CBSE Class 10th Science model paper 2019 New Pattern. CBSE Board 10th Science Sample paper 2019. We are provide most important science questions for class 10th CBSE board.cbse board science guess paper 2019. Central Board of Secondary Education Science model/Sample paper 2019 pdf download.
CBSE Class 10th Science model paper 2019
- Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores?
- Write the principle of working of an electric motor?
- Write the name and structure of a saturated compound in which the carbon atoms are arranged in a ring. Give the number of single bonds present in this compound?
- Write the function of each of the following parts of human eye?
- Write the energy conversion that takes place in a hydro power plant?
- Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival – the one reproducing asexually or the one reproducing sexually ? Give reason to justify your answer.
- Why does the sun appear reddish early in the morning ? Will this phenomenon be observed by an astronaut on the Moon ? Give reason to justify your answer.
- Why do stars twinkle ? Explain.
- Why are most carbon compounds poor conductors of electricity?
- Why are metals good conductors of electricity whereas glass is a bad conductor of electricity ? Give reason.
- Why are alloys commonly used in electrical heating devices? Give reason.
- which three main problems should particularly be addressed to maintain peace among local people? Mention them.
CBSE Board 10th Science Sample paper 2019
- What is meant by power of a lens? Write its SI unit. A student uses a lens of focal length 40 cm and another of –20 cm. Write the nature and power of each lens.
- What is a dam ? Why do we seek to build large dams ? While building large dams, Thyroid (b) Pituitary (c) Pancreas
- The pH of a salt used to make tasty and crispy pakoras is 14. Identify the salt and write a chemical equation for its formation. List its two uses.
- The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation of all the three attempts.
- State the laws of refraction of light. Explain the term absolute refractive index of a medium and write an expression to relate it with the speed of light in vacuum.
State Modern periodic law.
State Fleming’s left hand rule.
- Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass?
- Name the hormones secreted by the following endocrine glands and specify one function of each?
- List the factors on which the resistance of a conductor in the shape of a wire depends?
- If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it? Draw a labelled ray diagram to support your answer.
- How is copper extracted from its sul-phide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper?
- Explain the function of the following parts of an electric motor.
Most important science questions for class 10th CBSE board.
- Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity.
- Cornea (ii) Iris (iii) Crystalline lens (iv) Ciliary muscles
- Armature (ii) Brushes (iii) Split ring
- A student is unable to see clearly the words written on the black board placed ata distance of approximately 3 m from him. Name the defect of vision the boy is suffering from. State the possible causes of this defect and explain the method of correcting it.
- A Mendel an experiment consisted of breeding pea plants bearing violet flowers with pea plants bearing white flowers. What will be the result in F1 progeny?
- A compound ‘X’ on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound ‘Y’. ‘X’ also reacts with sodium metal to evolve a colourless gas ‘Z’. Identify ‘X’, ‘Y’ and ‘Z’. Write the equation of the chemical reaction of formation of ‘Y’ and also write the role of sulphuric acid in the reaction.
- 2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube. When the contents are warmed, a gas evolves which is bubbled through a soap solution before testing. Write the equation of the chemical reactioninvolved and the test to detect the gas. Name the gas which will be evolved when the same metal reacts with dilute solution of a strong acid.