MAHASANKALPAM: CHITTOOR (DIST) Subject: Physical Science

(10,11 Units)

Spell –IV

Max. Marks:25

I. Answer all the questions 4×1=4M 1. Atomic numbers of elements A,B and C are 8, 10 and 13 respectively. Then which element forms positive and which element forms negative ions? (AS1) 2. To know difference between ionic and covalent bands pallavi asked some question to her friend. What are those questions? (AS2) 3. Fill the table (AS4) Element Hydrogen Helium Group number No. of valency electrons 4. Are the head lights of a car connected in series or parallel? Why? (AS2) II. Answer all the questions 5×2=10M 5. Predict the reason for low melting point for covalent compounds when compared with ionic compounds. (AS2) 6. Represent the following elements using Lewis notation. Berillum (Be), calcium (Ca), lithium (Li), hydrogen (H). 7. Draw a circuit diagram for a circuit in which two resistors R1 and R2 are connected in series with a battery and a voltmeter in connected to measure the potential difference across the resistors R 1. (AS5) 8. Write the material required to prove ohm‟s law. (AS3) 9. There are two parallel transmission lines on electric poles. The potential difference between these two lines is 240V. Throughout their lengths. When “monkey A” holding a high voltage wire with its hands and suspending in the air, “monkey B” by holding same wire and touching its legs to the wall of the building. Which monkey feels electric shock? Why? III. Answer all the questions 2×4=8M 10. A). Explain the formation of the N2 molecule using velency band theory (AS1) (OR) B). What is hybridization? Explain the formation of the BF3 (boron tri fluoride) using hybridization (AS1) 11. A). when R1=2Ω, R2=4Ω, R3=6Ω resistors are connected in series deduce the expression for the equivalent resistance for these three and find the equivalent resistance for these resistors. (AS1) (OR) B). write the material required to verify that resistance of a conductor is proportional to the length of the conductor for constant cross section area and temperature and explain the procedure (AS1) IV. Choose the correct answer 6× ½=3M 12. An element „A‟ forms chloride ACl4 the number of electrons in the valence shell of „A‟ [ ] a). 1 b). 2 c). 3 d). 4 13. Choose the correct answer from the information given in the table [ ] Molecule BeCl2 BF3 NH3 H2O Bond angle 180o 120o 107o481 104o311 Which is linear shape in the above molecules a). BeCl2 b). BF3 c). NH3 d). H2O 14. Which is correct structure [ ] A).

B).

C).

D). All are correct

15. Select the given V-I graph belongs to conductors which follows the Ohm‟s law at constant temperature

A).

B).

C).

16. Match the following i. electric current p). Ω -m ii. Potential difference q). Ohm iii. Electric resistance r). Volt iv. Specific resistance s). Ampere a). i-p ii-q iii-s iv-r b). i-r ii-s iii-q iv-p c). i-s ii-r iii-q iv-p 17. Which is correct statement. In electrical circuits i. always ammeter connected in series ii. Always ammeter connected in parallel iii. Always voltmeter connected in series iv. Always voltmeter connected in parallel a). I,ii b). I,iv c). ii, iv

D). all are correct

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d). i-s ii-q iii-r iv-p

d). I, ii, iii