Ssc Science Objectives

8/13/2019 Ssc Science Objectives

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SSC SCIENCE OBJECTIVES

School of elements.1. Which scientist stated the Law of Triad? (Dobereiner)2. Who introduced the Law of Octaves? (Newlands)3. What was Mendeleevs basis for the classification of

elements? (atomic mass)4. The unknown element of Mendeleevs periodic table,

EkaAluminium was later named as (gallium)5. How many elements are there in the 4thand 5thperiod

of modern periodic table? (18)6.

Halogens belongs to which group in Modern PeriodicTable? (seventeenth)

7. Which is the longest period in Modern Periodic table?(sixth)

8. What is the valency of first group elements? (one)9. Transition elements belong to which block in modern

periodic table? (d)10. Zero group elements exist in which physical state at

ordinary temperature? (gaseous)11. Which element has electronic configuration 2,8,2?

(Mg)12. The electronic configuration of element y is 2,7. What

is its valency?(one)13. What happens to atomic size of elements on moving

from left to right in a period?(decreases)14. What are normal elements? (s and p block elements)15. The element x belongs to group five. What is the

number of valence electrons in x? (five)16. In which period the element xbelongs, if its electronic

configuration is 2, 8, 1? (third)


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17. What is the valency of the element with atomic number17? (one)

18. Which block elements have last three shellsincompletely filled? (f)

19. Sulphur, carbon, iodine belongs to which block in

Modern periodic table? (p)20. Which element has twice as many electrons in its

second shell as its first shell? (carbon)21. A, B and C are the elements of Dobereners triad. If the

atomic mass of A is 40 and that of C is 137. What wouldbe the atomic mass of B? (88.5)

22. The element A belongs to which group it is atomicnumber if 23? (fifth group)

The Magic of Chemical Reactions1. What happens when silver chloride is exposed to

sunlight?(silver metal is formed)2. What is the chemical formula of Plaster of Paris

(POP)? (CaSO4. H2O)3. What happens during reduction reaction? (reactantsgain hydrogen)4. What is called the addition of oxygen to a substance?

(oxidation reaction)5. What is the odour of H2S gas? (rotten egg)6. What type of chemical reaction take place when

magnesium wire is burnt in air? (combination reaction)7. What type of chemical reaction takes place when lime

stone is heated? (decomposition reaction)8. How are food products containing fats and oils are

packaged in order to prevent from spoilage? (nitrogen)


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9. When soap is scrubbed on a white cloth, where ayellow stain of curry is present, it changes into reddishbrown. This is due to: (neutralization reaction)

10.

Silver ornaments become dark on prolonged exposureto air. This is due to the formation of layer of its. (sulphide)The acid base chemistry

1. The colour of universal indicator solution is: (greenishyellow)

2. The substance which is bitter to taste is: (an alkali)3. A student measured the PH values of four solutions

marked A, B, C and D found them to be 6, 12, 2 and 14

respectively. The solution which is likely to be stronglyacidic is: (C)

4. What is the pH value of neutral solution? (7)5. What colour change takes place when phenolphthalein

is added to NaOH solution? (pink)6. What is the taste of acidic substances? (sour)7. Acids turn blue litmus into: (red)8. What is litmus paper? (natural indicator)9. What do all acids contain? (hydrogen)10. Give the chemical formula for baking soda. (NaHCO3)11. What is the common name for sodium hydrogen

carbonate? (Baking soda)12. Which salt is used to disinfect water? (bleaching

power)13. A solution in test tube A has pH less than seven, which

kind of solution it is? (acidic)14. Which colour does the methyl orange indicator give in

basic solution?(yellow colour)15. Name the plant from which Litmus solution is extracted.

(Lichen)


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16. Which salt is used to reduce acidity in stomach?(baking soda)

17. Which salt is used in manufacturing paper? (sodiumcarbonate)

18. Name the salt which makes hard water soft? (Na2CO3)19. Which salt is used in fire extinguisher? (NaHCO3)20. The carboxylic acid present in milk is: (Lactic acid)21. What is milk of magnesia? (magnesium hydroxide)

The electric spark1. When current is plotted against potential difference, a

straight line plot is obtained, which of the following law is

verified? (Ohms law)2. When the resistance of the conductor increases then

the current will: (decrease)3. Keeping the potential difference constant the

resistance of the circuit is made four times. How muchdoes the current change? (becomes one fourth)

4. If the resistance is to be increased then the number ofresistances should be connected in: (series)

5. What is the equivalent resistance of three resistancesof 2 ohms, 3 ohms and 4 ohms are connected in series?(9 ohms)

6. In series combination which remains constant?(current)

7. You are given three equal resistances, in how manycombinations can they be arranged? (four)

8. Which instrument is used to measure electric current?(ammeter)

9. Which instrument is used to measure potentialdifference? (voltmeter)

10. Which physical quantity has the unit ohm? (resistance)


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11. Which combination is used to decrease resistance inthe circuit? (Parallel)

12. How would the three resistance of 3 ohms each beconnected so as to produce an equivalent resistance of 1ohm. (all in parallel)

13. If we want to connect a large number of electric bulbsfor decorating buildings which circuit is better? (series)

14. Keeping the potential difference constant, theresistance of the circuit is doubled. By how much does thecurrent change? (half)

15. Which particles constitute the electric current in ametallic conductor? (electrons)

16. What is the SI unit of electric charge? (coulomb)17. What is the SI unit of electric current? (Ampere)18. Who invented battery? (Alessandro Volta)19. Which metal has lowest resistivity? (silver)

20. What is the commercial unit of electrical energy?(kilowatthour)21. By what other name is the unit Joules / Coulombcalled? (volt)22. What is the SI unit of resistivity? (ohmmetre)23. Which of the following is a best conductor ofelectricity? (silver)24. Which is the allow of Cu and Ni? (constantan)25. Which material is used to make filament of anelectric bulb? (tungsten)

26. Which device work on the principle of heating effectof electric current. (fuse)27. Which substance has infinitely high resistance?(rubber)28. What is the resistivity of silver? (1.60 x 10 8 ohm m)


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29. How is electric power calculated? (electric power =potential difference x current)30. What material is used in electric iron as a heatingelement? (nichrome)

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