PM SHRI KENDRIYA VIDYALAYA N.E.R BAREILLY
PERIODIC TEST – 2
SESSION – 2025-26
CLASS – 10th SUBJECT
– SCIENCE
TIME – 11/2HRS MM – 40
|
Q.No |
Section
A |
Marks |
|
1 |
Which of the following is a correct combination of function and
part of the brain? A. Posture and balance: Cerebrum B. Salivation: Medulla in midbrain C. Hunger: Pons in hindbrain D. Blood pressure: Medulla in hindbrain |
1 |
|
2 |
The
blood glucose level in a patient was very high. It may be due to inadequate
secretion of: A. growth hormone from pituitary gland B. oestrogen from ovary C.
insulin from pituitary gland D.
insulin from pancreas |
1 |
|
3 |
Which of the following substances when
dissolved in equal volume of water, will have the highest pH value? A. Sulphuric acid B. Acetic acid C. Magnesium hydroxide D.
Sodium hydroxide |
1 |
|
4 |
An electric iron of resistance 20 Ω draws a
current of 5 A. The heat developed in the iron in 30 seconds is:- a)15000J b)6000J c)1500J d)3000j |
1 |
|
5 |
The atomic no. of three elements X,Y& Z are 19 ,13 and
17 respectively.which of the following statement about these elements is
correct? A.X is a metal and it forms basic oxide. B.Y is a non metal and it forms acidic oxides C.Both Y and Z are non metals . D. X is a non metal while Z is a metal. |
1 |
|
6 |
There is a cerebellar dysfunction in a patient. Which of the
following activities will get disturbed in this patient as a result of this? A. Salivation. B. Hunger
control. C. Posture and balance D. Regulation of B.P. |
1 |
|
7 |
The oxide which can react with HCl as well KOH to give
corresponding salt and water is. A. CuO B.Al2O3 C.Na2O D.K2O. |
1 |
|
8 |
The following question consists of two statements – Assertion
(A) and Reason (R). Answer these questions by selecting the appropriate
option given below: A. Both A and R are true, and R is the correct
explanation of A. B. Both A and R are true, and R is not the correct
explanation of A. C. A is true but R is false. D. A is false but R is true Assertion-receptors are usually
located in our sense organs and perceive a particular stimulus. Reason- different sense
organs have different receptors for detecting stimuli. |
1 |
|
|
Section
B |
|
|
9 |
|
2 |
|
10 |
What are reflex actions. Draw a well labelled reflex arc. |
2 |
|
11 |
|
2 |
|
12 |
Show the formation of i) CaO ii)MgO |
2 |
|
|
Section C |
|
|
13 |
|
3 |
|
14 |
|
3 |
|
|
Section D |
|
|
15 |
Oxygen can combine with both metals and non-metals. It combines with
Calcium to form CaO and with carbon to form CO2. (a) What type of bond is formed between carbon and oxygen? (b) Identify the type of bond formed between Calcium and oxygen. (c)
Which of the above compounds will be a good conductor of electricity in
molten state and why? (d) Comment on the physical state (solid, liquid or gas) of CaO and
CO2. (e) What is the valency of
carbon in CO2? |
5 |
|
16 |
ii)Name and define the physical quantity
defined by the slope of V-I Curve given in the diagram. Use this graph to
find the value of this physical quantity in SI units. iii)Establish relationship between 1kWh and
1 joule. |
5 |
|
|
Section E |
|
|
17 |
Mohan and Rohit observed that shoots of a plant growing
in shade bend towards the sunlight. Whereas, leaves of ‘Touch me not’ plant
fold and droop soon after touching. They were curious to know how these
movements occur in plants |
4 |
|
18 |
The
extraction of metals from their ores and refining them for the use is known
as metallurgy. It Involves several steps such as concentration of ore into
oxide through calcination or roasting,
reduction of oxides using suitable reducing agents and refining of metals. i)Name an ore of mercury. ii)write a chemical equation for the
calcination of ZnCO3. iii) write the difference between roasting
and calcination. |
2+2 |
B. No, aluminium wire will not melt because metals have high melting points.
10.A reflex action is a quick, automatic, and involuntary response to a stimulus that occurs without conscious thought, often to protect the body from harm.
11.(i)𝑅= 𝑅1𝑅2 /𝑅1+𝑅2 = 8×8/8+8 =4 𝑜ℎ𝑚𝑠
(ii)𝐼= 𝑉/𝑅 =8/(4+4)=1 𝐴
12.
(i) No, ‘X’ is highly reactive and will catch fire.
(ii) Sodium.
It is extracted from molten sodium chloride by electrolytic reduction
Cathode: Na+ + e- ---- Na
Anode: 2Cl- Cl2 + 2e-
(Potassium is also a correct option)
OR
B.
(i) Copper gets oxidised/corroded to basic copper carbonate which is greenish in colour.
(ii) No, iron will rust and the reddish layer of rust will come off exposing iron to air, the dome will not be stable. Copper on the other hand on corrosion forms a protective layer which does not allow further corrosion.
(iii) Copper is a highly malleable metal, its thin sheets can be used to give different shapes of roofs, like the shape of a dome.
14.A.
(i) X = NaHCO3; Z = Na2CO3 (0.5+0.5)
(ii) Decomposition reaction (0.5)
(iii) Solution A (0.5)
(iv)Increasing order or H+ ions C<B<A (1)
OR
B.
(i) As bee sting is acidic and wasp sting is basic. (1)
(ii) To change the nature of soil to (neutral or basic). (1)
(iii) To protect sculptures from the effects of certain gases present in
environment and acid rain. (1)
15.(a) Covalent bond (b) Ionic bond (c) CaO, due to presence of free ions in molten state. (d) CaO is solid while CO2 is a gas. (e) 4
16.i) Ohm's Law is the law, which states that the electric current (I) flowing through a conductor is directly proportional to the voltage (V) applied across it and inversely proportional to the resistance (R) of the conductor. Mathematically, it can be represented as: (1)
V=IR
ii.The slope of the VI curve indicates the resistance (R) in ohms (Ω), as per Ohm's Law which states that V = IR.
From the graph, select two points. For example, the point (0,0) and (0.8, 6) gives ΔV = 6 - 0 = 6 V and ΔI = 0.8 - 0 = 0.8 A
Calculate the slope: R = 6 V / 0.8 A = 7.5 Ω.
iii.) 1kWh=3,600,000 j
17.
A. ● Bending of shoots of plants is a response to the stimulus and a directional, growth-related movement.
● When growing plants detect sunlight, a hormone called auxin, synthesized at shoot tip helps the cells to grow longer.
● When light is coming from one side of the plant, auxin diffuses to the shady side of the shoot.
● This concentration of auxin stimulates the cells of the shoot to grow 4 longer on the side of the shoot which is away from the light. Thus, plant appears to bend towards light. (0.5 x 4 =2)
OR
B. ● Leaves of ‘Touch me not’ plant respond to the stimulus by showing growth independent movement.
● These plants use electrical–chemical means to convey the information from cell to cell.
Movement happens at a point different from the point of touch.
● Plant cells change shape by changing the amount of water in them, resulting in swelling or shrinking, and therefore in changing shape. (0.5 x 4 =2)
C. Growth of pollen tubes towards the ovule is an example of chemotropism whereas bending of shoots towards sunlight is an example of phototropism. (1)
D. i) Although both plants and animals show electrical–chemical means to convey the information from cell to cell but unlike nerve cells in animals there is no specialized tissue in plants for conduction of information. (0.5)
ii) In animal cells, change in shape occurs because of the specialized proteins found in muscle cells; plant cells change shape by changing the amount of water in them. (0.5)
18.i cinnebar.
ii.Zinc carbonate is heated strongly in limited supply of air to convert it to oxide. This process is called calcination.
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