Board Paper of Class 10 2023 Science Delhi(Set 3) - 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 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 2
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 3
Acid present in tomato is:
(a) Methanoic acid
(b) Acetic acid
(c) Lactic acid
(d) Oxalic acid VIEW SOLUTION
- Question 4
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 5
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 6
- Question 7
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 8
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 9
Water in the root enters due to:
(a) the function of the root to absorb water.
(b) difference in the concentration of ions between the root and the soil.
(c) excess water present in the soil.
(d) diffusion of water in the roots.VIEW SOLUTION
- Question 10
Which one of the given statements is incorrect:
(a) DNA has the complete information for a particular characteristic.
(b) DNA is the molecule responsible for the inheritance of characters from parents to offsprings.
(c) Change in information will produce a different protein.
(d) Characteristics will remain the same even if protein changes.VIEW SOLUTION
- Question 11
Sensory nerve of a reflex arc carries information from the receptor cells to the:
(a) spinal cord
(b) brain
(c) muscles of the effector organ
(d) bones of the receptor organVIEW SOLUTION
- Question 12
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 13
The correct pattern of magnetic field lines of the field produced by current carrying circular loop is:
(a)
(b)
(c)
(d)
VIEW SOLUTION
- Question 14
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 15
An alpha particle enters a uniform magnetic field as shown. The direction of motion of the alpha particle is :
(a) towards right
(b) towards left
(c) into the page
(d) out of the page VIEW SOLUTION
- Question 16
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 17
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 18
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 19
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.
- Question 20
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
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