X and Y are present on the left and right side of the same group in the periodic table, then the atomic size of X would be more than that of Y. Examine the given statement and justify your answer.

Or

What were the criteria used by Mendeleev in creating his periodic table?

3. The focal length of a convex mirror is 20cm. Find the value of radius of curvature of the convex mirror.

4. Balance the following chemical equation.

NH3 + H2SO4 -----> (NH4)2SO4

5. What is the role of Villi present in the internal wall of intestine?

6. What type of oxide would Eka- aluminium form?

7. When the magnetic field lines are drawn around a current carrying circular loop, it has been observed that they are close to it's axis. But these lines keeps on diverging as we move away from the centre . Explain this observation.

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8. Which part of alimentary canal receives bile from the liver?

Or

In which part of alimentary canal digestion gets completed ?

9. Which one is not a base, HNO3 or NH4OH?

Or

The solution with the lowest concentration of H+ ions is pH = 7 or pH= 8.6

10. Draw a schematic diagram of an electric circuit consisting of  a battery of two cells each of 1.5 V, 5Ω, 10Ω and 15Ω resisitors and a plug key, all connected in series.

11. Which one is the most electronegative element among C, F, O and N?

12. Why SA node is known as the pacemaker of heart?

Or

Briefly explain the term gene or allele.

13. How is the strength of the magnetic field around a wire related to the strength of the electric current flowing in the wire?

Or

Two coils A and B are placed close to each other . If the current in the coil A is changed, will some current be induced in coil B ? Give reason.

Assertion-reason type questions

a) If both A and R are true and R is the correct explanation of A.

b) If both A and R are true but R is not the correct explanation of A.

c) A is true but R is false.

d) A is false but R is true.

14. Assertion :- When passing through a prism, the violet light deviates the most and the red light deviates the least.

Reason:- Red light has the maximum wavelength and violet light has the minimum wavelength.

15. Assertion:- Molecular movement are needed for life.

Reason :- In presence of water, bases give H+ ions.

16. Assertion :- HCl produces hydronium ions (H3O+) and chloride ions (Cl-) in aqueous solution.

Reason:- In presence of water, bases gives H+ ions.

Or

Assertion:- C4H10 and C6H12 are the successive members of homologous series of methane.

Reason:- Any two successive members in a homologous series differ in their molecular formula by - CH3 unit.

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Case Study

17. A candidate in order to study the process of osmosis has taken 3 potato and put them in 3 different beakers containing 3 different solutions. After 24 hours, in the first beaker the potato cube increased in size, in the second beaker the potato cube decreased in size and in the third beaker there was no change in the size of the potato cube. The following diagram shows the result of the same experiment.

i. The technical term used for beaker a is 

a) Hypotonic - hypotonic

b) Isotomic

c) Hypertonic- plasmolyses

d) Plasmolysis

ii. Four steps all cut from a fresh potato. The length of each step is measured. One strips is placed in water, the other in different concentration of sugar solution.

After an hour, the strips are measured again.

The results are shown in the table which liquid is water.

                                                a.   b.  c.  d.  

Original length of strip	75	78	82	86
Final length of strip	75	85	80	87

iii. The arrow show the movement of salt into a cell.

Which describe the movement of the cells?

a) Active transport against concentration gradient.

b) Active transport down concentration gradient.

c) Diffusion against the concentration gradient.

d) Diffusion down the concentration gradient.

iv. Which is an example of active transport?

a) Movement of glucose into the cells of the Villi.

b) Movement of glucose molecules down a concentration gradient.

c) Movement of ions in blood plasma.

d) Movement of water in the transpiration system.

v. Pieces of potato are placed in sucrose solution of different concentration. After three hours, the mass of each potato piece is measured. Which graph shows the result of their experiment?

a)

b) 

c)

d)

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Posted by :- Anuranjan Gadekar

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For Part - B click here...

https://theplatformoflearning.blogspot.com/2021/02/science-sample-paper-class-xth-latest_4.html