CBSE 10th Term 1 Science Answer Key 2021 Download 1st December Question Paper Solution

CBSE 10th Term 1 Science Paper Solution 2021 Set Wise: Hello Students, the Central Board has begun the 10th Class Term 1 Exams. The 10th Term 1 Social Science is paper is already conducted and its Answer Key discussed. Now its time to find out about the CBSE 10th Term 1 Science Answer Key 2021. Soon after the finishing the 10th Class Science Paper students come here match their Answers with CBSE 10th Term 1 Science Paper 2021 we are gonna provide here.

The CBSE 10th Class Term 1 Science Exam Paper is finished now. The CBSE 10th Term 1 Science Paper Solution is also updated here. Students can check all 60 questions answer sheet from the below. According to news are coming from students the Science Paper was above average or we can say at good level paper. Students will find the details CBSE 10th Term 1 Science Answer Key from below.

Latest News: Today is CBSE Board 10th Term 1 Science Paper will take place from 11:30 AM to 1:00 PM. The CBSE 10th Science Paper Solution is available now.

CBSE 10th Term 1 Science Answer Key 2021

The CBSE Board has started the 10th Class Term 1 Exam with Social Science Paper which has been conducted on 29th November. Board is conducting the 10th Term 1 Exam as OMR based Exam. So after finishing the exam students will rush to look for the CBSE 10th Term 1 Science Answer Key 2021 online. There are around 60 Questions in CBSE 10th Science Paper which then further divided into four parts as Section A, B, C and Section D. Here we are discussing details about CBSE 10th Term 1 Science Answer Key 2021. We will start updating the CBSE 10th Term 1 Science Paper Solution soon after the exam completion. Students can hoop on this website to check CBSE 10th December 1 Exam Answer Key. CBSE 10th Term 1 Science Answer Key for Section Wise is discussed in this below.

CBSE 10th Term 1 Science Answer Key 2021

CBSE 10th Science Question Paper Solution 2021

Right after finishing the CBSE 10th Term 1 Science Exam, Students are looking for the Paper Solution, to find how their paper went. Students do not worry about that, we got you covered there the CBSE 10th Science Question Paper Solution will start soon after the exam completion. By the time participate will read home they will have CBSE 10th Term 1 Science Answer Key to match their answers. Off-course there are different set of paper, if we only put out the option it will create confusion between students, which one is right and which one is wrong. So, we are also going to update the CBSE 10th Term 1 Science Questions as well as their Answers in writing. So the students can check their CBSE 10th Term 1 Science Answer Key in peace.

CBSE 10th Science Paper 2021 Section A Answer Key

The 10th Term 1 Science Paper will divided into four sections, here students can find the CBSE 10th Term 1 Science Section A Answer Key. In Section A of Science Paper there will be 24 Questions. Here students are gonna find the CBSE 10th Term 1 Science Section A Answer Key for first 24 Questions.

SET Number 4 Paper Solution

Section A

Que 1: A students took sodium Sulphate solution in a test tube and added Barium Chloride to it. He Observed that a insoluble substance has formed The Colour and molecular formula of the insoluble substance is:

Ans: White BaSO4

Que 2: Which of the following oxide(s) is/are soluble in water to form alkalies?

Ans: Na2O and K2O

Que 3: Study the diagram given below and identify the gas formed in the reaction.

Ans: Hydrogen which while burning produces a popping sound.

Que 4: Sodium reacts with water to form sodium hydroxide and hydrogen gas. The balanced equation which represents the above.

Ans: 1Na(s) + 1H2O(l)- 1NaOH(aq) + H2(g)

Que 5: Which of the options in the given table are correct?

Ans: Sour Milk- Lactic Acid and Ant Sting- Methanoic Acid

Que 6: C6H12O6(aq) + 6O2(aq)- 6CO2(aq) + 6 H2O(l)

The above reaction is a/an

Ans: Exothermic Reaction

Que 7: Which of the following statements about the reaction given below are correct?

MnO2+ 4HCl- MnCl2+2H2O+ Cl2

Ans: HCl is oxidized to Cl2 and MnO2 is reduced to MnCl2

Que 8: Select from the following the statement which is true for bases.

Ans: Bases turn pink when a drop of phenolphthalein is added to them.

Que 9: Study the following table and choose the correct option.

Ans: Sodium Chloride- HCl-NaoH-Basic

Que 10: It is important to balance the chemical equation to satisfy the law of conservative of mass. Which of the following statements of the law is incorrect?

Ans: The chemical composition of the reactions is the same before and after the reaction.

Que 11: Consider the following statements in connection with the Function of the blood vessels marked A and B in the diagram of a human heart as shown.

Ans: Blood Vessel A- It carried carbon dioxide rich blood to the lungs and

Blood Vessel B- It carried oxygen rich blood from the lungs.

Blood Vessel B- Left atrium relaxes as it receive blood from this blood vessel.

Que 12: In living organisms during respiration which of the following products are not formed if Oxygen is not available?

Ans: Carbon Dioxide + Water

Que 13: The correct statements with reference to single celled organisms are:

Ans: Complex substances are now broken down into simpler substances and Entire surface of the organism is in contact with the environment for taking in food.

Que 14: Which one among the following is not removed as a waste product from the body of a plant?

Ans: Uria

Que 15: Which of the following statements are correct in reference to the role of A during a breathing cycle in human beings?

Ans: It flattens as we inhale and It helps the chest cavity to become larger.

Que 16: Which one of the following conditions is true for the state of stomach of a given leaf shown in the given diagram?

Ans: Large amount of water flows into the guard cells.

Que 17: In which of the following is a concave mirror used?

Ans: A Solar Cooker

Que 18: A student wants to obtain magnified image of an object AB as on a screen which on the following arrangements shows the correct position of AB for him/her to be successful.


Que 19: The following diagram shows the use of an optical device to perform an experiment of light. As per the arrangement shown the optical device is likely to be a:

Ans: Concave Mirror

Que 20: A ray of light starting from air passes through medium A of refractive index 1.50, enters medium B of refractive index 1.33 and finally enters medium C of refractive index 2.42. If this ray emerges out in air from C, then for which of the following pairs of media the bending of light is least?

Ans: A-B

Que 21: Which of the following statements is now true for scattering of light?

Ans: Scattering of light takes place as various colours of white light travel with different speed in air.

Que 22: Diagram- For the diagram shown, according to the new Cartesian sigh convention the magnification of the image formed will have the following specifications:

Ans: Sign-Positive, Value- More than 1

Que 23: A ray of light is incident as shown, If A, B and C are three different transparent media, then which among the following options is true for the given diagram?

Ans: Angle 3=Angle 2

Que 24: In the diagram given below, X and Y are the end colours of the spectrum of white light. The colour of Y represents the:

Ans: Colour used to paint the danger signals.

Section B

Que 25: Which one of the following reactions is categorised as thermal decomposition reaction?

Ans: CaCO3(s)- CaO(s)+ CO2(g)

Que 26: Consider the pH value of the following acidic samples.

Ans: 2>1>4>3

Que 27: Study the experimental set up shown in given figure and choose the correct option from the following:

Ans: K2CO3-P, Q- CO2 gas.  Turns milky

Que 28: Which one of the following structures correctly depicts the compound CaCl2?

Ans: Ca2+ [Cl]2

Que 29: The pair(s) which will show displacement reaction is/are

Ans: AgnO3 solution and copper metal and Al2(SO4)3 solution and magnesium metal.

Que 30: Which of the following salts do not have the water of crystalisation?

Ans: Bleaching Powder and Baking Soda

Que 31: Assertion: Sodium hydrogen carbonate is used as an ingredient in antacids.

R: NaHCO3 is a mild non-corrosive basic salt.

Ans: Both A and R are true and R is the correct explanation of A.

Que 32: Assertion: Burning of Natural gas is an endothermic process.

R: Methane gas combines with oxygen to produce carbon dioxide and water.

Ans: A is false, but R is true.

Que 33: A: Nitrigen is an essential element for plant growth and is

R: The soil is the nearest and richest source of raw materials.

Ans: Both A and R are true but R is now the correct explanation of A.

Que 34: A: Sun appears reddish at the time of sunrise and sunset.

R: Distance travelled by sunlight in the atmosphere is lesser during

Ans: A is true but R is false.

Que 35: A: Hydrochloric Acid helps in the digestion of food in the stomach.

R: Hydrochloric Acid creates an acidic medium to activate protein digestion enzymes.

Ans: Both A and R are true and R is the correct explanation of A.

Que 36: A students was asked to write a stepwise procedure to demonstrate that carbon dioxide is necessary for the photosynthesis . He wrote the following steps. The wrongly worded step is:

Ans: Both potted plants are kept in sunlight after the starch test.

Que 37: Respiratory structure of two different animals A fish and a human being are shown.

Observe a and b and select one characteristics that holds true for both of them.

Ans: Both have thin and moist surface for gaseous exchange.

Que 38: Observe the diagram of an activity given below. What does it help to conclude when the person exhales into the test tube.

Ans: Percentage of carbon dioxide is more in the exhaled air.

Que 39: If a lens can converge the sin rays at a point 20 cm away from its optical center the power of this lens is:

Ans: +5D

Que 40: The radius of curvature of a converging mirror is 30 cm. At what distance from the mirror should an object be placed so as to obtain a virtual image?

Ans: Between o cm and 15 cm.

Que 41: The length of small intestine in a deer is more as compared to the length of small intestine of a tiger. The reason for this is-

Ans: Type of food consumed

Que 42: Identify the two components of pholem tissue that helps in transportation of food in plants.

Ans: Sieve tubes & companion cells.

Que 43: A Converging lens forms a there times magnified image of an object, which can be take on a screen. If the focal length of the lens is 30 cm, then distance of the object from the lens is-

Ans: -40 Cm

Que 44: Which of the following statements is not true in reference to the diagram shown above?

Ans: Image formed is enlarged

Que 45: In the diagram shown above n1, n2, and n3 are refractive indices of the media 1, 2 and 3 respectively. Which one of the following is true in this case?

Ans: n3>n1

Que 46: The refractive index of medium A is 1.5 and that of medium B is 1.33. If the speed of light in air is 3*10^8 m/s, what is the speed of light in medium A and B respectively?

Ans: 2*10^8 m/s and 2.25* 10^8 m/s

Que 47: An object of height 4 cm is kept at a distance of 30 cm from the pole of a diverting mirror. if the focal length of the mirror is 10 cm, the height of the image formed is-

Ans: +1.0 cm

Que 48: 50.0 mL of tap water taken in a beaker. Hydrochloric acid was added drop drop to water. The temperature and pH of the solution was noted. The following graph was obtained. Choose the correct statements related to this activity.

Ans: The pH of the solution decreases rapidly on addition of acid and the pH of tap water was around 7.0.

Section C

Case-I: A student took four metals P, Q, R and S Carried out different experiments to study the properties of metals. Some of the observations were.

Que 49: Out of the given metal. the one which needs to be stored used Kerosene is:

Ans: R

Que 50: Out of the given metals, the metal is:

Ans: Magnesium

Que 51: Metal which forms amphoteric oxides is:

Ans: P

Que 52: The increasing order of the reactivity of the four metals is:

Ans: S<P<R<S

Case II: The figure shown below represents a common type of dialysis as….

Que 53: The haemodialyzer has semi-permeable lining tubes which help to:

Ans: To filter nitrogenous wastes from the dialyzing solution.

Que 54: Which one of the following is no a function of Artificial Kidney?

Ans: To reabsorb essential nutrients from the blood.

Que 55: The used dialysing solution is rich in:

Ans: Urea and excess salts

Que 56: Which part of the nephron in human kidney, serves the function of reabsorption of certain substances?

Ans: Tubules

Case III: A compound microscope is an instruments which….

Que 57: What types of lenses must be L1 and L2?

Ans: Both Convex

Que 58: What is the value and sign of magnification of the image formed by L1?

Ans: Value= More than 1 and Sign= Negative

Que 59: What is the value and sign of magnification of the image formed by L2?

Ans: Value= more than 1 and Sign= Positive

Que 60: If power of the eyepiece (L2) is 5 diopters and it forms an image at a distance of 80 cm from the optical center at what distance should the object is?

Ans: 16 cm

CBSE 10th Science Paper Solution- Section B Answers

In Section B of 10th Term 1 Science, there will 22 Questions. These Question Answers will be discussed here. So the students do not get confused with their Section Wise Answers, to avoid that we are going to provide CBSE 10th Term 1 Science Paper Answer Key for Section B in here.

Check CBSE 10th Term 1 Result 2021

CBSE 10th Nov-Dec Exam Science Paper Solution 2021

The Remaining two section of 10th Term 1 Science Question Paper will contain 14 Questions in it. These question solution are provided with correct Answers. Soon after the finishing the CBSE 10th Term 1 Science Paper students should head back to their homes. After having the lunch, students look for the CBSE 10th Term 1 Science Answer Key Set Wise. We are going to discuss the Every papers solutions here which has been given in the 10th Term  1 Science Paper. This article is continues updated for the CBSE 10th Term 1 Science Answer Key 2021, to provide in time information. If the students will have any query about CBSE 10th Term 1 Science Paper Solution they can ask in the comment section.

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