Board Paper of Class 10 2023 Science Delhi(Set 1) - Solutions
GENERAL INSTRUCTIONS:
Read the following instructions very carefully and follow them:
(i) This question paper consists of 39 questions. All questions are compulsory.
(ii) Question paper is divided into FIVE sections-Section A, B, C, D and E.
(iii) In section A - question number 1 1o 20 are multiple choice questions (MCOs) carrying 1 mark each.
(iv) In section B - question number 21 to 26 are very short answer (VSA) type questions carrying 2 marks each. Answer to these questions should be in the range of 30 to 50 words.
(v) In section C - question number 27 to 33 are short answer (SA) type questions carrying 3 marks each. Answer to these questions should in the range of 50 to 80 words.
(vi) In section D - question number 34 to 36 are long answer (LA) type questions carrying 5 marks each. Answer to these questions should be in the range of 80 to 120 words.
(vii) In section E - question number 37 to 39 are of 3 source based/case based units of assessment carrying 4 marks each with sub-parts.
(vii) There is no overall choice. However, an internal choice has been provided in some sections.
- Question 1
When Sodium bicarbonate reacts with dilute hydrochloric acid, the gas evolved is :
(a) Hydrogen; it gives pop sound with burning match stick.
(b) Hydrogen; it turns lime water milky.
(c) Carbon dioxide; it turns lime water milky.
(d) Carbon dioxide; it blows off a burning match stick with a pop sound. VIEW SOLUTION
- Question 2
When aqueous solutions of potassium iodide and lead nitrate are mixed, an insoluble substance separates out. The chemical equation for the reaction involved is:
(a) KI + PbNO3 → PbI + KNO3
(b) 2KI + Pb(NO3)2 → PbI2 + 2KNO3
(c) KI + Pb(NO3)2 → PbI + KNO3
(d) KI + PbNO3 → PbI2 + KNO3 VIEW SOLUTION
- Question 3
A metal ribbon 'X' burns in oxygen with a dazzling white flame forming a white ash 'Y'. The correct description of X, Y and the type of reaction is:
(a) X = Ca; Y = CaO; Type of reaction = Decomposition (b) X= Mg; Y = MgO; Type of reaction = Combination (c) X = Al; Y = Al2O3; Type of reaction = Thermal decomposition (d) X = Zn; Y = ZnO; Type of reaction = Endothermic
- Question 4
Acid present in tomato is:
(a) Methanoic acid
(b) Acetic acid
(c) Lactic acid
(d) Oxalic acid VIEW SOLUTION
- Question 5
Sodium hydroxide is termed an alkali while Ferric hydroxide is not because:
(a) Sodium hydroxide is a strong base, while Ferric hydroxide is a weak base.
(b) Sodium hydroxide is a base which is soluble in water while Ferric hydroxide is also a base but it is not soluble in water.
(c) Sodium hydroxide is a strong base while Ferric hydroxide is a strong acid.
(d) Sodium hydroxide and Ferric hydroxide both are strong base but the solubility of Sodium hydroxide in water is comparatively higher than
that of Ferric hydroxide. VIEW SOLUTION
- Question 6
The name of the salt used to remove permanent hardness of water is:
(a) Sodium hydrogen carbonate (NaHCO3)
(b) Sodium chloride (NaCl)
(c) Sodium carbonate decahydrate
(d) Calcium sulphate hemihydrate VIEW SOLUTION
- Question 7
- Question 8
Observe the following diagram and identify the process and its significance from the following options:
(a) Evaporation: maintains water contents in leaf cells.
(b) Transpiration: creates a suction force which pulls water inside the plant.
(c) Excretion: helps in excreting out waste water from the plant.
(d) Translocation: helps in transporting materials from one cell to another.VIEW SOLUTION
- Question 9
Opening and closing of stomata is due to:
(a) High pressure of gases inside the cells.
(b) Movement of water in and out of the guard cells.
(c) Stimulus of light in the guard cells.
(d) Diffusion of CO2 in and out of the guard cells.VIEW SOLUTION
- Question 10
A cross between pea plant with white flowers (vv) and pea plant with violet flowers (VV) resulted in F2 progeny in which ratio of violet (VV) and white (vv) flowers will be:
(a) 1 : 1
(b) 2 : 1
(c) 3 : 1
(d) 1 : 3VIEW SOLUTION
- Question 11
In plants the role of cytokinin is:
(a) Promote cell division.
(b) Wilting of leaves.
(c) Promote the opening of stomatal pore.
(d) Help in the growth of stem.VIEW SOLUTION
- Question 12
The number of chromosomes in parents and offsprings of a particular species undergoing sexual reproduction remain constant due to:
(a) doubling of chromosomes after zygote formation.
(b) halving of chromosomes after zygote formation.
(c) doubling of chromosomes before gamete formation.
(d) halving of chromosomes at the time of gamete formation.VIEW SOLUTION
- Question 13
Two LED bulbs of 12 W and 6 W are connected in series. If the current through 12 W bulb is 0.06 A the current through 6 W bulb will be:
(a) 0.04 A
(b) 0.06 A
(c) 0.08 A
(d) 0.12 A VIEW SOLUTION
- Question 14
The correct pattern of magnetic field lines of the field produced by current carrying circular loop is:
(a)
(b)
(c)
(d)
VIEW SOLUTION
- Question 15
The resistance of a resistor is reduced to half of its initial value. If other parameters of the electrical circuit remain unaltered, the amount of heat produced in the resistor will become:
(a) four times
(b) two times
(c) half
(d) one fourth VIEW SOLUTION
- Question 16
An alpha particle enters a uniform magnetic field as shown. The direction of force experienced by the alpha particle is:
(a) towards right
(b) towards left
(c) into the page
(d) out of the page VIEW SOLUTION
- Question 17
Assertion (A): Reaction of Quicklime with water is an exothermic reaction.
Reason (R): Quicklime reacts vigorously with water releasing a large amount of heat.
(a) Both (A) and (R) are true and (R) is the correct explanation of (A).
(b) 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. VIEW SOLUTION
- Question 18
Assertion (A): In humans, if gene (B) is responsible for black eyes and gene (b) is responsible for brown eyes, then the colour of eyes of the progeny having gene combination Bb, bb or BB will be black only.
Reason (R): The black colour of the eyes is a dominant trait.(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.VIEW SOLUTION
- Question 19
Assertion (A): The inner walls of the small intestine have finger like projections called villi which are rich in blood.
Reason (R): These villi hàve a large surface area to help the small intestine in completing the digestion of food.(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.VIEW SOLUTION
- Question 20
Assertion (A): A current carrying straight conductor experiences a force when placed perpendicular to the direction of magnetic field.
Reason (R): The net charge on a current carrying conductor is always zero.(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.
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Board Paper of Class 10 2018 Science Delhi(SET 1) - Solutions
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Board Paper of Class 10 2017 Science Delhi(SET 3) - Solutions
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Board Paper of Class 10 2017 Science All India(SET 1) - Solutions
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Board Paper of Class 10 2017 Science All India(SET 2) - Solutions
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Board Paper of Class 10 2017 Science All India(SET 3) - Solutions
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Board Paper of Class 10 2017 Science Abroad(SET 3) - Solutions
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Board Paper of Class 10 2016 Science Delhi(SET 1) - Solutions
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Board Paper of Class 10 2016 Science Delhi(SET 2) - Solutions
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Board Paper of Class 10 2016 Science Delhi(SET 3) - Solutions
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Board Paper of Class 10 2016 Science All India(SET 3) - Solutions
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Board Paper of Class 10 2015 Science Delhi(SET 1) - Solutions
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Board Paper of Class 10 2012 Science All India(SET 3) - Solutions
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Board Paper of Class 10 2015 Science Delhi(SET 2) - Solutions
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Board Paper of Class 10 2015 Science Delhi(SET 3) - Solutions
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Board Paper of Class 10 2015 Science All India(SET 1) - Solutions
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Board Paper of Class 10 2015 Science All India(SET 2) - Solutions
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Board Paper of Class 10 2015 Science All India(SET 3) - Solutions
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Board Paper of Class 10 2015 Science Abroad(SET 3) - Solutions
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Board Paper of Class 10 2014 Science Delhi(SET 1) - Solutions
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Board Paper of Class 10 2014 Science Delhi(SET 2) - Solutions
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Board Paper of Class 10 2014 Science All India(SET 1) - Solutions
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Board Paper of Class 10 2014 Science All India(SET 2) - Solutions
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Board Paper of Class 10 2013 Science Delhi(SET 1) - Solutions
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Board Paper of Class 10 2013 Science Delhi(SET 2) - Solutions
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Board Paper of Class 10 2013 Science Delhi(SET 3) - Solutions
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Board Paper of Class 10 2011 Science Delhi(SET 3) - Solutions
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Board Paper of Class 10 2010 Science Delhi(SET 3) - Solutions
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Board Paper of Class 10 2009 Science Delhi(SET 1) - Solutions
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Board Paper of Class 10 2009 Science Delhi(SET 2) - Solutions
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Board Paper of Class 10 2009 Science Delhi(SET 3) - Solutions
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Board Paper of Class 10 2009 Science All India(SET 1) - Solutions
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Board Paper of Class 10 2009 Science All India(SET 2) - Solutions
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Board Paper of Class 10 2009 Science All India(SET 3) - Solutions
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Board Paper of Class 10 2009 Science Delhi(SET 3) - Solutions
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Board Paper of Class 10 2009 Science Abroad(SET 3) - Solutions
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Board Paper of Class 10 2008 Science Delhi(SET 1) - Solutions
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Board Paper of Class 10 2007 Science Delhi(SET 1) - Solutions
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Board Paper of Class 10 2007 Science All India(SET 1) - Solutions
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Board Paper of Class 10 2007 Science Abroad(SET 1) - Solutions
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Board Paper of Class 10 2006 Science Delhi(SET 1) - Solutions
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Board Paper of Class 10 2006 Science All India(SET 1) - Solutions
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Board Paper of Class 10 2005 Science Delhi(SET 1) - Solutions
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Board Paper of Class 10 2005 Science All India(SET 1) - Solutions
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Board Paper of Class 10 2005 Science Abroad(SET 1) - Solutions