Board Paper of Class 10 2016 Physics - Solutions

• Question 16
  Here are certain important hereditary jargons. Fill in the blanks by choosing a suitable one from the list given. (allele, variation, speciation, gene, allelomorphs)
  
  (i) ____________ are the factors which form the physical basis of inheritance.
  
  (ii) ____________ is the alternate form of the same gene. VIEW SOLUTION

• Question 17
  What are variations? Mention their types. VIEW SOLUTION

• Question 19
  What are the symptoms of common cold?
  
  (i) ______________.
  
  (ii) ______________. VIEW SOLUTION

• Question 20
  Pick out the item which has sequential arrangement.
  
  (i) Zygotene → Leptotene → Pachytene → Diplotene → Diakinesis.
  
  (ii) Diakinesis → Zygotene → Leptotene → Pachytene → Diplotene.
  
  (iii) Leptotene → Zygotene → Pachytene → Diplotene → Diakinesis VIEW SOLUTION

• Question 21
  (a) Identify figure A and B.
  
  (b) Which part of A is modified into B.
  
  
  VIEW SOLUTION

• Question 22
  Assertion (A) : Mammalian heart is called myogenic heart.
  
  Reason (R) : Heart-beat is regulated by a specialized muscle bundle (pacemaker) in mammals.
  
  (a) Both (A) and (R) are true and (R) explains(A).
  
  (b) Both (A) and (R) are true but (R) doesn't explain (A).
  
  (c) (A) is true but (R) is false.
  
  (d) (A) is false but (R) is true. VIEW SOLUTION

• Question 23
  Name the three important blood proteins seen in Plasma. Add a note on their functions. VIEW SOLUTION

• Question 24
  The master chemists of our body are he kidneys. Justify.
  
  (a) Kidneys filter all chemicals in the body.
  
  (b) Kidneys maintain the chemical composition of blood.
  
  (c) Kidneys eliminate all chemicals absorbed by the body.
  
  (d) Kidneys store the chemicals accumulated in the body. VIEW SOLUTION

• Question 25
  Match the methods of nutrition of special organs with suitable examples:
   

  Autotrophs	Mycorrhiza	Cuscutta
  Parasites	Chlorophyll	Monotropa
  Saprophytes	Haustoria	Hibiscus

  VIEW SOLUTION

• Question 26
  Observe the diagram.
  
  
  
  
  (i) Mention the type of movements shown in figure A and B.
  
  (ii) How does this movement differ from the movement of mimosa ? VIEW SOLUTION

• Question 27
  What is respiration? Give a balanced equation for aerobic respiration. VIEW SOLUTION

• Question 28
  Depict a food chain by placing the following organisms in the correct trophic levels.
  
  (snake, grass, eagle, frog, grasshopper) VIEW SOLUTION

• Question 29
  Find the odd one out:
  
  (a) bio-alcohol, green diesel, bio-ethers, petroleum.
  
  (b) cholera, typhoid, scabies, dysentry. VIEW SOLUTION

• Question 30
  Substituting energy efficient Compact Fluorescent Light bulbs (CFL) for standard incandescent bulbs will save on an average upto 6,000 megawatts of electricity each year.
  
  Raise questions:
  
  (a) ____________?
  
  (b) ____________? VIEW SOLUTION

• Question 31
  Write any four liquid bio-fuels for transportation. VIEW SOLUTION

• Question 32
  (a) Which gas is dissolved in soft drinks?
  
  (b) What will you do to increase the solubility of this  gas? VIEW SOLUTION

• Question 33
  What is Tyndall Effect? VIEW SOLUTION

• Question 34
  Calculate the number of molecules in 11 g of CO₂. VIEW SOLUTION

• Question 35
  Identify the wrong statements and correct them.
  
  (a) Sodium benzoate is used in food preservative.
  
  (b) Nitric acid is not used as fertilizer in agriculture.
  
  (c) Sulphuric acid is called the king of chemicals.
  
  (d) The pH of acid is greater than 7. VIEW SOLUTION

• Question 36
  The hydrogen ion concentration of a solution is 0.001 M.  What is the pH of the solution? VIEW SOLUTION

• Question 37
  Correct the mistakes, if any in the following statement.
  
  In a period,the metallic character of the element increases while their non metallic character decreases. VIEW SOLUTION

• Question 38
  Assertion (A) : Electroplating method not only protects but also enhances the metallic appearance.
  
  Reason (R) : Electroplating is a method of coating one metal with another by passing electric current.
  
  (a) (A) is right, (R) is wrong.
  
  (b) (A) is right, (R) is not relevant.
  
  (c) (A) is right, (R) is relevant. VIEW SOLUTION

• Question 39
  Diamond is the hardest allotrope of carbon. Give reason for its hardness. VIEW SOLUTION

• Question 40
  Assertion (A) : Liquefied cryogenic gases are sprayed on underground electric cables in big cities.
  
  Reason (R) : Liquefied cryogenic gases prevent wastage of power.
  
  (a) (A) is incorrect and (R) is correct.
  
  (b) (A) is correct and (R) is incorrect.
  
  (c) Both (A) and (R) are incorrect.
  
  (d) (A) is correct and (R) supports (A). VIEW SOLUTION

• Question 41
  As a matter of convention, an anticlockwise moment is taken as ____________ and a clockwise moment is taken as ____________. VIEW SOLUTION

• Question 42
  Match the following:
   

  (1)	Potential difference	(a)	Coulomb
  (2)	Current	(b)	Volt
  (3)	Electric Charge	(c)	Ohm
  (4)	Resistor	(d)	Newton
  		(e)	Ampere

  VIEW SOLUTION

• Question 43
  Fuse wire is made up of an alloy of ____________ which has high resistance and _____________ melting point. VIEW SOLUTION

• Question 44
  In the list of sources of energy given below, find out the odd one.
  
  (Solar energy, Thermal energy, Hydropower, Biomass) VIEW SOLUTION

• Question 45
  The focal length of a concave lens is 2 m. Calculate the power of the lens. VIEW SOLUTION

• Question 46
  Define Fleming's left hand Rule. VIEW SOLUTION

• Question 47

  Observe the diagram and fill up the following:
  
  (a) _____________ defect of eye.
  
  (b) _____________  lens is used to correct the defect.
   

  

  VIEW SOLUTION

• Question 48
  Kala has delivered a baby.
  
  (a) Suggest the immunization schedule for the baby, in the first six months.
  
  (b) What are the diseases that can be cured as per the schedule? VIEW SOLUTION

• Question 49
  Describe the structure of a neuron with the help of a neat, labelled diagram. VIEW SOLUTION

• Question 50
  (a) Fruit is the product of fertilization. Is there any fruit which is formed without the act of fertilization?
  
  (b) Represent the classification of fruits in a diagrammatic sketch. VIEW SOLUTION

• Question 51
  List out the harmful effects of burning coal. VIEW SOLUTION

• Question 52
  (a) What are Isotopes?
  
  (b) Write any three applications of Avogadro's law? VIEW SOLUTION

• Question 53
  What are the evil effects of consuming alcohol? VIEW SOLUTION

• Question 54
  Write any five achievements of Chandrayaan – I. VIEW SOLUTION

• Question 55
  
  
  (a) Redraw the diagram.
  
  (b) This diagram represents ____________.
  
  (c) Label the parts of the diagram.
  
  (d) Mention the principle used in the device denoted by this diagram. VIEW SOLUTION