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Class X 10 ONE Mark Biology Questions: Do you know the Answers?



 LIFE PROCESSES

Q1.      Name the green dot like structures in some cells observed by a student when a leaf peel was viewed under a microscope.  What is this green colour due to?

Q2.      State the basic difference between the process of respiration and photosynthesis.

Q3.      Name the intermediate and the end products of glucose breakdown in aerobic respiration.

Q4.      Why are bacteria and fungi called decomposers?

Q5.      Mention any one point of difference between Pepsin and Trypsin.

CONTROL AND COORDINATION

Q6.      What will happen to a plant if its xylem is removed?

Q7.      Name two tissues that provide control and coordination in multicellular animals.

Q8.      How is the spinal cord protected in the human body?

Q9.      Name any two types of tropism.

Q10.    Name one plant growth hormone which retards growth during extremely dry season.

Q11.    Name the information source for making proteins in the cells.

HOW DO ORGANISMS REPRODUCE

Q12.    List two functions performed by the testis in human beings.

Q13.    Give reason for the statement- Since the ovary releases one egg every month, the uterus also prepares itself every month by making its lining thick and spongy.

Q14.    Name the method by which Plasmodium reproduces. Is this method sexual or asexual?

Q15.    Give an example of a flower which contains both stamens and carpels.

HEREDITY AND EVOLUTION

Q16.    Why is variation beneficial for the species, but not necessarily for the individual?

X_Biology_1 Marks_Answers

Class X 10 ONE Mark Chemistry Questions: Do you know the Answers?

CHEMICAL REACTIONS

Q1.   Balance the following chemical equation:

 Pb(NO3)2(s) ─heat→ PbO(s) + NO2 (g) + O2 (g)

Q2.  Write a balanced chemical equation for the reaction between sodium carbonate and hydrochloric acid indicating the physical state of the reactants and the products.

Q3.  Name a reducing agent that may be used to obtain manganese from manganese dioxide.

Q4.  Why do potato chips manufacturers fill the packet of chips with nitrogen gas?

Q5.  What is the valency of silicon with atomic number 14?

ACIDS, BASES AND SALTS

Q6.  Fresh milk has a pH of 6.  When it changes into curd (yoghurt) will its pH value increase or decrease? Why?

Q7.  During the summer season, a milkman usually adds a very small amount of baking soda to fresh milk. Give one reason.

Q8.  A drop of litmus solution is added to each of the four solutions given below.  State the colour of litmus solution observed in each: soap solution, sodium carbonate solution, vinegar, lemon juice.

METALS & NON-METALS

Q9.  The surface of some metals loses their brightness when kept in air for a long time. Why?

Q10. What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes?

Q11. Metals generally occur in the solid state. Name and write symbol of a metal that exists in a liquid state at room temperature.

Q12. Write a balanced chemical equation to represent the following reaction:  Iron reacts with stream to form Iron (II, III) oxide with hydrogen gas.

CARBON COMPOUNDS

Q13. State two characteristic features of carbon which when put together give rise to a large number of carbon compounds.

Q14. Write the structural formula of chloroethane.

Q15. Draw the electron-dot structure of ethane molecule (C2H6).

Q16. Write the number of horizontal rows in the modern periodic table.  What are these rows called?

Q17. Write the name and formula of the 2nd member of homologous series having general formula CnH2n.

Q18. Name the process of converting vegetable oil to vegetable ghee.

Q19. Write the molecular formula of (i) Methane and (ii) Ethanol.

Q20. Write the name of the first two members of homologous series having a functional group –OH.

Q21. Butanone is a four-carbon per molecule compound. Note the functional group present in it.

PERIODIC CLASSIFICATION OF ELEMENTS

Q22. State Modern Periodic Law of classification of elements.

Q23. The atomic number of sodium is 11, fluorine is 9 and neon is 10.  Why are sodium and fluorine very reactive while neon shows almost no reactivity.

X_Chemistry_1 Mark_Answers

Class X 10 ONE Mark Physics Questions: Do you know the Answers?

REFLECTION

Q1:  Explain why a ray of light passing through the centre of curvature of a concave mirror gets reflected along the same path.

Q2:  What is the nature of image formed by a concave mirror if the magnification produced by the mirror is +3?

Q3:  Write two different uses of concave mirrors.

Q4:  An object is kept at a distance of 4m in front of a special mirror which forms its erect image at a distance of 1.0 m from the mirror. What is the magnification? Is the mirror concave or convex?

Q5:  A ray of light LM is incident on a mirror as shown in the figure. The angle of incidence for this ray is the angle between it and the line joining two other points in the figure. Name these two points.

Q05

REFRACTION

Q6:  Why does a ray of light bend when it travels from one medium into another?

Q7:  Name the component of white light that has the greatest wavelength.

Q8:  How should a ray of light be incident on a rectangular glass slab so that it comes out from the opposite side of the slab without being displaced?

Q9:  The following table gives the values of refractive indices of few media.

S.No. 1 2 3 4 5
Medium Water Crown Glass Rock Salt Ruby Diamond
Refractive Index 1.33 1.52 1.54 1.71 2.42

Use this table to give an example of a medium pair so that light speeds up when it goes from one of these media to another.

Q10:  Draw the given diagram in your answer book and complete it for the path of ray of light beyond the lens.

Q10MOD

Q11:  A girl was playing with a thin beam of light from her laser torch by direction it from different directions on a convex lens held vertically.  She was surprised to see that in a particular direction the beam of light continues to move along the same direction through the lens.  State the reason for this observation.

Q12:  Define power of a lens.

HUMAN EYE

Q13:  Name the part of our eyes that helps us to focus near and distant objects in quick succession.

NATURAL PHENOMENA

Q14:  Why does sky look blue on a clear day?

Q15:  List the three phenomena of light responsible for formation of rainbow in the sky?

Q16:  Why do we see stars twinkling whereas, planets do not twinkle?

ELECTRICITY

Q17:  Generally, alloys are used in electrical heating devices instead of pure metals. What could be the reason?

MAGNETISM

Q18:  A charged particle enters at right angles into a uniform magnetic field as shown.  What should be the nature of charge on the particle if it begins to move in a direction pointing vertically out of the page due to its interaction with the magnetic field?

Q18

Physics-1-mark-q-n-a

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Class XII Physics: MARKING SCHEME FOR CBSE BOARD EXAMINATION 2018

PHYSICS

FIRST – There will be a total of 26 QUESTIONS in the Physics Paper of 70 Marks

SECOND – All the 26 Questions are compulsory.

THIRD The Physics Question Paper is divided into five Sections. Section A, Section B, Section C, Section D and Section E.

FOURTH 

Section A: 5 Questions each of 1 – mark totalling 5 marks

Section B: 5 Questions each of 2 – mark totalling 10 marks

(Choice available in one Question)

Section C: 12 Questions each of 3 – mark totalling 36 marks

(Choice available in one Question)

Section D: 1 Value Added Question of 4 – mark totalling 4 marks

Section E: 3 Questions each of 4 – mark totalling 15 marks

(in all 3 Questions have Choice)

 

2018 Class XII Physics Sample Paper

2018 Class XII Physics marking Scheme

CLASS X: Datesheet

The date sheet is good. Exam starts at 10.30 A.M. on exam days

Science is on Friday, the 16th March, 2018.

You have three free days as English is on Monday, the 12th March, 2018.

The date sheet is like this:

  1. Tuesday, 6th March, 2018 – HINDI

—————— 5 days gap——————————

  1. Monday, 12th March, 2018 – ENGLISH

—————— 3 days gap——————————

  1. Friday, 16th March, 2018 – SCIENCE

—————— 5 days gap——————————

  1. Thursday, 22nd March 2018 – SOCIAL SCIENCE

—————— 5 days gap——————————

  1. Wednesday, 28th March, 2018 – MATHEMATICS

You can download the complete date sheet here.

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